diff --git a/src/io.c b/src/io.c
index 38404c0..e873978 100644
--- a/src/io.c
+++ b/src/io.c
@@ -58,7 +58,7 @@ void io_ext_watchdog_config(void) {
 #ifdef STM32L471xx
 		GPIO_InitTypeDef.Mode = LL_GPIO_MODE_OUTPUT;
 		GPIO_InitTypeDef.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
-		GPIO_InitTypeDef.Pin = LL_GPIO_PIN_12;
+		GPIO_InitTypeDef.Pin = LL_GPIO_PIN_1;
 		GPIO_InitTypeDef.Pull = LL_GPIO_PULL_NO;
 		GPIO_InitTypeDef.Speed = LL_GPIO_SPEED_FREQ_MEDIUM;
 		GPIO_InitTypeDef.Alternate = LL_GPIO_AF_7;
@@ -72,7 +72,14 @@ void io_ext_watchdog_service(void) {
 #endif
 
 #ifdef STM32L471xx
-
+	if ((GPIOA->ODR & GPIO_ODR_OD1) == 0) {
+		// set high
+		GPIOA->BSRR |= GPIO_BSRR_BS1;
+	}
+	else {
+		// set low
+		GPIOA->BSRR |= GPIO_BSRR_BR1;
+	}
 #endif
 }
 
diff --git a/src/it_handlers.c b/src/it_handlers.c
index b0c9e9c..c5bfaeb 100644
--- a/src/it_handlers.c
+++ b/src/it_handlers.c
@@ -31,6 +31,7 @@
 #include "LedConfig.h"
 //#include "afsk.h"
 #include "diag/Trace.h"
+#include "io.h"
 
 #include "station_config.h"
 
@@ -183,6 +184,7 @@ void TIM7_IRQHandler(void) {
 	#define ASC2 adc_sample_c2
 	AdcBuffer[ASC] =  ADC1->DR;
 	if(ASC == 3) {
+//		io_ext_watchdog_service();
 		AdcValue = (short int)(( AdcBuffer[0] + AdcBuffer[1] + AdcBuffer[2] + AdcBuffer[3]) >> 1);
 		AFSK_ADC_ISR(&main_afsk, (AdcValue - 4095) );
 		led_control_led1_upper(main_ax25.dcd);
diff --git a/system/src/cmsis/stm32l4xx/system_stm32l4xx.c b/system/src/cmsis/stm32l4xx/system_stm32l4xx.c
index 11ecf52..ba1f30c 100644
--- a/system/src/cmsis/stm32l4xx/system_stm32l4xx.c
+++ b/system/src/cmsis/stm32l4xx/system_stm32l4xx.c
@@ -367,6 +367,9 @@ int SystemClock_Config_L4(void)
   // be sure that PLL is not running
   while ((RCC->CR & RCC_CR_PLLRDY) != 0);
 
+  // reset PLLCFGR register
+  RCC->PLLCFGR = 0;
+
   // set the clock source for PLL
   RCC->PLLCFGR |= RCC_PLLCFGR_PLLSRC_HSE;