disp._c

电压计(c语言编写的) 通过led灯显示 电路图说明： 1、R1、R2、D1、D2 组成发光二极管显示

#include <iom8v.h> //和单片机类型相对应的头文件，选择Atmega8做实验；
#include <macros.h>
#include <stdio.h>
#define uchar unsigned char
#define uint unsigned int
void send_byte(uchar x);
void disp_led(uchar buffer,uchar control);
void delay_1ms(void); 
void delay_nms(unsigned int n);
uchar  disp_table[16] = {
	0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
	0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uint count;
void main(void)
{   
    uint i;
	int j;
  	OSCCAL=0X9d;//系统时钟校准，不同的芯片和不同的频率，
  	DDRB=0x03; //定义B口的PB0、PB1为输出口
  	DDRC=0x30;
	WDR();       //看门狗计数清零
    WDTCR=0x0F;  //使能watchdog,并且，采用2048K分频，典型溢出时间5V时2.1S
    ADCSRA=0X00;
	ADCSRA = 0x00; 
    ADMUX =(1<<REFS0)|(1<<REFS1)|(1<<MUX1)|(1<<MUX0);
    ADCSRA=(1<<ADEN)|(1<<ADSC)|(1<<ADIE)|(1<<ADPS2)|(1<<ADPS1) ;//64分频
	SEI();
  	//PORTB=0B00000001; //PB0口输出高电平，PB1口输出低电平，绿灯亮
  	delay_nms(5000); //延时5秒
  	PORTB=0B00000010; //PB1口输出高电平，PB0口输出低电平，关闭绿灯，红灯亮
  	delay_nms(5000); //延时5秒
	disp_led(4,0);
  	while(1) 
     {       
	         PORTB=0B00000000;
	  		 delay_nms(100);
			 j=((25600/1023)*(ADCH*256+ADCL))/1000;
			 count=j;
			 if(j>24)
			 PORTB=0B00000011; //翻转PB0和PB1口
			 disp_led(0,1);
    }
}
void send_byte(uchar x)
{
	uchar i;
 	for(i=0;i<8;i++)
 	{
 		PORTC=0<<5;
		if((x&(1<<(7-i))))
		PORTC=1<<4;
		else
		PORTC=0<<4;
		PORTC=1<<5;
	}
}
void disp_led(uchar buffer,uchar control)
{
	uchar i,temp[6];
	uint tempcount;
	switch(control)
	{
		case 0:		//test
		{
			for(i=0;i<11;i++)
			send_byte(disp_table[buffer%10]);//显示数字
			break;
		}
		case 1:		//display count
		{
			tempcount=count;
			for(i=0;i<6;i++)
			{
				temp[i]=tempcount%10;
				tempcount/=10;
			}
			send_byte(disp_table[buffer/10]);
			send_byte(disp_table[buffer%10]);
			send_byte(0x00);
			send_byte(0x00);
			send_byte(0x00);
			for(i=0;i<6;i++)
			send_byte(disp_table[temp[5-i]]);
			break;
		}
	}
	PORTC=1<<4;
}
void delay_1ms(void)//1ms延时函数
{
  unsigned int i;
  for (i=0;i<150;i++)
  {
  WDR(); 
  } 
}
void delay_nms(unsigned int n)//延时n毫秒
{
  unsigned int i;
  for (i=0;i<n;i++)//执行n次1毫秒延时
  delay_1ms(); 
  WDR(); 
}
//ADC完成中断
#pragma interrupt_handler adc_isr:iv_ADC     
void adc_isr(void)
{
 ADMUX =(1<<REFS0)|(1<<REFS1)|(1<<MUX1)|(1<<MUX0);
 ADCSRA|=(1<<ADSC);//启动AD转换
}