Enable USB clock for Nucleo L053R8

Fix #1181

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

variants/NUCLEO_L053R8/variant.cpp

@@ -116,35 +116,44 @@ extern "C" {
   */
 WEAK void SystemClock_Config(void)
 {
-  RCC_OscInitTypeDef RCC_OscInitStruct;
-  RCC_ClkInitTypeDef RCC_ClkInitStruct;
-  RCC_PeriphCLKInitTypeDef PeriphClkInit;
-
-  __HAL_RCC_PWR_CLK_ENABLE();
+  RCC_OscInitTypeDef RCC_OscInitStruct = {};
+  RCC_ClkInitTypeDef RCC_ClkInitStruct = {};
 
+  /* Configure the main internal regulator output voltage */
   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
-  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-  RCC_OscInitStruct.HSICalibrationValue = 16;
+  /*
+   * 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;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
-  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;
-  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;
-  HAL_RCC_OscConfig(&RCC_OscInitStruct);
-
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_12;
+  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_3;
+  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+    Error_Handler();
+  }
+  /* Initializes the CPU, AHB and APB buses clocks */
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                 | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
-  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1);
 
-  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2 | RCC_PERIPHCLK_I2C1;
-  PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
-  PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;
-  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
+  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
+    Error_Handler();
+  }
+
+#ifdef USBCON
+  RCC_PeriphCLKInitTypeDef PeriphClkInit = {};
+  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
+  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL;
+  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
+    Error_Handler();
+  }
+#endif
 }
 
 #ifdef __cplusplus