static unsigned char adc_mux[] = { // pwmleds should be first
// 0: pwmled 0: 1.1V, ADC3 (PA4), single-ended
_BV(REFS1) | _BV(MUX1) | _BV(MUX0),
static unsigned char adc_mux[] = { // pwmleds should be first
// 0: pwmled 0: 1.1V, ADC3 (PA4), single-ended
_BV(REFS1) | _BV(MUX1) | _BV(MUX0),