master_sci.c

实现单片机与单片机的SCI通信

#include 	<at898252.h>
#include 	<intrins.h>

sfr	IPH		= 0xB7;	//

sbit S0		= P3^2;	//SPI通讯中从机选择脚0
sbit S1		= P3^3;	//SPI通讯中从机选择脚1
sbit DIS	= P3^4;	//显示内容使能脚
sbit DUAN	= P3^5;	//位显示使能脚
sbit KEY0	= P2^0;	//按键
sbit KEY1	= P2^1;
sbit KEY2	= P2^2;
sbit KEY3	= P2^3;
sbit KEY4	= P2^4;
sbit KEY5	= P2^5;
sbit KEY6	= P2^6;
sbit KEY7	= P2^7;

#define		T2_H	0xf8	//定时器2在24MHz晶振下定时时间为1mS
#define		T2_L	0x30
#define		T1_V	0xff	//定时器1在24MHz晶振下设定波特率为1152000bit/S

unsigned char code dis_byte[17] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71, 0x00};
unsigned char code dis_bit[8] = {0xfe, 0xfd, 0xfb, 0xf7, 0xef, 0xdf, 0xbf, 0x7f};

unsigned int i;
unsigned char first_key, sec_key, last_key, key;
unsigned char dis_num;
unsigned char dis_buf[8] = {16, 16, 16, 16, 16, 16, 16, 16};
unsigned char times;
unsigned char scan_key_time;
unsigned char sendtimes;
unsigned char se_dat, re_dat, error;
#define	send_char_time() {_nop_(); _nop_(); _nop_(); _nop_(); _nop_(); _nop_();}
#define	delay9() {_nop_();	_nop_();	_nop_();	_nop_();	_nop_();	_nop_();	_nop_();	_nop_();	_nop_();}
#define	delay38() {_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();\
				   _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();\
				   _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();\
				   _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();}

void init(void){
	IE = 0;	//关闭所有中断
	P0 = 255;	P1 = 255;	P3 = 0xf3;	P2 = 255;	//初始化输入输出端口

	/*********SPI设置****************/
//	SPCR = 0x11; 	//CPOL = 0,CPHA = 0,master mode,先高位后低位,6Mbit/s  /0x51
//	SPCR |= 0x40;
//	SPSR &= 0x1c;	//clear interrupt mark
//	ES = 1;

	/*********SCI设置****************/
	//设定定时器1为自动再装入模式，定时器0为16位计数器，两定时器均不允许中断
	TMOD = 0x20;
	TL1 = T1_V;	TH1 = T1_V;	TR1 = 1;	ET1 = 0;
	PCON |= 0x80;	SCON = 0x50;	ES = 1;						//设定SMOD为1,串行通讯模式1,允许串行中断

	//定时器2设置
	RCAP2H = T2_H;
	RCAP2L = T2_L;
	T2CON = 0X04;
	T2MOD &= 0XFF;
	ET2 = 1;

	IPH = 0x10;			//SPI中断优先级高
	IP = 0x10;
	EA = 1;				//开总中断
}

//定时器2的中断服务程序
void system_time(void) interrupt 5 using 1{
	TF2 = 0;
	if(!scan_key_time--){
		first_key = 0;	//
		//扫描键盘
		P2 = 255; KEY4 = 0;
		if(!KEY0) first_key = 1;
		else if(!KEY1) first_key = 2;
		else if(!KEY2) first_key = 3;
		else if(!KEY3) first_key = 4;
		else{
			KEY4 = 1;	KEY5 = 0;
			if(!KEY0) first_key = 5;
			else if(!KEY1) first_key = 6;
			else if(!KEY2) first_key = 7;
			else if(!KEY3) first_key = 8;
			else{
				KEY5 = 1;	KEY6 = 0;
				if(!KEY0) first_key = 9;
				else if(!KEY1) first_key = 10;
				else if(!KEY2) first_key = 11;
				else if(!KEY3) first_key = 12;
				else{
					KEY6 = 1;	KEY7 = 0;
					if(!KEY0) first_key = 13;
					else if(!KEY1) first_key = 14;
					else if(!KEY2) first_key = 15;
					else if(!KEY3) first_key = 16;
					KEY7 = 1;	
				}
			}
		}
		if((sec_key != first_key) && (first_key != last_key)){ //有新按键
			last_key = first_key;
			key = first_key; 
			times = 50;
		}
		sec_key = first_key;
		if(!times--){sec_key = 0; last_key = 0;} //如按键在一定时间内还未松开,则认为是一新按键
		scan_key_time = 10;	//10mS扫描一次键盘
	}
    if(first_key == 0x00){
	P0 = dis_byte[dis_buf[dis_num]];	DIS = 1; DIS = 0;	//显示位码
	P0 = dis_bit[dis_num];	DUAN = 1; DUAN = 0;				//显示段码
	dis_num++;
	if(dis_num == 8) dis_num = 0; 
    }
    }

void send_sci(void) interrupt 4 using 1{
	if(TI) TI = 0;w19851122j
	
	if(RI){
		dis_buf[7] =  SBUF;
		RI = 0;
	}
	if(SPSR & 0x80){ACC = SPSR;	re_dat = SPDR;}
}

void receive_sci(void) interrupt 4 using 3{
  if(TI) TI=0;
  if(RI){
   dis_buf[2] = SBUF;
   RI=0;
  }
    if(SPSR & 0x80){ACC = SPSR; re_dat = SPDR;}
}
  
void main(void){
	init();
	dis_num = 0;
	times = 10;
	while(1){
		if(key){dis_buf[0] = key; SBUF = key; key = 0;}
	}
}