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rt-thread-official/components/drivers/serial/serial.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2006-03-13 bernard first version
* 2012-05-15 lgnq modified according bernard's implementation.
* 2012-05-28 bernard code cleanup
* 2012-11-23 bernard fix compiler warning.
* 2013-02-20 bernard use RT_SERIAL_RB_BUFSZ to define
* the size of ring buffer.
* 2014-07-10 bernard rewrite serial framework
* 2014-12-31 bernard use open_flag for poll_tx stream mode.
* 2015-05-19 Quintin fix DMA tx mod tx_dma->activated flag !=RT_FALSE BUG
* in open function.
* 2015-11-10 bernard fix the poll rx issue when there is no data.
* 2016-05-10 armink add fifo mode to DMA rx when serial->config.bufsz != 0.
* 2017-01-19 aubr.cool prevent change serial rx bufsz when serial is opened.
* 2017-11-07 JasonJia fix data bits error issue when using tcsetattr.
* 2017-11-15 JasonJia fix poll rx issue when data is full.
* add TCFLSH and FIONREAD support.
* 2018-12-08 Ernest Chen add DMA choice
* 2020-09-14 WillianChan add a line feed to the carriage return character
* when using interrupt tx
* 2020-12-14 Meco Man add function of setting window's size(TIOCSWINSZ)
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "UART"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#ifdef RT_USING_POSIX
#include <dfs_posix.h>
#include <dfs_poll.h>
#ifdef RT_USING_POSIX_TERMIOS
#include <posix_termios.h>
#endif
/* it's possible the 'getc/putc' is defined by stdio.h in gcc/newlib. */
#ifdef getc
#undef getc
#endif
#ifdef putc
#undef putc
#endif
static rt_err_t serial_fops_rx_ind(rt_device_t dev, rt_size_t size)
{
rt_wqueue_wakeup(&(dev->wait_queue), (void*)POLLIN);
return RT_EOK;
}
/* fops for serial */
static int serial_fops_open(struct dfs_fd *fd)
{
rt_err_t ret = 0;
rt_uint16_t flags = 0;
rt_device_t device;
device = (rt_device_t)fd->data;
RT_ASSERT(device != RT_NULL);
switch (fd->flags & O_ACCMODE)
{
case O_RDONLY:
LOG_D("fops open: O_RDONLY!");
flags = RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_RDONLY;
break;
case O_WRONLY:
LOG_D("fops open: O_WRONLY!");
flags = RT_DEVICE_FLAG_WRONLY;
break;
case O_RDWR:
LOG_D("fops open: O_RDWR!");
flags = RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_RDWR;
break;
default:
LOG_E("fops open: unknown mode - %d!", fd->flags & O_ACCMODE);
break;
}
if ((fd->flags & O_ACCMODE) != O_WRONLY)
rt_device_set_rx_indicate(device, serial_fops_rx_ind);
ret = rt_device_open(device, flags);
if (ret == RT_EOK) return 0;
return ret;
}
static int serial_fops_close(struct dfs_fd *fd)
{
rt_device_t device;
device = (rt_device_t)fd->data;
rt_device_set_rx_indicate(device, RT_NULL);
rt_device_close(device);
return 0;
}
static int serial_fops_ioctl(struct dfs_fd *fd, int cmd, void *args)
{
rt_device_t device;
device = (rt_device_t)fd->data;
switch (cmd)
{
case FIONREAD:
break;
case FIONWRITE:
break;
}
return rt_device_control(device, cmd, args);
}
static int serial_fops_read(struct dfs_fd *fd, void *buf, size_t count)
{
int size = 0;
rt_device_t device;
device = (rt_device_t)fd->data;
do
{
size = rt_device_read(device, -1, buf, count);
if (size <= 0)
{
if (fd->flags & O_NONBLOCK)
{
size = -EAGAIN;
break;
}
rt_wqueue_wait(&(device->wait_queue), 0, RT_WAITING_FOREVER);
}
}while (size <= 0);
return size;
}
static int serial_fops_write(struct dfs_fd *fd, const void *buf, size_t count)
{
rt_device_t device;
device = (rt_device_t)fd->data;
return rt_device_write(device, -1, buf, count);
}
static int serial_fops_poll(struct dfs_fd *fd, struct rt_pollreq *req)
{
int mask = 0;
int flags = 0;
rt_device_t device;
struct rt_serial_device *serial;
device = (rt_device_t)fd->data;
RT_ASSERT(device != RT_NULL);
serial = (struct rt_serial_device *)device;
/* only support POLLIN */
flags = fd->flags & O_ACCMODE;
if (flags == O_RDONLY || flags == O_RDWR)
{
rt_base_t level;
struct rt_serial_rx_fifo* rx_fifo;
rt_poll_add(&(device->wait_queue), req);
rx_fifo = (struct rt_serial_rx_fifo*) serial->serial_rx;
