用USART3时收不到数据？？？

rXQiang · 发表于 2019-5-1 10:43:21

本帖最后由 rXQiang 于 2019-5-1 10:44 编辑

我用USART3 时，串口调试助手收不到数据。但用例程的USART1 却可以，不知道哪里出了问题。

板子是 STM32F103 战舰V3
求大佬帮忙解答~~
多谢

源代码：
#include "stm32f10x.h"
void myUart3_Init(u32 pBound)
{
      GPIO_InitTypeDef GPIO_InitStrue;
      USART_InitTypeDef USART_InitStrue;
      NVIC_InitTypeDef NVIC_InitStrue;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

      GPIO_InitStrue.GPIO_Mode = GPIO_Mode_AF_PP;       //初始化PB.10（USART3.Tx）
      GPIO_InitStrue.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStrue.GPIO_Speed = GPIO_Speed_10MHz;
      GPIO_Init(GPIOB,&GPIO_InitStrue);

      GPIO_InitStrue.GPIO_Mode = GPIO_Mode_IN_FLOATING;//初始化PB.11(USART3.Rx)
      GPIO_InitStrue.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStrue.GPIO_Speed = GPIO_Speed_10MHz;
      GPIO_Init(GPIOB,&GPIO_InitStrue);

      USART_InitStrue.USART_BaudRate = pBound;//初始化USART3
      USART_InitStrue.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
      USART_InitStrue.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
      USART_InitStrue.USART_Parity = USART_Parity_No;
      USART_InitStrue.USART_StopBits = USART_StopBits_1;
      USART_InitStrue.USART_WordLength = USART_WordLength_8b;

      USART_Init(USART3,&USART_InitStrue);
      USART_Cmd(USART3,ENABLE);//USART3 使能
      USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);

      NVIC_InitStrue.NVIC_IRQChannel = USART3_IRQn;
      NVIC_InitStrue.NVIC_IRQChannelCmd = ENABLE;
      NVIC_InitStrue.NVIC_IRQChannelPreemptionPriority = 1;
      NVIC_InitStrue.NVIC_IRQChannelSubPriority = 1;
      NVIC_Init(&NVIC_InitStrue);
}
void USART3_IRQHandler(void)//USART3 中断函数
{
      u8 res;
      if(USART_GetITStatus(USART3,USART_IT_RXNE))
      {
   res= USART_ReceiveData(USART3);
   USART_SendData(USART3,res);
  }
}
int main(void)
{
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      myUart3_Init(115200);
      while(1);
}