diff --git a/syslib.c b/syslib.c
--- a/syslib.c
+++ b/syslib.c
@@ -69,10 +69,14 @@ void systemclock_config(void)
   RCC_ClkInitTypeDef RCC_ClkInitStruct;
   RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
+  // Enable HSI48 for main system clock
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSI14;
   RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
+  RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
+  RCC_OscInitStruct.HSI14CalibrationValue = 16;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
   HAL_RCC_OscConfig(&RCC_OscInitStruct);
+ 
 
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI48;