STM32F103ZET6的USART2的问题

只看该作者 · 2018-6-30 19:22

求大神赐教，为什么我用USART2的DMA方式接收不到外部一模块发送来的数据，USART2应该怎样与外部模块的串口线相连啊。
下面是我对USART2的配置，求大神指点哪里出错了，还是我的硬件连接错了：

void USART2_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);

      /* config USART2 clock */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

      /* USART2 GPIO config */
/* Configure USART2 Tx (PA.02) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2 Rx (PA.03) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

      /* USART2 mode config */
      USART_InitStructure.USART_BaudRate = 9600;
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      USART_InitStructure.USART_Parity = USART_Parity_No ;
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

      USART_Init(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
}

/**
  * @brief  USART2 TX DMA 配置
  * @param  无
  * @retval 无
  */
void USART2_DMA_Config(void)
{
            DMA_InitTypeDef DMA_InitStructure;

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

            //NVIC_Config();

            /*设置DMA源：串口数据寄存器地址*/
            DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_Base;

            /*内存地址(要传输的变量的指针)*/
            DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff;
            //DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC;

            /*方向：从外设到内存*/
            DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

            /*传输大小DMA_BufferSize=SENDBUFF_SIZE*/
            DMA_InitStructure.DMA_BufferSize = SENDBUFF_SIZE;
            //DMA_InitStructure.DMA_BufferSize = 1;

            /*外设地址不增*/
            DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

            /*内存地址不变*/
            DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

            /*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_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;       //半字

   // DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

            /*DMA模式：不断循环*/
      //       DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
            DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

            /*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6通道*/
            DMA_Init(DMA1_Channel6, &DMA_InitStructure);

            /*使能DMA*/
            DMA_Cmd (DMA1_Channel6,ENABLE);
      //       DMA_ITConfig(DMA1_Channel6,DMA_IT_TC,ENABLE);  //配置DMA发送完成后产生中断
}

STM32F103ZET6的USART2的问题

相关下载

相关帖子