diff --git a/firmware/libboard/common/include/boardver_adc.h b/firmware/libboard/common/include/boardver_adc.h
index 9b01d0a5..956c3027 100644
--- a/firmware/libboard/common/include/boardver_adc.h
+++ b/firmware/libboard/common/include/boardver_adc.h
@@ -15,3 +15,4 @@
 #pragma once
 
 int get_board_version_adc(void);
+uint32_t adc2uv(uint16_t adc);
diff --git a/firmware/libboard/common/source/boardver_adc.c b/firmware/libboard/common/source/boardver_adc.c
index f204aa15..51db9292 100644
--- a/firmware/libboard/common/source/boardver_adc.c
+++ b/firmware/libboard/common/source/boardver_adc.c
@@ -15,9 +15,8 @@
 #include "board.h"
 #include "boardver_adc.h"
 
-/* FIXME: share this with mode_cardemu.c */
 #define UV_PER_LSB	((3300 * 1000) / 4096)
-static uint32_t adc2uv(uint16_t adc)
+uint32_t adc2uv(uint16_t adc)
 {
 	uint32_t uv = (uint32_t) adc * UV_PER_LSB;
 	return uv;
diff --git a/firmware/libcommon/source/mode_cardemu.c b/firmware/libcommon/source/mode_cardemu.c
index c7362cf7..b1d9c7a8 100644
--- a/firmware/libcommon/source/mode_cardemu.c
+++ b/firmware/libcommon/source/mode_cardemu.c
@@ -17,6 +17,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA
  */
 #include "board.h"
+#include "boardver_adc.h"
 #include "simtrace.h"
 #include "ringbuffer.h"
 #include "card_emu.h"
@@ -296,7 +297,6 @@ 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
 
@@ -316,12 +316,6 @@ 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