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nuttx/arch/arm/src/stm32/stm32_serial.c

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/****************************************************************************
* arch/arm/src/stm32/stm32_serial.c
*
* Copyright (C) 2009-2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <semaphore.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial/serial.h>
#include <nuttx/power/pm.h>
#ifdef CONFIG_SERIAL_TERMIOS
# include <termios.h>
#endif
#include <arch/serial.h>
#include <arch/board/board.h>
#include "chip.h"
#include "stm32_uart.h"
#include "stm32_dma.h"
#include "stm32_rcc.h"
#include "up_arch.h"
#include "up_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Some sanity checks *******************************************************/
/* DMA configuration */
/* If DMA is enabled on any USART, then very that other pre-requisites
* have also been selected.
*/
#ifdef SERIAL_HAVE_DMA
# if defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX)
/* Verify that DMA has been enabled and the DMA channel has been defined.
*/
# if defined(CONFIG_USART1_RXDMA) || defined(CONFIG_USART6_RXDMA)
# ifndef CONFIG_STM32_DMA2
# error STM32 USART1/6 receive DMA requires CONFIG_STM32_DMA2
# endif
# endif
# if defined(CONFIG_USART2_RXDMA) || defined(CONFIG_USART3_RXDMA) || \
defined(CONFIG_UART4_RXDMA) || defined(CONFIG_UART5_RXDMA) || \
defined(CONFIG_UART7_RXDMA) || defined(CONFIG_UART8_RXDMA)
# ifndef CONFIG_STM32_DMA1
# error STM32 USART2/3/4/5/7/8 receive DMA requires CONFIG_STM32_DMA1
# endif
# endif
/* Currently RS-485 support cannot be enabled when RXDMA is in use due to lack
* of testing - RS-485 support was developed on STM32F1x
*/
# if (defined(CONFIG_USART1_RXDMA) && defined(CONFIG_USART1_RS485)) || \
(defined(CONFIG_USART2_RXDMA) && defined(CONFIG_USART2_RS485)) || \
(defined(CONFIG_USART3_RXDMA) && defined(CONFIG_USART3_RS485)) || \
(defined(CONFIG_UART4_RXDMA) && defined(CONFIG_UART4_RS485)) || \
(defined(CONFIG_UART5_RXDMA) && defined(CONFIG_UART5_RS485)) || \
(defined(CONFIG_USART6_RXDMA) && defined(CONFIG_USART6_RS485)) || \
(defined(CONFIG_UART7_RXDMA) && defined(CONFIG_UART7_RS485)) || \
(defined(CONFIG_UART8_RXDMA) && defined(CONFIG_UART8_RS485))
# error "RXDMA and RS-485 cannot be enabled at the same time for the same U[S]ART"
# endif
/* For the F4, there are alternate DMA channels for USART1 and 6.
* Logic in the board.h file make the DMA channel selection by defining
* the following in the board.h file.
*/
# if defined(CONFIG_USART1_RXDMA) && !defined(DMAMAP_USART1_RX)
# error "USART1 DMA channel not defined (DMAMAP_USART1_RX)"
# endif
# if defined(CONFIG_USART2_RXDMA) && !defined(DMAMAP_USART2_RX)
# error "USART2 DMA channel not defined (DMAMAP_USART2_RX)"
# endif
# if defined(CONFIG_USART3_RXDMA) && !defined(DMAMAP_USART3_RX)
# error "USART3 DMA channel not defined (DMAMAP_USART3_RX)"
# endif
# if defined(CONFIG_UART4_RXDMA) && !defined(DMAMAP_UART4_RX)
# error "UART4 DMA channel not defined (DMAMAP_UART4_RX)"
# endif
# if defined(CONFIG_UART5_RXDMA) && !defined(DMAMAP_UART5_RX)
# error "UART5 DMA channel not defined (DMAMAP_UART5_RX)"
# endif
# if defined(CONFIG_USART6_RXDMA) && !defined(DMAMAP_USART6_RX)
# error "USART6 DMA channel not defined (DMAMAP_USART6_RX)"
# endif
# if defined(CONFIG_UART7_RXDMA) && !defined(DMAMAP_UART7_RX)
# error "UART7 DMA channel not defined (DMAMAP_UART7_RX)"
# endif
# if defined(CONFIG_UART8_RXDMA) && !defined(DMAMAP_UART8_RX)
# error "UART8 DMA channel not defined (DMAMAP_UART8_RX)"
# endif
# elif defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F10XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F30XX)
# if defined(CONFIG_USART1_RXDMA) || defined(CONFIG_USART2_RXDMA) || \
defined(CONFIG_USART3_RXDMA)
# ifndef CONFIG_STM32_DMA1
# error STM32 USART1/2/3 receive DMA requires CONFIG_STM32_DMA1
# endif
# endif
# if defined(CONFIG_UART4_RXDMA) || defined(CONFIG_UART5_RXDMA)
# ifndef CONFIG_STM32_DMA2
# error STM32 UART4/5 receive DMA requires CONFIG_STM32_DMA2
# endif
# endif
/* There are no optional DMA channel assignments for the F1 */
# define DMAMAP_USART1_RX DMACHAN_USART1_RX
# define DMAMAP_USART2_RX DMACHAN_USART2_RX
# define DMAMAP_USART3_RX DMACHAN_USART3_RX
# define DMAMAP_UART4_RX DMACHAN_UART4_RX
# define DMAMAP_UART5_RX DMACHAN_UART5_RX
# endif
/* The DMA buffer size when using RX DMA to emulate a FIFO.
*
* When streaming data, the generic serial layer will be called
* every time the FIFO receives half this number of bytes.
*/
# define RXDMA_BUFFER_SIZE 32
/* DMA priority */
# ifndef CONFIG_USART_DMAPRIO
# if defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F10XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F37XX)
# define CONFIG_USART_DMAPRIO DMA_CCR_PRIMED
# elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX)
# define CONFIG_USART_DMAPRIO DMA_SCR_PRIMED
# else
# error "Unknown STM32 DMA"
# endif
# endif
# if defined(CONFIG_STM32_STM32L15XX) || defined(CONFIG_STM32_STM32F10XX) || \
defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F37XX)
# if (CONFIG_USART_DMAPRIO & ~DMA_CCR_PL_MASK) != 0
# error "Illegal value for CONFIG_USART_DMAPRIO"
# endif
# elif defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX)
# if (CONFIG_USART_DMAPRIO & ~DMA_SCR_PL_MASK) != 0
# error "Illegal value for CONFIG_USART_DMAPRIO"
# endif
# else
# error "Unknown STM32 DMA"
# endif
/* DMA control words */
# if defined(CONFIG_STM32_STM32F20XX) || defined(CONFIG_STM32_STM32F40XX)
# define SERIAL_DMA_CONTROL_WORD \
(DMA_SCR_DIR_P2M | \
DMA_SCR_CIRC | \
DMA_SCR_MINC | \
DMA_SCR_PSIZE_8BITS | \
DMA_SCR_MSIZE_8BITS | \
CONFIG_USART_DMAPRIO | \
DMA_SCR_PBURST_SINGLE | \
DMA_SCR_MBURST_SINGLE)
# ifdef CONFIG_SERIAL_IFLOWCONTROL
# define SERIAL_DMA_IFLOW_CONTROL_WORD \
(DMA_SCR_DIR_P2M | \
DMA_SCR_MINC | \
DMA_SCR_PSIZE_8BITS | \
DMA_SCR_MSIZE_8BITS | \
CONFIG_USART_DMAPRIO | \
DMA_SCR_PBURST_SINGLE | \
DMA_SCR_MBURST_SINGLE)
# endif
# else
# define SERIAL_DMA_CONTROL_WORD \
(DMA_CCR_CIRC | \
DMA_CCR_MINC | \
DMA_CCR_PSIZE_8BITS | \
DMA_CCR_MSIZE_8BITS | \
CONFIG_USART_DMAPRIO)
# ifdef CONFIG_SERIAL_IFLOWCONTROL
# define SERIAL_DMA_IFLOW_CONTROL_WORD \
(DMA_CCR_MINC | \
DMA_CCR_PSIZE_8BITS | \
DMA_CCR_MSIZE_8BITS | \
CONFIG_USART_DMAPRIO)
# endif
# endif
#endif
/* Power management definitions */
#if defined(CONFIG_PM) && !defined(CONFIG_PM_SERIAL_ACTIVITY)
# define CONFIG_PM_SERIAL_ACTIVITY 10
#endif
#ifdef USE_SERIALDRIVER
#ifdef HAVE_UART
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
struct uart_dev_s dev; /* Generic UART device */
uint16_t ie; /* Saved interrupt mask bits value */
uint16_t sr; /* Saved status bits */
/* If termios are supported, then the following fields may vary at
* runtime.
