X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=projects%2Fstep-up%2Fadc.c;h=cff4527037c0bfe052a6304caeb9a422da9fd1c3;hb=655d773afa02e2589680fa9cefd4302efa2fd2b3;hp=d7679d30b09cff20d7038629cca4d334b8a04b06;hpb=d024b5fce4c9465b99e1f666bb7d3ca4c0706f08;p=tinyboard.git

diff --git a/projects/step-up/adc.c b/projects/step-up/adc.c
index d7679d3..cff4527 100644
--- a/projects/step-up/adc.c
+++ b/projects/step-up/adc.c
@@ -1,5 +1,6 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include <avr/power.h>
 #include <avr/sleep.h>
 
 #include "lights.h"
@@ -11,6 +12,7 @@
 
 volatile static unsigned char current_adc, current_slow_adc;
 static uint16_t adc_sum, read_zero, drop_count, read_count, n_reads_log;
+volatile uint16_t jiffies;
 
 static void setup_mux(unsigned char n)
 {
@@ -105,6 +107,9 @@ void init_adc()
 	current_slow_adc = NUM_ADCS;
 	current_adc = 0;
 
+	power_adc_enable();
+	ACSR |= _BV(ACD);	// but disable the analog comparator
+
 	ADCSRA = _BV(ADEN)			// enable
 		| _BV(ADPS1) | _BV(ADPS0)	// CLK/8 = 125 kHz
 		// | _BV(ADPS2)			// CLK/16 = 62.5 kHz
@@ -140,9 +145,26 @@ static void adc1_gain20_adc(uint16_t adcsum)
 }
 #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();
+	}
+}
+
 ISR(ADC_vect) { // IRQ handler
 	uint16_t adcval = ADCW;
 
+	adc_based_timer();
+
 	if (read_zero) {
 		setup_mux(current_adc);
 		read_zero = 0;