fix: variant Nucleo F031K6: switch PLL source to HSI

On Nucleo F031K6, the HSE bypass through MCO from STLink
is not configured by default
(It would need SolderBridge configuration)
Thus use HSI by default.

Signed-off-by: Alexandre Bourdiol <[email protected]>

Author: ABOSTM

Diff for: variants/STM32F0xx/F031K6T/variant_NUCLEO_F031K6.cpp

@@ -70,20 +70,23 @@ WEAK void SystemClock_Config(void)
   RCC_OscInitTypeDef RCC_OscInitStruct = {};
   RCC_ClkInitTypeDef RCC_ClkInitStruct = {};
 
-  /*
-   * Initializes the RCC Oscillators according to the specified parameters
-   * in the RCC_OscInitTypeDef structure.
-   */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
+  /** Initializes the RCC Oscillators according to the specified parameters
+  * in the RCC_OscInitTypeDef structure.
+  * No HSE Oscillator on Nucleo by default (solderbridge not configured)
+  */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
   RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
     Error_Handler();
   }
-  /* Initializes the CPU, AHB and APB buses clocks */
+
+  /** Initializes the CPU, AHB and APB buses clocks
+  */
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                 | RCC_CLOCKTYPE_PCLK1;
   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;