*/
#ifdef CONFIG_SERIAL_TERMIOS
uint8_t parity; /* 0=none, 1=odd, 2=even */
uint8_t bits; /* Number of bits (7 or 8) */
bool stopbits2; /* True: Configure with 2 stop bits instead of 1 */
#ifdef CONFIG_SERIAL_IFLOWCONTROL
bool iflow; /* input flow control (RTS) enabled */
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
bool oflow; /* output flow control (CTS) enabled */
#endif
uint32_t baud; /* Configured baud */
#else
const uint8_t parity; /* 0=none, 1=odd, 2=even */
const uint8_t bits; /* Number of bits (7 or 8) */
const bool stopbits2; /* True: Configure with 2 stop bits instead of 1 */
#ifdef CONFIG_SERIAL_IFLOWCONTROL
const bool iflow; /* input flow control (RTS) enabled */
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
const bool oflow; /* output flow control (CTS) enabled */
#endif
const uint32_t baud; /* Configured baud */
#endif
const uint8_t irq; /* IRQ associated with this USART */
const uint32_t apbclock; /* PCLK 1 or 2 frequency */
const uint32_t usartbase; /* Base address of USART registers */
const uint32_t tx_gpio; /* U[S]ART TX GPIO pin configuration */
const uint32_t rx_gpio; /* U[S]ART RX GPIO pin configuration */
#ifdef CONFIG_SERIAL_IFLOWCONTROL
const uint32_t rts_gpio; /* U[S]ART RTS GPIO pin configuration */
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
const uint32_t cts_gpio; /* U[S]ART CTS GPIO pin configuration */
#endif
#ifdef SERIAL_HAVE_DMA
const unsigned int rxdma_channel; /* DMA channel assigned */
#endif
int (* const vector)(int irq, void *context); /* Interrupt handler */
/* RX DMA state */
#ifdef SERIAL_HAVE_DMA
DMA_HANDLE rxdma; /* currently-open receive DMA stream */
bool rxenable; /* DMA-based reception en/disable */
uint32_t rxdmanext; /* Next byte in the DMA buffer to be read */
char *const rxfifo; /* Receive DMA buffer */
#endif
#ifdef HAVE_RS485
const uint32_t rs485_dir_gpio; /* U[S]ART RS-485 DIR GPIO pin configuration */
const bool rs485_dir_polarity; /* U[S]ART RS-485 DIR pin state for TX enabled */
#endif
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void up_set_format(struct uart_dev_s *dev);
static int up_setup(struct uart_dev_s *dev);
static void up_shutdown(struct uart_dev_s *dev);
static int up_attach(struct uart_dev_s *dev);
static void up_detach(struct uart_dev_s *dev);
static int up_interrupt_common(struct up_dev_s *dev);
static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
#ifndef SERIAL_HAVE_ONLY_DMA
static int up_receive(struct uart_dev_s *dev, unsigned int *status);
static void up_rxint(struct uart_dev_s *dev, bool enable);
static bool up_rxavailable(struct uart_dev_s *dev);
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool up_rxflowcontrol(struct uart_dev_s *dev, unsigned int nbuffered,
bool upper);
#endif
static void up_send(struct uart_dev_s *dev, int ch);
static void up_txint(struct uart_dev_s *dev, bool enable);
static bool up_txready(struct uart_dev_s *dev);
#ifdef SERIAL_HAVE_DMA
static int up_dma_setup(struct uart_dev_s *dev);
static void up_dma_shutdown(struct uart_dev_s *dev);
static int up_dma_receive(struct uart_dev_s *dev, unsigned int *status);
static void up_dma_rxint(struct uart_dev_s *dev, bool enable);
static bool up_dma_rxavailable(struct uart_dev_s *dev);
static void up_dma_rxcallback(DMA_HANDLE handle, uint8_t status, void *arg);
#endif
#ifdef CONFIG_PM
static void up_pm_notify(struct pm_callback_s *cb, enum pm_state_e pmstate);
static int up_pm_prepare(struct pm_callback_s *cb, enum pm_state_e pmstate);
#endif
#ifdef CONFIG_STM32_USART1
static int up_interrupt_usart1(int irq, void *context);
#endif
#ifdef CONFIG_STM32_USART2
static int up_interrupt_usart2(int irq, void *context);
#endif
#ifdef CONFIG_STM32_USART3
static int up_interrupt_usart3(int irq, void *context);
#endif
#ifdef CONFIG_STM32_UART4
static int up_interrupt_uart4(int irq, void *context);
#endif
#ifdef CONFIG_STM32_UART5
static int up_interrupt_uart5(int irq, void *context);
#endif
#ifdef CONFIG_STM32_USART6
static int up_interrupt_usart6(int irq, void *context);
#endif
#ifdef CONFIG_STM32_UART7
static int up_interrupt_uart7(int irq, void *context);
#endif
#ifdef CONFIG_STM32_UART8
static int up_interrupt_uart8(int irq, void *context);
#endif
/****************************************************************************
* Private Variables
****************************************************************************/
#ifndef SERIAL_HAVE_ONLY_DMA
static const struct uart_ops_s g_uart_ops =
{
.setup = up_setup,
.shutdown = up_shutdown,
.attach = up_attach,
.detach = up_detach,
.ioctl = up_ioctl,
.receive = up_receive,
.rxint = up_rxint,
.rxavailable = up_rxavailable,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.rxflowcontrol = up_rxflowcontrol,
#endif
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txready,
};
#endif
#ifdef SERIAL_HAVE_DMA
static const struct uart_ops_s g_uart_dma_ops =
{
.setup = up_dma_setup,
.shutdown = up_dma_shutdown,
.attach = up_attach,
.detach = up_detach,
.ioctl = up_ioctl,
.receive = up_dma_receive,
.rxint = up_dma_rxint,
.rxavailable = up_dma_rxavailable,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.rxflowcontrol = up_rxflowcontrol,
#endif
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txready,
};
#endif
/* I/O buffers */
#ifdef CONFIG_STM32_USART1
static char g_usart1rxbuffer[CONFIG_USART1_RXBUFSIZE];
static char g_usart1txbuffer[CONFIG_USART1_TXBUFSIZE];
# ifdef CONFIG_USART1_RXDMA
static char g_usart1rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_USART2
static char g_usart2rxbuffer[CONFIG_USART2_RXBUFSIZE];
static char g_usart2txbuffer[CONFIG_USART2_TXBUFSIZE];
# ifdef CONFIG_USART2_RXDMA
static char g_usart2rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_USART3
static char g_usart3rxbuffer[CONFIG_USART3_RXBUFSIZE];
static char g_usart3txbuffer[CONFIG_USART3_TXBUFSIZE];
# ifdef CONFIG_USART3_RXDMA
static char g_usart3rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_UART4
static char g_uart4rxbuffer[CONFIG_UART4_RXBUFSIZE];
static char g_uart4txbuffer[CONFIG_UART4_TXBUFSIZE];
# ifdef CONFIG_UART4_RXDMA
static char g_uart4rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_UART5
static char g_uart5rxbuffer[CONFIG_UART5_RXBUFSIZE];
static char g_uart5txbuffer[CONFIG_UART5_TXBUFSIZE];
# ifdef CONFIG_UART5_RXDMA
static char g_uart5rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_USART6
static char g_usart6rxbuffer[CONFIG_USART6_RXBUFSIZE];
static char g_usart6txbuffer[CONFIG_USART6_TXBUFSIZE];
# ifdef CONFIG_USART6_RXDMA
static char g_usart6rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_UART7
static char g_uart7rxbuffer[CONFIG_UART7_RXBUFSIZE];
static char g_uart7txbuffer[CONFIG_UART7_TXBUFSIZE];
# ifdef CONFIG_UART7_RXDMA
static char g_uart7rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
#ifdef CONFIG_STM32_UART8
static char g_uart8rxbuffer[CONFIG_UART8_RXBUFSIZE];
static char g_uart8txbuffer[CONFIG_UART8_TXBUFSIZE];
# ifdef CONFIG_UART8_RXDMA
static char g_uart8rxfifo[RXDMA_BUFFER_SIZE];
# endif
#endif
/* This describes the state of the STM32 USART1 ports. */
#ifdef CONFIG_STM32_USART1
static struct up_dev_s g_usart1priv =
{
.dev =
{
#if CONSOLE_UART == 1
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_USART1_RXBUFSIZE,
.buffer = g_usart1rxbuffer,
},
.xmit =
{
.size = CONFIG_USART1_TXBUFSIZE,
.buffer = g_usart1txbuffer,
},
#ifdef CONFIG_USART1_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_usart1priv,
},
.irq = STM32_IRQ_USART1,
.parity = CONFIG_USART1_PARITY,
.bits = CONFIG_USART1_BITS,
.stopbits2 = CONFIG_USART1_2STOP,
.baud = CONFIG_USART1_BAUD,
.apbclock = STM32_PCLK2_FREQUENCY,
.usartbase = STM32_USART1_BASE,
.tx_gpio = GPIO_USART1_TX,
.rx_gpio = GPIO_USART1_RX,
#if defined(CONFIG_SERIAL_OFLOWCONTROL) && defined(CONFIG_USART1_OFLOWCONTROL)
