外部中断我接收数据一次可以一次不行，我中断优先级设置最高了，是还有中断干扰吗？

发布于 2021-04-20 17:09:38 浏览：1264 订阅该版

中断函数
```c
void EXTI6_IRQHandler(void)
{
   rt_interrupt_enter(); 
   GPIO_EXTI_IRQHandler(EXTI_Line6,GPIOG);
   EXTI_ClearITPendingBit(EXTI_Line6);
   NVIC_ClearPendingIRQ(EXTI6_IRQn);
   rt_interrupt_leave();
}
```
回调执行函数
```c
uint16_t IDBox_ReceiveData(uint8_t * buffer, uint16_t buflen)
{
	uint8_t temp = 0;
	uint16_t len = 0;
    uint8_t *data = buffer;
    uint8_t i = 0;
   
    if(IDBox_CheckSendDataLock())
    {
        return 0;
    }

IDBOX_S_SDATA_Q_CFG_INPUT();
	IDBOX_S_SCLK_Q_CFG_INPUT();
	
	while (IDBOX_S_SCLK_GET_STATUS() != 0)
    {
        if (IDBOX_S_TX_FRAME_GET_STATUS() == 0) goto retn;
    }

while (IDBOX_S_TX_FRAME_GET_STATUS() != 0)
    {
	   	temp =0x80;	
        *data = 0x00;
       
		for (i=0;i<8;i++)
		{    			
			while(IDBOX_S_SCLK_GET_STATUS() == 0);		
            
			if ( IDBOX_S_SDATA_GET_STATUS() != 0)
				(*data)|= temp;
	
  			temp >>= 1;
			
			while(IDBOX_S_SCLK_GET_STATUS() != 0)
			{
				if (IDBOX_S_TX_FRAME_GET_STATUS() == 0) goto retn;
			}			
		}

IDBOX_S_SDATA_Q_CFG_OUTPUT();
        IDBOX_S_SDATA_SET_LOW();

while(IDBOX_S_SCLK_GET_STATUS() == 0);         
        while(IDBOX_S_SCLK_GET_STATUS() != 0)
        {
            if (IDBOX_S_TX_FRAME_GET_STATUS() == 0) goto retn;
        }
        
        IDBOX_S_SDATA_Q_CFG_INPUT();
        
		if(len >= buflen)
		{
			goto retn;
		}
		data++;
		len++;
    }
   
retn:

IDBOX_S_SDATA_Q_CFG_OUTPUT();
    IDBOX_S_SDATA_SET_HIGH();
    IDBOX_S_SCLK_Q_CFG_OUTPUT();
    IDBOX_S_SCLK_SET_HIGH();
	
	rt_sem_release(&idcard_lock);

return len;
}
```