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Merge pull request #706 from armink/serial_rx_dma 

[DeviceDrivers] 增强串口 DMA 接收驱动的可靠性
This commit is contained in:
Bernard Xiong 2017-03-18 11:44:53 +08:00 committed by GitHub
parent 282c2f22f2 82930906a2
commit 08f861f899
3 changed files with 138 additions and 83 deletions
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75
bsp/stm32f10x/drivers/usart.c
View File

@ -48,15 +48,18 @@ struct stm32_uart
{
USART_TypeDef *uart_device;
IRQn_Type irq;
struct stm32_uart_dma {
struct stm32_uart_dma
{
/* dma channel */
DMA_Channel_TypeDef *rx_ch;
/* dma global flag */
uint32_t rx_gl_flag;
/* dma irq channel */
uint8_t rx_irq_ch;
/* setting receive len */
rt_size_t setting_recv_len;
/* last receive index */
rt_size_t last_recv_len;
rt_size_t last_recv_index;
} dma;
};
@ -145,9 +148,9 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
if(serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX)
if (serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX)
{
if(!(uart->uart_device->SR & USART_FLAG_TXE))
if (!(uart->uart_device->SR & USART_FLAG_TXE))
{
USART_ITConfig(uart->uart_device, USART_IT_TC, ENABLE);
return -1;
@ -188,24 +191,31 @@ static int stm32_getc(struct rt_serial_device *serial)
*/
static void dma_uart_rx_idle_isr(struct rt_serial_device *serial) {
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
rt_size_t recv_total_len, recv_len;
/* disable dma, stop receive data */
DMA_Cmd(uart->dma.rx_ch, DISABLE);
rt_size_t recv_total_index, recv_len;
rt_base_t level;
recv_total_len = serial->config.bufsz - DMA_GetCurrDataCounter(uart->dma.rx_ch);
if (recv_total_len > uart->dma.last_recv_len) {
recv_len = recv_total_len - uart->dma.last_recv_len;
} else {
recv_len = recv_total_len;
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_total_index = uart->dma.setting_recv_len - DMA_GetCurrDataCounter(uart->dma.rx_ch);
if (recv_total_index >= uart->dma.last_recv_index)
{
recv_len = recv_total_index - uart->dma.last_recv_index;
}
else
{
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index + recv_total_index;
}
uart->dma.last_recv_len = recv_total_len;
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
uart->dma.last_recv_index = recv_total_index;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len) rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
/* read a data for clear receive idle interrupt flag */
USART_ReceiveData(uart->uart_device);
DMA_ClearFlag(uart->dma.rx_gl_flag);
DMA_Cmd(uart->dma.rx_ch, ENABLE);
}
/**
@ -215,24 +225,29 @@ static void dma_uart_rx_idle_isr(struct rt_serial_device *serial) {
*/
static void dma_rx_done_isr(struct rt_serial_device *serial) {
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
rt_size_t recv_total_len, recv_len;
/* disable dma, stop receive data */
DMA_Cmd(uart->dma.rx_ch, DISABLE);
rt_size_t recv_total_index, recv_len;
rt_base_t level;
recv_total_len = serial->config.bufsz - DMA_GetCurrDataCounter(uart->dma.rx_ch);
if (recv_total_len > uart->dma.last_recv_len) {
recv_len = recv_total_len - uart->dma.last_recv_len;
} else {
recv_len = recv_total_len;
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_total_index = uart->dma.setting_recv_len - DMA_GetCurrDataCounter(uart->dma.rx_ch);
if (recv_total_index >= uart->dma.last_recv_index)
{
recv_len = recv_total_index - uart->dma.last_recv_index;
}
else
{
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index + recv_total_index;
}
uart->dma.last_recv_len = recv_total_len;
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
uart->dma.last_recv_index = recv_total_index;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len) rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
DMA_ClearFlag(uart->dma.rx_gl_flag);
/* reload */
DMA_SetCurrDataCounter(uart->dma.rx_ch, serial->config.bufsz);
DMA_Cmd(uart->dma.rx_ch, ENABLE);
}
/**
@ -527,6 +542,8 @@ static void DMA_Configuration(struct rt_serial_device *serial) {
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
uart->dma.setting_recv_len = serial->config.bufsz;
/* enable transmit idle interrupt */
USART_ITConfig(uart->uart_device, USART_IT_IDLE , ENABLE);
@ -544,7 +561,7 @@ static void DMA_Configuration(struct rt_serial_device *serial) {
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(uart->dma.rx_ch, &DMA_InitStructure);

