中断回调函数外部中断

我用外部中断接收数据，接收的时序非常严谨，现在是一次可以一次不行

发布于 2021-04-20 16:38:33 浏览：1393 订阅该版

```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;
}
```