X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=tinyboard.git;a=blobdiff_plain;f=projects%2Fstep-up%2Fadc.c;h=55cd8610ab441cacc7663ddc8e605dde49869d7c;hp=194b00e0b0de070d3ab0369b287560df8f93f37a;hb=HEAD;hpb=8b54d4bdf1305a636d6c1d03e6a725061f47c612

diff --git a/projects/step-up/adc.c b/projects/step-up/adc.c
index 194b00e..55cd861 100644
--- a/projects/step-up/adc.c
+++ b/projects/step-up/adc.c
@@ -5,12 +5,14 @@
 
 #include "lights.h"
 
-#define ZERO_ADC    1
+#define ZERO_ADC    2
 
 //#define NUM_ADCS	ZERO_ADC
-#define NUM_ADCS	1
+#define NUM_ADCS	2
 
-volatile static unsigned char current_adc, current_slow_adc;
+volatile static unsigned char current_adc;
+volatile unsigned char adc_enabled;
+volatile unsigned char need_battery_adc, need_pwmled_adc;
 static uint16_t adc_sum, read_zero, drop_count, read_count, n_reads_log;
 volatile uint16_t jiffies;
 
@@ -21,6 +23,9 @@ static void setup_mux(unsigned char n)
 	case 0: // pwmled 1: 1.1V, ADC3 (PB3), single-ended
 		ADMUX = _BV(REFS1) | _BV(MUX1) | _BV(MUX0);
 		break;
+	case 1: // battery voltage: 1.1V, ADC1 (PB2), single-ended
+		ADMUX = _BV(REFS1) | _BV(MUX0);
+		break;
 	case ZERO_ADC: // zero: 1.1V, GND, single-ended
 		ADMUX = _BV(REFS1) | _BV(MUX3) | _BV(MUX2) | _BV(MUX0);
 		break;
@@ -29,37 +34,33 @@ static void setup_mux(unsigned char n)
 
 void start_next_adc()
 {
-#if 0
-	if (current_adc == 0) {
-		if (current_slow_adc > N_PWMLEDS) {
-			// read one of the non-PWMLED ADCs
-			current_adc = --current_slow_adc;
-		} else {
-			// no more non-PWMLEDs to do, start with PWMLEDs
-			current_adc = N_PWMLEDS-1;
-		}
-	} else if (current_adc >= N_PWMLEDS) {
-		// one of the non-PWMLED ADCs just finished, skip to PWMLEDs.
-		current_adc = N_PWMLEDS-1;
+	if (need_battery_adc) {
+		need_battery_adc = 0;
+		current_adc = 1;
+		read_zero = 1;
+		drop_count = 1;
+		read_count = 1;
+		n_reads_log = 0;
+	} else if (need_pwmled_adc) {
+		current_adc = 0;
+		read_zero = 0;
+		drop_count = 1;
+		read_count = 1 << PWMLED_ADC_SHIFT;
+		n_reads_log = PWMLED_ADC_SHIFT;
 	} else {
-		// next PWMLED
-		current_adc--;
+		ADCSRA &= ~_BV(ADEN);
+		power_adc_disable();
+		adc_enabled = 0;
+		return;
 	}
-#else
-	// single ADC for testing only
-	current_adc = 0;
-#endif
 
-#if 0
-	log_byte(0x90 + current_adc); // debug ADC switching
-#endif
+	if (!adc_enabled) {
+		power_adc_enable();
+		ADCSRA |= _BV(ADEN);
+		adc_enabled = 1;
+	}
 
 	adc_sum = 0;
-	read_zero = 0;
-	drop_count = 1;
-
-	read_count = 1 << PWMLED_ADC_SHIFT;
-	n_reads_log = PWMLED_ADC_SHIFT;
 
 	// set up mux, start one-shot conversion
 	if (read_zero)
@@ -104,8 +105,10 @@ static uint16_t read_adc_sync()
 
 void init_adc()
 {
-	current_slow_adc = NUM_ADCS;
+	need_battery_adc = 0;
+	need_pwmled_adc = 0;
 	current_adc = 0;
+	adc_enabled = 1;
 
 	power_adc_enable();
 	ACSR |= _BV(ACD);	// but disable the analog comparator
@@ -130,42 +133,17 @@ void init_adc()
 	start_next_adc();
 }
 
-#if 0
 void susp_adc()
 {
 	ADCSRA = 0;
 	DIDR0 = 0;
-}
-
-static void adc1_gain20_adc(uint16_t adcsum)
-{
-	// running average
-	adc1_gain20_offset += adcsum
-			- (adc1_gain20_offset >> ADC1_GAIN20_OFFSET_SHIFT);
-}
-#endif
-
-static void inline adc_based_timer()
-{
-	static unsigned char count;
-
-	if (++count < 40) // about 100 Hz jiffies
-		return;
-
-	count = 0;
-	++jiffies;
-
-	if ((jiffies & 0x0007) == 0) {
-		patterns_next_tick();
-	}
-	timer_check_buttons();
+	power_adc_disable();
+	adc_enabled = 0;
 }
 
 ISR(ADC_vect) { // IRQ handler
 	uint16_t adcval = ADCW;
 
-	adc_based_timer();
-
 	if (read_zero) {
 		setup_mux(current_adc);
 		read_zero = 0;
@@ -195,6 +173,9 @@ ISR(ADC_vect) { // IRQ handler
 		// pwmled_adc(current_adc, adc_sum);
 		pwmled_adc(adc_sum);
 		break;
+	case 1:
+		battery_adc(adc_sum);
+		break;
 	}
 
 	start_next_adc();