关于stm32 串口接收数据丢失的问题

周兵 · 发表于 2018-9-29 16:48:52

本帖最后由周兵于 2018-9-29 16:50 编辑

本人最近在做iap相关的升级时遇到串口无法正常接收数据的问题我的想法是通过上位机将数据打包为1k数据在加上帧头帧尾

帧头总包    包号    数据       帧尾    数据长度高八位数据长度第八位
A0    25       00       ....       0A       94                      0C

现在遇到的问题是我通过串口助手可以很清楚的知道我上位机的  数据正确那么我通过stm32中断的接收返回  发现数据异常
[mw_shl_code=applescript,true]void uart_init(u32 bound){
  //GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //ê1ÄüUSART1￡¬GPIOAê±Öó

//USART1_TX GPIOA.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸′óÃíÆíìêä3ö
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9

  //USART1_RX    GPIOA.103õê¼»ˉ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë
  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10

  //Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×óóÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷

//USART 3õê¼»ˉéèÖÃ

USART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂê
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8Î»êy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæÅ¼D￡ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·￠Ä￡ê½

  USART_Init(USART1, &USART_InitStructure); //3õê¼»ˉ′®¿ú1
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï
  USART_Cmd(USART1, ENABLE);                   //ê1Äü′®¿ú1

}

#if EN_USART1_RX //èç1ûê1ÄüáË½óêÕ
void USART1_IRQHandler(void)             //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Res;
unsigned int hbit,lbit;
// hbit = (a)&0xf0>>4;
// lbit = (a)&0x0f;

#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{

// Res =USART_ReceiveData(USART1);//(USART1->DR); //¶áè¡½óêÕμ½μÄêy¾Y
Res =USART1->DR;

//
// if(USART_RX_CNT<USART_REC_LEN)
// {
// printf("%X",Res);
// USART_RX_BUF[USART_RX_CNT]=Res;
// USART_RX_CNT++;
// }

//hbit = ((Res)&0xf0)>>4;
// lbit = (Res)&0x0f;
// printf("%X__%d__%d__\r\n",Res,hbit,lbit);




if(Res!=0x0A&&state==6)
{
hbit = ((Res)&0xf0)>>4;
   lbit = (Res)&0x0f;
printf("6.");
printf("%X\r\n",Res);
state_head[state-1]=hbit*16+lbit;
USART_RX_CNT_L=hbit*16+lbit;
USART_RX_CNT_Z= USART_RX_CNT_L +USART_RX_CNT_H;

state=0;
}

if(Res!=0x0A&&state==5)
{
   hbit = ((Res)&0xf0)>>4;
   lbit = (Res)&0x0f;
printf("5.");
//printf("%X\r\n",Res);
state_head[state-1]=hbit*16*16*16+lbit*16*16;
USART_RX_CNT_H=hbit*16*16*16+lbit*16*16;
state=6;
}

if(Res==0x0A&&state==4)
{
printf("4.");
// printf("%X\r\n",Res);
state_head[state-1]=Res;
state=5;
}

if((MAGE_BAOLEN==MAGE_BAOLEN_Z)&&state==3)
{

// printf("%X F\r\n",Res);
USART_RX_BUF[USART_RX_CNT]=Res;
USART_RX_CNT++;
printf("%d.\r\n",USART_RX_CNT);
if(USART_RX_CNT==USART_RX_CNT_Z)
         state=4;
}

if((MAGE_BAOLEN<MAGE_BAOLEN_Z)&& (state==3))
{

// printf("%X f\r\n",Res);
USART_RX_BUF[USART_RX_CNT]=Res;
USART_RX_CNT++;
printf("%d.\r\n",USART_RX_CNT);
if(USART_RX_CNT==1024*(MAGE_BAOLEN+1))
         state=4;
}

if(state==2&&Res<=MAGE_BAOLEN_Z)
{
hbit = ((Res)&0xf0)>>4;
      lbit = (Res)&0x0f;
state_head[state]=hbit*10+lbit;
MAGE_BAOLEN=hbit*10+lbit;
state=3;
// printf("3.");
// printf("%X\r\n",Res);
//printf("%d \r\n",MAGE_BAOLEN);
}

if(state==1)
{
hbit = ((Res)&0xf0)>>4;
   lbit = (Res)&0x0f;
state_head[state]=hbit*10+lbit;
MAGE_BAOLEN_Z=hbit*10+lbit;
state=2;
printf("2.");
// printf("%X\r\n",Res);
//printf("%d\r\n",MAGE_BAOLEN_Z);
}

if(Res==0xA0&&state==0)
{
printf("1.");
// printf("%X\r\n",Res);
state_head[state]=Res;
state=1;
}

if((USART_RX_CNT==USART_RX_CNT_Z)&&(USART_RX_CNT==MAGE_BAOLEN_Z)&&(USART_RX_CNT!=0))
{

USART_RX_END=1;
}else
{

USART_RX_END=0;
}


   USART_ClearITPendingBit(USART1,USART_IT_RXNE);
}



#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();
#endif
}
#endif
[/mw_shl_code]