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-rw-r--r--src/avr/gpio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/avr/gpio.c b/src/avr/gpio.c
index 5dfc34c4..aa39f957 100644
--- a/src/avr/gpio.c
+++ b/src/avr/gpio.c
@@ -258,7 +258,7 @@ static const uint8_t adc_pins[] PROGMEM = {
static const uint8_t ADMUX_DEFAULT = 0x40;
-DECL_CONSTANT(ADC_MAX, 1024);
+DECL_CONSTANT(ADC_MAX, 1023);
struct gpio_adc
gpio_adc_setup(uint8_t pin)