Update NUCLEO-L476 clock config: enable HSI to allow uart as wakeup source in stop mode

Signed-off-by: fpr <[email protected]>

Author: fpr

variants/NUCLEO_L476RG/variant.cpp

@@ -103,19 +103,19 @@ extern "C" {
 /**
   * @brief  System Clock Configuration
   *         The system Clock is configured as follows :
-  *            System Clock source            = PLL (MSI)
+  *            System Clock source            = PLL (HSI)
   *            SYSCLK(Hz)                     = 80000000
   *            HCLK(Hz)                       = 80000000
   *            AHB Prescaler                  = 1
   *            APB1 Prescaler                 = 1
   *            APB2 Prescaler                 = 1
-  *            MSI Frequency(Hz)              = 4000000
+  *            HSI Frequency(Hz)              = 16000000
   *            PLL_M                          = 1
-  *            PLL_N                          = 40
+  *            PLL_N                          = 10
   *            PLL_R                          = 2
   *            PLL_P                          = 7
-  *            PLL_Q                          = 4
-  *            Flash Latency(WS)              = 4
+  *            PLL_Q                          = 2
+  *            Flash Latency(WS)              = 3
   * @param  None
   * @retval None
   */
@@ -124,20 +124,16 @@ WEAK void SystemClock_Config(void)
   RCC_OscInitTypeDef RCC_OscInitStruct = {};
   RCC_ClkInitTypeDef RCC_ClkInitStruct = {};
 
-  /* MSI is enabled after System reset, activate PLL with MSI as source */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
-  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
-
-  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
-  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
+  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_MSI;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
   RCC_OscInitStruct.PLL.PLLM = 1;
-  RCC_OscInitStruct.PLL.PLLN = 40;
+  RCC_OscInitStruct.PLL.PLLN = 10;
   RCC_OscInitStruct.PLL.PLLR = 2;
   RCC_OscInitStruct.PLL.PLLP = 7;
-  RCC_OscInitStruct.PLL.PLLQ = 4;
-
+  RCC_OscInitStruct.PLL.PLLQ = 2;
   if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
   {
     /* Initialization Error */
@@ -151,7 +147,7 @@ WEAK void SystemClock_Config(void)
   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
-  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
+  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
   {
     /* Initialization Error */
     while(1);