/*P89CXX編程器控制CPU接收和控制程序*/
#include <reg52.h>
#include <intrins.h>

unsigned char time,b_break,b_break_3;
//35.555ms
void int_t0(void) interrupt 1 {
	TH0=0;
	if ((++b_break_3)>2) b_break=1;
	time++;
}

void wait20us(void) {
	TL0=180;TH0=0xff;
	time=0;
	while (!time) {}
}
void wait500ms(void) {
	time=0;
	while (time<15) {}
}


unsigned char rec(void) {
	TH0=0;b_break_3=0;b_break=0;
	while (RI==0) {
		if (b_break) return(1);
	}
	RI=0;
	SBUF=SBUF;
	return(SBUF);
}

/*返回1表示失敗*/
bit sen(unsigned char d) {
	SBUF=d;
	TH0=0;b_break_3=0;b_break=0;
	while (RI==0) {
		if (b_break) return(1);
	}
	RI=0;
	if (SBUF!=d) return(1);
	return(0);
}




#define b_init 0

#define b_erase 1
#define b_erase_block 2				//P89C51RC+、P89C51RD+特有
#define b_erase_sbyte_bvec 3		//P89C51RC+、P89C51RD+特有

#define b_read 4

#define b_program_byte 5
#define b_program_sbyte 6			//P89C51RC+、P89C51RD+特有
#define b_program_boot_vector 7		//P89C51RC+、P89C51RD+特有

#define b_lock1 8
#define b_lock12 9
#define b_lock123 10

#define b_cpu 12					//定義需要編程的cpu類型,0:P89C51 1:P89C52 2:P89C54 3:P89C58 4:P89C51RC+ 5:P89C51RD+

sbit p_oe=P3^2;
sbit p_we=P3^3;

//輸入控制模式
void mode(unsigned char m) {
	P3=(m<<4)|0xf;
}
//輸出地址
void out_adds(unsigned int adds) {
	P0=adds;
	P2=adds/256;
}
//讀入地址
unsigned char in_data(void) {
	P1=0xff;
	p_oe=0;
	return(P1);
	p_oe=1;
}
//判別cpu類型
unsigned char code un_cpu[]={0xf4,0xff,0xfb,0xf9,0x89,0x80};
unsigned int code un_adds_max[]={4096,8192,16384,32768,32768,0};
unsigned char read_id(void){
	unsigned char d;
	mode(0xf);
	//讀Mft ID
	out_adds(0);d=in_data();
	if (d!=0x15) return(0);
	//讀Mft ID1
	out_adds(1);d=in_data();
	if (d!=0xc2) return(0);
	//讀Mft ID2
	out_adds(2);d=in_data();
	return(d);		//返回Mft ID2
}

//初始化芯片，等效于擦除芯片、擦除加密位等等
bit init(unsigned char cpu) {
	unsigned char i,b_error=0;
	unsigned int adds,adds_max=un_adds_max[cpu];
	//寫入所有字節全零3次，不校驗
	mode(3);		
	P1=0;
	adds=0;
	do {
		out_adds(adds);
		for (i=0;i<3;i++) {
			p_we=0;
			wait20us();
			p_we=1;
		}
		adds++;
	} while (adds!=adds_max);
	//初始化，校驗，3次機會
	for (i=0;i<3;i++) {
		//初始化
		mode(0xe);
		p_we=0;
		time=0;
		while (time<15) {}
		p_we=1;
		//擦除校驗
		mode(4);
		adds=0;
		do {
			out_adds(adds);
			if (in_data()!=0xff) break;
			adds++;
		} while (adds!=adds_max);
		if (adds==adds_max) break;
	}
	if (i==3) b_error=1;//擦除錯誤
	else {
		mode(9);
		out_adds(0);
		if (in_data()&0x3) b_error=1;
		//P89C51RX專用
		if (cpu>3) {
			out_adds(1);
			if (in_data()) b_error=1;
			out_adds(2);
			if (in_data()) b_error=1;
		}
	}
	sen(b_error);
	return(b_error);
}
//讀入
bit read(unsigned char cpu) {
	unsigned int adds,adds_max=un_adds_max[cpu];
	adds=0;
	mode(0);
	wait20us();
	do {
		out_adds(adds);
		if (sen(in_data())) return(1);	//通信出錯
		adds++;
	} while (adds!=adds_max);
	return(1);	//超出地址范圍,錯誤
}
//編程
bit program_byte(unsigned char cpu) {
	unsigned char d,n;
	unsigned int adds=0,adds_max=un_adds_max[cpu];
	do {
		d=rec();
		if (!b_break) {
			out_adds(adds);
			P1=d;
			n=0;
			while (1) {
				mode(0x3);
				p_we=0;
				wait20us();
				p_we=1;
				mode(0x5);
				if (in_data()!=d) n++; else break;
				if (n>2) return(1);				//編程校驗3次失敗
			}
			adds++;
		} else return(0);					//pc通信超時或編程完成。在此不會區分，但無所謂
	} while (adds!=adds_max);
	return(1);								//地址超出范圍
}

bit lock123(void) {
	unsigned char i,b_error=0;
	unsigned int adds;
	unsigned char code lock_bit[]={2,6,14};
	wait20us();
	for (i=0;i<3;i++) { 
		mode(0x6);
		out_adds(i);
		p_we=0;
		wait20us();
		p_we=1;
		mode(0xb);
		out_adds(0);
		if (in_data()!=lock_bit[i]) {b_error=1;break;}
	}
	if (!b_error) {
		//常規讀檢查前4kb是否加密成功(為了節省時間，只檢查前4kb)
		mode(0);
		for (adds=0;adds<4096;adds++) {
			out_adds(adds);
			if (in_data()!=0xff) {b_error=1;break;}
		}
	}
	sen(b_error);
	return(b_error);							
}


void main(void) {
	unsigned char cpu;
	unsigned char i,start;
	EA=1;
	SCON=0xd8;PCON=0x80;
	TMOD=0x21;
	TL1=TH1=0xff;TR1=1;
	TH0=0;ET0=TR0=1;
	while (1) {
		REN=1;
		start=rec();
		if ((!b_break)&&(start==0x0)) {
			i=rec();
			if (!b_break) {
				switch (i) {
				case b_cpu:
					i=rec();
					if (!b_break) cpu=i;
					wait20us();			//防止電腦處理不過來
					if (un_cpu[i]!=read_id()) sen(1); else sen(0);
					break;
				case b_init:
					if (init(cpu)) wait500ms();			//初始化錯誤或通信錯誤等待1秒，讓pc程序超時并報告錯誤
					break;
				case b_read:
					if (read(cpu)) wait500ms();
					break;
				case b_program_byte:
					if (program_byte(cpu)) wait500ms();	//編程錯誤或通信錯誤等待1秒，讓pc程序超時并報告錯誤
					break;
				case b_lock123:
					if (lock123()) wait500ms();		//加密錯誤或通信錯誤等待1秒，讓pc程序超時并報告錯誤
					break;
				}
			}
		}
	}
}