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nuttx/arch/arm/src/stm32f0l0g0/stm32_serial_v2.c
Xiang Xiao 2e54df0f35 Don't include assert.h from public header file 
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2021-06-03 08:36:03 -07:00

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/****************************************************************************
* arch/arm/src/stm32f0l0g0/stm32_serial_v2.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/serial/serial.h>
#include <nuttx/power/pm.h>
#ifdef CONFIG_SERIAL_TERMIOS
# include <termios.h>
#endif
#include "arm_arch.h"
#include "arm_internal.h"
#include "chip.h"
#include "stm32_gpio.h"
#include "hardware/stm32_pinmap.h"
#include "stm32_rcc.h"
#include "stm32_uart.h"
#include <arch/board/board.h>
#ifdef CONFIG_STM32F0L0G0_USART3
# error not supported yet
#endif
#ifdef CONFIG_STM32F0L0G0_USART4
# error not supported yet
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Some sanity checks *******************************************************/
/* Total number of possible serial devices */
#define STM32_NSERIAL (STM32_NUSART)
#define HAVE_UART
/* Power management definitions */
#if defined(CONFIG_PM) && !defined(CONFIG_STM32F0L0G0_PM_SERIAL_ACTIVITY)
# define CONFIG_STM32F0L0G0_PM_SERIAL_ACTIVITY 10
#endif
#if defined(CONFIG_PM)
# define PM_IDLE_DOMAIN 0 /* Revisit */
#endif
/* Keep track if a Break was set
*
* Note:
*
* 1) This value is set in the priv->ie but never written to the control
* register. It must not collide with USART_CR1_USED_INTS or USART_CR3_EIE
* 2) USART_CR3_EIE is also carried in the up_dev_s ie member.
*
* See up_restoreusartint where the masking is done.
*/
#ifdef CONFIG_STM32F0L0G0_SERIALBRK_BSDCOMPAT
# define USART_CR1_IE_BREAK_INPROGRESS_SHFTS 15
# define USART_CR1_IE_BREAK_INPROGRESS (1 << USART_CR1_IE_BREAK_INPROGRESS_SHFTS)
#endif
#ifdef USE_SERIALDRIVER
#ifdef HAVE_UART
/* Warnings for potentially unsafe configuration combinations. */
#if defined(CONFIG_STM32F0L0G0_FLOWCONTROL_BROKEN) && \
!defined(CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS)
# error "CONFIG_STM32F0L0G0_FLOWCONTROL_BROKEN requires \
CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS to be enabled."
#endif
/****************************************************************************
* 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 */
/* Has been initialized and HW is setup. */
bool initialized;
/* 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 rxftcfg; /* Rx FIFO threshold level */
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 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(int irq, void *context, FAR void *arg);
static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
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);
#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 CONFIG_PM
static void up_pm_notify(struct pm_callback_s *cb, int domain,
enum pm_state_e pmstate);
static int up_pm_prepare(struct pm_callback_s *cb, int domain,
enum pm_state_e pmstate);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
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,
};
/* Receive/Transmit buffers */
#ifdef CONFIG_STM32F0L0G0_USART1
static char g_usart1rxbuffer[CONFIG_USART1_RXBUFSIZE];
static char g_usart1txbuffer[CONFIG_USART1_TXBUFSIZE];
#endif
#ifdef CONFIG_STM32F0L0G0_USART2
static char g_usart2rxbuffer[CONFIG_USART2_RXBUFSIZE];
static char g_usart2txbuffer[CONFIG_USART2_TXBUFSIZE];
#endif
#ifdef CONFIG_STM32F0L0G0_USART3
static char g_usart3rxbuffer[CONFIG_USART3_RXBUFSIZE];
static char g_usart3txbuffer[CONFIG_USART3_TXBUFSIZE];
#endif
#ifdef CONFIG_STM32F0L0G0_USART4
static char g_usart4rxbuffer[CONFIG_USART4_RXBUFSIZE];
static char g_usart4txbuffer[CONFIG_USART4_TXBUFSIZE];
#endif
/* This describes the state of the STM32 USART1 ports. */
#ifdef CONFIG_STM32F0L0G0_USART1
static struct up_dev_s g_usart1priv =
{
.dev =
{
#if CONSOLE_USART == 1
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_USART1_RXBUFSIZE,
.buffer = g_usart1rxbuffer,
},
.xmit =
{
.size = CONFIG_USART1_TXBUFSIZE,
.buffer = g_usart1txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_usart1priv,
},