.oflow = true,
.cts_gpio = GPIO_USART1_CTS,
#endif
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART1_IFLOWCONTROL)
.iflow = true,
.rts_gpio = GPIO_USART1_RTS,
#endif
#ifdef CONFIG_USART1_RXDMA
.rxdma_channel = DMAMAP_USART1_RX,
.rxfifo = g_usart1rxfifo,
#endif
.vector = up_interrupt_usart1,
#ifdef CONFIG_USART1_RS485
.rs485_dir_gpio = GPIO_USART1_RS485_DIR,
# if (CONFIG_USART1_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 USART2 port. */
#ifdef CONFIG_STM32_USART2
static struct up_dev_s g_usart2priv =
{
.dev =
{
#if CONSOLE_UART == 2
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_USART2_RXBUFSIZE,
.buffer = g_usart2rxbuffer,
},
.xmit =
{
.size = CONFIG_USART2_TXBUFSIZE,
.buffer = g_usart2txbuffer,
},
#ifdef CONFIG_USART2_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_usart2priv,
},
.irq = STM32_IRQ_USART2,
.parity = CONFIG_USART2_PARITY,
.bits = CONFIG_USART2_BITS,
.stopbits2 = CONFIG_USART2_2STOP,
.baud = CONFIG_USART2_BAUD,
.apbclock = STM32_PCLK1_FREQUENCY,
.usartbase = STM32_USART2_BASE,
.tx_gpio = GPIO_USART2_TX,
.rx_gpio = GPIO_USART2_RX,
#if defined(CONFIG_SERIAL_OFLOWCONTROL) && defined(CONFIG_USART2_OFLOWCONTROL)
.oflow = true,
.cts_gpio = GPIO_USART2_CTS,
#endif
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART2_IFLOWCONTROL)
.iflow = true,
.rts_gpio = GPIO_USART2_RTS,
#endif
#ifdef CONFIG_USART2_RXDMA
.rxdma_channel = DMAMAP_USART2_RX,
.rxfifo = g_usart2rxfifo,
#endif
.vector = up_interrupt_usart2,
#ifdef CONFIG_USART2_RS485
.rs485_dir_gpio = GPIO_USART2_RS485_DIR,
# if (CONFIG_USART2_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 USART3 port. */
#ifdef CONFIG_STM32_USART3
static struct up_dev_s g_usart3priv =
{
.dev =
{
#if CONSOLE_UART == 3
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_USART3_RXBUFSIZE,
.buffer = g_usart3rxbuffer,
},
.xmit =
{
.size = CONFIG_USART3_TXBUFSIZE,
.buffer = g_usart3txbuffer,
},
#ifdef CONFIG_USART3_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_usart3priv,
},
.irq = STM32_IRQ_USART3,
.parity = CONFIG_USART3_PARITY,
.bits = CONFIG_USART3_BITS,
.stopbits2 = CONFIG_USART3_2STOP,
.baud = CONFIG_USART3_BAUD,
.apbclock = STM32_PCLK1_FREQUENCY,
.usartbase = STM32_USART3_BASE,
.tx_gpio = GPIO_USART3_TX,
.rx_gpio = GPIO_USART3_RX,
#if defined(CONFIG_SERIAL_OFLOWCONTROL) && defined(CONFIG_USART3_OFLOWCONTROL)
.oflow = true,
.cts_gpio = GPIO_USART3_CTS,
#endif
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART3_IFLOWCONTROL)
.iflow = true,
.rts_gpio = GPIO_USART3_RTS,
#endif
#ifdef CONFIG_USART3_RXDMA
.rxdma_channel = DMAMAP_USART3_RX,
.rxfifo = g_usart3rxfifo,
#endif
.vector = up_interrupt_usart3,
#ifdef CONFIG_USART3_RS485
.rs485_dir_gpio = GPIO_USART3_RS485_DIR,
# if (CONFIG_USART3_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 UART4 port. */
#ifdef CONFIG_STM32_UART4
static struct up_dev_s g_uart4priv =
{
.dev =
{
#if CONSOLE_UART == 4
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_UART4_RXBUFSIZE,
.buffer = g_uart4rxbuffer,
},
.xmit =
{
.size = CONFIG_UART4_TXBUFSIZE,
.buffer = g_uart4txbuffer,
},
#ifdef CONFIG_UART4_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_uart4priv,
},
.irq = STM32_IRQ_UART4,
.parity = CONFIG_UART4_PARITY,
.bits = CONFIG_UART4_BITS,
.stopbits2 = CONFIG_UART4_2STOP,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.iflow = false,
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
.oflow = false,
#endif
.baud = CONFIG_UART4_BAUD,
.apbclock = STM32_PCLK1_FREQUENCY,
.usartbase = STM32_UART4_BASE,
.tx_gpio = GPIO_UART4_TX,
.rx_gpio = GPIO_UART4_RX,
#ifdef CONFIG_SERIAL_OFLOWCONTROL
.cts_gpio = 0,
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.rts_gpio = 0,
#endif
#ifdef CONFIG_UART4_RXDMA
.rxdma_channel = DMAMAP_UART4_RX,
.rxfifo = g_uart4rxfifo,
#endif
.vector = up_interrupt_uart4,
#ifdef CONFIG_UART4_RS485
.rs485_dir_gpio = GPIO_UART4_RS485_DIR,
# if (CONFIG_UART4_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 UART5 port. */
#ifdef CONFIG_STM32_UART5
static struct up_dev_s g_uart5priv =
{
.dev =
{
#if CONSOLE_UART == 5
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_UART5_RXBUFSIZE,
.buffer = g_uart5rxbuffer,
},
.xmit =
{
.size = CONFIG_UART5_TXBUFSIZE,
.buffer = g_uart5txbuffer,
},
#ifdef CONFIG_UART5_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_uart5priv,
},
.irq = STM32_IRQ_UART5,
.parity = CONFIG_UART5_PARITY,
.bits = CONFIG_UART5_BITS,
.stopbits2 = CONFIG_UART5_2STOP,
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.iflow = false,
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
.oflow = false,
#endif
.baud = CONFIG_UART5_BAUD,
.apbclock = STM32_PCLK1_FREQUENCY,
.usartbase = STM32_UART5_BASE,
.tx_gpio = GPIO_UART5_TX,
.rx_gpio = GPIO_UART5_RX,
#ifdef CONFIG_SERIAL_OFLOWCONTROL
.cts_gpio = 0,
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
.rts_gpio = 0,
#endif
#ifdef CONFIG_UART5_RXDMA
.rxdma_channel = DMAMAP_UART5_RX,
.rxfifo = g_uart5rxfifo,
#endif
.vector = up_interrupt_uart5,
#ifdef CONFIG_UART5_RS485
.rs485_dir_gpio = GPIO_UART5_RS485_DIR,
# if (CONFIG_UART5_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 USART6 port. */
#ifdef CONFIG_STM32_USART6
static struct up_dev_s g_usart6priv =
{
.dev =
{
#if CONSOLE_UART == 6
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_USART6_RXBUFSIZE,
.buffer = g_usart6rxbuffer,
},
.xmit =
{
.size = CONFIG_USART6_TXBUFSIZE,
.buffer = g_usart6txbuffer,
},
#ifdef CONFIG_USART6_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_usart6priv,
},
.irq = STM32_IRQ_USART6,
.parity = CONFIG_USART6_PARITY,
.bits = CONFIG_USART6_BITS,
.stopbits2 = CONFIG_USART6_2STOP,
.baud = CONFIG_USART6_BAUD,
.apbclock = STM32_PCLK2_FREQUENCY,
.usartbase = STM32_USART6_BASE,
.tx_gpio = GPIO_USART6_TX,
.rx_gpio = GPIO_USART6_RX,
#if defined(CONFIG_SERIAL_OFLOWCONTROL) && defined(CONFIG_USART6_OFLOWCONTROL)
.oflow = true,
.cts_gpio = GPIO_USART6_CTS,
#endif
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART6_IFLOWCONTROL)
.iflow = true,
.rts_gpio = GPIO_USART6_RTS,
#endif
#ifdef CONFIG_USART6_RXDMA
.rxdma_channel = DMAMAP_USART6_RX,
.rxfifo = g_usart6rxfifo,
#endif
.vector = up_interrupt_usart6,
#ifdef CONFIG_USART6_RS485
.rs485_dir_gpio = GPIO_USART6_RS485_DIR,
# if (CONFIG_USART6_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 UART7 port. */
#ifdef CONFIG_STM32_UART7
static struct up_dev_s g_uart7priv =
{
.dev =
{
#if CONSOLE_UART == 7
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_UART7_RXBUFSIZE,
.buffer = g_uart7rxbuffer,
},
.xmit =
{
.size = CONFIG_UART7_TXBUFSIZE,
.buffer = g_uart7txbuffer,
},
#ifdef CONFIG_UART7_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_uart7priv,
},
.irq = STM32_IRQ_UART7,
.parity = CONFIG_UART7_PARITY,
.bits = CONFIG_UART7_BITS,
.stopbits2 = CONFIG_UART7_2STOP,
.baud = CONFIG_UART7_BAUD,
.apbclock = STM32_PCLK1_FREQUENCY,
.usartbase = STM32_UART7_BASE,
.tx_gpio = GPIO_UART7_TX,
.rx_gpio = GPIO_UART7_RX,
#if defined(CONFIG_SERIAL_OFLOWCONTROL) && defined(CONFIG_USART7_OFLOWCONTROL)
.oflow = true,
.cts_gpio = GPIO_UART7_CTS,
#endif
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART7_IFLOWCONTROL)
.iflow = true,
.rts_gpio = GPIO_UART7_RTS,
#endif
#ifdef CONFIG_UART7_RXDMA
.rxdma_channel = DMAMAP_UART7_RX,
.rxfifo = g_uart7rxfifo,
#endif
.vector = up_interrupt_uart7,
#ifdef CONFIG_UART7_RS485
.rs485_dir_gpio = GPIO_UART7_RS485_DIR,
# if (CONFIG_UART7_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This describes the state of the STM32 UART8 port. */
#ifdef CONFIG_STM32_UART8
static struct up_dev_s g_uart8priv =
{
.dev =
{
#if CONSOLE_UART == 8
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_UART8_RXBUFSIZE,
.buffer = g_uart8rxbuffer,
},
.xmit =
{
.size = CONFIG_UART8_TXBUFSIZE,
.buffer = g_uart8txbuffer,
},
#ifdef CONFIG_UART8_RXDMA
.ops = &g_uart_dma_ops,
