serint.c

W78E516B的BOOT程序

/* CONSOLE.C -- serial I/O code                                              */

/*---------------------------------------------------------------------------*/
/* Initialize serial port hardware and variables                             */

#include "serint.h"
#include "reg54.h"
#include "bootloader.h"
#include "stdio.h"

unsigned char nTimeOutCounter = 0;
extern bit nTimeCountFlag;
union add
{
	unsigned int nCounter;		//address is correct?
	struct {unsigned char ah;unsigned char al;}half;
}ADDR;

void SerInitialize() {
 
/*--- set up Timer 1 to produce serial rate                                  */
   TCON &= 0x3F;                     /* clear run & interrupt flags        */
   TMOD &= 0x0F;                     /* flush existing Timer 1 setup       */
   TMOD |= 0x20;                     /* flush existing Timer 1 setup       */

   SCON = 0x50;                     /* flush existing Timer 1 setup       */
   PCON |= 0x80;                    /* set smod = 1;                      */   
   TH1 = TL1 = T1RELOAD & 0x00FF;  /* flush existing Timer 1 setup       */
   TR1 = 1;                        /* start the timer                    */
   ADDR.nCounter = 0;
//   ES  = 1;                        /* enable serial interrupts           */
//   TI  = 1;
}
//默认串口传输速率为9600BPS
/*---------------------------------------------------------------------------*/
/* Serial console interrupt handler                                          */
/* If transmitter output is disabled, we fake trans interrupts until empty   */

void Timer0_Init()
{
   TMOD &= 0xF0;                     /* flush existing Timer 1 setup       */
   TMOD |= 0x01;                     /* set timer0 to 1 mode 16bits timer       */
	nTimeOutCounter = 0;
}


void SerInt() interrupt 4 using 1
{

	if(RI)
	{                     /* receiver interrupt active?    */
		
	    RI = 0;			/* indicate we have it	 */
		TL0   = 0;	//set time out timer	
		TH0   = 0;
		nTimeOutCounter = 0;
		SFRAH = ADDR.half.ah;
		SFRAL = ADDR.half.al;
		ADDR.nCounter++;
		SFRCN = 0x21;
		TR0   = 1;
		SFRFD = SBUF;
//		PCON  |= 0x01;	//enter idle mode

	}

  if(TI) {                   /* transmitter interrupt active?  */

   TI = 0;                   /* indicate done with it          */
  }

}
extern bit bEndProgFlag;
void Timer0() interrupt 1 using 1
{
//	TR0 	= 0;			//disable Timer 0 
	if(bEndProgFlag)
	{
		TL0 = 0x5a;
		TH0 = 0xff;
		return;
	}
	if(nTimeCountFlag)			//enter program mode and count time?
	{	//timer out?
		if(nTimeOutCounter==20)	//about 0.7s
		{
			//display "Program End and Exit"
		bEndProgFlag = 1;
		SFRAH = 0xff;
		SFRAL = 0xff;
		SFRCN = 0x21;
		TR0   = 1;
		SFRFD = 0;
		nTimeOutCounter++;
		}
		else if(nTimeOutCounter == 21)
		{
			ES = 0;
			TI = 1;
			putstr("Program End, You should manual reset CPU...");
			RI = 0;
			while(!RI);
			CHPENR = 0x87;		//Reset CPU
			CHPENR = 0x59;
			CHPCON = 0x80;
			TR0	   = 0;
		}
		else
			nTimeOutCounter++;
	}
	//else return	
}
void putstr(unsigned char *pStr)
{
	unsigned char i=0;
	while(*(pStr+i))
	{
		putchar(*(pStr+i));
		i++;
/*		TI = 0;
		SBUF = *(pStr+i);
		i++;
		while(!TI);
*/	}
}