level = rt_hw_interrupt_disable();
if ((rx_fifo->get_index != rx_fifo->put_index) || (rx_fifo->get_index == rx_fifo->put_index && rx_fifo->is_full == RT_TRUE))
mask |= POLLIN;
rt_hw_interrupt_enable(level);
}
return mask;
}
const static struct dfs_file_ops _serial_fops =
{
serial_fops_open,
serial_fops_close,
serial_fops_ioctl,
serial_fops_read,
serial_fops_write,
RT_NULL, /* flush */
RT_NULL, /* lseek */
RT_NULL, /* getdents */
serial_fops_poll,
};
#endif
/*
* Serial poll routines
*/
rt_inline int _serial_poll_rx(struct rt_serial_device *serial, rt_uint8_t *data, int length)
{
int ch;
int size;
RT_ASSERT(serial != RT_NULL);
size = length;
while (length)
{
ch = serial->ops->getc(serial);
if (ch == -1) break;
*data = ch;
data ++; length --;
if(serial->parent.open_flag & RT_DEVICE_FLAG_STREAM)
{
if (ch == '\n') break;
}
}
return size - length;
}
rt_inline int _serial_poll_tx(struct rt_serial_device *serial, const rt_uint8_t *data, int length)
{
int size;
RT_ASSERT(serial != RT_NULL);
size = length;
while (length)
{
/*
* to be polite with serial console add a line feed
* to the carriage return character
*/
if (*data == '\n' && (serial->parent.open_flag & RT_DEVICE_FLAG_STREAM))
{
serial->ops->putc(serial, '\r');
}
serial->ops->putc(serial, *data);
++ data;
-- length;
}
return size - length;
}
/*
* Serial interrupt routines
*/
rt_inline int _serial_int_rx(struct rt_serial_device *serial, rt_uint8_t *data, int length)
{
int size;
struct rt_serial_rx_fifo* rx_fifo;
RT_ASSERT(serial != RT_NULL);
size = length;
rx_fifo = (struct rt_serial_rx_fifo*) serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
/* read from software FIFO */
while (length)
{
int ch;
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* there's no data: */
if ((rx_fifo->get_index == rx_fifo->put_index) && (rx_fifo->is_full == RT_FALSE))
{
/* no data, enable interrupt and break out */
rt_hw_interrupt_enable(level);
break;
}
/* otherwise there's the data: */
ch = rx_fifo->buffer[rx_fifo->get_index];
rx_fifo->get_index += 1;
if (rx_fifo->get_index >= serial->config.bufsz) rx_fifo->get_index = 0;
if (rx_fifo->is_full == RT_TRUE)
{
rx_fifo->is_full = RT_FALSE;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
*data = ch & 0xff;
data ++; length --;
}
return size - length;
}
rt_inline int _serial_int_tx(struct rt_serial_device *serial, const rt_uint8_t *data, int length)
{
int size;
struct rt_serial_tx_fifo *tx;
RT_ASSERT(serial != RT_NULL);
size = length;
tx = (struct rt_serial_tx_fifo*) serial->serial_tx;
RT_ASSERT(tx != RT_NULL);
while (length)
{
/*
* to be polite with serial console add a line feed
* to the carriage return character
*/
if (*data == '\n' && (serial->parent.open_flag & RT_DEVICE_FLAG_STREAM))
{
if (serial->ops->putc(serial, '\r') == -1)
{
rt_completion_wait(&(tx->completion), RT_WAITING_FOREVER);
continue;
}
}
if (serial->ops->putc(serial, *(char*)data) == -1)
{
rt_completion_wait(&(tx->completion), RT_WAITING_FOREVER);
continue;
}
data ++; length --;
}
return size - length;
}
static void _serial_check_buffer_size(void)
{
static rt_bool_t already_output = RT_FALSE;
if (already_output == RT_FALSE)
{
#if !defined(RT_USING_ULOG) || defined(ULOG_USING_ISR_LOG)
LOG_W("Warning: There is no enough buffer for saving data,"
" please increase the RT_SERIAL_RB_BUFSZ option.");
#endif
already_output = RT_TRUE;
}
}
#if defined(RT_USING_POSIX) || defined(RT_SERIAL_USING_DMA)
static rt_size_t _serial_fifo_calc_recved_len(struct rt_serial_device *serial)
{
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
if (rx_fifo->put_index == rx_fifo->get_index)
{
return (rx_fifo->is_full == RT_FALSE ? 0 : serial->config.bufsz);
}
else
{
if (rx_fifo->put_index > rx_fifo->get_index)
{
return rx_fifo->put_index - rx_fifo->get_index;
}
else
{
return serial->config.bufsz - (rx_fifo->get_index - rx_fifo->put_index);
}
}
}
#endif /* RT_USING_POSIX || RT_SERIAL_USING_DMA */
#ifdef RT_SERIAL_USING_DMA
/**
* Calculate DMA received data length.
