基于Atmega16的电压表制作程序+原理图 -

/*****************************************************
Project :
Version :
Date : 2015-10-29
Author :tengzaiba
Chip type : ATmega16
AVR Core Clock frequency: 8.000000 MHz
*****************************************************/
#include <mega16.h>
#include <delay.h>
// Declare your global variables here
char LCD_7[16] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
char dis_buff[4];
unsigned int votage=0;
unsigned int vot1;
// Timer 0 overflow interrupt service routine
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
// Place your code here
// Read the 8 most significant bits
// of the AD conversion result
PORTC.7=~PORTC.7;
delay_us(20);
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
vot1=ADCW;
votage=(unsigned long)vot1*5000/1024;
}
void display(unsigned int vot)
{
// move vot to dis_buff
char i;
char j;
for (i=0;i<4;i++)
{
dis_buff[i]=vot % 10;
vot/=10;
}
// dis_buff to LEDs
for (j=0;j<=3;j++)
{
PORTC=LCD_7[dis_buff[j]];
PORTA=~(1<<j);
delay_ms(2);
PORTA=0x0f;
}
}
void main(void)
{
// Declare your local variables here
// Input/Output Ports initialization
// Port A initialization
// Func7=In Func6=In Func5=In Func4=In Func3=Out Func2=Out Func1=Out Func0=Out
// State7=T State6=T State5=T State4=T State3=0 State2=0 State1=0 State0=0
PORTA=0x00;
DDRA=0x0F;
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTB=0x00;
DDRB=0x00;
// Port C initialization
// Func7=In Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
// State7=T State6=0 State5=0 State4=0 State3=0 State2=0 State1=0 State0=0
PORTC=0x00;
DDRC=0xFF;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=FFh
// OC0 output: Disconnected
TCCR0=0x03;
TCNT0=0x00;
OCR0=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
// INT2: Off
MCUCR=0x00;
MCUCSR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x01;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
// ADC initialization
// ADC Clock frequency: 1000.000 kHz
// ADC Voltage Reference: AREF pin
// ADC Auto Trigger Source: Timer0 Overflow
// Only the 8 most significant bits of
// the AD conversion result are used
ADMUX=0x47;
ADCSRA=0xA3;
SFIOR&=0x1F;
SFIOR|=0x80;
// Global enable interrupts
#asm("sei")
while (1)
{
display(votage);
};
}

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