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-rw-r--r--sw/main.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/sw/main.cpp b/sw/main.cpp
index 94a444a..c9ecd04 100644
--- a/sw/main.cpp
+++ b/sw/main.cpp
@@ -109,7 +109,7 @@ const uint32_t V_REF_mV = 5000;
#define ADC_VALUE_TO_MILLIVOLT(val) ((uint32_t)val * V_REF_mV) / (uint32_t)(1<<10)
// Use the LDO on Vref as ADC reference, set REFS1..REFS0 = 0b00, and ADC input 0
-#define SET_ADMUX(input) ADMUX = _BV(REFS0) | _BV(REFS1) | input
+#define SET_ADMUX(input) ADMUX = (input & 0x0F)
/* Timer at approximately 100ms.
*