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[BSP] Enhanced stm32f40x serial DMA rx driver reliability.

This commit is contained in:
armink 2017-03-17 13:31:47 +08:00
parent afe3b16106
commit cebbee7908
1 changed files with 38 additions and 18 deletions
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56
bsp/stm32f40x/drivers/usart.c
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@ -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);