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Add framework (only) for STM32 USART support

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2094 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-09-26 00:09:17 +00:00
parent 342ab7a6e3
commit a71055cddd
4 changed files with 1043 additions and 4 deletions
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5
arch/arm/src/stm32/Make.defs
View File

@ -45,6 +45,5 @@ CMN_CSRCS = up_allocateheap.c up_assert.c up_blocktask.c up_copystate.c \
up_usestack.c up_doirq.c up_hardfault.c up_svcall.c
CHIP_ASRCS =
CHIP_CSRCS = stm32_start.c
# stm32_irq.c stm32_gpio.c stm32_timerisr.c stm32_lowputc.c \
# stm32_serial.c stm32_spi.c stm32_dumpgpio.c
CHIP_CSRCS = stm32_start.c stm32_lowputc.c stm32_serial.c
# stm32_irq.c stm32_gpio.c stm32_timerisr.c stm32_spi.c stm32_dumpgpio.c

176
arch/arm/src/stm32/stm32_lowputc.c Normal file
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@ -0,0 +1,176 @@
/**************************************************************************
* arch/arm/src/stm32/stm32_lowputc.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 "up_internal.h"
#include "up_arch.h"
#include "chip.h"
#include "stm32_internal.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/* Configuration **********************************************************/
/* Is there a serial console? */
#if defined(CONFIG_USART1_SERIAL_CONSOLE) && !defined(CONFIG_USART1_DISABLE)
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && !defined(CONFIG_USART2_DISABLE)
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && !defined(CONFIG_USART3_DISABLE)
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#else
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# undef HAVE_CONSOLE
#endif
/* Select USART parameters for the selected console */
#if defined(CONFIG_USART1_SERIAL_CONSOLE)
# define STM32_CONSOLE_BASE STM32_USART1_BASE
# define STM32_CONSOLE_BAUD CONFIG_USART1_BAUD
# define STM32_CONSOLE_BITS CONFIG_USART1_BITS
# define STM32_CONSOLE_PARITY CONFIG_USART1_PARITY
# define STM32_CONSOLE_2STOP CONFIG_USART1_2STOP
#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define STM32_CONSOLE_BASE STM32_USART2_BASE
# define STM32_CONSOLE_BAUD CONFIG_USART2_BAUD
# define STM32_CONSOLE_BITS CONFIG_USART2_BITS
# define STM32_CONSOLE_PARITY CONFIG_USART2_PARITY
# define STM32_CONSOLE_2STOP CONFIG_USART2_2STOP
#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
# define STM32_CONSOLE_BASE STM32_USART2_BASE
# define STM32_CONSOLE_BAUD CONFIG_USART2_BAUD
# define STM32_CONSOLE_BITS CONFIG_USART2_BITS
# define STM32_CONSOLE_PARITY CONFIG_USART2_PARITY
# define STM32_CONSOLE_2STOP CONFIG_USART2_2STOP
#else
# error "No CONFIG_USARTn_SERIAL_CONSOLE Setting"
#endif
/* Calculate BAUD rate from the SYS clock */
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowputc
*
* Description:
* Output one byte on the serial console
*
**************************************************************************/
void up_lowputc(char ch)
{
#ifdef HAVE_CONSOLE
/* Wait until the TX FIFO is not full */
/* Then send the character */
#endif
}
/**************************************************************************
* Name: up_lowsetup
*
* Description:
* This performs basic initialization of the USART used for the serial
* console. Its purpose is to get the console output availabe as soon
* as possible.
*
**************************************************************************/
void up_lowsetup(void)
{
/* Enable the selected USARTs and configure GPIO pins need byed the
* the selected USARTs. NOTE: The serial driver later depends on
* this pin configuration -- whether or not a serial console is selected.
