[DISCO_L072CZ_LRWAN1] Enable USB clock

Fix #479

Signed-off-by: Frederic.Pillon <[email protected]>

Author: fpistm

variants/DISCO_L072CZ_LRWAN1/variant.cpp

@@ -88,21 +88,22 @@ WEAK void SystemClock_Config(void)
 
   RCC_OscInitTypeDef RCC_OscInitStruct;
   RCC_ClkInitTypeDef RCC_ClkInitStruct;
+  RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
   __HAL_RCC_PWR_CLK_ENABLE();
 
   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
 
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSI48;
   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-  RCC_OscInitStruct.HSICalibrationValue = 16;
+  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
   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;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
-    /* Initialization Error */
-    while (1);
+    Error_Handler();
   }
 
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
@@ -112,8 +113,12 @@ WEAK void SystemClock_Config(void)
   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
-    /* Initialization Error */
-    while (1);
+    Error_Handler();
+  }
+  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
+  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
+  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
+    Error_Handler();
   }
 
   HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / 1000);