STM32F215 串口问题

只看该作者 · 2014-7-22 11:47

最近在用STM32F215做一个厂测工具，把四路串口的数据，通过usb hid协议传到pc端，数据量非常大，每秒大约有8k的log, 我必须把log记录下来。方案如下。
1. 我使用了USART1, USART2 UART5 USART6。
2. 在USART中开启RXNE中断，当收到RXNE中断，启动DMA接收数据, 关闭RXNE中断，打开IDEL中断
3. 当收到dam中断时，重新开启DMA接收
4. 当收到IDEL中断，关闭DMA接收，启动RXNE中断

现碰到问题如下，usart1 usart2 usart6都是可以正常工作的，uart5出现以下问题
使用串口工具，发送1个字符，可以先进入RXNE中断，然后在进入IDEL中断
在次使用串口发送1个字符，先进入RXNE中断，然后进去DMA中断。其它的串口都不会。

想问一下香主，进入IDEL中断的要求是什么，ＴＸ，ＲＸ需要什么电平状态，整个过程，没有使用TX发送一个字节，所以不会是TX引起不能进入idel模式

只看该作者 · 2014-7-22 11:51

我在DMA控制器中，开始了传输完成中断，现论上，没有传输完NDTR设定的字节数，不应该产生中断呀！但是为什么第二次会产生DMA中呢

只看该作者 · 2014-7-22 11:51

static void UART_DMA_Interrupt( void *Param )
{
OS_ERR err;
unsigned int cr;
struct UART_DEVICE *uart = (struct UART_DEVICE *)Param;
unsigned int sr = uart->uart->SR;
uart->uart->SR = 0;
cr = uart->uart->CR1;
if ( (cr & 0x10) && (sr & 0x10) ){
//IDEL ¼à²âµ½×ÜÏß¿ÕÏÐ
uart->RecvDMA.DMA->CR = 0;
uart->current_buffer->Recv_Size = sizeof(uart->current_buffer->buffer) - uart->RecvDMA.DMA->NDTR;
uart->RecvDMA.DMA->NDTR = 0;
OSQPost( &uart->Recv_Queue, (void *)uart->current_buffer, 1,OS_OPT_POST_NO_SCHED | OS_OPT_POST_ALL | OS_OPT_POST_FIFO, &err );
uart->uart->CR1 |= (0x20);
uart->uart->CR1 &= (~0x10);
}
if ( (cr & 0x20) && (sr & 0x20) ){
//RXNE ¶ÁÊý¾Ý¼Ä´æÆ÷·Ç¿Õ
uart->uart->CR1 |= (0x10);
if ( uart->current_buffer == NULL ){
uart->current_buffer = &uart->Recv[0];
}else if ( uart->current_buffer == &uart->Recv[0] ){
uart->current_buffer = &uart->Recv[1];
}else if ( uart->current_buffer == &uart->Recv[1] ){
uart->current_buffer = &uart->Recv[2];
}else if ( uart->current_buffer == &uart->Recv[2] ){
uart->current_buffer = &uart->Recv[3];
}else{
uart->current_buffer = &uart->Recv[0];
}
USART_DMA_Recv( uart->RecvDMA.DMA, (void *)&uart->uart->DR, uart->current_buffer, sizeof(uart->current_buffer->buffer) );
uart->uart->CR1 &= (~0x20);
}
cr = uart->uart->CR1;
}

只看该作者 · 2014-7-22 11:52

static void UART_Recv_DMA_Interrupt( void *Param )
{
OS_ERR err;
struct UART_DMA *Channel = (struct UART_DMA *)Param;
DMA_TypeDef *DMA = get_dma( Channel->DMA );
int flag = get_dma_stream( Channel->DMA );
unsigned int isr = (0 == flag ? DMA->LISR : DMA->HISR);
unsigned int ccr = Channel->DMA->CR;
register struct UART_RECV *pbuf = NULL;
register struct UART_RECV *current = Channel->device->current_buffer;
isr &= get_dma_mask( Channel->DMA );
if ( 0 == flag ){
DMA->LIFCR |= isr;
}else{
DMA->HIFCR |= isr;
}
current->Recv_Size = sizeof(current->buffer);
if ( current == NULL ){
pbuf = &Channel->device->Recv[0];
}else if ( current == &Channel->device->Recv[0] ){
pbuf = &Channel->device->Recv[1];
}else if ( current == &Channel->device->Recv[1] ){
pbuf = &Channel->device->Recv[2];
}else if ( current == &Channel->device->Recv[2] ){
pbuf = &Channel->device->Recv[3];
}else{
pbuf = &Channel->device->Recv[0];
}
Channel->device->current_buffer = pbuf;
USART_DMA_Recv( Channel->device->RecvDMA.DMA, (void *)&Channel->device->uart->DR, pbuf, sizeof(pbuf->buffer) );
OSQPost( &Channel->device->Recv_Queue, (void *)current, 1, OS_OPT_POST_NO_SCHED | OS_OPT_POST_ALL | OS_OPT_POST_FIFO, &err );
}