INT32S uartgetc(UART_HANDLER port)
{
INT32S st;
if(port->recnull)
{
st=-1;
}
else
{
st=port->recfifo[port->rechead];
port->rechead++;
port->rechead%=UART_FIFO_SIZE;
port->recfull=0;
if(port->rechead==port->recend)
{
port->recnull=1;
}
}
return st;
}
-1也就是0xff，如果接收到0xff是不是就会出错？！ |
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