#else
.ops = &g_uart_ops,
#endif
.priv = &g_uart8priv,
},
.irq = STM32_IRQ_UART8,
.parity = CONFIG_UART8_PARITY,
.bits = CONFIG_UART8_BITS,
.stopbits2 = CONFIG_UART8_2STOP,
.baud = CONFIG_UART8_BAUD,
.apbclock = STM32_PCLK1_FREQUENCY,
.usartbase = STM32_UART8_BASE,
.tx_gpio = GPIO_UART8_TX,
.rx_gpio = GPIO_UART8_RX,
#if defined(CONFIG_SERIAL_OFLOWCONTROL) && defined(CONFIG_USART8_OFLOWCONTROL)
.oflow = true,
.cts_gpio = GPIO_UART8_CTS,
#endif
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_USART8_IFLOWCONTROL)
.iflow = true,
.rts_gpio = GPIO_UART8_RTS,
#endif
#ifdef CONFIG_UART8_RXDMA
.rxdma_channel = DMAMAP_UART8_RX,
.rxfifo = g_uart8rxfifo,
#endif
.vector = up_interrupt_uart8,
#ifdef CONFIG_UART8_RS485
.rs485_dir_gpio = GPIO_UART8_RS485_DIR,
# if (CONFIG_UART8_RS485_DIR_POLARITY == 0)
.rs485_dir_polarity = false,
# else
.rs485_dir_polarity = true,
# endif
#endif
};
#endif
/* This table lets us iterate over the configured USARTs */
static struct up_dev_s * const uart_devs[STM32_NUSART] =
{
#ifdef CONFIG_STM32_USART1
[0] = &g_usart1priv,
#endif
#ifdef CONFIG_STM32_USART2
[1] = &g_usart2priv,
#endif
#ifdef CONFIG_STM32_USART3
[2] = &g_usart3priv,
#endif
#ifdef CONFIG_STM32_UART4
[3] = &g_uart4priv,
#endif
#ifdef CONFIG_STM32_UART5
[4] = &g_uart5priv,
#endif
#ifdef CONFIG_STM32_USART6
[5] = &g_usart6priv,
#endif
#ifdef CONFIG_STM32_UART7
[6] = &g_uart7priv,
#endif
#ifdef CONFIG_STM32_UART8
[7] = &g_uart8priv,
#endif
};
#ifdef CONFIG_PM
static struct pm_callback_s g_serialcb =
{
.notify = up_pm_notify,
.prepare = up_pm_prepare,
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline uint32_t up_serialin(struct up_dev_s *priv, int offset)
{
return getreg32(priv->usartbase + offset);
}
/****************************************************************************
* Name: up_serialout
****************************************************************************/
static inline void up_serialout(struct up_dev_s *priv, int offset, uint32_t value)
{
putreg32(value, priv->usartbase + offset);
}
/****************************************************************************
* Name: up_restoreusartint
****************************************************************************/
static void up_restoreusartint(struct up_dev_s *priv, uint16_t ie)
{
uint32_t cr;
/* Save the interrupt mask */
priv->ie = ie;
/* And restore the interrupt state (see the interrupt enable/usage table above) */
cr = up_serialin(priv, STM32_USART_CR1_OFFSET);
cr &= ~(USART_CR1_USED_INTS);
cr |= (ie & (USART_CR1_USED_INTS));
up_serialout(priv, STM32_USART_CR1_OFFSET, cr);
cr = up_serialin(priv, STM32_USART_CR3_OFFSET);
cr &= ~USART_CR3_EIE;
cr |= (ie & USART_CR3_EIE);
up_serialout(priv, STM32_USART_CR3_OFFSET, cr);
}
/****************************************************************************
* Name: up_disableusartint
****************************************************************************/
static inline void up_disableusartint(struct up_dev_s *priv, uint16_t *ie)
{
if (ie)
{
uint32_t cr1;
uint32_t cr3;
/* USART interrupts:
*
* Enable Status Meaning Usage
* ------------------ --------------- ------------------------------ ----------
* USART_CR1_IDLEIE USART_SR_IDLE Idle Line Detected (not used)
* USART_CR1_RXNEIE USART_SR_RXNE Received Data Ready to be Read
* " " USART_SR_ORE Overrun Error Detected
* USART_CR1_TCIE USART_SR_TC Transmission Complete (used only for RS-485)
* USART_CR1_TXEIE USART_SR_TXE Transmit Data Register Empty
* USART_CR1_PEIE USART_SR_PE Parity Error
*
* USART_CR2_LBDIE USART_SR_LBD Break Flag (not used)
* USART_CR3_EIE USART_SR_FE Framing Error
* " " USART_SR_NE Noise Error
* " " USART_SR_ORE Overrun Error Detected
* USART_CR3_CTSIE USART_SR_CTS CTS flag (not used)
*/
cr1 = up_serialin(priv, STM32_USART_CR1_OFFSET);
cr3 = up_serialin(priv, STM32_USART_CR3_OFFSET);
/* Return the current interrupt mask value for the used interrupts. Notice
* that this depends on the fact that none of the used interrupt enable bits
* overlap. This logic would fail if we needed the break interrupt!
*/
*ie = (cr1 & (USART_CR1_USED_INTS)) | (cr3 & USART_CR3_EIE);
}
/* Disable all interrupts */
up_restoreusartint(priv, 0);
}
/****************************************************************************
* Name: up_dma_nextrx
*
* Description:
* Returns the index into the RX FIFO where the DMA will place the next
* byte that it receives.
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static int up_dma_nextrx(struct up_dev_s *priv)
{
size_t dmaresidual;
dmaresidual = stm32_dmaresidual(priv->rxdma);
return (RXDMA_BUFFER_SIZE - (int)dmaresidual);
}
#endif
/****************************************************************************
* Name: up_set_format
*
* Description:
* Set the serial line format and speed.
*
****************************************************************************/
#ifndef CONFIG_SUPPRESS_UART_CONFIG
static void up_set_format(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
uint32_t regval;
#if defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F37XX)
/* This first implementation is for U[S]ARTs that support oversampling
* by 8 in additional to the standard oversampling by 16.
*/
uint32_t usartdiv8;
uint32_t cr1;
uint32_t brr;
/* In case of oversampling by 8, the equation is:
*
* baud = 2 * fCK / usartdiv8
* usartdiv8 = 2 * fCK / baud
*/
usartdiv8 = ((priv->apbclock << 1) + (priv->baud >> 1)) / priv->baud;
/* Baud rate for standard USART (SPI mode included):
*
* In case of oversampling by 16, the equation is:
* baud = fCK / usartdiv16
* usartdiv16 = fCK / baud
* = 2 * usartdiv8
*/
/* Use oversamply by 8 only if the divisor is small. But what is small? */
cr1 = up_serialin(priv, STM32_USART_CR1_OFFSET);
if (usartdiv8 > 100)
{
/* Use usartdiv16 */
brr = (usartdiv8 + 1) >> 1;
/* Clear oversampling by 8 to enable oversampling by 16 */
cr1 &= ~USART_CR1_OVER8;
}
else
{
DEBUGASSERT(usartdiv8 >= 8);
/* Perform mysterious operations on bits 0-3 */
brr = ((usartdiv8 & 0xfff0) | ((usartdiv8 & 0x000f) >> 1));
/* Set oversampling by 8 */
cr1 |= USART_CR1_OVER8;
}
up_serialout(priv, STM32_USART_CR1_OFFSET, cr1);
up_serialout(priv, STM32_USART_BRR_OFFSET, brr);
#else
/* This second implementation is for U[S]ARTs that support fractional
* dividers.
*/
uint32_t usartdiv32;
uint32_t mantissa;
uint32_t fraction;
uint32_t brr;
/* Configure the USART Baud Rate. The baud rate for the receiver and
* transmitter (Rx and Tx) are both set to the same value as programmed
* in the Mantissa and Fraction values of USARTDIV.
*
* baud = fCK / (16 * usartdiv)
* usartdiv = fCK / (16 * baud)
*
* Where fCK is the input clock to the peripheral (PCLK1 for USART2, 3, 4, 5
* or PCLK2 for USART1)
*
* First calculate (NOTE: all stand baud values are even so dividing by two
* does not lose precision):
*
* usartdiv32 = 32 * usartdiv = fCK / (baud/2)
*/
usartdiv32 = priv->apbclock / (priv->baud >> 1);
/* The mantissa part is then */
mantissa = usartdiv32 >> 5;
brr = mantissa << USART_BRR_MANT_SHIFT;
/* The fractional remainder (with rounding) */
fraction = (usartdiv32 - (mantissa << 5) + 1) >> 1;
brr |= fraction << USART_BRR_FRAC_SHIFT;
up_serialout(priv, STM32_USART_BRR_OFFSET, brr);
#endif
/* Configure parity mode */
regval = up_serialin(priv, STM32_USART_CR1_OFFSET);
regval &= ~(USART_CR1_PCE | USART_CR1_PS | USART_CR1_M);
if (priv->parity == 1) /* Odd parity */
{
regval |= (USART_CR1_PCE | USART_CR1_PS);
}
else if (priv->parity == 2) /* Even parity */
{
regval |= USART_CR1_PCE;
}
/* Configure word length (parity uses one of configured bits)
*
* Default: 1 start, 8 data (no parity), n stop, OR
* 1 start, 7 data + parity, n stop
*/
if (priv->bits == 9 || (priv->bits == 8 && priv->parity != 0))
{
/* Select: 1 start, 8 data + parity, n stop, OR
* 1 start, 9 data (no parity), n stop.
