STM32F030串口通信问题快把我逼疯了，忘大神赐教

C919WAY · 发表于 2019-5-7 17:27:05

主程序
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#include "stm32f0xx.h"
#include  "led.h"
#include  "exit.h"
#include  "uart.h"
unsigned int keyflag=0;
unsigned int downswitchflag=0;
unsigned int upwaterflag=0;
unsigned int RXD_OK_flag=0;
unsigned int AnswerData[7];
int main(void)
{
SystemInit();
LED_Init();
  LED_Init1();
USART_Configuration();
AnswerData[1]=0XED;                      //**μ±Ç°½úμãoÅ****//
  AnswerData[2]=0X27;          //**éè¶¨½Ç¶èÖμ****//
  AnswerData[3]=0X10;          //**éè¶¨½Ç¶èÖμ****//
AnswerData[4]=0XEA;          //**éè¶¨½Ç¶èÖμ****//
//EXIT_KEY_Init();

while(1)
{
if(RXD_OK_flag==1)
{
   USART_SendData(USART1,AnswerData[1]);
   USART_SendData(USART1,AnswerData[2]);
   USART_SendData(USART1,AnswerData[3]);
   USART_SendData(USART1,AnswerData[4]);
   RXD_OK_flag=0;
   GPIO_ResetBits(GPIOA, GPIO_Pin_3);
   GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
}
}
串口配置程序
#include "uart.h"
#include <stdio.h>
//½óêÕ×′ì¬
//bit15￡¬ ½óêÕíê3é±êÖ¾
//bit14￡¬ ½óêÕμ½0x0d
//bit13~0￡¬ ½óêÕμ½μÄóDD§×Ö½úêyÄ¿

unsigned int i0=1;
unsigned int tmp;
unsigned int CommandFromPc[7];
unsigned int ADD;
extern unsigned int RXD_OK_flag;
extern unsigned int AnswerData[7];
void USART_Configuration(void)//′®¿ú3õê¼»ˉoˉêy
{

      GPIO_InitTypeDef  GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );

      GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_1);
      GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_1);
      /*
      *  USART1_TX -> PA9 , USART1_RX ->       PA10
      */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = 9600;//éèÖÃ′®¿ú2¨ìØÂê
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;//éèÖÃêy¾YÎ»
      USART_InitStructure.USART_StopBits = USART_StopBits_1;//éèÖÃí￡Ö1Î»
      USART_InitStructure.USART_Parity = USART_Parity_No;//éèÖÃD§ÑéÎ»
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//éèÖÃá÷¿ØÖÆ
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//éèÖÃ1¤×÷Ä￡ê½
      USART_Init(USART1, &USART_InitStructure); //ÅäÖÃèë½á11ìå

USART_ClearFlag(USART1,USART_FLAG_TC);
      USART_ITConfig(USART1,USART_IT_TC,ENABLE);
      USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
      USART_Cmd(USART1,ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPriority = 1;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);
}
void USART1_IRQHandler(void)
{

  //unsigned int m;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
tmp=USART_ReceiveData(USART1);
//USART_SendData(USART1,tmp);
if(tmp==0xED)
{
      RXD_OK_flag=1;
   }
   }

}

原代码在附件中，目前的现象是如果在接收中断里做应答，自发自收，用串口调试器是可以实现的；但是像现在这样，在串口接收中断里做一个标志位，将标志位传递给主函数，主函数查询到标志位再应答就是不行。我也不知道为什么？好奇怪，请高手能不能帮忙看看，代码不长，就十几行，死活找不到原因，初步分析是接收中断的参数变化没有传递到主函数去。

www88988 · 发表于 2019-5-7 17:27:06

在串口配置函数中把 USART_ITConfig(USART1,USART_IT_TC,ENABLE); 这句去了，不开发送中断。主函数中在每个发送 USART_SendData函数后加条 while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);就OK了，发送函数没必要开中断的。