*/
#ifndef CONFIG_USART1_DISABLE
#endif
#ifndef CONFIG_USART1_DISABLE
#endif
#ifndef CONFIG_USART2_DISABLE
#endif
/* Enable and configure the selected console device */
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_USART_CONFIG)
#endif
}

2
arch/arm/src/stm32/stm32_memorymap.h
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@ -117,7 +117,7 @@
#define STM32_RCC_BASE 0x40021000 /* 0x40021000 - 0x400213ff: Reset and Clock control RCC */
/* 0x40021400 - 0x40021fff: Reserved */
#define STM32_OTGFS_BASE 0x50000000 /* 0x50000000 - 0x500003ff: USB OTG FS */
#define STM32_FLASH_BASE 0x40022000 /* 0x40022000 - 0x400223ff: Flash memory interface */
#define STM32_FLASHIF_BASE 0x40022000 /* 0x40022000 - 0x400223ff: Flash memory interface */
#define STM32_CRC_BASE 0x40028000 /* 0x40023000 - 0x400233ff: RC */
/* 0x40023400 - 0x40027fff: Reserved */
#define STM32_ETHERNET_BASE 0x40028000 /* 0x40028000 - 0x40029fff: Ethernet */

864
arch/arm/src/stm32/stm32_serial.c Normal file
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@ -0,0 +1,864 @@
/****************************************************************************
* arch/arm/src/stm32/stm32_serial.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <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.h>
#include <arch/serial.h>
#include "chip.h"
#include "up_arch.h"
#include "up_internal.h"
#include "os_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Some sanity checks *******************************************************/
/* Is there a USART enabled? */
#if defined(CONFIG_USART1_DISABLE) && defined(CONFIG_USART2_DISABLE) && defined(CONFIG_USART3_DISABLE)
# error "No USARTs enabled"
#endif
/* Is there a serial console? */
#if defined(CONFIG_USART1_SERIAL_CONSOLE) && !defined(CONFIG_USART1_DISABLE)
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && !defined(CONFIG_USART2_DISABLE)
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && !defined(CONFIG_USART3_DISABLE)
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#else
# warning "No valid CONFIG_USARTn_SERIAL_CONSOLE Setting"
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# undef HAVE_CONSOLE
#endif
/* If we are not using the serial driver for the console, then we still must
* provide some minimal implementation of up_putc.
*/
#ifdef CONFIG_USE_SERIALDRIVER
/* Which USART with be tty0/console and which tty1? */
#if defined(CONFIG_USART1_SERIAL_CONSOLE)
# define CONSOLE_DEV g_USART1port /* USART1 is console */
# define TTYS0_DEV g_USART1port /* USART1 is ttyS0 */
# ifndef CONFIG_USART2_DISABLE
# define TTYS1_DEV g_USART2port /* USART2 is ttyS1 */
# ifndef CONFIG_USART3_DISABLE
# define TTYS2_DEV g_USART3port /* USART3 is ttyS2 */
# else
# undef TTYS1_DEV /* No ttyS2 */
# endif
# else
# ifndef CONFIG_USART3_DISABLE
# define TTYS1_DEV g_USART3port /* USART3 is ttyS1 */
# else
# undef TTYS1_DEV /* No ttyS1 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# endif
#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define CONSOLE_DEV g_USART2port /* USART2 is console */
# define TTYS0_DEV g_USART2port /* USART2 is ttyS0 */
# ifndef CONFIG_USART1_DISABLE
# define TTYS1_DEV g_USART1port /* USART1 is ttyS1 */
# ifndef CONFIG_USART3_DISABLE
# define TTYS2_DEV g_USART3port /* USART3 is ttyS2 */
# else
# undef TTYS1_DEV /* No ttyS2 */
# endif
# else
# ifndef CONFIG_USART3_DISABLE
# define TTYS1_DEV g_USART3port /* USART3 is ttyS1 */
# else
# undef TTYS1_DEV /* No ttyS1 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# endif
#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
# define CONSOLE_DEV g_USART3port /* USART3 is console */
# define TTYS0_DEV g_USART3port /* USART3 is ttyS0 */
# ifndef CONFIG_USART1_DISABLE
# define TTYS1_DEV g_USART1port /* USART1 is ttyS1 */
# ifndef CONFIG_USART2_DISABLE
# define TTYS2_DEV g_USART2port /* USART2 is ttyS2 */
# else
# undef TTYS1_DEV /* No ttyS2 */
# endif
# else
# ifndef CONFIG_USART2_DISABLE
# define TTYS1_DEV g_USART2port /* USART2 is ttyS1 */
# else
# undef TTYS1_DEV /* No ttyS1 */
# endif
# undef TTYS2_DEV /* No ttyS2 */
# endif
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct up_dev_s
{