*
* @param serial serial device
*
* @return length
*/
static rt_size_t rt_dma_calc_recved_len(struct rt_serial_device *serial)
{
return _serial_fifo_calc_recved_len(serial);
}
/**
* Read data finish by DMA mode then update the get index for receive fifo.
*
* @param serial serial device
* @param len get data length for this operate
*/
static void rt_dma_recv_update_get_index(struct rt_serial_device *serial, rt_size_t len)
{
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
RT_ASSERT(len <= rt_dma_calc_recved_len(serial));
if (rx_fifo->is_full && len != 0) rx_fifo->is_full = RT_FALSE;
rx_fifo->get_index += len;
if (rx_fifo->get_index >= serial->config.bufsz)
{
rx_fifo->get_index %= serial->config.bufsz;
}
}
/**
* DMA received finish then update put index for receive fifo.
*
* @param serial serial device
* @param len received length for this transmit
*/
static void rt_dma_recv_update_put_index(struct rt_serial_device *serial, rt_size_t len)
{
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
if (rx_fifo->get_index <= rx_fifo->put_index)
{
rx_fifo->put_index += len;
/* beyond the fifo end */
if (rx_fifo->put_index >= serial->config.bufsz)
{
rx_fifo->put_index %= serial->config.bufsz;
/* force overwrite get index */
if (rx_fifo->put_index >= rx_fifo->get_index)
{
rx_fifo->is_full = RT_TRUE;
}
}
}
else
{
rx_fifo->put_index += len;
if (rx_fifo->put_index >= rx_fifo->get_index)
{
/* beyond the fifo end */
if (rx_fifo->put_index >= serial->config.bufsz)
{
rx_fifo->put_index %= serial->config.bufsz;
}
/* force overwrite get index */
rx_fifo->is_full = RT_TRUE;
}
}
if(rx_fifo->is_full == RT_TRUE)
{
_serial_check_buffer_size();
rx_fifo->get_index = rx_fifo->put_index;
}
}
/*
* Serial DMA routines
*/
rt_inline int _serial_dma_rx(struct rt_serial_device *serial, rt_uint8_t *data, int length)
{
rt_base_t level;
RT_ASSERT((serial != RT_NULL) && (data != RT_NULL));
level = rt_hw_interrupt_disable();
if (serial->config.bufsz == 0)
{
int result = RT_EOK;
struct rt_serial_rx_dma *rx_dma;
rx_dma = (struct rt_serial_rx_dma*)serial->serial_rx;
RT_ASSERT(rx_dma != RT_NULL);
if (rx_dma->activated != RT_TRUE)
{
rx_dma->activated = RT_TRUE;
RT_ASSERT(serial->ops->dma_transmit != RT_NULL);
serial->ops->dma_transmit(serial, data, length, RT_SERIAL_DMA_RX);
}
else result = -RT_EBUSY;
rt_hw_interrupt_enable(level);
if (result == RT_EOK) return length;
rt_set_errno(result);
return 0;
}
else
{
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
rt_size_t recv_len = 0, fifo_recved_len = rt_dma_calc_recved_len(serial);
RT_ASSERT(rx_fifo != RT_NULL);
if (length < (int)fifo_recved_len)
recv_len = length;
else
recv_len = fifo_recved_len;
if (rx_fifo->get_index + recv_len < serial->config.bufsz)
rt_memcpy(data, rx_fifo->buffer + rx_fifo->get_index, recv_len);
else
{
rt_memcpy(data, rx_fifo->buffer + rx_fifo->get_index,
serial->config.bufsz - rx_fifo->get_index);
rt_memcpy(data + serial->config.bufsz - rx_fifo->get_index, rx_fifo->buffer,
recv_len + rx_fifo->get_index - serial->config.bufsz);
}
rt_dma_recv_update_get_index(serial, recv_len);
rt_hw_interrupt_enable(level);
return recv_len;
}
}
rt_inline int _serial_dma_tx(struct rt_serial_device *serial, const rt_uint8_t *data, int length)
{
rt_base_t level;
rt_err_t result;
struct rt_serial_tx_dma *tx_dma;
tx_dma = (struct rt_serial_tx_dma*)(serial->serial_tx);
result = rt_data_queue_push(&(tx_dma->data_queue), data, length, RT_WAITING_FOREVER);
if (result == RT_EOK)
{
level = rt_hw_interrupt_disable();
if (tx_dma->activated != RT_TRUE)
{
tx_dma->activated = RT_TRUE;
rt_hw_interrupt_enable(level);
/* make a DMA transfer */
serial->ops->dma_transmit(serial, (rt_uint8_t *)data, length, RT_SERIAL_DMA_TX);
}
else
{
rt_hw_interrupt_enable(level);
}
return length;
}
else
{
rt_set_errno(result);
return 0;
}
}
#endif /* RT_SERIAL_USING_DMA */
/* RT-Thread Device Interface */
/*
* This function initializes serial device.
