X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=bike-lights.git;a=blobdiff_plain;f=firmware%2Fadc.c;h=b82bc097136d3c70a63defb3290829ecaf3678d3;hp=0ec32af77c0a54db8bbc4b0f8a6ac8476086e15f;hb=1e3c9f876c88582e3da20a51f43d340c40c372ab;hpb=60d17ce8b779c966e6285f1fb9f3de3118752092

diff --git a/firmware/adc.c b/firmware/adc.c
index 0ec32af..b82bc09 100644
--- a/firmware/adc.c
+++ b/firmware/adc.c
@@ -6,8 +6,9 @@
 #define AMBIENT_ADC N_PWMLEDS
 #define BATTERY_ADC (N_PWMLEDS + 1)
 #define ADC1_GAIN20 (N_PWMLEDS + 2)
+#define BUTTON_ADC  (N_PWMLEDS + 2)
 
-#define NUM_ADCS 6
+#define NUM_ADCS 7
 volatile static unsigned char current_adc;
 static uint16_t adc_sum;
 static unsigned char sum_shift;
@@ -42,6 +43,10 @@ static void inline setup_mux(unsigned char n)
 	case 5: // gain stage offset: 1.1V, ADC1,1, gain 20
 		ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX2) | _BV(MUX0);
 		sum_shift = 0; // 1 measurement
+	case 6: // 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;
 	}
 
@@ -94,7 +99,7 @@ void init_adc()
 	// ADCSRB |= _BV(GSEL); // gain 8 or 32
 
 	// Disable digital input on all bits used by ADC
-	DIDR0 = _BV(ADC0D) | _BV(ADC1D) | _BV(ADC2D)
+	DIDR0 = _BV(ADC0D) | _BV(ADC1D) | _BV(ADC2D) | _BV(ADC3D)
 		| _BV(ADC4D) | _BV(ADC5D) | _BV(ADC6D);
 
 	// 1.1V, ADC1,1, gain 20
@@ -160,6 +165,8 @@ ISR(ADC_vect) { // IRQ handler
 		ambient_adc(adc_sum);
 	if (current_adc == BATTERY_ADC)
 		battery_adc(adcval);
+	if (current_adc == BUTTON_ADC)
+		button_adc(adcval);
 	
 	start_next_adc();
 }