- while (current_adc > 0) {
- --current_adc;
-
- // test if current_adc should be measured
- if (current_adc < N_PWMLEDS && pwmled_needs_adc(current_adc))
- goto found;
- if (current_adc == AMBIENT_ADC)
- goto found;
- // TODO battery sense, etc.
+ /* ADC numbering: PWM LEDs first, then ambient light sensor, battery sensor */
+ switch (n) {
+ case 0: // pwmled 1: 1.1V, ADC0,1 (PA0,1), gain 20
+ ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX1) | _BV(MUX0);
+ sum_shift = PWMLED_ADC_SHIFT;
+ break;
+ case 1: // pwmled 2: 1.1V, ADC2,1 (PA2,1), gain 20
+ ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
+ sum_shift = PWMLED_ADC_SHIFT;
+ break;
+ case 2: // pwmled 3: 1.1V, ADC4 (PA5), single-ended
+ ADMUX = _BV(REFS1) | _BV(MUX2);
+ sum_shift = PWMLED_ADC_SHIFT;
+ break;
+ case AMBIENT_ADC: // ambient light: 1.1V, ADC5 (PA6), single-ended
+ ADMUX = _BV(REFS1) | _BV(MUX2) | _BV(MUX0);
+ sum_shift = 3; // 3 measurements
+ break;
+ case BATTERY_ADC: // batt voltage: 1.1V, ADC6 (PA7), single-ended
+ ADMUX = _BV(REFS1) | _BV(MUX2) | _BV(MUX1);
+ sum_shift = 0; // 1 measurement
+ break;
+ case ADC1_GAIN20: // gain stage offset: 1.1V, ADC1,1, gain 20
+ ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX2) | _BV(MUX0);
+ sum_shift = 0; // 1 measurement
+ break;
+ case BUTTON_ADC: // buttons: 1.1V, ADC3, single-ended
+ PORTA |= _BV(PA3); // +5V to the voltage splitter
+ ADMUX = _BV(REFS1) | _BV(MUX1) | _BV(MUX0);
+ sum_shift = 0;
+ break;