Nucleo F103RB has no HSE by default, use HSI

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

Author: fpistm

variants/NUCLEO_F103RB/variant.cpp

@@ -105,14 +105,14 @@ extern "C" {
 /**
   * @brief  System Clock Configuration
   *         The system Clock is configured as follow :
-  *            System Clock source            = PLL (HSE)
-  *            SYSCLK(Hz)                     = 72000000
-  *            HCLK(Hz)                       = 72000000
+  *            System Clock source            = PLL (HSI)
+  *            SYSCLK(Hz)                     = 64000000
+  *            HCLK(Hz)                       = 64000000
   *            AHB Prescaler                  = 1
   *            APB1 Prescaler                 = 2
   *            APB2 Prescaler                 = 1
-  *            PLL_Source                     = HSE
-  *            PLL_Mul                        = 9
+  *            PLL_Source                     = HSI
+  *            PLL_Mul                        = 16
   *            Flash Latency(WS)              = 2
   *            ADC Prescaler                  = 6
   * @param  None
@@ -124,37 +124,42 @@ WEAK void SystemClock_Config(void)
   RCC_ClkInitTypeDef RCC_ClkInitStruct;
   RCC_PeriphCLKInitTypeDef PeriphClkInit;
 
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
-  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
-  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
+  /* Initializes the CPU, AHB and APB busses clocks */
+  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+  RCC_OscInitStruct.HSICalibrationValue = 16;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
-  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
+  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
+  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
+  /* Initializes the CPU, AHB and APB busses 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_DIV2;
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+
   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
   PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
   {
-    while(1);
+    Error_Handler();
   }
 
+  /* Configure the Systick interrupt time */
   HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);
 
+  /* Configure the Systick */
   HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
 
   /* SysTick_IRQn interrupt configuration */