battery measurements (off, on)
[heater.git] / firmware / main.c
index 9a04150..fcb7426 100644 (file)
@@ -7,7 +7,9 @@
 
 #include "logging.h"
 
-static unsigned char pwm = 1;
+#define N_STEPS 5
+static unsigned char steps[] = { 60, 85, 121, 171, 242 };
+static unsigned char intensity = 0;
 
 static void timer_init()
 {
@@ -15,10 +17,32 @@ static void timer_init()
 
        DDRB |= _BV(PB4);
 
-       TCCR1 = _BV(CS10); // clk/1 = 1 MHz
-       // TCCR1 = _BV(CS11) | _BV(CS13); // clk/512 = 2 kHz
+       // TCCR1 = _BV(CS10); // clk/1 = 1 MHz
+       TCCR1 = _BV(CS11) | _BV(CS13); // clk/512 = 2 kHz
        GTCCR = _BV(COM1B1) | _BV(PWM1B);
        OCR1C = 255;
+       OCR1B = steps[0];
+       TIMSK = _BV(OCIE1B) | _BV(TOIE1);
+}
+
+volatile unsigned char adc_type, adc_drop;
+
+ISR(TIM1_OVF_vect)
+{
+       adc_drop = 2;
+       adc_type = 1;
+       ADCSRA |= _BV(ADSC);
+}
+
+ISR(TIM1_COMPB_vect)
+{
+       adc_drop = 2;
+       adc_type = 0;
+       ADCSRA |= _BV(ADSC);
+}
+
+static void set_pwm(unsigned char pwm)
+{
        OCR1B = pwm;
 }
 
@@ -26,11 +50,38 @@ static void adc_init()
 {
        power_adc_enable();
 
-       ADCSRA = _BV(ADEN) | _BV(ADPS1) | _BV(ADPS0); // clk/8 = 125 kHz
+       ADCSRA = _BV(ADEN) | _BV(ADPS1) | _BV(ADPS0) | _BV(ADIE); // clk/8 = 125 kHz
        ADMUX = _BV(REFS1) | _BV(MUX1) | _BV(MUX0); // 1.1V ref., PB3 single-ended
        DIDR0 = _BV(ADC3D);
 }
 
+volatile uint16_t batt_on, batt_off;
+
+ISR(ADC_vect)
+{
+       uint16_t adcw = ADCW;
+
+       if (adc_drop) {
+               adc_drop--;
+               ADCSRA |= _BV(ADSC);
+               return;
+       }
+
+       if (adc_type == 0) {
+               if (batt_off) {
+                       batt_off += adcw - (batt_off >> 5);
+               } else {
+                       batt_off = adcw << 5;
+               }
+       } else {
+               if (batt_on) {
+                       batt_on += adcw - (batt_on >> 5);
+               } else {
+                       batt_on = adcw << 5;
+               }
+       }
+}
+
 static void status_led_init()
 {
        DDRB |= _BV(PB2);
@@ -47,6 +98,11 @@ static void status_led_off()
        PORTB &= ~_BV(PB2);
 }
 
+static unsigned char status_led_is_on()
+{
+       return PORTB & _BV(PB2) ? 1 : 0;
+}
+
 static void buttons_init()
 {
        DDRB &= ~(_BV(PB0) | _BV(PB1)); // set as input
@@ -160,9 +216,8 @@ static void power_down()
 
 static void button_one_pressed()
 {
-       if (pwm > 1) {
-               pwm >>= 1;
-               OCR1B = pwm;
+       if (intensity > 0) {
+               set_pwm(steps[--intensity]);
        } else {
                power_down();
        }
@@ -170,9 +225,8 @@ static void button_one_pressed()
 
 static void button_two_pressed()
 {
-       if (pwm < 0x80) {
-               pwm <<= 1;
-               OCR1B = pwm;
+       if (intensity < N_STEPS-1) {
+               set_pwm(steps[++intensity]);
        }
 }
 
@@ -207,23 +261,39 @@ static void timer_check_buttons()
        button_state = newstate;
 }
 
+static unsigned char blink_on_time, blink_off_time, n_blinks;
+static unsigned char blink_counter;
+
+static void timer_blink()
+{
+       if (blink_counter) {
+               blink_counter--;
+       } else if (status_led_is_on()) {
+               status_led_off();
+               blink_counter = blink_off_time;
+       } else if (n_blinks) {
+               --n_blinks;
+               status_led_on();
+               blink_counter = blink_on_time;
+       } else {
+               n_blinks = intensity + 1;
+               blink_on_time = 0;
+               blink_off_time = 2;
+               blink_counter = 10;
+#if 0
+               log_byte(0xbb);
+               log_byte(batt_on >> 7);
+               log_byte(batt_off >> 7);
+#endif
+       }
+}
+
 int main()
 {
        log_init();
 
        power_down();
 
-#if 0
-       ADCSRA |= _BV(ADSC);
-       while (!(ADCSRA & _BV(ADIF)))
-               ;
-       log_word(ADCW);
-       ADCSRA |= _BV(ADSC);
-       while (!(ADCSRA & _BV(ADIF)))
-               ;
-       log_word(ADCW);
-       log_flush();
-#endif
        sei();
 
        // we try to be completely IRQ-driven, so just wait for IRQs here
@@ -239,6 +309,8 @@ int main()
                if (wdt_timer_fired) {
                        wdt_timer_fired = 0;
                        timer_check_buttons();
+                       timer_blink();
+                       log_flush();
                }
        }
 }