diff --git a/firmware/analog_input.cpp b/firmware/analog_input.cpp
index cb2b2fa..77e1e22 100644
--- a/firmware/analog_input.cpp
+++ b/firmware/analog_input.cpp
@@ -2,14 +2,18 @@
 
 #include "hal.h"
 
+#define ADC_CHANNEL_COUNT 3
 #define ADC_OVERSAMPLE 8
 
-static adcsample_t adcBuffer[3 * ADC_OVERSAMPLE];
+static adcsample_t adcBuffer[ADC_CHANNEL_COUNT * ADC_OVERSAMPLE];
 
 ADCConversionGroup convGroup =
 {
-    false, 3, nullptr, nullptr,
-    0,                  // CFGR1
+    false,
+    ADC_CHANNEL_COUNT,
+    nullptr,
+    nullptr,
+    ADC_CFGR1_CONT | ADC_CFGR1_RES_12BIT,                  // CFGR1
     ADC_TR(0, 0),       // TR
     ADC_SMPR_SMP_28P5,      // SMPR
     ADC_CHSELR_CHSEL0 | ADC_CHSELR_CHSEL1 | ADC_CHSELR_CHSEL2