*/
static rt_err_t rt_serial_init(struct rt_device *dev)
{
rt_err_t result = RT_EOK;
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
serial = (struct rt_serial_device *)dev;
/* initialize rx/tx */
serial->serial_rx = RT_NULL;
serial->serial_tx = RT_NULL;
/* apply configuration */
if (serial->ops->configure)
result = serial->ops->configure(serial, &serial->config);
return result;
}
static rt_err_t rt_serial_open(struct rt_device *dev, rt_uint16_t oflag)
{
rt_uint16_t stream_flag = 0;
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
serial = (struct rt_serial_device *)dev;
LOG_D("open serial device: 0x%08x with open flag: 0x%04x",
dev, oflag);
/* check device flag with the open flag */
if ((oflag & RT_DEVICE_FLAG_DMA_RX) && !(dev->flag & RT_DEVICE_FLAG_DMA_RX))
return -RT_EIO;
if ((oflag & RT_DEVICE_FLAG_DMA_TX) && !(dev->flag & RT_DEVICE_FLAG_DMA_TX))
return -RT_EIO;
if ((oflag & RT_DEVICE_FLAG_INT_RX) && !(dev->flag & RT_DEVICE_FLAG_INT_RX))
return -RT_EIO;
if ((oflag & RT_DEVICE_FLAG_INT_TX) && !(dev->flag & RT_DEVICE_FLAG_INT_TX))
return -RT_EIO;
/* keep steam flag */
if ((oflag & RT_DEVICE_FLAG_STREAM) || (dev->open_flag & RT_DEVICE_FLAG_STREAM))
stream_flag = RT_DEVICE_FLAG_STREAM;
/* get open flags */
dev->open_flag = oflag & 0xff;
/* initialize the Rx/Tx structure according to open flag */
if (serial->serial_rx == RT_NULL)
{
if (oflag & RT_DEVICE_FLAG_INT_RX)
{
struct rt_serial_rx_fifo* rx_fifo;
rx_fifo = (struct rt_serial_rx_fifo*) rt_malloc (sizeof(struct rt_serial_rx_fifo) +
serial->config.bufsz);
RT_ASSERT(rx_fifo != RT_NULL);
rx_fifo->buffer = (rt_uint8_t*) (rx_fifo + 1);
rt_memset(rx_fifo->buffer, 0, serial->config.bufsz);
rx_fifo->put_index = 0;
rx_fifo->get_index = 0;
rx_fifo->is_full = RT_FALSE;
serial->serial_rx = rx_fifo;
dev->open_flag |= RT_DEVICE_FLAG_INT_RX;
/* configure low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_SET_INT, (void *)RT_DEVICE_FLAG_INT_RX);
}
#ifdef RT_SERIAL_USING_DMA
else if (oflag & RT_DEVICE_FLAG_DMA_RX)
{
if (serial->config.bufsz == 0) {
struct rt_serial_rx_dma* rx_dma;
rx_dma = (struct rt_serial_rx_dma*) rt_malloc (sizeof(struct rt_serial_rx_dma));
RT_ASSERT(rx_dma != RT_NULL);
rx_dma->activated = RT_FALSE;
serial->serial_rx = rx_dma;
} else {
struct rt_serial_rx_fifo* rx_fifo;
rx_fifo = (struct rt_serial_rx_fifo*) rt_malloc (sizeof(struct rt_serial_rx_fifo) +
serial->config.bufsz);
RT_ASSERT(rx_fifo != RT_NULL);
rx_fifo->buffer = (rt_uint8_t*) (rx_fifo + 1);
rt_memset(rx_fifo->buffer, 0, serial->config.bufsz);
rx_fifo->put_index = 0;
rx_fifo->get_index = 0;
rx_fifo->is_full = RT_FALSE;
serial->serial_rx = rx_fifo;
/* configure fifo address and length to low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_CONFIG, (void *) RT_DEVICE_FLAG_DMA_RX);
}
dev->open_flag |= RT_DEVICE_FLAG_DMA_RX;
}
#endif /* RT_SERIAL_USING_DMA */
else
{
serial->serial_rx = RT_NULL;
}
}
else
{
if (oflag & RT_DEVICE_FLAG_INT_RX)
dev->open_flag |= RT_DEVICE_FLAG_INT_RX;
#ifdef RT_SERIAL_USING_DMA
else if (oflag & RT_DEVICE_FLAG_DMA_RX)
dev->open_flag |= RT_DEVICE_FLAG_DMA_RX;
#endif /* RT_SERIAL_USING_DMA */
}
if (serial->serial_tx == RT_NULL)
{
if (oflag & RT_DEVICE_FLAG_INT_TX)
{
struct rt_serial_tx_fifo *tx_fifo;
tx_fifo = (struct rt_serial_tx_fifo*) rt_malloc(sizeof(struct rt_serial_tx_fifo));
RT_ASSERT(tx_fifo != RT_NULL);
rt_completion_init(&(tx_fifo->completion));
serial->serial_tx = tx_fifo;