*/
regval |= USART_CR1_M;
}
up_serialout(priv, STM32_USART_CR1_OFFSET, regval);
/* Configure STOP bits */
regval = up_serialin(priv, STM32_USART_CR2_OFFSET);
regval &= ~(USART_CR2_STOP_MASK);
if (priv->stopbits2)
{
regval |= USART_CR2_STOP2;
}
up_serialout(priv, STM32_USART_CR2_OFFSET, regval);
/* Configure hardware flow control */
regval = up_serialin(priv, STM32_USART_CR3_OFFSET);
regval &= ~(USART_CR3_CTSE|USART_CR3_RTSE);
#if defined(CONFIG_SERIAL_IFLOWCONTROL) && !defined(CONFIG_STM32_FLOWCONTROL_BROKEN)
if (priv->iflow && (priv->rts_gpio != 0))
{
regval |= USART_CR3_RTSE;
}
#endif
#ifdef CONFIG_SERIAL_OFLOWCONTROL
if (priv->oflow && (priv->cts_gpio != 0))
{
regval |= USART_CR3_CTSE;
}
#endif
up_serialout(priv, STM32_USART_CR3_OFFSET, regval);
}
#endif /* CONFIG_SUPPRESS_UART_CONFIG */
/****************************************************************************
* Name: up_set_apb_clock
*
* Description:
* Enable or disable APB clock for the USART peripheral
*
* Input parameters:
* dev - A reference to the UART driver state structure
* on - Enable clock if 'on' is 'true' and disable if 'false'
*
****************************************************************************/
static void up_set_apb_clock(struct uart_dev_s *dev, bool on)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
uint32_t rcc_en;
uint32_t regaddr;
/* Determine which USART to configure */
switch (priv->usartbase)
{
default:
return;
#ifdef CONFIG_STM32_USART1
case STM32_USART1_BASE:
rcc_en = RCC_APB2ENR_USART1EN;
regaddr = STM32_RCC_APB2ENR;
break;
#endif
#ifdef CONFIG_STM32_USART2
case STM32_USART2_BASE:
rcc_en = RCC_APB1ENR_USART2EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32_USART3
case STM32_USART3_BASE:
rcc_en = RCC_APB1ENR_USART3EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32_UART4
case STM32_UART4_BASE:
rcc_en = RCC_APB1ENR_UART4EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32_UART5
case STM32_UART5_BASE:
rcc_en = RCC_APB1ENR_UART5EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32_USART6
case STM32_USART6_BASE:
rcc_en = RCC_APB2ENR_USART6EN;
regaddr = STM32_RCC_APB2ENR;
break;
#endif
#ifdef CONFIG_STM32_UART7
case STM32_UART7_BASE:
rcc_en = RCC_APB1ENR_UART7EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32_UART8
case STM32_UART8_BASE:
rcc_en = RCC_APB1ENR_UART8EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
}
/* Enable/disable APB 1/2 clock for USART */
if (on)
{
modifyreg32(regaddr, 0, rcc_en);
}
else
{
modifyreg32(regaddr, rcc_en, 0);
}
}
/****************************************************************************
* Name: up_setup
*
* Description:
* Configure the USART baud, bits, parity, etc. This method is called the
* first time that the serial port is opened.
*
****************************************************************************/
static int up_setup(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
#ifndef CONFIG_SUPPRESS_UART_CONFIG
uint32_t regval;
/* Note: The logic here depends on the fact that that the USART module
* was enabled in stm32_lowsetup().
*/
/* Enable USART APB1/2 clock */
up_set_apb_clock(dev, true);
/* Configure pins for USART use */
stm32_configgpio(priv->tx_gpio);
stm32_configgpio(priv->rx_gpio);
#ifdef CONFIG_SERIAL_OFLOWCONTROL
if (priv->cts_gpio != 0)
{
stm32_configgpio(priv->cts_gpio);
}
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->rts_gpio != 0)
{
uint32_t config = priv->rts_gpio;
#ifdef CONFIG_STM32_FLOWCONTROL_BROKEN
/* Instead of letting hw manage this pin, we will bitbang */
config = (config & ~GPIO_MODE_MASK) | GPIO_OUTPUT;
#endif
stm32_configgpio(config);
}
#endif
#ifdef HAVE_RS485
if (priv->rs485_dir_gpio != 0)
{
stm32_configgpio(priv->rs485_dir_gpio);
stm32_gpiowrite(priv->rs485_dir_gpio, !priv->rs485_dir_polarity);
}
#endif
/* Configure CR2 */
/* Clear STOP, CLKEN, CPOL, CPHA, LBCL, and interrupt enable bits */
regval = up_serialin(priv, STM32_USART_CR2_OFFSET);
regval &= ~(USART_CR2_STOP_MASK | USART_CR2_CLKEN | USART_CR2_CPOL |
USART_CR2_CPHA | USART_CR2_LBCL | USART_CR2_LBDIE);
/* Configure STOP bits */
if (priv->stopbits2)
{
regval |= USART_CR2_STOP2;
}
up_serialout(priv, STM32_USART_CR2_OFFSET, regval);
/* Configure CR1 */
/* Clear TE, REm and all interrupt enable bits */
regval = up_serialin(priv, STM32_USART_CR1_OFFSET);
regval &= ~(USART_CR1_TE | USART_CR1_RE | USART_CR1_ALLINTS);
up_serialout(priv, STM32_USART_CR1_OFFSET, regval);
/* Configure CR3 */
/* Clear CTSE, RTSE, and all interrupt enable bits */
regval = up_serialin(priv, STM32_USART_CR3_OFFSET);
regval &= ~(USART_CR3_CTSIE | USART_CR3_CTSE | USART_CR3_RTSE | USART_CR3_EIE);
up_serialout(priv, STM32_USART_CR3_OFFSET, regval);
/* Configure the USART line format and speed. */
up_set_format(dev);
/* Enable Rx, Tx, and the USART */
regval = up_serialin(priv, STM32_USART_CR1_OFFSET);
regval |= (USART_CR1_UE | USART_CR1_TE | USART_CR1_RE);
up_serialout(priv, STM32_USART_CR1_OFFSET, regval);
#endif /* CONFIG_SUPPRESS_UART_CONFIG */
/* Set up the cached interrupt enables value */
priv->ie = 0;
return OK;
}
/****************************************************************************
* Name: up_dma_setup
*
* Description:
* Configure the USART baud, bits, parity, etc. This method is called the
* first time that the serial port is opened.
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static int up_dma_setup(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
int result;
uint32_t regval;
/* Do the basic UART setup first, unless we are the console */
if (!dev->isconsole)
{
result = up_setup(dev);
if (result != OK)
{
return result;
}
}
/* Acquire the DMA channel. This should always succeed. */
priv->rxdma = stm32_dmachannel(priv->rxdma_channel);
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->iflow)
{
/* Configure for non-circular DMA reception into the RX FIFO */
stm32_dmasetup(priv->rxdma,
priv->usartbase + STM32_USART_RDR_OFFSET,
(uint32_t)priv->rxfifo,
RXDMA_BUFFER_SIZE,
SERIAL_DMA_IFLOW_CONTROL_WORD);
}
else
#endif
{
/* Configure for circular DMA reception into the RX FIFO */
stm32_dmasetup(priv->rxdma,
priv->usartbase + STM32_USART_RDR_OFFSET,
(uint32_t)priv->rxfifo,
RXDMA_BUFFER_SIZE,
SERIAL_DMA_CONTROL_WORD);
}
/* Reset our DMA shadow pointer to match the address just
* programmed above.
*/
priv->rxdmanext = 0;
/* Enable receive DMA for the UART */
regval = up_serialin(priv, STM32_USART_CR3_OFFSET);
regval |= USART_CR3_DMAR;
up_serialout(priv, STM32_USART_CR3_OFFSET, regval);
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->iflow)
{
/* Start the DMA channel, and arrange for callbacks at the full point
* in the FIFO. After buffer gets full, hardware flow-control kicks
* in and DMA transfer is stopped.
*/
stm32_dmastart(priv->rxdma, up_dma_rxcallback, (void *)priv, false);
}
else
#endif
{
/* Start the DMA channel, and arrange for callbacks at the half and
* full points in the FIFO. This ensures that we have half a FIFO
* worth of time to claim bytes before they are overwritten.
*/
stm32_dmastart(priv->rxdma, up_dma_rxcallback, (void *)priv, true);
}
return OK;
}
#endif
/****************************************************************************
* Name: up_shutdown
*
* Description:
* Disable the USART. This method is called when the serial
* port is closed
*
****************************************************************************/
static void up_shutdown(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
uint32_t regval;
/* Disable all interrupts */
up_disableusartint(priv, NULL);
/* Disable USART APB1/2 clock */
up_set_apb_clock(dev, false);
/* Disable Rx, Tx, and the UART */
regval = up_serialin(priv, STM32_USART_CR1_OFFSET);
regval &= ~(USART_CR1_UE | USART_CR1_TE | USART_CR1_RE);
up_serialout(priv, STM32_USART_CR1_OFFSET, regval);
/* Release pins. "If the serial-attached device is powered down, the TX
* pin causes back-powering, potentially confusing the device to the point
* of complete lock-up."
*
* REVISIT: Is unconfiguring the pins appropriate for all device? If not,
* then this may need to be a configuration option.
*/
stm32_unconfiggpio(priv->tx_gpio);
stm32_unconfiggpio(priv->rx_gpio);
#ifdef CONFIG_SERIAL_OFLOWCONTROL
if (priv->cts_gpio != 0)
{
stm32_unconfiggpio(priv->cts_gpio);
}
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->rts_gpio != 0)
{
stm32_unconfiggpio(priv->rts_gpio);
}
#endif
#ifdef HAVE_RS485
if (priv->rs485_dir_gpio != 0)
{
stm32_unconfiggpio(priv->rs485_dir_gpio);
}
#endif
}
/****************************************************************************
* Name: up_dma_shutdown
*
* Description:
* Disable the USART. This method is called when the serial
* port is closed
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static void up_dma_shutdown(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
/* Perform the normal UART shutdown */
up_shutdown(dev);
/* Stop the DMA channel */
stm32_dmastop(priv->rxdma);
/* Release the DMA channel */
stm32_dmafree(priv->rxdma);
priv->rxdma = NULL;
}
#endif
/****************************************************************************
* Name: up_attach
*
* Description:
* Configure the USART to operation in interrupt driven mode. This method is
* called when the serial port is opened. Normally, this is just after the
* the setup() method is called, however, the serial console may operate in
* a non-interrupt driven mode during the boot phase.