56
bsp/stm32f40x/drivers/usart.c
View File

@ -70,7 +70,8 @@ struct stm32_uart
{
USART_TypeDef *uart_device;
IRQn_Type irq;
struct stm32_uart_dma {
struct stm32_uart_dma
{
/* dma stream */
DMA_Stream_TypeDef *rx_stream;
/* dma channel */
@ -200,7 +201,8 @@ static int stm32_getc(struct rt_serial_device *serial)
* @param mem_base_addr memory 0 base address for DMA stream
*/
static void dma_uart_config(struct rt_serial_device *serial, uint32_t setting_recv_len,
void *mem_base_addr) {
void *mem_base_addr)
{
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
DMA_InitTypeDef DMA_InitStructure;
@ -234,16 +236,26 @@ static void dma_uart_config(struct rt_serial_device *serial, uint32_t setting_re
static void dma_uart_rx_idle_isr(struct rt_serial_device *serial) {
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
rt_size_t recv_total_index, recv_len;
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_total_index = uart->dma.setting_recv_len - DMA_GetCurrDataCounter(uart->dma.rx_stream);
if (recv_total_index >= uart->dma.last_recv_index) {
if (recv_total_index >= uart->dma.last_recv_index)
{
recv_len = recv_total_index - uart->dma.last_recv_index;
} else {
}
else
{
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index + recv_total_index;
}
uart->dma.last_recv_index = recv_total_index;
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
uart->dma.last_recv_index = recv_total_index;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len) rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
/* read a data for clear receive idle interrupt flag */
USART_ReceiveData(uart->uart_device);
@ -254,28 +266,35 @@ static void dma_uart_rx_idle_isr(struct rt_serial_device *serial) {
*
* @param serial serial device
*/
static void dma_rx_done_isr(struct rt_serial_device *serial) {
static void dma_rx_done_isr(struct rt_serial_device *serial)
{
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
rt_size_t recv_total_index, recv_len;
rt_base_t level;
if (DMA_GetFlagStatus(uart->dma.rx_stream, uart->dma.rx_flag) != RESET) {
/* disable dma, stop receive data */
DMA_Cmd(uart->dma.rx_stream, DISABLE);
if (DMA_GetFlagStatus(uart->dma.rx_stream, uart->dma.rx_flag) != RESET)
{
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_total_index = uart->dma.setting_recv_len - DMA_GetCurrDataCounter(uart->dma.rx_stream);
if (recv_total_index >= uart->dma.last_recv_index) {
if (recv_total_index >= uart->dma.last_recv_index)
{
recv_len = recv_total_index - uart->dma.last_recv_index;
} else {
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index + recv_total_index;
uart->dma.last_recv_index = recv_total_index;
}
uart->dma.last_recv_index = recv_total_index;
else
{
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index + recv_total_index;
}
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
uart->dma.last_recv_index = recv_total_index;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len) rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
/* start receive data */
DMA_ClearFlag(uart->dma.rx_stream, uart->dma.rx_flag);
DMA_Cmd(uart->dma.rx_stream, ENABLE);
}
}
@ -284,7 +303,8 @@ static void dma_rx_done_isr(struct rt_serial_device *serial) {
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial) {
static void uart_isr(struct rt_serial_device *serial)
{
struct stm32_uart *uart = (struct stm32_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);

78
components/drivers/serial/serial.c
View File

@ -166,13 +166,14 @@ rt_inline int _serial_int_tx(struct rt_serial_device *serial, const rt_uint8_t *
*
* @return length
*/
static rt_size_t rt_dma_calc_recved_len(struct rt_serial_device *serial) {
static rt_size_t rx_length;
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
static rt_size_t rt_dma_calc_recved_len(struct rt_serial_device *serial)
{
rt_size_t rx_length;
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
rx_length = (rx_fifo->put_index >= rx_fifo->get_index)? (rx_fifo->put_index - rx_fifo->get_index):
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));
return rx_length;
}
@ -183,14 +184,16 @@ static rt_size_t rt_dma_calc_recved_len(struct rt_serial_device *serial) {
* @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;
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));
rx_fifo->get_index += len;
if (rx_fifo->get_index > serial->config.bufsz ) {
if (rx_fifo->get_index > serial->config.bufsz)
{
rx_fifo->get_index -= serial->config.bufsz;
}
}
@ -201,37 +204,41 @@ static void rt_dma_recv_update_get_index(struct rt_serial_device *serial, rt_siz
* @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) {
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_size_t i;
RT_ASSERT(rx_fifo != RT_NULL);
if (rx_fifo->get_index <= rx_fifo->put_index) {
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) {
for (i = 0; i <= len / serial->config.bufsz; i++) {
rx_fifo->put_index -= serial->config.bufsz;
}
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) {
if (rx_fifo->put_index >= rx_fifo->get_index)
{
rx_fifo->get_index = rx_fifo->put_index + 1;
}
}
} 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) {
for (i = 0; i <= len / serial->config.bufsz; i++) {
rx_fifo->put_index -= serial->config.bufsz;
}
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->get_index = rx_fifo->put_index + 1;
}
}
if (rx_fifo->get_index >= serial->config.bufsz) rx_fifo->get_index = 0;
}
/*
@ -607,17 +614,17 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
if (args)
{
struct serial_configure *pconfig = (struct serial_configure *) args;
if(pconfig->bufsz != serial->config.bufsz && serial->parent.ref_count)
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)
if (serial->parent.ref_count)
{
/* serial device has been opened, to configure it */
serial->ops->configure(serial, (struct serial_configure *)args);
serial->ops->configure(serial, (struct serial_configure *) args);
}
}
@ -754,25 +761,36 @@ void rt_hw_serial_isr(struct rt_serial_device *serial, int event)
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) {
if (serial->config.bufsz == 0)
{
struct rt_serial_rx_dma* rx_dma;
rx_dma = (struct rt_serial_rx_dma*)serial->serial_rx;
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 {
}
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), rt_dma_calc_recved_len(serial));
if (serial->parent.rx_indicate != RT_NULL)
{
serial->parent.rx_indicate(&(serial->parent), length);
}
}
break;