UCOSII 串口中断丢字节

losin · 发表于 2018-1-26 10:34:58

本帖最后由 losin 于 2018-1-27 14:11 编辑

/*****************中断服务函数***************************/

vu16 USART3_RX_STA=0;
vu16 USART3_TX_STA=0;
void USART3_IRQHandler(void)
{
u8 res;
OSIntEnter();
if(USART_GetFlagStatus(USART3, USART_FLAG_RXNE) != RESET)//接收到数据
{
      res=USART_ReceiveData(USART3);
      if((USART3_RX_STA&(1<<15))==0)//接收完的一批数据,还没有被处理,则不再接收其他数据
      {
         if(USART3_RX_STA<USART3_MAX_RECV_LEN) //还可以接收数据
         {
            TIM_SetCounter(TIM7,0);                      //计数器清空
            if(USART3_RX_STA==0)                //使能定时器7的中断
            {
                  TIM_Cmd(TIM7, ENABLE);                   //使能定时器7
            }
            USART3_RX_BUF[USART3_RX_STA++]=res; //记录接收到的值
         }else
         {
            USART3_RX_STA|=1<<15;             //强制标记接收完成
         }
      }
}
OSIntExit();
}
//中断优先级已经设置最高
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;//抢占优先级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;       //子优先级0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;          //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

//串口3 跟sim900 通信时出现接收丢字节现象本该是 +CMGR: "REC UNREAD","+8613560491039","@ZF","13/05/01,16:06:53+32"
ALIENTEK ATK-SIM900A Module 实际是 +CMR: "REC UEAD","+8613560491039","@ZF","13/05/01,16:06:53+32"
ALIENTEK ATK-SIM900A Module ，少几个字节数据


}