#include "lights.h"
+/* ADC numbering: PWM LEDs first, then ambient light sensor, battery sensor */
static unsigned char adc_mux[] = { // pwmleds should be first
// 0: pwmled 0: 1.1V, ADC3 (PA4), single-ended
_BV(REFS1) | _BV(MUX1) | _BV(MUX0),
_BV(REFS1) | _BV(MUX2) | _BV(MUX0),
};
-#define LAST_ADC (sizeof(adc_mux)/sizeof(char))
-volatile static unsigned char current_adc = LAST_ADC;
+#define AMBIENT_ADC N_PWMLEDS
+#define BATTERY_ADC (N_PWMLEDS + 1)
+
+#define LAST_ADC (sizeof(adc_mux)/sizeof(adc_mux[0]))
+volatile static unsigned char current_adc;
+static unsigned char adc_ignore;
static void start_next_adc()
{
--current_adc;
// test if current_adc should be measured
- if (current_adc < N_PWMLEDS && pwmled_is_on(current_adc))
+ if (current_adc < N_PWMLEDS && pwmled_needs_adc(current_adc))
+ goto found;
+ if (current_adc == AMBIENT_ADC)
goto found;
- // TODO ambient light, battery sense, etc.
+ // TODO battery sense, etc.
}
// all ADCs have been handled
found:
// ADCSRB |= _BV(GSEL); // gain 8 or 32
ADMUX = adc_mux[current_adc]; // set up mux, start one-shot conversion
+ adc_ignore = 1; // ignore first reading after mux change
ADCSRA |= _BV(ADSC);
}
void init_adc()
{
+ current_adc = LAST_ADC;
+ adc_ignore = 1;
+
ADCSRA = _BV(ADEN) // enable
| _BV(ADPS1) | _BV(ADPS0) // CLK/8 = 125 kHz
// | _BV(ADPS2) // CLK/16 = 62.5 kHz
ISR(ADC_vect) { // IRQ handler
uint16_t adcval = ADCW;
+#if 0
+ log_byte(0xF3);
+ log_byte(current_adc);
+ log_word(adcval);
+#endif
+
+ if (adc_ignore) {
+ ADCSRA |= _BV(ADSC);
+ adc_ignore = 0;
+ return;
+ }
+
if (current_adc < N_PWMLEDS)
pwmled_adc(current_adc, adcval);
- // TODO ambient light, battery sense, etc.
+ if (current_adc == AMBIENT_ADC)
+ ambient_adc(adcval);
+ // TODO battery sense, etc.
start_next_adc();
}