Sd卡是否忙的判断:

1.      Is there a command currently in progress?   SDICmdSta[8]

2.      Is there a transfer in progress?             SDIDatSta[1:2]

3.      Is there a READ-WAIT request in progress?  SDIDatSta[10]

 

Sd卡是否插入是通过可配置的GPIO口引脚的电平去判断(GPXDAT