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//#define F_CPU 7372800UL
#include <stdint.h>
#include <string.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <avr/pgmspace.h>
#include <avr/eeprom.h>
#include <util/delay.h>
#include "serial.h"
#include "stdio.h"
#include "pid.h"
/* port D
*
* 4 1- (NMOS, inverted)
* 5 1+ (PMOS)
* 6 2- (NMOS, inverted)
* 7 2+ (PMOS)
*
*/
#define D_1_MINUS (1 << 4)
#define D_1_PLUS (1 << 5)
#define D_2_MINUS (1 << 6)
#define D_2_PLUS (1 << 7)
const int target_temp = 30;
volatile uint16_t adc_res;
volatile uint8_t adc_new;
struct PID_DATA pid_data;
/* Turns the H-bridge off, putting the output
* into high impedance mode. */
static void bridge_off(void)
{
PORTD |= D_1_MINUS | D_2_MINUS;
PORTD &= ~(D_1_PLUS | D_2_PLUS);
}
/* Turns the H-bridge on, setting 1+ 2- */
static void bridge_on_heat(void)
{
bridge_off();
_delay_ms(100);
PORTD |= D_1_PLUS;
PORTD &= ~D_2_MINUS;
}
/* Turns the H-bridge on, setting 1- 2+ */
static void bridge_on_cool(void)
{
bridge_off();
_delay_ms(100);
PORTD |= D_2_PLUS;
PORTD &= ~D_1_MINUS;
}
/* Initializes the output port needed for the H-bridge */
static void bridge_init(void)
{
bridge_off();
DDRD |= D_1_PLUS | D_1_MINUS | D_2_PLUS | D_2_MINUS;
}
/* initializes ADC */
static void adc_init(void)
{
adc_new = 0;
ADMUX = (1 << REFS1) | (1 << REFS0);
/* select channel x (0 for now) */
ADMUX |= 0x0;
ADCSRA = (1 << ADEN) | (1 << ADIE) | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0);
}
/* reads ADC */
static void start_temp_conv(void)
{
ADCSRA |= (1<<ADSC);
}
/* ADC completion interrupt */
ISR(ADC_vect)
{
adc_res = ADCW;
adc_new = 1;
}
/* ADC results to temperature conversion routine */
int adc_to_centigrade(uint16_t adc_val) {
return 0;
}
/* Initializes TIMER1 */
static void timer_init(void)
{
TCCR1B = (1 << WGM12) | (1 << CS12) | (1 << CS10);
OCR1A = 7200;
TIMSK|=(1<<OCIE1A);
}
ISR(TIMER1_COMPA_vect)
{
serial_send("*\r\n", 3, 1);
start_temp_conv();
}
int main(void)
{
char params[12];
serial_init();
adc_init();
timer_init();
bridge_init();
sei();
bridge_on_cool();
while (1) {
if (adc_new) {
sprintf(params, "%u\r\n", adc_res);
serial_send(params, strlen(params), 1);
adc_new = 0;
}
_delay_ms(100);
}
}
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