dev->open_flag |= RT_DEVICE_FLAG_INT_TX;
/* configure low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_SET_INT, (void *)RT_DEVICE_FLAG_INT_TX);
}
#ifdef RT_SERIAL_USING_DMA
else if (oflag & RT_DEVICE_FLAG_DMA_TX)
{
struct rt_serial_tx_dma* tx_dma;
tx_dma = (struct rt_serial_tx_dma*) rt_malloc (sizeof(struct rt_serial_tx_dma));
RT_ASSERT(tx_dma != RT_NULL);
tx_dma->activated = RT_FALSE;
rt_data_queue_init(&(tx_dma->data_queue), 8, 4, RT_NULL);
serial->serial_tx = tx_dma;
dev->open_flag |= RT_DEVICE_FLAG_DMA_TX;
/* configure low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_CONFIG, (void *)RT_DEVICE_FLAG_DMA_TX);
}
#endif /* RT_SERIAL_USING_DMA */
else
{
serial->serial_tx = RT_NULL;
}
}
else
{
if (oflag & RT_DEVICE_FLAG_INT_TX)
dev->open_flag |= RT_DEVICE_FLAG_INT_TX;
#ifdef RT_SERIAL_USING_DMA
else if (oflag & RT_DEVICE_FLAG_DMA_TX)
dev->open_flag |= RT_DEVICE_FLAG_DMA_TX;
#endif /* RT_SERIAL_USING_DMA */
}
/* set stream flag */
dev->open_flag |= stream_flag;
return RT_EOK;
}
static rt_err_t rt_serial_close(struct rt_device *dev)
{
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
serial = (struct rt_serial_device *)dev;
/* this device has more reference count */
if (dev->ref_count > 1) return RT_EOK;
if (dev->open_flag & RT_DEVICE_FLAG_INT_RX)
{
struct rt_serial_rx_fifo* rx_fifo;
/* configure low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_CLR_INT, (void*)RT_DEVICE_FLAG_INT_RX);
dev->open_flag &= ~RT_DEVICE_FLAG_INT_RX;
rx_fifo = (struct rt_serial_rx_fifo*)serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
rt_free(rx_fifo);
serial->serial_rx = RT_NULL;
}
#ifdef RT_SERIAL_USING_DMA
else if (dev->open_flag & RT_DEVICE_FLAG_DMA_RX)
{
/* configure low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_CLR_INT, (void *) RT_DEVICE_FLAG_DMA_RX);
dev->open_flag &= ~RT_DEVICE_FLAG_DMA_RX;
if (serial->config.bufsz == 0)
{
struct rt_serial_rx_dma* rx_dma;
rx_dma = (struct rt_serial_rx_dma*)serial->serial_rx;
RT_ASSERT(rx_dma != RT_NULL);
rt_free(rx_dma);
}
else
{
struct rt_serial_rx_fifo* rx_fifo;
rx_fifo = (struct rt_serial_rx_fifo*)serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
rt_free(rx_fifo);
}
serial->serial_rx = RT_NULL;
}
#endif /* RT_SERIAL_USING_DMA */
if (dev->open_flag & RT_DEVICE_FLAG_INT_TX)
{
struct rt_serial_tx_fifo* tx_fifo;
serial->ops->control(serial, RT_DEVICE_CTRL_CLR_INT, (void*)RT_DEVICE_FLAG_INT_TX);
dev->open_flag &= ~RT_DEVICE_FLAG_INT_TX;
tx_fifo = (struct rt_serial_tx_fifo*)serial->serial_tx;
RT_ASSERT(tx_fifo != RT_NULL);
rt_free(tx_fifo);
serial->serial_tx = RT_NULL;
/* configure low level device */
}
#ifdef RT_SERIAL_USING_DMA
else if (dev->open_flag & RT_DEVICE_FLAG_DMA_TX)
{
struct rt_serial_tx_dma* tx_dma;
/* configure low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_CLR_INT, (void *) RT_DEVICE_FLAG_DMA_TX);
dev->open_flag &= ~RT_DEVICE_FLAG_DMA_TX;
tx_dma = (struct rt_serial_tx_dma*)serial->serial_tx;
RT_ASSERT(tx_dma != RT_NULL);
rt_data_queue_deinit(&(tx_dma->data_queue));
rt_free(tx_dma);
serial->serial_tx = RT_NULL;
}
#endif /* RT_SERIAL_USING_DMA */
serial->ops->control(serial, RT_DEVICE_CTRL_CLOSE, RT_NULL);
dev->flag &= ~RT_DEVICE_FLAG_ACTIVATED;
return RT_EOK;
}
static rt_size_t rt_serial_read(struct rt_device *dev,
rt_off_t pos,
void *buffer,
rt_size_t size)
{
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
if (size == 0) return 0;
