main.c

51 单片机驱动max7219 多位数码管显示程序

#include<reg51.h>
#include"max_7219.h"
//unsigned char voltage;
//void init_timer0();
//void dispaly_alter();
//延时 _ms毫秒
void delay1 (unsigned int ms)
{
	unsigned int i,j;
	for(i=0;i<ms;i++)
		for(j=0;j<90;j++)
			;
}


void main()
{
  float f_a=32.12;
  Init_Max7219(); //initialize max7219 

    
    while(1)
	{
		if(P1^5)f_a-=0.01;
		if((int)(f_a*100)%100==0)f_a-=0.41;
		Show_Max7219_R(f_a);
		delay1(1000);
	}
}