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ADC.c
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ADC.c
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/************************************************************************************
* Gonzalo Alberto Guajardo Galindo
* Device: Atmega328P
* Rev: 1
* Date: 11/13/22
* Description: Controls a 7-segment display using an Atmega328P.
* Reads an analog value from an ADC and displays different patterns on the display.
************************************************************************************/
// Libraries
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
// Constants
#define F_CPU 1600000UL
// Macros
#define DISPLAY PORTB
#define SCANNING_PORT PORTC
#define THOUSANDS_PIN PINC0 // Thousands
#define THOUSANDS_PIN_ON SCANNING_PORT &=~_BV(THOUSANDS_PIN)
#define THOUSANDS_PIN_OFF SCANNING_PORT |= _BV(THOUSANDS_PIN)
#define HUNDREDS_PIN PINC1 // Hundreds
#define HUNDREDS_PIN_ON SCANNING_PORT &=~_BV(HUNDREDS_PIN)
#define HUNDREDS_PIN_OFF SCANNING_PORT |= _BV(HUNDREDS_PIN)
#define TENS_PIN PINC2 // Tens
#define TENS_PIN_ON SCANNING_PORT &=~_BV(TENS_PIN)
#define TENS_PIN_OFF SCANNING_PORT |= _BV(TENS_PIN)
#define UNITS_PIN PINC3 // Units
#define UNITS_PIN_ON SCANNING_PORT &=~_BV(UNITS_PIN)
#define UNITS_PIN_OFF SCANNING_PORT |= _BV(UNITS_PIN)
// Functions
void init_ports (void); // Initializes ports
void init_timer0(void); // Initializes Timer0
void on_timer0 (void); // Turns on Timer0
void off_timer0 (void); // Turns off Timer0
void ADC_init (void); // Initializes ADC
void ADC_on (void); // Turns on ADC
// Global Variables
volatile uint8_t thousands; // Thousands place
volatile uint8_t hundreds; // Hundreds place
volatile uint8_t tens; // Tens place
volatile uint8_t units; // Units place
volatile uint8_t i = 0; // Counter variable
// Main
int main(void)
{
cli();
init_ports();
init_timer0();
ADC_init();
sei();
on_timer0();
while (1)
{
ADC_on();
if (i == 0)
{
DISPLAY = thousands;
SCANNING_PORT = ~(1<< i);
}
else if (i == 1)
{
DISPLAY = hundreds;
SCANNING_PORT = ~(1<< i);
}
else if (i == 2)
{
DISPLAY = tens;
SCANNING_PORT = ~(1<< i);
}
else if (i == 3)
{
DISPLAY = units;
SCANNING_PORT = ~(1<< i);
}
if (i >= 3)
{
i = 0;
}
else
{
i++;
}
}
}
// Function definitions
void init_ports(void)
{
// Outputs
DDRB |= 0xFF;
PORTB |= 0X00;
DDRC |= _BV(THOUSANDS_PIN)|_BV(HUNDREDS_PIN)|_BV(TENS_PIN)|_BV(UNITS_PIN);
}
// Timer
void init_timer0(void)
{
// CTC Mode
TCCR0B &= ~_BV(WGM02); // 0
TCCR0A |= _BV(WGM01); // 1
TCCR0A &= ~_BV(WGM00); // 0
// Prescaler 1024
TCCR0B |= _BV(CS02);
TCCR0B &=~ _BV(CS01);
TCCR0B |= _BV(CS00);
// TOP 0.1 second
OCR0A = 156;
// ENABLE
TIMSK0 |= _BV(OCIE0A);
}
void on_timer0 (void)
{
// Reset count
TCNT0 = 0;
// Prescaler 1024
TCCR0B |= _BV(CS02); // 1
TCCR0B &= ~_BV(CS01); // 0
TCCR0B |= _BV(CS00); // 1
}
void off_timer0(void)
{
// STOP
TCCR0B &= ~_BV(CS02); // 0
TCCR0B &= ~_BV(CS01); // 0
TCCR0B &= ~_BV(CS00); // 0
}
ISR (TIMER0_COMPA_vect)
{
if (i >= 3)
{
i = 0;
}
else
{
i++;
}
}
// ADC
void ADC_init(void)
{
// AVCC as reference pin---AVCC reference
ADMUX &= ~_BV(REFS1); //1
ADMUX |= _BV(REFS0); //0
// Adjust to 8 bits
ADMUX |= (1<<ADLAR); // Only using 8 bits out of 10
// Choose PIN to read ADC5
ADMUX &=~_BV(MUX3); //1
ADMUX |= _BV(MUX2); //0
ADMUX &=~_BV(MUX1); //1
ADMUX |= _BV(MUX0); //0
// Free running
ADCSRA |= _BV(ADATE);
// Enable interrupt
ADCSRA |= _BV(ADIE);
// 1 MHz clock / 8 = 125 kHz ADC
ADCSRA &=~ (1<<ADPS0); //1
ADCSRA |= (1<<ADPS1); //0
ADCSRA |= (1<<ADPS2); //0
}
void ADC_on(void)
{
// Turn on ADC
ADCSRA |= _BV(ADEN);
_delay_ms(20);
// Start conversion
ADCSRA |= _BV(ADSC);
}
ISR(ADC_vect)
{ // ADC signal is handled within the range of 0 to 255
if (ADCH >= 0 && ADCH <= 50)
{
thousands = 0x7C; // b
hundreds = 0XF7; // A
tens = 0x0E; // J
units = 0XF7; // A
}
if (ADCH >= 51 && ADCH <= 100)
{
thousands = 0x7C; // b
hundreds = 0X06; // I
tens = 0xF9; // E
units = 0X54; // n
}
if (ADCH >= 101 && ADCH <= 255)
{
thousands = 0XF7; // A
hundreds = 0X38; // L
tens = 0x78; // t
units = 0XF7; // A
}
}