*
* RX and TX interrupts are not enabled when by the attach method (unless the
* hardware supports multiple levels of interrupt enabling). The RX and TX
* interrupts are not enabled until the txint() and rxint() methods are called.
*
****************************************************************************/
static int up_attach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
int ret;
/* Attach and enable the IRQ */
ret = irq_attach(priv->irq, priv->vector);
if (ret == OK)
{
/* Enable the interrupt (RX and TX interrupts are still disabled
* in the USART
*/
up_enable_irq(priv->irq);
}
return ret;
}
/****************************************************************************
* Name: up_detach
*
* Description:
* Detach USART interrupts. This method is called when the serial port is
* closed normally just before the shutdown method is called. The exception
* is the serial console which is never shutdown.
*
****************************************************************************/
static void up_detach(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
up_disable_irq(priv->irq);
irq_detach(priv->irq);
}
/****************************************************************************
* Name: up_interrupt_common
*
* Description:
* This is the USART interrupt handler. It will be invoked when an
* interrupt received on the 'irq' It should call uart_transmitchars or
* uart_receivechar to perform the appropriate data transfers. The
* interrupt handling logic must be able to map the 'irq' number into the
* appropriate uart_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_interrupt_common(struct up_dev_s *priv)
{
int passes;
bool handled;
/* Report serial activity to the power management logic */
#if defined(CONFIG_PM) && CONFIG_PM_SERIAL_ACTIVITY > 0
pm_activity(CONFIG_PM_SERIAL_ACTIVITY);
#endif
/* Loop until there are no characters to be transferred or,
* until we have been looping for a long time.
*/
handled = true;
for (passes = 0; passes < 256 && handled; passes++)
{
handled = false;
/* Get the masked USART status word. */
priv->sr = up_serialin(priv, STM32_USART_SR_OFFSET);
/* USART interrupts:
*
* Enable Status Meaning Usage
* ------------------ --------------- ------------------------------- ----------
* USART_CR1_IDLEIE USART_SR_IDLE Idle Line Detected (not used)
* USART_CR1_RXNEIE USART_SR_RXNE Received Data Ready to be Read
* " " USART_SR_ORE Overrun Error Detected
* USART_CR1_TCIE USART_SR_TC Transmission Complete (used only for RS-485)
* USART_CR1_TXEIE USART_SR_TXE Transmit Data Register Empty
* USART_CR1_PEIE USART_SR_PE Parity Error
*
* USART_CR2_LBDIE USART_SR_LBD Break Flag (not used)
* USART_CR3_EIE USART_SR_FE Framing Error
* " " USART_SR_NE Noise Error
* " " USART_SR_ORE Overrun Error Detected
* USART_CR3_CTSIE USART_SR_CTS CTS flag (not used)
*
* NOTE: Some of these status bits must be cleared by explicity writing zero
* to the SR register: USART_SR_CTS, USART_SR_LBD. Note of those are currently
* being used.
*/
#ifdef HAVE_RS485
/* Transmission of whole buffer is over - TC is set, TXEIE is cleared.
* Note - this should be first, to have the most recent TC bit value from
* SR register - sending data affects TC, but without refresh we will not
* know that...
*/
if ((priv->sr & USART_SR_TC) != 0 && (priv->ie & USART_CR1_TCIE) != 0 &&
(priv->ie & USART_CR1_TXEIE) == 0)
{
stm32_gpiowrite(priv->rs485_dir_gpio, !priv->rs485_dir_polarity);
up_restoreusartint(priv, priv->ie & ~USART_CR1_TCIE);
}
#endif
/* Handle incoming, receive bytes. */
if ((priv->sr & USART_SR_RXNE) != 0 && (priv->ie & USART_CR1_RXNEIE) != 0)
{
/* Received data ready... process incoming bytes. NOTE the check for
* RXNEIE: We cannot call uart_recvchards of RX interrupts are disabled.
*/
uart_recvchars(&priv->dev);
handled = true;
}
/* We may still have to read from the DR register to clear any pending
* error conditions.
*/
else if ((priv->sr & (USART_SR_ORE | USART_SR_NE | USART_SR_FE)) != 0)
{
#if defined(CONFIG_STM32_STM32F30XX) || defined(CONFIG_STM32_STM32F37XX)
/* These errors are cleared by writing the corresponding bit to the
* interrupt clear register (ICR).
*/
up_serialout(priv, STM32_USART_ICR_OFFSET,
(USART_ICR_NCF | USART_ICR_ORECF | USART_ICR_FECF));
#else
/* If an error occurs, read from DR to clear the error (data has
* been lost). If ORE is set along with RXNE then it tells you
* that the byte *after* the one in the data register has been
* lost, but the data register value is correct. That case will
* be handled above if interrupts are enabled. Otherwise, that
* good byte will be lost.
*/
(void)up_serialin(priv, STM32_USART_RDR_OFFSET);
#endif
}
/* Handle outgoing, transmit bytes */
if ((priv->sr & USART_SR_TXE) != 0 && (priv->ie & USART_CR1_TXEIE) != 0)
{
/* Transmit data register empty ... process outgoing bytes */
uart_xmitchars(&priv->dev);
handled = true;
}
}
return OK;
}
/****************************************************************************
* Name: up_ioctl
*
* Description:
* All ioctl calls will be routed through this method
*
****************************************************************************/
static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
{
#if defined(CONFIG_SERIAL_TERMIOS) || defined(CONFIG_SERIAL_TIOCSERGSTRUCT)
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
#endif
#ifdef CONFIG_SERIAL_TERMIOS
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
#endif
int ret = OK;
switch (cmd)
{
#ifdef CONFIG_SERIAL_TIOCSERGSTRUCT
case TIOCSERGSTRUCT:
{
struct up_dev_s *user = (struct up_dev_s *)arg;
if (!user)
{
ret = -EINVAL;
}
else
{
memcpy(user, dev, sizeof(struct up_dev_s));
}
}
break;
#endif
#ifdef CONFIG_STM32_USART_SINGLEWIRE
case TIOCSSINGLEWIRE:
{
/* Change the TX port to be open-drain/push-pull and enable/disable
* half-duplex mode.
*/
uint32_t cr = up_serialin(priv, STM32_USART_CR3_OFFSET);
#if defined(CONFIG_STM32_STM32F10XX)
if (arg == SER_SINGLEWIRE_ENABLED)
{
stm32_configgpio((priv->tx_gpio & ~(GPIO_CNF_MASK)) | GPIO_CNF_AFOD);
cr |= USART_CR3_HDSEL;
}
else
{
stm32_configgpio((priv->tx_gpio & ~(GPIO_CNF_MASK)) | GPIO_CNF_AFPP);
cr &= ~USART_CR3_HDSEL;
}
#else
if (arg == SER_SINGLEWIRE_ENABLED)
{
stm32_configgpio(priv->tx_gpio | GPIO_OPENDRAIN);
cr |= USART_CR3_HDSEL;
}
else
{
stm32_configgpio(priv->tx_gpio | GPIO_PUSHPULL);
cr &= ~USART_CR3_HDSEL;
}
#endif
up_serialout(priv, STM32_USART_CR3_OFFSET, cr);
}
break;
#endif
#ifdef CONFIG_SERIAL_TERMIOS
case TCGETS:
{
struct termios *termiosp = (struct termios*)arg;
if (!termiosp)
{
ret = -EINVAL;
break;
}
cfsetispeed(termiosp, priv->baud);
/* Note that since we only support 8/9 bit modes and
* there is no way to report 9-bit mode, we always claim 8.
*/
termiosp->c_cflag =
((priv->parity != 0) ? PARENB : 0) |
((priv->parity == 1) ? PARODD : 0) |
((priv->stopbits2) ? CSTOPB : 0) |
#ifdef CONFIG_SERIAL_OFLOWCONTROL
((priv->oflow) ? CCTS_OFLOW : 0) |
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
((priv->iflow) ? CRTS_IFLOW : 0) |
#endif
CS8;
/* TODO: CCTS_IFLOW, CCTS_OFLOW */
}
break;
case TCSETS:
{
struct termios *termiosp = (struct termios*)arg;
if (!termiosp)
{
ret = -EINVAL;
break;
}
/* Perform some sanity checks before accepting any changes */
if (((termiosp->c_cflag & CSIZE) != CS8)
#ifdef CONFIG_SERIAL_IFLOWCONTROL
|| ((termiosp->c_cflag & CCTS_OFLOW) && (priv->cts_gpio == 0))
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
|| ((termiosp->c_cflag & CRTS_IFLOW) && (priv->rts_gpio == 0))
#endif
)
{
ret = -EINVAL;
break;
}
if (termiosp->c_cflag & PARENB)
{
priv->parity = (termiosp->c_cflag & PARODD) ? 1 : 2;
}
else
{
priv->parity = 0;
}
priv->stopbits2 = (termiosp->c_cflag & CSTOPB) != 0;
#ifdef CONFIG_SERIAL_OFLOWCONTROL
priv->oflow = (termiosp->c_cflag & CCTS_OFLOW) != 0;
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
priv->iflow = (termiosp->c_cflag & CRTS_IFLOW) != 0;
#endif
/* Note that since there is no way to request 9-bit mode
* and no way to support 5/6/7-bit modes, we ignore them
* all here.
*/
/* Note that only cfgetispeed is used because we have knowledge
* that only one speed is supported.