serial = (struct rt_serial_device *)dev;
if (dev->open_flag & RT_DEVICE_FLAG_INT_RX)
{
return _serial_int_rx(serial, (rt_uint8_t *)buffer, size);
}
#ifdef RT_SERIAL_USING_DMA
else if (dev->open_flag & RT_DEVICE_FLAG_DMA_RX)
{
return _serial_dma_rx(serial, (rt_uint8_t *)buffer, size);
}
#endif /* RT_SERIAL_USING_DMA */
return _serial_poll_rx(serial, (rt_uint8_t *)buffer, size);
}
static rt_size_t rt_serial_write(struct rt_device *dev,
rt_off_t pos,
const void *buffer,
rt_size_t size)
{
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
if (size == 0) return 0;
serial = (struct rt_serial_device *)dev;
if (dev->open_flag & RT_DEVICE_FLAG_INT_TX)
{
return _serial_int_tx(serial, (const rt_uint8_t *)buffer, size);
}
#ifdef RT_SERIAL_USING_DMA
else if (dev->open_flag & RT_DEVICE_FLAG_DMA_TX)
{
return _serial_dma_tx(serial, (const rt_uint8_t *)buffer, size);
}
#endif /* RT_SERIAL_USING_DMA */
else
{
return _serial_poll_tx(serial, (const rt_uint8_t *)buffer, size);
}
}
#ifdef RT_USING_POSIX_TERMIOS
struct speed_baudrate_item
{
speed_t speed;
int baudrate;
};
const static struct speed_baudrate_item _tbl[] =
{
{B2400, BAUD_RATE_2400},
{B4800, BAUD_RATE_4800},
{B9600, BAUD_RATE_9600},
{B19200, BAUD_RATE_19200},
{B38400, BAUD_RATE_38400},
{B57600, BAUD_RATE_57600},
{B115200, BAUD_RATE_115200},
{B230400, BAUD_RATE_230400},
{B460800, BAUD_RATE_460800},
{B921600, BAUD_RATE_921600},
{B2000000, BAUD_RATE_2000000},
{B3000000, BAUD_RATE_3000000},
};
static speed_t _get_speed(int baudrate)
{
int index;
for (index = 0; index < sizeof(_tbl)/sizeof(_tbl[0]); index ++)
{
if (_tbl[index].baudrate == baudrate)
return _tbl[index].speed;
}
return B0;
}
static int _get_baudrate(speed_t speed)
{
int index;
for (index = 0; index < sizeof(_tbl)/sizeof(_tbl[0]); index ++)
{
if (_tbl[index].speed == speed)
return _tbl[index].baudrate;
}
return 0;
}
static void _tc_flush(struct rt_serial_device *serial, int queue)
{
rt_base_t level;
int ch = -1;
struct rt_serial_rx_fifo *rx_fifo = RT_NULL;
struct rt_device *device = RT_NULL;
RT_ASSERT(serial != RT_NULL);
device = &(serial->parent);
rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
switch(queue)
{
case TCIFLUSH:
case TCIOFLUSH:
RT_ASSERT(rx_fifo != RT_NULL);
if((device->open_flag & RT_DEVICE_FLAG_INT_RX) || (device->open_flag & RT_DEVICE_FLAG_DMA_RX))
{
RT_ASSERT(RT_NULL != rx_fifo);
level = rt_hw_interrupt_disable();
rt_memset(rx_fifo->buffer, 0, serial->config.bufsz);
rx_fifo->put_index = 0;
rx_fifo->get_index = 0;
rx_fifo->is_full = RT_FALSE;
rt_hw_interrupt_enable(level);
}
else
{
while (1)
{
ch = serial->ops->getc(serial);
if (ch == -1) break;
}
}
break;
case TCOFLUSH:
break;
}
}
#endif
static rt_err_t rt_serial_control(struct rt_device *dev,
int cmd,
void *args)
{
rt_err_t ret = RT_EOK;
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
serial = (struct rt_serial_device *)dev;
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
break;
case RT_DEVICE_CTRL_RESUME:
/* resume device */
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
break;
case RT_DEVICE_CTRL_CONFIG:
if (args)
{
struct serial_configure *pconfig = (struct serial_configure *) args;
if (pconfig->bufsz != serial->config.bufsz && serial->parent.ref_count)
{
/*can not change buffer size*/
return RT_EBUSY;
}
/* set serial configure */
serial->config = *pconfig;
if (serial->parent.ref_count)
{
/* serial device has been opened, to configure it */
