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=5ebc0a6d0d6076d224c594441773298ff48d6939;hp=9ed80f2d216b069412a2a12a53444c048d8a57eb;hb=b34429defa04d493a49e24ad8840e42600bd0f28;hpb=d52307e8b0b0b1113ba928e19ffa91340d037eda

diff --git a/firmware/adc.c b/firmware/adc.c
index 9ed80f2..5ebc0a6 100644
--- a/firmware/adc.c
+++ b/firmware/adc.c
@@ -204,6 +204,18 @@ static void adc1_gain20_adc(uint16_t adcsum)
 ISR(ADC_vect) { // IRQ handler
 	uint16_t adcval = ADCW;
 
+	/*
+	 * After the timer interrupt, drop the current reading.
+	 * We may have changed the PWM outputs, so the value is
+	 * probably useless anyway.
+	 * FIXME: possible race condition - we should make an explicit
+	 * notification inside the timer IRQ handler.
+	 */
+	if (slow_adcs_wanted) {
+		start_next_adc();
+		return;
+	}
+
 	if (zero_count) {
 		if (zero_count > 1) {
 			ADCSRA |= _BV(ADSC);