I am currently working on a microcontroller based system, the issue i am facing is that my inputs pins 40 and 39 of atmega32 are somehow getting internally high, Pin40 shows 2.5 volts and Pin39 shows 5v on my voltmeter. As far as I understand the pins are getting high due to code but I have cross checked several times but still cant figure out the issue with my code.
I am including the circuit diagram and code as well. Can any one please point out how my input pins are showing voltages.
#ifndef F_CPU
#define F_CPU 16000000UL // 16 MHz clock speed
#endif
#define D0 eS_PORTD0
#define D1 eS_PORTD1
#define D2 eS_PORTD2
#define D3 eS_PORTD3
#define D4 eS_PORTD4
#define D5 eS_PORTD5
#define D6 eS_PORTD6
#define D7 eS_PORTD7
#define RS eS_PORTC6
#define EN eS_PORTC7
#include <avr/io.h>
#include <util/delay.h>
#include "lcd.h"
void Init_ADC(void)
{
ADMUX|=(1<<REFS0);
ADMUX&=~((1<<REFS1)|(1<<MUX0)|(1<<MUX1)|(1<<MUX2)|(1<<MUX3)|(1<<MUX4));
// SELECTING CHANNEL0
ADCSRA|=(1<<ADEN)|(1<<ADPS2)|(1<<ADPS0);
// NORMAL CONVERSION WITHOUT INTERRUPT
ADCSRA&=~((1<<ADSC)|(1<<ADATE)|(1<<ADIF)|(1<<ADIE)|(1<<ADPS1));
// CLOCK/32 SPEED
}
unsigned int Read_ADC(uint8_t ch)
{
ADMUX&=0b11111000;
ch=ch&0b00000111;
ADMUX|=ch;
//Start Single Conversion
ADCSRA|= (1<<ADSC);
// Wait for conversion to complete
while(ADCSRA & (1<<ADSC));
// Clear ADIF by writing one to it
//ADCSRA|=(1<<ADIF);
return(ADCW);
}
void Wait()
{
uint8_t i;
for(i=0;i<20;i++)
_delay_loop_2(0);
}
int main(void)
{
int v,v1,v2,vref;
vref = 409;
DDRD = 0xFF;
DDRB = 0xFF;
DDRC = 0xFF;
Init_ADC();
Lcd8_Init();
while(1)
{
v2 = Read_ADC(1);
if(v2>=900)
{
Lcd8_Set_Cursor(1,1);
vref = Read_ADC(0);
Lcd8_Write_String(" Ref. Set");
_delay_ms(2000);
Lcd8_Clear();
}
else
{
Lcd8_Set_Cursor(1,1);
v1=Read_ADC(0);
if(v1>=1.05*vref)
{
v=0x01;
Lcd8_Write_String(" HIGH");
}
else if(v1<=0.95*vref)
{
v=0x01;
Lcd8_Write_String(" LOW");
}
else
{
v=0x00;
Lcd8_Write_String(" OK");
}
PORTB=v;
//Wait();
_delay_ms(2000);
Lcd8_Clear();
}
}
}
Thnks everyone in advance !!
