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142 lines
3.3 KiB
142 lines
3.3 KiB
#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/interrupt.h>
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#define TEMP_PIN 0
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#define IMPULS0_PIN 1
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#define IMPULS1_PIN 2
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#define TAST_PIN 3
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#define FET0_PIN 0
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#define FET1_PIN 1
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#define TIMEOUT 255
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uint8_t led_color = 0;
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uint8_t setting_timeout = 0;
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uint8_t adc_pos = 0;
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uint16_t adc_sum = 0;
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uint16_t temperature = 0;
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uint16_t target = 0;
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uint8_t heat_pwm = 0;
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uint8_t heat_on[2] = {0, 0};
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uint8_t heat_off[2] = {0, 0};
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uint8_t input_state = 0;
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uint8_t dev_state = 0;
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/* gray code to change lookup table, index is old state .. new state */
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int8_t state_change[16] = {0, 1, -1, 0, -1, 0, 0, 1, 1, 0, 0, -1, 0, -1, 1, 0};
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ISR(TIM1_OVF_vect)
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{
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/* timeout for displaying target temperature */
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if(setting_timeout) {setting_timeout--;}
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/* incremtening softpwm, toggling output if needed */
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heat_pwm++;
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if(heat_pwm == heat_on[0]) {PORTB |= (1 << FET0_PIN);}
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if(heat_pwm == heat_off[0]) {PORTB &= ~(1 << FET0_PIN);}
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if(heat_pwm == heat_on[1]) {PORTB |= (1 << FET1_PIN);}
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if(heat_pwm == heat_off[1]) {PORTB &= ~(1 << FET1_PIN);}
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}
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ISR(PCINT0_vect)
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{
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uint8_t new_state = (PORTA & ((1 << IMPULS1_PIN) | (1 << IMPULS0_PIN) | (1 << TAST_PIN))) >> 1;
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uint8_t diff = new_state ^ input_state;
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if(!diff) {return;}
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if(diff & (1 << TAST_PIN) && new_state & (1 << TAST_PIN))
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{
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dev_state = !dev_state;
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}
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int8_t change = state_change[((input_state & 3) << 2) | (new_state & 3)];
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if(change)
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{
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target += change;
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setting_timeout = TIMEOUT;
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}
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input_state = new_state;
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}
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void io_init(void)
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{
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PORTA = (1 << TAST_PIN) | (1 << IMPULS1_PIN) | (1 << IMPULS0_PIN);/* enable pullups on inputs */
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PORTB = 0;
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DDRA = (1 << PA7);/* led outputs ... */
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DDRB = (1 << PB2) | (1 << FET0_PIN) | (1 << FET1_PIN);/* ... and FET output */
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input_state = PORTA & ((1 << IMPULS1_PIN) | (1 << IMPULS0_PIN) | (1 << TAST_PIN));
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}
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void led_init(void)
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{
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TCCR0A = (1 << COM0A1) | (1 << COM0B1) | (1 << COM0B0) | (1 << WGM01) | (1 << WGM00);/* pwm enable: fast, A not inverted, B inverted */
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TCCR0B = (1 << CS02) | (1 << CS00);/* prescaler / 1024 */
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OCR0A = OCR0B = led_color;
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}
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void led_set(uint16_t value)
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{
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OCR0A = OCR0B = led_color = value >> 8;
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}
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void adc_init(void)
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{
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ADMUX = (1 << REFS1) | (TEMP_PIN << MUX0);/* Vref = 1.1, pin selection */
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ADCSRA = (1 << ADEN) | (1 << ADATE);/* adc enable, triggered */
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ADCSRB = (1 << ADTS2);/* trigger on counter 0 overflow */
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DIDR0 = (1 << TEMP_PIN);/* disable digital input on adc pin */
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/* result in (ADCH << 8) | ADCL, accessable as ADC? */
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}
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void heat_init(void)
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{
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TCCR1B = (1 << CS12) | (1 << CS10);/* prescaler / 1024 */
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TIMSK1 = (1 << TOIE1);/* interupt on overflow */
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/* insert loading of heat setting here */
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}
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void input_init(void)
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{
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GIMSK = (1 << PCIE0);/* interrupt on change on PORT A */
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PCMSK0 = (1 << TAST_PIN) | (1 << IMPULS1_PIN) | (1 << IMPULS0_PIN);
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}
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int main(void)
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{
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/* if we store the last setting somewhere calculate led_color from it before calling led_init() */
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io_init();
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led_init();
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adc_init();
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heat_init();
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input_init();
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for(;;)
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{
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if(ADCSRA & (1 << ADIF))
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{
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/* new adc result */
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ADCSRA |= (1 << ADIF);
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adc_sum += ADC;
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if(++adc_pos == 64)
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{
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temperature = adc_sum;
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adc_sum = 0;
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adc_pos = 0;
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}
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}
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if(setting_timeout) {led_set(target);}
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else {led_set(temperature);}
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}
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return 0;
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}
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