STM32 串口ＤＭＡ问题

只看该作者 · 2013-12-25 17:17

大家好：
我用STM32将串口通讯放在ＤＭＡ上发送数数据没什么问题，接收数据那：
　　 if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)
{

LEDB(ON);
DMA_Cmd(DMA1_Channel5, DISABLE); //关闭DMA,防止处理其间有数据

DMA1_Channel5->CMAR    = (uint32_t)USARTx1.Rece_Buffer;
DMA1_Channel5->CNDTR = 64; //重装填
DMA_Cmd(DMA1_Channel5, ENABLE);
if(USART_GetITStatus(USART1, USART_IT_PE | USART_IT_FE | USART_IT_NE) != RESET)//出错
      {
         USART_ClearITPendingBit(USART1, USART_IT_PE | USART_IT_FE | USART_IT_NE);
      }
else{}
      //USART_ClearITPendingBit(USART1, USART_IT_RXNE);
      USART_ClearITPendingBit(USART1, USART_IT_IDLE);
//DMA_ClearITPendingBit(DMA1_IT_TC5); //清除传输完毕中断
//DMA_ClearITPendingBit(DMA1_IT_TE5);
}
else{}
　　　程序初始化完毕之后，发送一直没问题，但是我从上位机发一帧数据下去之后，整个程序仿佛死了一样有做watchdog，望各位大侠指点迷津！

只看该作者 · 2013-12-25 20:23

抽空帮楼主看一看老专家会诊

只看该作者 · 2013-12-25 21:02

顶起来，希望有大虾帮你解决困惑

只看该作者 · 2013-12-26 15:32

void DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //开启DMA时钟

DMA_DeInit(DMA1_Channel4);
/*设置DMA源：内存地址&串口数据寄存器地址*/
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
/*内存地址(要传输的变量的指针)*/
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)USARTx1.Tran_Buffer;
/*方向：从内存到外设*/
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
/*传输大小DMA_BufferSize=SENDBUFF_SIZE*/
DMA_InitStructure.DMA_BufferSize = USART1_BUFF_SIZE;//最大通讯长度
/*外设地址不增*/
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
/*内存地址自增*/
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
/*外设数据单位*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
/*内存数据单位 8bit*/
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
/*DMA模式：一次传输，循环*/
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//DMA_Mode_Normal
/*优先级：中*/
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
/*禁止内存到内存的传输 */
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
/*配置DMA1的4通道*/
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
//DMA_Cmd(DMA1_Channel4,ENABLE); //使能DMA
//intterupt enable
DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
    DMA_ITConfig(DMA1_Channel4, DMA_IT_TE, ENABLE);

USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); //enable Tx data request
    /* Enable USART1 DMA TX request */

DMA_Cmd(DMA1_Channel4,DISABLE);
/*****************************************************************************/
/* DMA1 Channel5 (triggered by USART1 Rx event) Config */
   DMA_DeInit(DMA1_Channel5);
   DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USARTx1.Rece_Buffer;
   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
   DMA_InitStructure.DMA_BufferSize = USART1_BUFF_SIZE;
   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
   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_Circular;
   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
   DMA_Init(DMA1_Channel5, &DMA_InitStructure);

   DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
   DMA_ITConfig(DMA1_Channel5, DMA_IT_TE, ENABLE);

   /* Enable USART1 DMA RX request */
   USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
   DMA_Cmd(DMA1_Channel5, ENABLE);
}

只看该作者 · 2013-12-26 15:34

DMA配置我看大家都是这样写的，在没有接受数据之前！发送一点问题都没有！但是从上位机发了一帧数据之后发送也不能发送了。

STM32 串口ＤＭＡ问题

技术新星奖章