.irq = STM32_IRQ_USART1,
.rxftcfg = CONFIG_USART1_RXFIFO_THRES,
.parity = CONFIG_USART1_PARITY,
.bits = CONFIG_USART1_BITS,
.stopbits2 = CONFIG_USART1_2STOP,
.baud = CONFIG_USART1_BAUD,
.apbclock = STM32_PCLK1_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_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_STM32F0L0G0_USART2
static struct up_dev_s g_usart2priv =
{
.dev =
{
#if CONSOLE_USART == 2
.isconsole = true,
#endif
.recv =
{
.size = CONFIG_USART2_RXBUFSIZE,
.buffer = g_usart2rxbuffer,
},
.xmit =
{
.size = CONFIG_USART2_TXBUFSIZE,
.buffer = g_usart2txbuffer,
},
.ops = &g_uart_ops,
.priv = &g_usart2priv,
},
.irq = STM32_IRQ_USART2,
.rxftcfg = CONFIG_USART2_RXFIFO_THRES,
.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_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
/* TODO: USART3 */
/* TODO: USART4 */
/* This table lets us iterate over the configured USARTs */
static struct up_dev_s * const g_uart_devs[STM32_NSERIAL] =
{
#ifdef CONFIG_STM32F0L0G0_USART1
[0] = &g_usart1priv,
#endif
#ifdef CONFIG_STM32F0L0G0_USART2
[1] = &g_usart2priv,
#endif
#ifdef CONFIG_STM32F0L0G0_USART3
[2] = &g_usart3priv,
#endif
#ifdef CONFIG_STM32F0L0G0_USART4
[3] = &g_usart4priv
#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_serialmod
****************************************************************************/
static inline void up_serialmod(struct up_dev_s *priv, int offset,
uint32_t clrbits, uint32_t setbits)
{
uint32_t addr = priv->usartbase + offset;
uint32_t regval = (getreg32(addr) & ~clrbits) | setbits;
putreg32(regval, addr);
}
/****************************************************************************
* Name: up_setusartint
****************************************************************************/
static inline void up_setusartint(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_restoreusartint
****************************************************************************/
static void up_restoreusartint(struct up_dev_s *priv, uint16_t ie)
{
irqstate_t flags;
flags = enter_critical_section();
up_setusartint(priv, ie);
leave_critical_section(flags);
}
/****************************************************************************
* Name: up_disableusartint
****************************************************************************/
static void up_disableusartint(struct up_dev_s *priv, uint16_t *ie)
{
irqstate_t flags;
flags = enter_critical_section();
if (ie)
{
uint32_t cr1;
uint32_t cr3;
/* USART interrupts:
*
* Enable Status Meaning Usage
* ---------------- -------------- ----------------------- ----------
* USART_CR1_IDLEIE USART_ISR_IDLE Idle Line Detected (not used)
* USART_CR1_RXNEIE USART_ISR_RXNE Received Data Ready
* to be Read
* " " USART_ISR_ORE Overrun Error Detected
* USART_CR1_TCIE USART_ISR_TC Transmission Complete (used only
* for RS-485)
* USART_CR1_TXEIE USART_ISR_TXE Transmit Data Register
* Empty
* USART_CR1_PEIE USART_ISR_PE Parity Error
*
* USART_CR2_LBDIE USART_ISR_LBD Break Flag (not used)
* USART_CR3_EIE USART_ISR_FE Framing Error
* " " USART_ISR_NF Noise Error
* " " USART_ISR_ORE Overrun Error Detected
* USART_CR3_CTSIE USART_ISR_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_setusartint(priv, 0);
leave_critical_section(flags);
}
/****************************************************************************
* 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;
uint32_t usartdiv8;
uint32_t cr1;
uint32_t cr1_ue;
uint32_t brr;
irqstate_t flags;
flags = enter_critical_section();
/* Get the original state of UE */
cr1 = up_serialin(priv, STM32_USART_CR1_OFFSET);
cr1_ue = cr1 & USART_CR1_UE;
cr1 &= ~USART_CR1_UE;
/* Disable UE as the format bits and baud rate registers can not be
* updated while UE = 1
*/
up_serialout(priv, STM32_USART_CR1_OFFSET, cr1);
/* 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? */
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);
/* Configure parity mode */
cr1 &= ~(USART_CR1_PCE | USART_CR1_PS | USART_CR1_M0 | USART_CR1_M1);
if (priv->parity == 1) /* Odd parity */
{
cr1 |= (USART_CR1_PCE | USART_CR1_PS);
}
else if (priv->parity == 2) /* Even parity */
{
cr1 |= 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.