uint32 USARTbase; /* Base address of USART registers */
uint32 baud; /* Configured baud */
uint32 im; /* Saved IM value */
ubyte irq; /* IRQ associated with this USART */
ubyte parity; /* 0=none, 1=odd, 2=even */
ubyte bits; /* Number of bits (7 or 8) */
boolean stopbits2; /* TRUE: Configure with 2 stop bits instead of 1 */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static int up_setup(struct USART_dev_s *dev);
static void up_shutdown(struct USART_dev_s *dev);
static int up_attach(struct USART_dev_s *dev);
static void up_detach(struct USART_dev_s *dev);
static int up_interrupt(int irq, void *context);
static int up_ioctl(struct file *filep, int cmd, unsigned long arg);
static int up_receive(struct USART_dev_s *dev, uint32 *status);
static void up_rxint(struct USART_dev_s *dev, boolean enable);
static boolean up_rxavailable(struct USART_dev_s *dev);
static void up_send(struct USART_dev_s *dev, int ch);
static void up_txint(struct USART_dev_s *dev, boolean enable);
static boolean up_txready(struct USART_dev_s *dev);
static boolean up_txempty(struct USART_dev_s *dev);
/****************************************************************************
* Private Variables
****************************************************************************/
struct USART_ops_s g_USART_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,
.send = up_send,
.txint = up_txint,
.txready = up_txready,
.txempty = up_txempty,
};
/* I/O buffers */
#ifndef CONFIG_USART1_DISABLE
static char g_USART1rxbuffer[CONFIG_USART1_RXBUFSIZE];
static char g_USART1txbuffer[CONFIG_USART1_TXBUFSIZE];
#endif
#ifndef CONFIG_USART2_DISABLE
static char g_USART2rxbuffer[CONFIG_USART2_RXBUFSIZE];
static char g_USART2txbuffer[CONFIG_USART2_TXBUFSIZE];
#endif
#ifndef CONFIG_USART3_DISABLE
static char g_USART3rxbuffer[CONFIG_USART3_RXBUFSIZE];
static char g_USART3txbuffer[CONFIG_USART3_TXBUFSIZE];
#endif
/* This describes the state of the STM32 USART1 ports. */
#ifndef CONFIG_USART1_DISABLE
static struct up_dev_s g_USART1priv =
{
.USARTbase = STM32_USART1_BASE,
.baud = CONFIG_USART1_BAUD,
.irq = STM32_IRQ_USART1,
.parity = CONFIG_USART1_PARITY,
.bits = CONFIG_USART1_BITS,
.stopbits2 = CONFIG_USART1_2STOP,
};
static USART_dev_t g_USART1port =
{
.recv =
{
.size = CONFIG_USART1_RXBUFSIZE,
.buffer = g_USART1rxbuffer,
},
.xmit =
{
.size = CONFIG_USART1_TXBUFSIZE,
.buffer = g_USART1txbuffer,
},
.ops = &g_USART_ops,
.priv = &g_USART1priv,
};
#endif
/* This describes the state of the STM32 USART2 port. */
#ifndef CONFIG_USART2_DISABLE
static struct up_dev_s g_USART2priv =
{
.USARTbase = STM32_USART2_BASE,
.baud = CONFIG_USART2_BAUD,
.irq = STM32_IRQ_USART2,
.parity = CONFIG_USART2_PARITY,
.bits = CONFIG_USART2_BITS,
.stopbits2 = CONFIG_USART2_2STOP,
};
static USART_dev_t g_USART2port =
{
.recv =
{
.size = CONFIG_USART2_RXBUFSIZE,
.buffer = g_USART2rxbuffer,
},
.xmit =
{
.size = CONFIG_USART2_TXBUFSIZE,
.buffer = g_USART2txbuffer,
},
.ops = &g_USART_ops,
.priv = &g_USART2priv,
};
#endif
/* This describes the state of the STM32 USART3 port. */
#ifndef CONFIG_USART3_DISABLE
static struct up_dev_s g_USART3priv =
{
.USARTbase = STM32_USART3_BASE,
.baud = CONFIG_USART3_BAUD,
.irq = STM32_IRQ_USART3,
.parity = CONFIG_USART3_PARITY,
.bits = CONFIG_USART3_BITS,
.stopbits2 = CONFIG_USART3_2STOP,
};
static USART_dev_t g_USART3port =
{
.recv =
{
.size = CONFIG_USART3_RXBUFSIZE,
.buffer = g_USART3rxbuffer,
},
.xmit =
{
.size = CONFIG_USART3_TXBUFSIZE,
.buffer = g_USART3txbuffer,
},
.ops = &g_USART_ops,
.priv = &g_USART3priv,
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialin
****************************************************************************/
static inline uint32 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 value)
{
putreg32(value, priv->USARTbase + offset);
}
/****************************************************************************
* Name: up_disableusartint
****************************************************************************/
static inline void up_disableusartint(struct up_dev_s *priv, uint32 *im)
{
/* Return the current interrupt mask value */
if (im)
{
*im = priv->im;
}
/* Disable all interrupts */
priv->im = 0;
}