serial->ops->configure(serial, (struct serial_configure *) args);
}
}
break;
#ifdef RT_USING_POSIX
#ifdef RT_USING_POSIX_TERMIOS
case TCGETA:
{
struct termios *tio = (struct termios*)args;
if (tio == RT_NULL) return -RT_EINVAL;
tio->c_iflag = 0;
tio->c_oflag = 0;
tio->c_lflag = 0;
/* update oflag for console device */
if (rt_console_get_device() == dev)
tio->c_oflag = OPOST | ONLCR;
/* set cflag */
tio->c_cflag = 0;
if (serial->config.data_bits == DATA_BITS_5)
tio->c_cflag = CS5;
else if (serial->config.data_bits == DATA_BITS_6)
tio->c_cflag = CS6;
else if (serial->config.data_bits == DATA_BITS_7)
tio->c_cflag = CS7;
else if (serial->config.data_bits == DATA_BITS_8)
tio->c_cflag = CS8;
if (serial->config.stop_bits == STOP_BITS_2)
tio->c_cflag |= CSTOPB;
if (serial->config.parity == PARITY_EVEN)
tio->c_cflag |= PARENB;
else if (serial->config.parity == PARITY_ODD)
tio->c_cflag |= (PARODD | PARENB);
cfsetospeed(tio, _get_speed(serial->config.baud_rate));
}
break;
case TCSETAW:
case TCSETAF:
case TCSETA:
{
int baudrate;
struct serial_configure config;
struct termios *tio = (struct termios*)args;
if (tio == RT_NULL) return -RT_EINVAL;
config = serial->config;
baudrate = _get_baudrate(cfgetospeed(tio));
config.baud_rate = baudrate;
switch (tio->c_cflag & CSIZE)
{
case CS5:
config.data_bits = DATA_BITS_5;
break;
case CS6:
config.data_bits = DATA_BITS_6;
break;
case CS7:
config.data_bits = DATA_BITS_7;
break;
default:
config.data_bits = DATA_BITS_8;
break;
}
if (tio->c_cflag & CSTOPB) config.stop_bits = STOP_BITS_2;
else config.stop_bits = STOP_BITS_1;
if (tio->c_cflag & PARENB)
{
if (tio->c_cflag & PARODD) config.parity = PARITY_ODD;
else config.parity = PARITY_EVEN;
}
else config.parity = PARITY_NONE;
serial->ops->configure(serial, &config);
}
break;
case TCFLSH:
{
int queue = (int)args;
_tc_flush(serial, queue);
}
break;
case TCXONC:
break;
case TIOCSWINSZ:
{
struct winsize* p_winsize;
p_winsize = (struct winsize*)args;
rt_kprintf("\x1b[8;%d;%dt", p_winsize->ws_col, p_winsize->ws_row);
}
break;
case TIOCGWINSZ:
{
struct winsize* p_winsize;
p_winsize = (struct winsize*)args;
/* TODO: get windows size from console */
p_winsize->ws_col = 80;
p_winsize->ws_row = 24;
p_winsize->ws_xpixel = 0;/*unused*/
p_winsize->ws_ypixel = 0;/*unused*/
}
break;
#endif /*RT_USING_POSIX_TERMIOS*/
case FIONREAD:
{
rt_size_t recved = 0;
rt_base_t level;
level = rt_hw_interrupt_disable();
recved = _serial_fifo_calc_recved_len(serial);
rt_hw_interrupt_enable(level);
*(rt_size_t *)args = recved;
}
break;
#endif /*RT_USING_POSIX*/
default :
/* control device */
ret = serial->ops->control(serial, cmd, args);
break;
}
return ret;
}
#ifdef RT_USING_DEVICE_OPS
const static struct rt_device_ops serial_ops =
{
rt_serial_init,
rt_serial_open,
rt_serial_close,
rt_serial_read,
rt_serial_write,
rt_serial_control
};
#endif
/*
* serial register
*/
rt_err_t rt_hw_serial_register(struct rt_serial_device *serial,
const char *name,
rt_uint32_t flag,
void *data)
{
rt_err_t ret;
struct rt_device *device;
RT_ASSERT(serial != RT_NULL);
device = &(serial->parent);
device->type = RT_Device_Class_Char;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
#ifdef RT_USING_DEVICE_OPS
device->ops = &serial_ops;
#else
device->init = rt_serial_init;
device->open = rt_serial_open;
device->close = rt_serial_close;
device->read = rt_serial_read;
device->write = rt_serial_write;