*/
cr1 |= USART_CR1_M0;
}
else if (priv->bits == 7 && priv->parity == 0)
{
/* Select: 1 start, 7 data (no parity), n stop, OR
*/
cr1 |= USART_CR1_M1;
}
/* Else Select: 1 start, 7 data + parity, n stop, OR
* 1 start, 8 data (no parity), n stop.
*/
up_serialout(priv, STM32_USART_CR1_OFFSET, cr1);
/* 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_STM32F0L0G0_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);
up_serialout(priv, STM32_USART_CR1_OFFSET, cr1 | cr1_ue);
leave_critical_section(flags);
}
#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_STM32F0L0G0_USART1
case STM32_USART1_BASE:
rcc_en = RCC_APB2ENR_USART1EN;
regaddr = STM32_RCC_APB2ENR;
break;
#endif
#ifdef CONFIG_STM32F0L0G0_USART2
case STM32_USART2_BASE:
rcc_en = RCC_APB1ENR_USART2EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32F0L0G0_USART3
case STM32_USART3_BASE:
rcc_en = RCC_APB1ENR_USART3EN;
regaddr = STM32_RCC_APB1ENR;
break;
#endif
#ifdef CONFIG_STM32F0L0G0_USART4
case STM32_USART4_BASE:
rcc_en = RCC_APB1ENR_USART4EN;
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;
/* Make sure that USART is disabled */
up_serialout(priv, STM32_USART_CR1_OFFSET, 0);
#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_STM32F0L0G0_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);
/* Set Rx FIFO threshold to the configured level */
regval |= USART_CR3_RXFTCFG(priv->rxftcfg);
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 */
/* Enable FIFO */
regval = up_serialin(priv, STM32_USART_CR1_OFFSET);
regval |= (USART_CR1_UE | USART_CR1_TE | USART_CR1_RE);
regval |= USART_CR1_FIFOEN;
up_serialout(priv, STM32_USART_CR1_OFFSET, regval);
#endif /* CONFIG_SUPPRESS_UART_CONFIG */
/* Set up the cached interrupt enables value */
priv->ie = 0;
/* Mark device as initialized. */
priv->initialized = true;
return OK;
}
/****************************************************************************
* 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;
/* Mark device as uninitialized. */
priv->initialized = false;
/* 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_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, up_interrupt, priv);
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
*
* 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(int irq, void *context, FAR void *arg)
{
struct up_dev_s *priv = (struct up_dev_s *)arg;
int passes;
bool handled;
DEBUGASSERT(priv != NULL);
/* Report serial activity to the power management logic */
#if defined(CONFIG_PM) && CONFIG_STM32F0L0G0_PM_SERIAL_ACTIVITY > 0
pm_activity(PM_IDLE_DOMAIN, CONFIG_STM32F0L0G0_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_ISR_OFFSET);
/* USART interrupts:
*
* Enable Status Meaning Usage
* ---------------- -------------- ----------------------- ----------
* USART_CR1_IDLEIE USART_ISR_IDLE Idle Line Detected (not used)
* USART_CR1_RXNEIE USART_ISR_RXNE Received Data Ready
* to be Read
* " " USART_ISR_ORE Overrun Error Detected
* USART_CR1_TCIE USART_ISR_TC Transmission Complete (used only
* for RS-485)
* USART_CR1_TXEIE USART_ISR_TXE Transmit Data
* Register Empty
* USART_CR1_PEIE USART_ISR_PE Parity Error
*
* USART_CR2_LBDIE USART_ISR_LBD Break Flag (not used)
* USART_CR3_EIE USART_ISR_FE Framing Error
* " " USART_ISR_NF Noise Error
* " " USART_ISR_ORE Overrun Error Detected
* USART_CR3_CTSIE USART_ISR_CTS CTS flag (not used)
*
* NOTE:
* Some of these status bits must be cleared by explicitly writing zero
* to the SR register: USART_ISR_CTS, USART_ISR_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_ISR_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_ISR_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_ISR_ORE | USART_ISR_NE | USART_ISR_FE)) != 0)
{
/* 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));
}
/* Handle outgoing, transmit bytes */
if ((priv->sr & USART_ISR_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) \
|| defined(CONFIG_STM32F0L0G0_USART_SINGLEWIRE) \
|| defined(CONFIG_STM32F0L0G0_SERIALBRK_BSDCOMPAT)
struct inode *inode = filep->f_inode;
struct uart_dev_s *dev = inode->i_private;
#endif
#if defined(CONFIG_SERIAL_TERMIOS) \
|| defined(CONFIG_STM32F0L0G0_USART_SINGLEWIRE) \
|| defined(CONFIG_STM32F0L0G0_SERIALBRK_BSDCOMPAT)
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_STM32F0L0G0_USART_SINGLEWIRE
case TIOCSSINGLEWIRE:
{
uint32_t cr1;
uint32_t cr1_ue;
irqstate_t flags;
flags = enter_critical_section();
/* Get the original state of UE */
cr1 = up_serialin(priv, STM32_USART_CR1_OFFSET);
cr1_ue = cr1 & USART_CR1_UE;
cr1 &= ~USART_CR1_UE;
/* Disable UE, HDSEL can only be written when UE=0 */
up_serialout(priv, STM32_USART_CR1_OFFSET, cr1);
/* 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 ((arg & SER_SINGLEWIRE_ENABLED) != 0)
{
uint32_t gpio_val = (arg & SER_SINGLEWIRE_PUSHPULL) ==
SER_SINGLEWIRE_PUSHPULL ?
