lesson11.c

PIC单片机内部SPI通信接口的使用方法（与93c46EEPROM接口）

#include<pic.h>
#define uchar unsigned char
#define uint  unsigned int
#define cs RC2
#define dout RC4
#define nop() asm("nop")
__CONFIG(0x3B31);
const uchar table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                        0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar data_temp;
void delay(uint x);
void init();
void didi(uchar num);
void disp(uchar num1,uchar num2,uchar num3,uchar num4,uchar num5,uchar num6);
void comm(uchar data);
uchar read(uchar add);
void write(uchar add,uchar wdata);
void write_enable();
void main()
{
	uchar a1,a2,a3,a4,a5,a6,i;
	init();
//	write_enable();
//	for(i=6;i>0;i--)
//	{
	//	write_enable();
//		write(i,i);
//	}
	a1=read(1);
	a2=read(2);
	a3=read(3);
	a4=read(4);
	a5=read(5);
	a6=read(6);
	while(1)
	{
		disp(a1,a2,a3,a4,a5,a6);
	}	
}
void delay(uint x)
{
	uint a,b;
	for(a=x;a>0;a--)
		for(b=110;b>0;b--);
}
void init()
{
	TRISD=0;
	TRISA=0;
	TRISC=0x10;//00010000
	TRISE0=0;
	SSPSTAT=0x80;
	SSPCON=0x32;
	cs=0;
}

void write_enable()
{
	cs=1;
	nop();
	comm(0x02);
	comm(0x60);
	cs=0;	nop();	nop();
}

void write(uchar add,uchar wdata)
{
	cs=1;
	nop();
	comm(0x02);
	comm(add|0x80);
	comm(wdata);
	cs=0;
	nop();	nop();
	cs=1;	nop();	nop();
	while(!dout);
	cs=0;	nop();	nop();
}

uchar read(uchar add)
{
	uchar rtemp;
	cs=1;
	nop();
	comm(0x03);
	comm(add);
	comm(0);
	cs=0;
	rtemp=data_temp;
	return (rtemp);
}
void comm(uchar data)
{
	SSPBUF=data;
	while(!SSPIF);
	SSPIF=0;
	data_temp=SSPBUF;
}

void didi(uchar num)
{
	uchar di_num;
	for(di_num=num;di_num>0;di_num--)
	{
		RE0=1;
		delay(50);
		RE0=0;
		delay(20);
	}
}

void disp(uchar num1,uchar num2,uchar num3,uchar num4,uchar num5,uchar num6)
{
	PORTD=table[num1];//显示第一个数码管
	PORTA=0x20;//0010 0000
	delay(2);
	PORTD=table[num2];//显示第二个数码管
	PORTA=0x10;//0001 0000
	delay(2);
	PORTD=table[num3];//显示第三个数码管
	PORTA=0x08;//0000 1000
	delay(2);
	PORTD=table[num4];//显示第四个数码管
	PORTA=0x04;//0000 0100
	delay(2);
	PORTD=table[num5];//显示第五个数码管
	PORTA=0x02;//0000 0010
	delay(2);
	PORTD=table[num6];//显示第六个数码管
	PORTA=0x01;//0000 0001
	delay(2);
}