*/
priv->baud = cfgetispeed(termiosp);
/* Effect the changes immediately - note that we do not implement
* TCSADRAIN / TCSAFLUSH
*/
up_set_format(dev);
}
break;
#endif /* CONFIG_SERIAL_TERMIOS */
#ifdef CONFIG_USART_BREAKS
case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */
{
irqstate_t flags = irqsave();
uint32_t cr2 = up_serialin(priv, STM32_USART_CR2_OFFSET);
up_serialout(priv, STM32_USART_CR2_OFFSET, cr2 | USART_CR2_LINEN);
irqrestore(flags);
}
break;
case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */
{
irqstate_t flags;
flags = irqsave();
uint32_t cr1 = up_serialin(priv, STM32_USART_CR2_OFFSET);
up_serialout(priv, STM32_USART_CR2_OFFSET, cr2 & ~USART_CR2_LINEN);
irqrestore(flags);
}
break;
#endif
default:
ret = -ENOTTY;
break;
}
return ret;
}
/****************************************************************************
* Name: up_receive
*
* Description:
* Called (usually) from the interrupt level to receive one
* character from the USART. Error bits associated with the
* receipt are provided in the return 'status'.
*
****************************************************************************/
#ifndef SERIAL_HAVE_ONLY_DMA
static int up_receive(struct uart_dev_s *dev, unsigned int *status)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
uint32_t rdr;
/* Get the Rx byte */
rdr = up_serialin(priv, STM32_USART_RDR_OFFSET);
/* Get the Rx byte plux error information. Return those in status */
*status = priv->sr << 16 | rdr;
priv->sr = 0;
/* Then return the actual received byte */
return rdr & 0xff;
}
#endif
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
#ifndef SERIAL_HAVE_ONLY_DMA
static void up_rxint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
irqstate_t flags;
uint16_t ie;
/* USART receive interrupts:
*
* Enable Status Meaning Usage
* ------------------ --------------- ------------------------------- ----------
* USART_CR1_IDLEIE USART_SR_IDLE Idle Line Detected (not used)
* USART_CR1_RXNEIE USART_SR_RXNE Received Data Ready to be Read
* " " USART_SR_ORE Overrun Error Detected
* USART_CR1_PEIE USART_SR_PE Parity Error
*
* USART_CR2_LBDIE USART_SR_LBD Break Flag (not used)
* USART_CR3_EIE USART_SR_FE Framing Error
* " " USART_SR_NE Noise Error
* " " USART_SR_ORE Overrun Error Detected
*/
flags = irqsave();
ie = priv->ie;
if (enable)
{
/* Receive an interrupt when their is anything in the Rx data register (or an Rx
* timeout occurs).
*/
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
#ifdef CONFIG_USART_ERRINTS
ie |= (USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR3_EIE);
#else
ie |= USART_CR1_RXNEIE;
#endif
#endif
}
else
{
ie &= ~(USART_CR1_RXNEIE | USART_CR1_PEIE | USART_CR3_EIE);
}
/* Then set the new interrupt state */
up_restoreusartint(priv, ie);
irqrestore(flags);
}
#endif
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return true if the receive register is not empty
*
****************************************************************************/
#ifndef SERIAL_HAVE_ONLY_DMA
static bool up_rxavailable(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
return ((up_serialin(priv, STM32_USART_SR_OFFSET) & USART_SR_RXNE) != 0);
}
#endif
/****************************************************************************
* Name: up_rxflowcontrol
*
* Description:
* Called when Rx buffer is full (or exceeds configured watermark levels
* if CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS is defined).
* Return true if UART activated RX flow control to block more incoming
* data
*
* Input parameters:
* dev - UART device instance
* nbuffered - the number of characters currently buffered
* (if CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS is
* not defined the value will be 0 for an empty buffer or the
* defined buffer size for a full buffer)
* upper - true indicates the upper watermark was crossed where
* false indicates the lower watermark has been crossed
*
* Returned Value:
* true if RX flow control activated.
*
****************************************************************************/
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool up_rxflowcontrol(struct uart_dev_s *dev,
unsigned int nbuffered, bool upper)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
#if defined(CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS) && \
defined(CONFIG_STM32_FLOWCONTROL_BROKEN)
if (priv->iflow && (priv->rts_gpio != 0))
{
/* Assert/de-assert nRTS set it high resume/stop sending */
stm32_gpiowrite(priv->rts_gpio, upper);
return upper;
}
#else
if (priv->iflow)
{
/* Is the RX buffer full? */
if (upper)
{
/* Disable Rx interrupt to prevent more data being from
* peripheral. When hardware RTS is enabled, this will
* prevent more data from coming in.
*
* This function is only called when UART recv buffer is full,
* that is: "dev->recv.head + 1 == dev->recv.tail".
*
* Logic in "uart_read" will automatically toggle Rx interrupts
* when buffer is read empty and thus we do not have to re-
* enable Rx interrupts.
*/
uart_disablerxint(dev);
return true;
}
/* No.. The RX buffer is empty */
else
{
/* We might leave Rx interrupt disabled if full recv buffer was
* read empty. Enable Rx interrupt to make sure that more input is
* received.
*/
uart_enablerxint(dev);
}
}
#endif
return false;
}
#endif
/****************************************************************************
* Name: up_dma_receive
*
* Description:
* Called (usually) from the interrupt level to receive one
* character from the USART. Error bits associated with the
* receipt are provided in the return 'status'.
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static int up_dma_receive(struct uart_dev_s *dev, unsigned int *status)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
int c = 0;
if (up_dma_nextrx(priv) != priv->rxdmanext)
{
c = priv->rxfifo[priv->rxdmanext];
priv->rxdmanext++;
if (priv->rxdmanext == RXDMA_BUFFER_SIZE)
{
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->iflow)
{
/* RX DMA buffer full. RX paused, RTS line pulled up to prevent
* more input data from other end.
*/
}
else
#endif
{
priv->rxdmanext = 0;
}
}
}
return c;
}
#endif
/****************************************************************************
* Name: up_dma_reenable
*
* Description:
* Call to re-enable RX DMA.
*
****************************************************************************/
#if defined(SERIAL_HAVE_DMA) && defined(CONFIG_SERIAL_IFLOWCONTROL)
static void up_dma_reenable(struct up_dev_s *priv)
{
/* Configure for non-circular DMA reception into the RX fifo */
stm32_dmasetup(priv->rxdma,
priv->usartbase + STM32_USART_RDR_OFFSET,
(uint32_t)priv->rxfifo,
RXDMA_BUFFER_SIZE,
SERIAL_DMA_IFLOW_CONTROL_WORD);
/* Reset our DMA shadow pointer to match the address just
* programmed above.
*/
priv->rxdmanext = 0;
/* Start the DMA channel, and arrange for callbacks at the full point in
* the FIFO. After buffer gets full, hardware flow-control kicks in and
* DMA transfer is stopped.
*/
stm32_dmastart(priv->rxdma, up_dma_rxcallback, (void *)priv, false);
}
#endif
/****************************************************************************
* Name: up_dma_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static void up_dma_rxint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
/* En/disable DMA reception.
*
* Note that it is not safe to check for available bytes and immediately
* pass them to uart_recvchars as that could potentially recurse back
* to us again. Instead, bytes must wait until the next up_dma_poll or
* DMA event.
*/
priv->rxenable = enable;
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->iflow && priv->rxenable && (priv->rxdmanext == RXDMA_BUFFER_SIZE))
{
/* Re-enable RX DMA. */
up_dma_reenable(priv);
}
#endif
}
#endif
/****************************************************************************
* Name: up_dma_rxavailable
*
* Description:
* Return true if the receive register is not empty
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static bool up_dma_rxavailable(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
/* Compare our receive pointer to the current DMA pointer, if they
* do not match, then there are bytes to be received.
*/
return (up_dma_nextrx(priv) != priv->rxdmanext);
}
#endif
/****************************************************************************
* Name: up_send
*
* Description:
* This method will send one byte on the USART
*
****************************************************************************/
static void up_send(struct uart_dev_s *dev, int ch)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
#ifdef HAVE_RS485
if (priv->rs485_dir_gpio != 0)
{
stm32_gpiowrite(priv->rs485_dir_gpio, priv->rs485_dir_polarity);
}
#endif
up_serialout(priv, STM32_USART_TDR_OFFSET, (uint32_t)ch);
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct uart_dev_s *dev, bool enable)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
irqstate_t flags;
/* USART transmit interrupts:
*
* Enable Status Meaning Usage
* ------------------ --------------- ---------------------------- ----------
* USART_CR1_TCIE USART_SR_TC Transmission Complete (used only for RS-485)
* USART_CR1_TXEIE USART_SR_TXE Transmit Data Register Empty
* USART_CR3_CTSIE USART_SR_CTS CTS flag (not used)
*/
flags = irqsave();
if (enable)
{
/* Set to receive an interrupt when the TX data register is empty */
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
uint16_t ie = priv->ie | USART_CR1_TXEIE;
/* If RS-485 is supported on this U[S]ART, then also enable the
* transmission complete interrupt.
*/
# ifdef HAVE_RS485
if (priv->rs485_dir_gpio != 0)
{
ie |= USART_CR1_TCIE;
}
# endif
up_restoreusartint(priv, ie);
/* Fake a TX interrupt here by just calling uart_xmitchars() with
* interrupts disabled (note this may recurse).
*/
uart_xmitchars(dev);
#endif
}
else
{
/* Disable the TX interrupt */
up_restoreusartint(priv, priv->ie & ~USART_CR1_TXEIE);
}
irqrestore(flags);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return true if the transmit data register is empty
*
****************************************************************************/
static bool up_txready(struct uart_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
return ((up_serialin(priv, STM32_USART_SR_OFFSET) & USART_SR_TXE) != 0);
}
/****************************************************************************
* Name: up_interrupt_u[s]art[n]
*
* Description:
* Interrupt handlers for U[S]ART[n] where n=1,..,6.