GPIO_PUSHPULL : GPIO_OPENDRAIN;
gpio_val |= (arg & SER_SINGLEWIRE_PULL_MASK) ==
SER_SINGLEWIRE_PULLUP ?
GPIO_PULLUP : GPIO_FLOAT;
gpio_val |= (arg & SER_SINGLEWIRE_PULL_MASK) ==
SER_SINGLEWIRE_PULLDOWN ?
GPIO_PULLDOWN : GPIO_FLOAT;
stm32_configgpio((priv->tx_gpio &
~(GPIO_PUPD_MASK | GPIO_OPENDRAIN)) | gpio_val);
cr |= USART_CR3_HDSEL;
}
else
{
stm32_configgpio((priv->tx_gpio &
~(GPIO_PUPD_MASK | GPIO_OPENDRAIN)) |
GPIO_PUSHPULL);
cr &= ~USART_CR3_HDSEL;
}
up_serialout(priv, STM32_USART_CR3_OFFSET, cr);
/* Re-enable UE if appropriate */
up_serialout(priv, STM32_USART_CR1_OFFSET, cr1 | cr1_ue);
leave_critical_section(flags);
}
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_OFLOWCONTROL
|| ((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_STM32F0L0G0_USART_BREAKS
# ifdef CONFIG_STM32F0L0G0_SERIALBRK_BSDCOMPAT
case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */
{
irqstate_t flags;
uint32_t tx_break;
flags = enter_critical_section();
/* Disable any further tx activity */
priv->ie |= USART_CR1_IE_BREAK_INPROGRESS;
up_txint(dev, false);
/* Configure TX as a GPIO output pin and Send a break signal */
tx_break = GPIO_OUTPUT | (~(GPIO_MODE_MASK | GPIO_OUTPUT_SET) &
priv->tx_gpio);
stm32_configgpio(tx_break);
leave_critical_section(flags);
}
break;
case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */
{
irqstate_t flags;
flags = enter_critical_section();
/* Configure TX back to U(S)ART */
stm32_configgpio(priv->tx_gpio);
priv->ie &= ~USART_CR1_IE_BREAK_INPROGRESS;
/* Enable further tx activity */
up_txint(dev, true);
leave_critical_section(flags);
}
break;
# else
case TIOCSBRK: /* No BSD compatibility: Turn break on for M bit times */
{
uint32_t cr1;
irqstate_t flags;
flags = enter_critical_section();
cr1 = up_serialin(priv, STM32_USART_CR1_OFFSET);
up_serialout(priv, STM32_USART_RQR_OFFSET, cr1 | USART_RQR_SBKRQ);
leave_critical_section(flags);
}
break;
case TIOCCBRK: /* No BSD compatibility: HW does not support stopping a break */
break;
# endif
#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'.