device->control = rt_serial_control;
#endif
device->user_data = data;
/* register a character device */
ret = rt_device_register(device, name, flag);
#if defined(RT_USING_POSIX)
/* set fops */
device->fops = &_serial_fops;
#endif
return ret;
}
/* ISR for serial interrupt */
void rt_hw_serial_isr(struct rt_serial_device *serial, int event)
{
switch (event & 0xff)
{
case RT_SERIAL_EVENT_RX_IND:
{
int ch = -1;
rt_base_t level;
struct rt_serial_rx_fifo* rx_fifo;
/* interrupt mode receive */
rx_fifo = (struct rt_serial_rx_fifo*)serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
while (1)
{
ch = serial->ops->getc(serial);
if (ch == -1) break;
/* disable interrupt */
level = rt_hw_interrupt_disable();
rx_fifo->buffer[rx_fifo->put_index] = ch;
rx_fifo->put_index += 1;
if (rx_fifo->put_index >= serial->config.bufsz) rx_fifo->put_index = 0;
/* if the next position is read index, discard this 'read char' */
if (rx_fifo->put_index == rx_fifo->get_index)
{
rx_fifo->get_index += 1;
rx_fifo->is_full = RT_TRUE;
if (rx_fifo->get_index >= serial->config.bufsz) rx_fifo->get_index = 0;
_serial_check_buffer_size();
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
/* invoke callback */
if (serial->parent.rx_indicate != RT_NULL)
{
rt_size_t rx_length;
/* get rx length */
level = rt_hw_interrupt_disable();
rx_length = (rx_fifo->put_index >= rx_fifo->get_index)? (rx_fifo->put_index - rx_fifo->get_index):
(serial->config.bufsz - (rx_fifo->get_index - rx_fifo->put_index));
rt_hw_interrupt_enable(level);
if (rx_length)
{
serial->parent.rx_indicate(&serial->parent, rx_length);
}
}
break;
}
case RT_SERIAL_EVENT_TX_DONE:
{
struct rt_serial_tx_fifo* tx_fifo;
tx_fifo = (struct rt_serial_tx_fifo*)serial->serial_tx;
rt_completion_done(&(tx_fifo->completion));
break;
}
#ifdef RT_SERIAL_USING_DMA
case RT_SERIAL_EVENT_TX_DMADONE:
{
const void *data_ptr;
rt_size_t data_size;
const void *last_data_ptr;
struct rt_serial_tx_dma *tx_dma;
tx_dma = (struct rt_serial_tx_dma*) serial->serial_tx;
rt_data_queue_pop(&(tx_dma->data_queue), &last_data_ptr, &data_size, 0);
if (rt_data_queue_peek(&(tx_dma->data_queue), &data_ptr, &data_size) == RT_EOK)
{
/* transmit next data node */
tx_dma->activated = RT_TRUE;
serial->ops->dma_transmit(serial, (rt_uint8_t *)data_ptr, data_size, RT_SERIAL_DMA_TX);
}
else
{
tx_dma->activated = RT_FALSE;
}
/* invoke callback */
if (serial->parent.tx_complete != RT_NULL)
{
serial->parent.tx_complete(&serial->parent, (void*)last_data_ptr);
}
break;
}
case RT_SERIAL_EVENT_RX_DMADONE:
{
int length;
rt_base_t level;
/* get DMA rx length */
length = (event & (~0xff)) >> 8;
if (serial->config.bufsz == 0)
{
struct rt_serial_rx_dma* rx_dma;
rx_dma = (struct rt_serial_rx_dma*) serial->serial_rx;
RT_ASSERT(rx_dma != RT_NULL);
RT_ASSERT(serial->parent.rx_indicate != RT_NULL);
serial->parent.rx_indicate(&(serial->parent), length);
rx_dma->activated = RT_FALSE;
}
else
{
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* update fifo put index */
rt_dma_recv_update_put_index(serial, length);
/* calculate received total length */
length = rt_dma_calc_recved_len(serial);
/* enable interrupt */
rt_hw_interrupt_enable(level);
/* invoke callback */
if (serial->parent.rx_indicate != RT_NULL)
{
serial->parent.rx_indicate(&(serial->parent), length);
}
}
break;
}
#endif /* RT_SERIAL_USING_DMA */
}
}
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