isr.c

c51读写SD卡原代码,c51编写,串口接收

#include "common.h"
#include "HAL.H"
#include "HPI.H"
#include "HPI32.H"

extern FLAGS bdata bFlags;
extern unsigned char xdata UARTBUF[];//UARTBUF_LENGTH];
extern Command_Def xdata Command;			
//////////////////////////////////////////
void ISR_COMM(void) interrupt 4
{
	unsigned char *pBuf=(unsigned char *)&Command;  //Low Bit at Head
	unsigned long xdata  timecount;
	unsigned int cnt;
	
	MCU_LED3=0;

	if(RI==0)
		{
		MCU_LED3=1;
		return;
		}

	for(cnt=0;cnt<37;cnt++)
	{
		timecount=0;
		while(!RI&&++timecount<20005);
		if(timecount>20000)	
			{
			Command.CLass=0xff;
			bFlags.bits.bUartInDone=1;
			RI=0;
			MCU_LED3=1;
			return;
			}		
		*(pBuf+cnt)=SBUF;
		RI=0;
	}
	
	/////// data phase /////////////////////
	if(Command.CLass==0x04||Command.CLass==0x05||Command.CLass==0x09) ///GreatFile/GreatDir/WriteFile
		{
		if(Command.len>MAX_WRITE_LENGTH)
		{
		Command.CLass=0xff;
		bFlags.bits.bUartInDone=1;
		MCU_LED3=1;
		return;
		}

		for(cnt=0;cnt<Command.len;cnt++)
			{
			timecount=0;
			while(!RI&&++timecount<20005);
			if(timecount>20000)	
			{
				Command.CLass=0xff;
				bFlags.bits.bUartInDone=1;
				RI=0;
				MCU_LED3=1;
				return;
			}
			UARTBUF[cnt]=SBUF;
			RI=0;
			}
		}	
	//////////////////////////
	bFlags.bits.bUartInDone=1;
	RI=0;	
	MCU_LED3=1;
}