/****************************************************************************
* Name: up_restoreusartint
****************************************************************************/
static inline void up_restoreusartint(struct up_dev_s *priv, uint32 im)
{
priv->im = im;
}
/****************************************************************************
* Name: up_setup
*
* Description:
* Configure the USART baud, bits, parity, fifos, etc. This
* method is called the first time that the serial port is
* opened.
*
****************************************************************************/
static int up_setup(struct USART_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
/* Note: The logic here depends on the fact that that the USART module
* was enabled and the GPIOs were configured in up_lowsetup().
*/
/* Disable the USART */
/* Calculate BAUD rate from the SYS clock */
/* Set the USART to interrupt whenever the TX FIFO is almost empty or when
* any character is received.
*/
/* Flush the Rx and Tx FIFOs */
/* Enable Rx interrupts from the USART except for Tx interrupts. We don't want
* Tx interrupts until we have something to send. We will check for serial
* errors as part of Rx interrupt processing (no interrupts will be received
* yet because the interrupt is still disabled at the interrupt controller.
*/
/* Enable the FIFOs */
#ifdef CONFIG_SUPPRESS_USART_CONFIG
#endif
/* Enable Rx, Tx, and the USART */
#ifdef CONFIG_SUPPRESS_USART_CONFIG
#endif
/* Set up the cache IM value */
// priv->im =
return OK;
}
/****************************************************************************
* Name: up_shutdown
*
* Description:
* Disable the USART. This method is called when the serial
* port is closed
*
****************************************************************************/
static void up_shutdown(struct USART_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
up_disableusartint(priv, NULL);
}
/****************************************************************************
* 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 USART_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);
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 USART_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
* approprite USART_dev_s structure in order to call these functions.
*
****************************************************************************/
static int up_interrupt(int irq, void *context)
{
struct USART_dev_s *dev = NULL;
struct up_dev_s *priv;
int passes;
boolean handled;
#ifndef CONFIG_USART1_DISABLE
if (g_USART1priv.irq == irq)
{
dev = &g_USART1port;
}
else
#endif
#ifndef CONFIG_USART2_DISABLE
if (g_USART2priv.irq == irq)
{
dev = &g_USART2port;
}
else
#endif
#ifndef CONFIG_USART3_DISABLE
if (g_USART3priv.irq == irq)
{
dev = &g_USART3port;
}
else
#endif
{
PANIC(OSERR_INTERNAL);
}
priv = (struct up_dev_s*)dev->priv;
/* 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 and clear the pending interrupts. */
/* Handle incoming, receive bytes (with or without timeout) */
{
/* Rx buffer not empty ... process incoming bytes */
uart_recvchars(dev);
handled = TRUE;
}
/* Handle outgoing, transmit bytes */
{
/* Tx FIFO not full ... process outgoing bytes */
uart_xmitchars(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)
{
struct inode *inode = filep->f_inode;
struct USART_dev_s *dev = inode->i_private;
int ret = OK;
switch (cmd)
{
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;
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 USART_dev_s *dev, uint32 *status)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint32 rxd;
/* Get the Rx byte plux error information. Return those in status */
*status = rxd;
/* Then return the actual received byte */
return rxd & 0xff;
}
/****************************************************************************
* Name: up_rxint
*
* Description:
* Call to enable or disable RX interrupts
*
****************************************************************************/
static void up_rxint(struct USART_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
if (enable)
{
/* Receive an interrupt when their is anything in the Rx FIFO (or an Rx
* timeout occurs.
