STM32F030每发送两次只接收到一次，请教大神代码哪里有问题？

2019-07-21 01:47发布

经过各位大神的指点，现在STM32F030已经可以收发数据，但是发现一个新问题，每发送两次，只能接收到一次数据，第1，3，5，7。。。。。次可以接收到数据，第2，4，6，8。。。。。。次不能接收到数据，不知道是什么原因，再次请教大神，小弟在此跪谢啦！
代码如下，（附件中随代码）：
主函数：
/******************** (C) COPYRIGHT 2012 Çà·çμç×ó ********************
* ÎÄ¼tÃû  ￡omain
* Ãèêö ￡o
* êμÑéÆ½ì¨￡oÇà·çstm32f051¿a·￠°å
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* ×÷Õß ￡oÇà·ç
* μêÆì ￡oqfv5.taobao.com
**********************************************************************/
#include "stm32f0xx.h"
#include  "led.h"
#include  "exit.h"
#include  "uart.h"
unsigned int i0=1;    //串口文件里的接收递增变量，做成全局变量
unsigned int tmp;    //串口文件里的字节接收变量，做成全局变量
unsigned int CommandFromPc[7];    //串口文件里的接收数组，做成全局变量
unsigned int ADD;    //串口文件里的和校验值，做成全局变量
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)
{
   RXD_OK_flag=0;
   USART_SendData(USART1,AnswerData[1]);
   while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
   USART_SendData(USART1,AnswerData[2]);
   while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
   USART_SendData(USART1,AnswerData[3]);
   while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
   USART_SendData(USART1,AnswerData[4]);
   while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
   GPIO_ResetBits(GPIOA, GPIO_Pin_3);
   GPIO_SetBits(GPIOA, GPIO_Pin_4);
}
}
}

串口文件如下：
#include "uart.h"
#include <stdio.h>

extern unsigned int i0;
extern unsigned int tmp;
extern unsigned int CommandFromPc[7];
extern 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_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)             //??1??????
{

  unsigned int m;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //????(?????????0x0d 0x0a??)
{
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
tmp=USART_ReceiveData(USART1);//(USART1->DR); //????????
switch(i0)
{
      case 0x01 : //???
         if(tmp==0xED)
            {                               //**?????****//
               CommandFromPc[i0]=tmp;       //**????******//
               i0++;
            }
         else
            {  i0=1;  }                      //**??????**//
      break ;
      case 0x02 :
         if(tmp==0x27)
            {                               //**?????****//
               CommandFromPc[i0]=tmp;       //**????******//
               i0++;
            }
         else
            {  i0=1;  }
      break ;

      case 0x03 :
   for(m=1;m<3;m++)
   {  ADD=ADD+CommandFromPc[m]; }
   ADD=ADD&0XFF;
   if(tmp==ADD)
   {                               //**?????****//
   CommandFromPc[i0]=tmp;       //**????******//
   i0++;
   }
   else
   {  i0=1;
      ADD=0;
      }
      break;

      case 0x04 :
   if(tmp==0xEA)
   {
   CommandFromPc[i0]=tmp;             //**??????**//
   RXD_OK_flag=1;                //**??????**//
   i0=1;
   }
      else
      {
         i0=1;
         ADD=0;
      }
      break ;
      default:
      i0=1;
      ADD=0;
   }

   }

}

接收中断的意思是接收到十六进制的0XED 0X27 0X14 0XEA时（其中0X14为0XED+0X27的和校验值），认为正确接收，主函数再做应答

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