diff --git a/firmware/libboard/common/include/boardver_adc.h b/firmware/libboard/common/include/boardver_adc.h
index a89d630b..7a8d226d 100644
--- a/firmware/libboard/common/include/boardver_adc.h
+++ b/firmware/libboard/common/include/boardver_adc.h
@@ -1,3 +1,4 @@
 #pragma once
 
+uint32_t adc2uv(uint16_t adc);
 int get_board_version_adc(void);
diff --git a/firmware/libboard/common/source/boardver_adc.c b/firmware/libboard/common/source/boardver_adc.c
index 1bd3b58b..54ab75e0 100644
--- a/firmware/libboard/common/source/boardver_adc.c
+++ b/firmware/libboard/common/source/boardver_adc.c
@@ -1,6 +1,13 @@
 #include "board.h"
 #include "boardver_adc.h"
 
+#define UV_PER_LSB     ((3300 * 1000) / 4096)
+uint32_t adc2uv(uint16_t adc)
+{
+	uint32_t uv = (uint32_t) adc * UV_PER_LSB;
+	return uv;
+}
+
 /***********************************************************************
  * ADC for board version detection
  ***********************************************************************/
diff --git a/firmware/libcommon/source/mode_cardemu.c b/firmware/libcommon/source/mode_cardemu.c
index 7de67dfc..7e38527c 100644
--- a/firmware/libcommon/source/mode_cardemu.c
+++ b/firmware/libcommon/source/mode_cardemu.c
@@ -1,6 +1,7 @@
 //#define TRACE_LEVEL 6
 
 #include "board.h"
+#include "boardver_adc.h"
 #include "simtrace.h"
 #include "ringbuffer.h"
 #include "card_emu.h"
@@ -278,7 +279,6 @@ static int card_vcc_adc_init(void)
 	return 0;
 }
 
-#define UV_PER_LSB	((3300 * 1000) / 4096)
 #define VCC_UV_THRESH_1V8	1500000
 #define VCC_UV_THRESH_3V	2800000
 
@@ -298,12 +298,6 @@ static void process_vcc_adc(struct cardem_inst *ci)
 	ci->vcc_uv_last = ci->vcc_uv;
 }
 
-static uint32_t adc2uv(uint16_t adc)
-{
-	uint32_t uv = (uint32_t) adc * UV_PER_LSB;
-	return uv;
-}
-
 void ADC_IrqHandler(void)
 {
 #ifdef CARDEMU_SECOND_UART