From 8bfaabcf276404625b89fae3a591f7838b79886c Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Mon, 23 Jun 2025 19:27:53 +0200
Subject: [PATCH] read 10bit brightness (instead of 8 bit).

---
 avr/modules/brightness/main.asm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/avr/modules/brightness/main.asm b/avr/modules/brightness/main.asm
index 49d9e11..a3326b2 100644
--- a/avr/modules/brightness/main.asm
+++ b/avr/modules/brightness/main.asm
@@ -56,7 +56,7 @@ Brightness_Init:
 
   ldi r16, BRIGHTNESS_ADC_MUX                                ; select input pin, use Vcc as reference voltage
   out ADMUX, r16
-  ldi r16, (1 << ADLAR)
+  ldi r16, (0 << ADLAR)
   out ADCSRB, r16
   ldi r16, (1 << ADEN) | (1 << ADPS1) | (1 << ADPS0)         ; enable, prescaler 8
   out ADCSRA, r16
@@ -96,7 +96,12 @@ Brightness_Every100ms_readValue:
   ; conversion complete, read value
   ldi r16, BRIGHTNESS_INTERVAL                 ; restart timer
   sts brightnessTimer, r16
-  in r16, ADCH                                 ; read value from ADC
+  in r16, ADCL
+  in r17, ADCH                                 ; read value from ADC
+  tst r17
+  breq Brightness_Every100ms_storeValue
+  ldi r16, 0xff
+Brightness_Every100ms_storeValue:
   sts brightnessLastValue, r16
   ; convert to 1/0
   lds r17, brightnessFlags