*
****************************************************************************/
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;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
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_ISR_IDLE Idle Line Detected (not used)
* USART_CR1_RXNEIE USART_ISR_RXNE Received Data Ready
* to be Read
* " " USART_ISR_ORE Overrun Error Detected
* USART_CR1_PEIE USART_ISR_PE Parity Error
*
* USART_CR2_LBDIE USART_ISR_LBD Break Flag (not used)
* USART_CR3_EIE USART_ISR_FE Framing Error
* " " USART_ISR_NF Noise Error
* " " USART_ISR_ORE Overrun Error Detected
*/
flags = enter_critical_section();
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);
leave_critical_section(flags);
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return true if the receive register is not empty
*
****************************************************************************/
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_ISR_OFFSET) & USART_ISR_RXNE) != 0);
}
/****************************************************************************
* 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_STM32F0L0G0_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);
if (upper)
{
/* With heavy Rx traffic, RXNE might be set and data pending.
* Returning 'true' in such case would cause RXNE left unhandled
* and causing interrupt storm. Sending end might be also be slow
* to react on nRTS, and returning 'true' here would prevent
* processing that data.
*
* Therefore, return 'false' so input data is still being processed
* until sending end reacts on nRTS signal and stops sending more.
*/
return false;
}
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_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_ISR_TC Transmission Complete (used only
* for RS-485)
* USART_CR1_TXEIE USART_ISR_TXE Transmit Data
* Register Empty
* USART_CR3_CTSIE USART_ISR_CTS CTS flag (not used)
*/
flags = enter_critical_section();
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
# ifdef CONFIG_STM32_SERIALBRK_BSDCOMPAT
if (priv->ie & USART_CR1_IE_BREAK_INPROGRESS)
{
return;
}
# 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);
}
leave_critical_section(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_ISR_OFFSET) & USART_ISR_TXE) != 0);
}
/****************************************************************************
* 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, int domain,
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, int domain,
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: stm32_serial_get_uart
*
* Description:
* Get serial driver structure for STM32 USART
*
****************************************************************************/
FAR uart_dev_t *stm32_serial_get_uart(int uart_num)
{
int uart_idx = uart_num - 1;
if (uart_idx < 0 || uart_idx >= STM32_NSERIAL || !g_uart_devs[uart_idx])
{
return NULL;
}
if (!g_uart_devs[uart_idx]->initialized)
{
return NULL;
}
return &g_uart_devs[uart_idx]->dev;
}
/****************************************************************************
* Name: arm_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 arm_serialinit.
*
****************************************************************************/
#ifdef USE_EARLYSERIALINIT
void arm_earlyserialinit(void)
{
#ifdef HAVE_UART
unsigned i;
/* Disable all USART interrupts */
for (i = 0; i < STM32_NSERIAL; i++)
{
if (g_uart_devs[i])
{
up_disableusartint(g_uart_devs[i], NULL);
}
}
/* Configure whichever one is the console */
#if CONSOLE_USART > 0
up_setup(&g_uart_devs[CONSOLE_USART - 1]->dev);
#endif
#endif /* HAVE UART */
}
#endif
/****************************************************************************
* Name: arm_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that arm_earlyserialinit was called previously.
*
****************************************************************************/
void arm_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_USART > 0
uart_register("/dev/console", &g_uart_devs[CONSOLE_USART - 1]->dev);
#ifndef CONFIG_STM32F0L0G0_SERIAL_DISABLE_REORDERING
/* If not disabled, register the console UART to ttyS0 and exclude
* it from initializing it further down
*/
uart_register("/dev/ttyS0", &g_uart_devs[CONSOLE_USART - 1]->dev);
minor = 1;
#endif
#endif /* CONSOLE_USART > 0 */
/* Register all remaining USARTs */
strcpy(devname, "/dev/ttySx");
for (i = 0; i < STM32_NSERIAL; i++)
{
/* Don't create a device for non-configured ports. */
if (g_uart_devs[i] == 0)
{
continue;
}
#ifndef CONFIG_STM32F0L0G0_SERIAL_DISABLE_REORDERING
/* Don't create a device for the console - we did that above */
if (g_uart_devs[i]->dev.isconsole)
{
continue;
}
#endif
/* Register USARTs as devices in increasing order */
devname[9] = '0' + minor++;
uart_register(devname, &g_uart_devs[i]->dev);
}
#endif /* HAVE UART */
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#if CONSOLE_USART > 0
struct up_dev_s *priv = g_uart_devs[CONSOLE_USART - 1];
uint16_t ie;
up_disableusartint(priv, &ie);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
arm_lowputc('\r');
}
arm_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_USART > 0
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
arm_lowputc('\r');
}
arm_lowputc(ch);
#endif
return ch;
}
#endif /* USE_SERIALDRIVER */
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