7219.c

用keil51开发的7219程序实现led显示

#include<reg52.h>

sbit din = P1^0;
sbit load = P1^1;
sbit clk = P1^2;

typedef unsigned int uint;
void write(uint dat)   //先写高位,高四位没用，;;;;
{
	int i;
	load = 0;
	clk = 0;
	for(i = 0; i < 4; i ++)
	{
		din = 1;
		clk = 1;
		clk = 0;
	}
	for(i = 0x0800; i > 0; i >>= 1)
	{
		if(dat & i)
			din = 1;
		else
			din = 0;
		clk = 1;
		clk = 0;
	}
	load = 1;
}

void main()
{
	write( 0x0C01 ); /* 置LED为正常状态 */ 
    write( 0x0B02 ); //置LED扫描范围DIGIT0-2w
	write( 0x0A08 ); /* 置LED亮度*/
	write( 0x09ff ); //全译码;
	write( 0x0102);	//第一位是2;;;
	write( 0x0203);
	write( 0x0304);
	while(1);
}