adc.c: keep ADC enabled

diff --git a/firmware/adc.c b/firmware/adc.c
index 298256f51580efceadda2b7f843bc20aff0119ed..ba30e5ca632c01e8064323d460ce3324fa7dc23a 100644 (file)
--- a/firmware/adc.c
+++ b/firmware/adc.c
@@ -16,8 +16,6 @@ static uint16_t adc1_gain20_offset_x16;
 
 static void inline setup_mux(unsigned char n)
 {
-       ADCSRA |= _BV(ADEN); // enable ADC
-
        /* 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
@@ -100,8 +98,6 @@ void init_adc()
        }
 
        ADCSRA |= _BV(ADIE); // enable IRQ
-
-       ADCSRA &= ~_BV(ADEN); // disable until needed
 }
 
 void susp_adc()
@@ -116,8 +112,6 @@ ISR(ADC_vect) { // IRQ handler
        if (adc_vals)
                // start the next conversion immediately
                ADCSRA |= _BV(ADSC);
-       else
-               ADCSRA &= ~_BV(ADEN); // the last one, disable ADC
 
        if (adc_vals < (1 << sum_shift))
                 // drop the first conversion, use all others