diff --git a/lib/vfd.c b/lib/vfd.c
index d44275d..e6ddf95 100644
--- a/lib/vfd.c
+++ b/lib/vfd.c
@@ -399,8 +399,7 @@ void vfd_matrix(uint8_t nb, char c)
 	}
 }
 
-/* clear VFD display
- * the data has to be transmitted separately */
+/* clear VFD display */
 void vfd_clear(void)
 {
 	for (uint8_t i=0; i<LENGTH(driver_data); i++) {
@@ -410,8 +409,7 @@ void vfd_clear(void)
 	}
 }
 
-/* test VFD display (light up all anodes)
- * the data has to be transmitted separately */
+/* test VFD display (light up all anodes) */
 void vfd_test(void)
 {
 	for (uint8_t i=0; i<LENGTH(driver_data); i++) {
@@ -425,23 +423,13 @@ void vfd_test(void)
 void vfd_on(void)
 {
 	gpio_clear(VFD_PORT, VFD_STR); // enable HV output
+	timer_enable_counter(VFD_TIMER); // start timer to periodically output that to the parts
 }
 
 /* switch VFD display off */
 void vfd_off(void)
 {
 	gpio_set(VFD_PORT, VFD_STR); // disable HV output
-}
-
-/* output data on the parts */
-void vfd_refresh_on(void)
-{
-	timer_enable_counter(VFD_TIMER); // start timer to periodically output that to the parts
-}
-
-/* stop outputting data on the parts*/
-void vfd_refresh_off(void)
-{
 	timer_disable_counter(VFD_TIMER); // stop timer to periodically output that to the parts
 }
 
diff --git a/lib/vfd.h b/lib/vfd.h
index 3036e64..a52a79e 100644
--- a/lib/vfd.h
+++ b/lib/vfd.h
@@ -21,29 +21,19 @@
 #define VFD_DIGITS 10
 #define VFD_MATRIX 12
 
-/* all digits and matrix values */
-extern char vfd_digits[VFD_DIGITS];
-extern char vfd_matrixs[VFD_MATRIX];
-
 /* set digit <nb> to ASCII character <c>
  * use the MSB of <c> to enable the dot */
 void vfd_digit(uint8_t nb, char c);
 /* set dot matrix <nb> to ASCII character <c>
  * non ASCII characters are used for pictures */
 void vfd_matrix(uint8_t nb, char c);
-/* clear VFD display
- * the data has to be transmitted separately */
+/* clear VFD display */
 void vfd_clear(void);
-/* test VFD display (light up all anodes)
- * the data has to be transmitted separately */
+/* test VFD display (light up all anodes) */
 void vfd_test(void);
 /* transmit every digit and matrix */
 void vfd_on(void);
 /* switch VFD display off */
 void vfd_off(void);
-/* output data on the parts */
-void vfd_refresh_on(void);
-/* stop outputing data on the parts*/
-void vfd_refresh_off(void);
 /* setup VFD */
 void vfd_setup(void);
diff --git a/main.c b/main.c
index 7f6c791..c944810 100644
--- a/main.c
+++ b/main.c
@@ -79,19 +79,17 @@ int main(void)
 
 
 	vfd_on(); // switch on VFD
-	vfd_refresh_on();
-	vfd_test();
-	for (uint32_t i = 0; i < 0x800000; i++) {
+	vfd_test(); // show all anodes
+	for (uint32_t i = 0; i < 0x800000; i++) { // show for a bit of time
 		__asm__("nop");
 	}
-	vfd_clear();
+	vfd_clear(); // clear all data
 
 	bool vfd_flag = false;
-	bool refresh = true;
-	for (uint8_t i=0; i<LENGTH(vfd_digits); i++) {
+	for (uint8_t i=0; i<VFD_DIGITS; i++) {
 		vfd_digit(i,'0'+i);
 	}
-	for (uint8_t i=0; i<LENGTH(vfd_matrixs); i++) {
+	for (uint8_t i=0; i<VFD_MATRIX; i++) {
 		vfd_matrix(i,'A'+i);
 	}
 	while (true) {
@@ -106,14 +104,6 @@ int main(void)
 		while (vfd_flag) {
 			vfd_flag = false;
 			gpio_toggle(LED_PORT, LED_PIN); // toggle LED
-			if (refresh) {
-				printf("on\n");
-				vfd_refresh_on();
-			} else {
-				printf("off\n");
-				vfd_refresh_off();
-			}
-			refresh = !refresh;
 		}
 		__WFI(); // go to sleep
 	}