stm32串口实验可发送数据但是无法显示回传数据为什么？

hcjjs · 发表于 2019-9-10 17:27:17

代码如下：
#include "stm32f10x.h"

void My_USART1_Init()
{
   GPIO_InitTypeDef GPIO_InitStrue;
   USART_InitTypeDef USART_InitStrue;
   NVIC_InitTypeDef NVIC_Initstrue;
   RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA,ENABLE);
   RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1,ENABLE);

   GPIO_InitStrue.GPIO_Mode=GPIO_Mode_AF_PP;
   GPIO_InitStrue.GPIO_Pin=GPIO_Pin_9;
   GPIO_InitStrue.GPIO_Speed=GPIO_Speed_10MHz;
   GPIO_Init(GPIOA,&GPIO_InitStrue);

   GPIO_InitStrue.GPIO_Mode=GPIO_Mode_IN_FLOATING;
   GPIO_InitStrue.GPIO_Pin=GPIO_Pin_10;
   GPIO_InitStrue.GPIO_Speed=GPIO_Speed_10MHz;
   GPIO_Init(GPIOA,&GPIO_InitStrue);

   USART_InitStrue.USART_BaudRate=115200;
   USART_InitStrue.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
   USART_InitStrue.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;
   USART_InitStrue.USART_Parity=USART_Parity_No;
   USART_InitStrue.USART_StopBits=USART_StopBits_1;
   USART_InitStrue.USART_WordLength=USART_WordLength_8b;
   USART_Init(USART1,&USART_InitStrue);
   USART_Cmd(USART1,ENABLE);
   USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

   NVIC_Initstrue.NVIC_IRQChannel=USART1_IRQn;
   NVIC_Initstrue.NVIC_IRQChannelCmd=ENABLE;
   NVIC_Initstrue.NVIC_IRQChannelPreemptionPriority=1;
   NVIC_Initstrue.NVIC_IRQChannelSubPriority=1;

   NVIC_Init(&NVIC_Initstrue);
}
void  USART1_IRQHandler(void)
{
u8 res;
if(USART_GetITStatus(USART1,USART_IT_RXNE))
{
      res=USART_ReceiveData(USART1);
      USART_SendData(USART1,res);
}

}
int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
   My_USART1_Init();
   while(1);
}