*/
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
// priv->im |= ;
#endif
}
else
{
// priv->im &= ~();
}
}
/****************************************************************************
* Name: up_rxavailable
*
* Description:
* Return TRUE if the receive fifo is not empty
*
****************************************************************************/
static boolean up_rxavailable(struct USART_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return 0;
}
/****************************************************************************
* Name: up_send
*
* Description:
* This method will send one byte on the USART
*
****************************************************************************/
static void up_send(struct USART_dev_s *dev, int ch)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
}
/****************************************************************************
* Name: up_txint
*
* Description:
* Call to enable or disable TX interrupts
*
****************************************************************************/
static void up_txint(struct USART_dev_s *dev, boolean enable)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
irqstate_t flags;
flags = irqsave();
if (enable)
{
/* Set to receive an interrupt when the TX fifo is half emptied */
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
// priv->im |= ;
up_serialout(priv, stm32_USART_IM_OFFSET, priv->im);
/* Fake a TX interrupt here by just calling uart_xmitchars() with
* interrupts disabled (note that the may recurse and that priv->im
* may be altered.
*/
uart_xmitchars(dev);
#endif
}
else
{
/* Disable the TX interrupt */
// priv->im &= ~();
}
irqrestore(flags);
}
/****************************************************************************
* Name: up_txready
*
* Description:
* Return TRUE if the tranmsit fifo is not full
*
****************************************************************************/
static boolean up_txready(struct USART_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return 0;
}
/****************************************************************************
* Name: up_txempty
*
* Description:
* Return TRUE if the transmit fifo is empty
*
****************************************************************************/
static boolean up_txempty(struct USART_dev_s *dev)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
return 0;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_serialinit
*
* 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.
*
****************************************************************************/
void up_earlyserialinit(void)
{
/* NOTE: All GPIO configuration for the USARTs was performed in
* up_lowsetup
*/
/* Disable all USARTS */
up_disableusartint(TTYS0_DEV.priv, NULL);
#ifdef TTYS1_DEV
up_disableusartint(TTYS1_DEV.priv, NULL);
#endif
#ifdef TTYS2_DEV
up_disableusartint(TTYS2_DEV.priv, NULL);
#endif
/* Configuration whichever one is the console */
#ifdef HAVE_CONSOLE
CONSOLE_DEV.isconsole = TRUE;
up_setup(&CONSOLE_DEV);
#endif
}
/****************************************************************************
* Name: up_serialinit
*
* Description:
* Register serial console and serial ports. This assumes
* that up_earlyserialinit was called previously.
*
****************************************************************************/
void up_serialinit(void)
{
/* Register the console */
#ifdef HAVE_CONSOLE
(void)usart_register("/dev/console", &CONSOLE_DEV);
#endif
/* Register all USARTs */
(void)usart_register("/dev/ttyS0", &TTYS0_DEV);
#ifdef TTYS1_DEV
(void)usart_register("/dev/ttyS1", &TTYS1_DEV);
#endif
#ifdef TTYS2_DEV
(void)usart_register("/dev/ttyS2", &TTYS2_DEV);
#endif
}
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_CONSOLE
struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv;
uint32 im;
up_disableusartint(priv, &im);
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
up_restoreusartint(priv, im);
#endif
return ch;
}
#else /* CONFIG_USE_SERIALDRIVER */
/****************************************************************************
* Name: up_putc
*
* Description:
* Provide priority, low-level access to support OS debug writes
*
****************************************************************************/
int up_putc(int ch)
{
#ifdef HAVE_CONSOLE
/* Check for LF */
if (ch == '\n')
{
/* Add CR */
up_lowputc('\r');
}
up_lowputc(ch);
#endif
return ch;
}
#endif /* CONFIG_USE_SERIALDRIVER */