max7219.c

温度控制系统——毕业设计

#include "reg52.h"
#include "intrins.h"
sbit cs		=	P0^1;
sbit clk	=	P0^2;
sbit din	=	P0^0;
sbit dout	=	P0^3;
void write_7219_data(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;
}
void ini_7219()
{
	write_7219_data(0x09,0xff);		//BCD显示模式
	write_7219_data(0x0a,0x0F);		//开到最亮
	write_7219_data(0x0b,0x07);		//从0到7位
	write_7219_data(0x0c,0x01);		//打开显示
	write_7219_data(0x0f,0x00);		//正常模式
}