STM32 : Clock source selection in json config file

targets/TARGET_STM/TARGET_STM32F4/TARGET_MTS_DRAGONFLY_F411RE/device/system_clock.c

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+/* mbed Microcontroller Library
+* Copyright (c) 2006-2017 ARM Limited
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/**
+  * This file configures the system clock as follows:
+  *-----------------------------------------------------------------------------
+  * System clock source                | 1- PLL_HSE_EXTC        | 3- PLL_HSI
+  *                                    | (external 8 MHz clock) | (internal 16 MHz)
+  *                                    | 2- PLL_HSE_XTAL        |
+  *                                    | (external 8 MHz xtal)  |
+  *-----------------------------------------------------------------------------
+  * SYSCLK(MHz)                        | 100                    | 100
+  *-----------------------------------------------------------------------------
+  * AHBCLK (MHz)                       | 100                    | 100
+  *-----------------------------------------------------------------------------
+  * APB1CLK (MHz)                      | 50                     | 50
+  *-----------------------------------------------------------------------------
+  * APB2CLK (MHz)                      | 100                    | 100
+  *-----------------------------------------------------------------------------
+  * USB capable (48 MHz precise clock) | NO                     | NO
+  *-----------------------------------------------------------------------------
+**/
+
+#include "stm32f4xx.h"
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#ifndef VECT_TAB_OFFSET
+#define VECT_TAB_OFFSET  0x00 /*!< Vector Table base offset field.
+                                   This value must be a multiple of 0x200. */
+#endif
+
+
+/* Select the clock sources (other than HSI) to start with (0=OFF, 1=ON) */
+#define USE_PLL_HSE_EXTC (0) /* Use external clock */
+#define USE_PLL_HSE_XTAL (1) /* Use external xtal */
+
+#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0)
+uint8_t SetSysClock_PLL_HSE(uint8_t bypass);
+#endif
+
+uint8_t SetSysClock_PLL_HSI(void);
+
+/**
+  * @brief  Setup the microcontroller system
+  *         Initialize the FPU setting, vector table location and External memory
+  *         configuration.
+  * @param  None
+  * @retval None
+  */
+void SystemInit(void)
+{
+    /* FPU settings ------------------------------------------------------------*/
+#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
+    SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2));  /* set CP10 and CP11 Full Access */
+#endif
+    /* Reset the RCC clock configuration to the default reset state ------------*/
+    /* Set HSION bit */
+    RCC->CR |= (uint32_t)0x00000001;
+
+    /* Reset CFGR register */
+    RCC->CFGR = 0x00000000;
+
+    /* Reset HSEON, CSSON and PLLON bits */
+    RCC->CR &= (uint32_t)0xFEF6FFFF;
+
+    /* Reset PLLCFGR register */
+    RCC->PLLCFGR = 0x24003010;
+
+    /* Reset HSEBYP bit */
+    RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+    /* Disable all interrupts */
+    RCC->CIR = 0x00000000;
+
+#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+    SystemInit_ExtMemCtl();
+#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
+
+    /* Configure the Vector Table location add offset address ------------------*/
+#ifdef VECT_TAB_SRAM
+    SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+#else
+    SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
+#endif
+
+}
+
+/**
+  * @brief  Configures the System clock source, PLL Multiplier and Divider factors,
+  *               AHB/APBx prescalers and Flash settings
+  * @note   This function should be called only once the RCC clock configuration
+  *         is reset to the default reset state (done in SystemInit() function).
+  * @param  None
+  * @retval None
+  */
+void SetSysClock(void)
+{
+    /* 1- Try to start with HSE and external clock */
+#if USE_PLL_HSE_EXTC != 0
+    if (SetSysClock_PLL_HSE(1) == 0)
+#endif
+    {
+        /* 2- If fail try to start with HSE and external xtal */
+#if USE_PLL_HSE_XTAL != 0
+        if (SetSysClock_PLL_HSE(0) == 0)
+#endif
+        {
+            /* 3- If fail start with HSI clock */
+            if (SetSysClock_PLL_HSI() == 0) {
+                while(1) {
+                    // [TODO] Put something here to tell the user that a problem occured...