*
****************************************************************************/
#ifdef CONFIG_STM32_USART1
static int up_interrupt_usart1(int irq, void *context)
{
return up_interrupt_common(&g_usart1priv);
}
#endif
#ifdef CONFIG_STM32_USART2
static int up_interrupt_usart2(int irq, void *context)
{
return up_interrupt_common(&g_usart2priv);
}
#endif
#ifdef CONFIG_STM32_USART3
static int up_interrupt_usart3(int irq, void *context)
{
return up_interrupt_common(&g_usart3priv);
}
#endif
#ifdef CONFIG_STM32_UART4
static int up_interrupt_uart4(int irq, void *context)
{
return up_interrupt_common(&g_uart4priv);
}
#endif
#ifdef CONFIG_STM32_UART5
static int up_interrupt_uart5(int irq, void *context)
{
return up_interrupt_common(&g_uart5priv);
}
#endif
#ifdef CONFIG_STM32_USART6
static int up_interrupt_usart6(int irq, void *context)
{
return up_interrupt_common(&g_usart6priv);
}
#endif
#ifdef CONFIG_STM32_UART7
static int up_interrupt_uart7(int irq, void *context)
{
return up_interrupt_common(&g_uart7priv);
}
#endif
#ifdef CONFIG_STM32_UART8
static int up_interrupt_uart8(int irq, void *context)
{
return up_interrupt_common(&g_uart8priv);
}
#endif
/****************************************************************************
* Name: up_dma_rxcallback
*
* Description:
* This function checks the current DMA state and calls the generic
* serial stack when bytes appear to be available.
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
static void up_dma_rxcallback(DMA_HANDLE handle, uint8_t status, void *arg)
{
struct up_dev_s *priv = (struct up_dev_s *)arg;
if (priv->rxenable && up_dma_rxavailable(&priv->dev))
{
uart_recvchars(&priv->dev);
#ifdef CONFIG_SERIAL_IFLOWCONTROL
if (priv->iflow && priv->rxenable &&
(priv->rxdmanext == RXDMA_BUFFER_SIZE))
{
/* Re-enable RX DMA. */
up_dma_reenable(priv);
}
#endif
}
}
#endif
/****************************************************************************
* Name: up_pm_notify
*
* Description:
* Notify the driver of new power state. This callback is called after
* all drivers have had the opportunity to prepare for the new power state.
*
* Input Parameters:
*
* cb - Returned to the driver. The driver version of the callback
* structure may include additional, driver-specific state data at
* the end of the structure.
*
* pmstate - Identifies the new PM state
*
* Returned Value:
* None - The driver already agreed to transition to the low power
* consumption state when when it returned OK to the prepare() call.
*
*
****************************************************************************/
#ifdef CONFIG_PM
static void up_pm_notify(struct pm_callback_s *cb, enum pm_state_e pmstate)
{
switch (pmstate)
{
case(PM_NORMAL):
{
/* Logic for PM_NORMAL goes here */
}
break;
case(PM_IDLE):
{
/* Logic for PM_IDLE goes here */
}
break;
case(PM_STANDBY):
{
/* Logic for PM_STANDBY goes here */
}
break;
case(PM_SLEEP):
{
/* Logic for PM_SLEEP goes here */
}
break;
default:
/* Should not get here */
break;
}
}
#endif
/****************************************************************************
* Name: up_pm_prepare
*
* Description:
* Request the driver to prepare for a new power state. This is a warning
* that the system is about to enter into a new power state. The driver
* should begin whatever operations that may be required to enter power
* state. The driver may abort the state change mode by returning a
* non-zero value from the callback function.
*
* Input Parameters:
*
* cb - Returned to the driver. The driver version of the callback
* structure may include additional, driver-specific state data at
* the end of the structure.
*
* pmstate - Identifies the new PM state
*
* Returned Value:
* Zero - (OK) means the event was successfully processed and that the
* driver is prepared for the PM state change.
*
* Non-zero - means that the driver is not prepared to perform the tasks
* needed achieve this power setting and will cause the state
* change to be aborted. NOTE: The prepare() method will also
* be called when reverting from lower back to higher power
* consumption modes (say because another driver refused a
* lower power state change). Drivers are not permitted to
* return non-zero values when reverting back to higher power
* consumption modes!
*
****************************************************************************/
#ifdef CONFIG_PM
static int up_pm_prepare(struct pm_callback_s *cb, enum pm_state_e pmstate)
{
/* Logic to prepare for a reduced power state goes here. */
return OK;
}
#endif
#endif /* HAVE_UART */
#endif /* USE_SERIALDRIVER */
/****************************************************************************
* Public Functions
****************************************************************************/
#ifdef USE_SERIALDRIVER
/****************************************************************************
* Name: up_earlyserialinit
*
* Description:
* Performs the low level USART initialization early in debug so that the
* serial console will be available during bootup. This must be called
* before up_serialinit.
*
****************************************************************************/
#ifdef USE_EARLYSERIALINIT
void up_earlyserialinit(void)
{
#ifdef HAVE_UART
unsigned i;
/* Disable all USART interrupts */
for (i = 0; i < STM32_NUSART; i++)
{
if (uart_devs[i])
{
up_disableusartint(uart_devs[i], NULL);
}
}
/* Configure whichever one is the console */
#if CONSOLE_UART > 0
up_setup(&uart_devs[CONSOLE_UART - 1]->dev);
#endif
#endif /* HAVE UART */
}
#endif
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
#ifdef HAVE_UART
char devname[16];
unsigned i;
unsigned minor = 0;
#ifdef CONFIG_PM
int ret;
#endif
/* Register to receive power management callbacks */
#ifdef CONFIG_PM
ret = pm_register(&g_serialcb);
DEBUGASSERT(ret == OK);
UNUSED(ret);
#endif
/* Register the console */
#if CONSOLE_UART > 0
(void)uart_register("/dev/console", &uart_devs[CONSOLE_UART - 1]->dev);
#ifndef CONFIG_SERIAL_DISABLE_REORDERING
/* If not disabled, register the console UART to ttyS0 and exclude
* it from initializing it further down
*/
(void)uart_register("/dev/ttyS0", &uart_devs[CONSOLE_UART - 1]->dev);
minor = 1;
#endif
#ifdef SERIAL_HAVE_CONSOLE_DMA
/* If we need to re-initialise the console to enable DMA do that here. */
up_dma_setup(&uart_devs[CONSOLE_UART - 1]->dev);
#endif
#endif /* CONSOLE_UART > 0 */
/* Register all remaining USARTs */
strcpy(devname, "/dev/ttySx");
for (i = 0; i < STM32_NUSART; i++)
{
/* Don't create a device for non-configured ports. */
if (uart_devs[i] == 0)
{
continue;
}
#ifndef CONFIG_SERIAL_DISABLE_REORDERING
/* Don't create a device for the console - we did that above */
if (uart_devs[i]->dev.isconsole)
{
continue;
}
#endif
/* Register USARTs as devices in increasing order */
devname[9] = '0' + minor++;
(void)uart_register(devname, &uart_devs[i]->dev);
}
#endif /* HAVE UART */
}
/****************************************************************************
* Name: stm32_serial_dma_poll
*
* Description:
* Checks receive DMA buffers for received bytes that have not accumulated
* to the point where the DMA half/full interrupt has triggered.
*
* This function should be called from a timer or other periodic context.
*
****************************************************************************/
#ifdef SERIAL_HAVE_DMA
void stm32_serial_dma_poll(void)
{
irqstate_t flags;
flags = irqsave();
#ifdef CONFIG_USART1_RXDMA
if (g_usart1priv.rxdma != NULL)
{
up_dma_rxcallback(g_usart1priv.rxdma, 0, &g_usart1priv);
}
#endif
#ifdef CONFIG_USART2_RXDMA
if (g_usart2priv.rxdma != NULL)
{
up_dma_rxcallback(g_usart2priv.rxdma, 0, &g_usart2priv);
}
#endif
#ifdef CONFIG_USART3_RXDMA
if (g_usart3priv.rxdma != NULL)
{
up_dma_rxcallback(g_usart3priv.rxdma, 0, &g_usart3priv);
}
#endif
#ifdef CONFIG_UART4_RXDMA
if (g_uart4priv.rxdma != NULL)
{
up_dma_rxcallback(g_uart4priv.rxdma, 0, &g_uart4priv);
}
#endif
#ifdef CONFIG_UART5_RXDMA
if (g_uart5priv.rxdma != NULL)
{
up_dma_rxcallback(g_uart5priv.rxdma, 0, &g_uart5priv);
}
#endif
#ifdef CONFIG_USART6_RXDMA
if (g_usart6priv.rxdma != NULL)
{
up_dma_rxcallback(g_usart6priv.rxdma, 0, &g_usart6priv);
}
#endif
#ifdef CONFIG_UART7_RXDMA
if (g_uart7priv.rxdma != NULL)
{
up_dma_rxcallback(g_uart7priv.rxdma, 0, &g_uart7priv);
}
#endif
#ifdef CONFIG_UART8_RXDMA
if (g_uart8priv.rxdma != NULL)
{
up_dma_rxcallback(g_uart8priv.rxdma, 0, &g_uart8priv);
}
#endif
irqrestore(flags);
}
#endif
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#if CONSOLE_UART > 0
struct up_dev_s *priv = uart_devs[CONSOLE_UART - 1];
uint16_t ie;
up_disableusartint(priv, &ie);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
up_restoreusartint(priv, ie);
#endif
return ch;
}
#else /* USE_SERIALDRIVER */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#if CONSOLE_UART > 0
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#endif
return ch;
}
#endif /* USE_SERIALDRIVER */
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