STM32CubeMX环境下利用STM32F103RCT6 单片机的UART5口实现RS232串口通信。_stm32f103rct6 stm32cubemax 485

1. 设置串口和时钟.PC12->UART5_TX;  PD2->UART5_RX.

2 开启中断。

3. 生成progject，在Keil 5中打开，添加相应代码。

第一步：main函数中全局变量：

 
uint8_t aRxBuffer;               //接收中断缓冲
 
uint8_t Uart1_RxBuff[256];          //接收缓冲
 
uint8_t Uart1_Rx_Cnt = 0;           //接收缓冲计数
 
uint8_t   cAlmStr[] = {0xF0,0x00,0x00,0xEE};
 
uint8_t Uart1_TxBuff[256];          //接收缓冲

第二步：开启接收中断

HAL_UART_Receive_IT(&huart5, (uint8_t *)&aRxBuffer, 1);

第三步：While 循环中查询发送：

while(HAL_UART_GetState(&huart5) == HAL_UART_STATE_BUSY_TX);//检测UART发送结束
 
HAL_UART_Transmit(&huart5, (uint8_t *)&cAlmStr, sizeof(cAlmStr),0xFFFF);

第四步：弱函数重写：

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
 
{
 
  UNUSED(huart);
 
  if(huart->Instance==UART5)
 
  {
 
 
 
       if(Uart1_Rx_Cnt >= 255)  //溢出判断
 
       {
 
              Uart1_Rx_Cnt = 0;
 
              memset(Uart1_RxBuff,0x00,sizeof(Uart1_RxBuff));
 
              HAL_UART_Transmit(&huart5, (uint8_t *)&cAlmStr, sizeof(cAlmStr),0xFFFF);
 
       }
 
       else
 
       {
 
              Uart1_RxBuff[Uart1_Rx_Cnt++] = aRxBuffer;   //接收数据转存
 
              if((Uart1_RxBuff[0] == 0xF0)&&(Uart1_RxBuff[Uart1_Rx_Cnt-1] == 0xEE))//判断开始、结束位
 
              {
 
HAL_UART_Transmit(&huart5, (uint8_t *)&Uart1_RxBuff, Uart1_Rx_Cnt,0xFFFF); //将收到的信息发送出去
 
                     Uart1_Rx_Cnt = 0;
 
                     memset(Uart1_RxBuff,0x00,sizeof(Uart1_RxBuff)); //清空数组
 
              }
 
       }
 
       HAL_UART_Receive_IT(&huart5, (uint8_t *)&aRxBuffer, 1);   //再开启接收中断
 
  }
 
}