max7219.c

温度控制系统——毕业设计

#include "reg52.h"
sbit cs		=	P0^1;
sbit clk	=	P0^2;
sbit din	=	P0^0;
sbit dout	=	P0^3;
unsigned char const num[13]={0x7E,0x30,0x6D,0x79,0x33,0x5B,0x5F,0x70,0x7F,0x7B,0x37,0x0E,0x00};	//0-9,H,L,空格
		
void write_7219(unsigned char add,unsigned char date)
{
	unsigned char m;
	cs=0;
	for(m=0;m<8;m++)
	{
		clk=0;
		if((add&0x80)==0x80)din=1;
		else din=0;
		clk=1;
		add=add<<1;	
	}
	for(m=0;m<8;m++)
	{
		clk=0;
		if((date&0x80)==0x80)din=1;
		else din=0;
		clk=1;
		date=date<<1;
	}
	cs=1;
}
/***写7219的数据位，输入参数为地址，数据，是否小数位***/
void write_7219_data(unsigned char add,unsigned date,bit dot)
{
	date=num[date];
	if(dot)date=date|0x80;
	write_7219(add,date);
}

void ini_7219()
{
	write_7219(0x09,0x00);		//无编码显示模式
	write_7219(0x0a,0x0F);		//开到最亮
	write_7219(0x0b,0x03);		//从0到3位
	write_7219(0x0c,0x01);		//打开显示
	write_7219(0x0f,0x00);		//正常模式
}