+                }
+            }
+        }
+    }
+
+    /* Output clock on MCO2 pin(PC9) for debugging purpose */
+    //HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_4); // 100 MHz / 4 = 25 MHz
+}
+
+#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0)
+/******************************************************************************/
+/*            PLL (clocked by HSE) used as System clock source                */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
+{
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+       clocked below the maximum system frequency, to update the voltage scaling value
+       regarding system frequency refer to product datasheet. */
+    __HAL_RCC_PWR_CLK_ENABLE();
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+    /* Enable HSE oscillator and activate PLL with HSE as source */
+    RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSE;
+    if (bypass == 0) {
+        RCC_OscInitStruct.HSEState          = RCC_HSE_ON; /* External 8 MHz xtal on OSC_IN/OSC_OUT */
+    } else {
+        RCC_OscInitStruct.HSEState          = RCC_HSE_BYPASS; /* External 8 MHz clock on OSC_IN */
+    }
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSE;
+    //RCC_OscInitStruct.PLL.PLLM          = 8;             // VCO input clock = 1 MHz (8 MHz / 8)
+    //RCC_OscInitStruct.PLL.PLLN          = 400;           // VCO output clock = 400 MHz (1 MHz * 400)
+    RCC_OscInitStruct.PLL.PLLM            = 13;             // VCO input clock = 2 MHz (8 MHz / 4)
+    RCC_OscInitStruct.PLL.PLLN            = 192;           // VCO output clock = 400 MHz (2 MHz * 200)
+    RCC_OscInitStruct.PLL.PLLP            = RCC_PLLP_DIV4; // PLLCLK = 100 MHz (400 MHz / 4)
+    RCC_OscInitStruct.PLL.PLLQ            = 8;             // USB clock = 44.44 MHz (400 MHz / 9) --> Not good for USB
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+    RCC_ClkInitStruct.ClockType      = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource   = RCC_SYSCLKSOURCE_PLLCLK; // 100 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 100 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;           //  50 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;           // 100 MHz
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    /* Output clock on MCO1 pin(PA8) for debugging purpose */
+
+    //if (bypass == 0)
+    //  HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_2); // 4 MHz with xtal
+    //else
+    //  HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_1); // 8 MHz with external clock
+
+    return 1; // OK
+}
+#endif
+
+/******************************************************************************/
+/*            PLL (clocked by HSI) used as System clock source                */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSI(void)
+{
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+
+    /* The voltage scaling allows optimizing the power consumption when the device is
+       clocked below the maximum system frequency, to update the voltage scaling value
+       regarding system frequency refer to product datasheet. */
+    __HAL_RCC_PWR_CLK_ENABLE();
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
+
+    /* Enable HSI oscillator and activate PLL with HSI as source */
+    RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSE;
+    RCC_OscInitStruct.HSIState            = RCC_HSI_ON;
+    RCC_OscInitStruct.HSEState            = RCC_HSE_OFF;
+    RCC_OscInitStruct.HSICalibrationValue = 16;
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSI;
+    //RCC_OscInitStruct.PLL.PLLM          = 16;            // VCO input clock = 1 MHz (16 MHz / 16)
+    //RCC_OscInitStruct.PLL.PLLN          = 400;           // VCO output clock = 400 MHz (1 MHz * 400)
+    RCC_OscInitStruct.PLL.PLLM            = 8;             // VCO input clock = 2 MHz (16 MHz / 8)
+    RCC_OscInitStruct.PLL.PLLN            = 200;           // VCO output clock = 400 MHz (2 MHz * 200)
+    RCC_OscInitStruct.PLL.PLLP            = RCC_PLLP_DIV4; // PLLCLK = 100 MHz (400 MHz / 4)
+    RCC_OscInitStruct.PLL.PLLQ            = 9;             // USB clock = 44.44 MHz (400 MHz / 9) --> Not good for USB
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
+    RCC_ClkInitStruct.ClockType      = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+    RCC_ClkInitStruct.SYSCLKSource   = RCC_SYSCLKSOURCE_PLLCLK; // 100 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 100 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;           //  50 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;           // 100 MHz
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    /* Output clock on MCO1 pin(PA8) for debugging purpose */
+    //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI, RCC_MCODIV_1); // 16 MHz
+
+    return 1; // OK
+}
+
+/******************************************************************************/
+/*            Hard Fault Handler                                              */
+/******************************************************************************/
+void HardFault_Handler(void)
+{
+    printf("Hard Fault\n");
+    NVIC_SystemReset();
+}