- case 0: // pwmled 1: 1.1V, ADC0,1 (PA0,1), gain 20
- ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX1) | _BV(MUX0);
- break;
- case 1: // pwmled 2: 1.1V, ADC2,1 (PA2,1), gain 20
- ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
- break;
- case 2: // pwmled 3: 1.1V, ADC4 (PA5), single-ended
- ADMUX = _BV(REFS1) | _BV(MUX2);
- break;
- case AMBIENT_ADC: // ambient light: 1.1V, ADC5 (PA6), single-ended
- ADMUX = _BV(REFS1) | _BV(MUX2) | _BV(MUX0);
- break;
- case BATTERY_ADC: // batt voltage: 1.1V, ADC6 (PA7), single-ended
- ADMUX = _BV(REFS1) | _BV(MUX2) | _BV(MUX1);
- break;
- case ADC1_GAIN20: // gain stage offset: 1.1V, ADC1,1, gain 20
- ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX2) | _BV(MUX0);
- break;
- case BUTTON_ADC: // buttons: 1.1V, ADC3, single-ended
- PORTA |= _BV(PA3); // +5V to the voltage splitter