Diff: TARGET_BLUEPILL/device/system_clock.c

Revision:

0:a04710facbb6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TARGET_BLUEPILL/device/system_clock.c	Thu May 14 05:25:26 2020 +0000
@@ -0,0 +1,232 @@
+/* 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 8 MHz)
+  *                                    | 2- PLL_HSE_XTAL        |
+  *                                    | (external 8 MHz xtal)  |
+  *-----------------------------------------------------------------------------
+  * SYSCLK(MHz)                        | 72                     | 64
+  *-----------------------------------------------------------------------------
+  * AHBCLK (MHz)                       | 72                     | 64
+  *-----------------------------------------------------------------------------
+  * APB1CLK (MHz)                      | 36                     | 32
+  *-----------------------------------------------------------------------------
+  * APB2CLK (MHz)                      | 72                     | 64
+  *-----------------------------------------------------------------------------
+  * USB capable (48 MHz precise clock) | NO                     | NO
+  *-----------------------------------------------------------------------------
+  ******************************************************************************
+  */
+
+#include "stm32f1xx.h"
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET  0x00000000U /*!< Vector Table base offset field. 
+                                  This value must be a multiple of 0x200. */
+
+
+/* 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 Embedded Flash Interface, the PLL and update the
+  *         SystemCoreClock variable.
+  * @note   This function should be used only after reset.
+  * @param  None
+  * @retval None
+  */
+void SystemInit (void)
+{
+    /* Reset the RCC clock configuration to the default reset state(for debug purpose) */
+    /* Set HSION bit */
+    RCC->CR |= 0x00000001U;
+
+    /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
+#if !defined(STM32F105xC) && !defined(STM32F107xC)
+    RCC->CFGR &= 0xF8FF0000U;
+#else
+    RCC->CFGR &= 0xF0FF0000U;
+#endif /* STM32F105xC */
+
+    /* Reset HSEON, CSSON and PLLON bits */
+    RCC->CR &= 0xFEF6FFFFU;
+
+    /* Reset HSEBYP bit */
+    RCC->CR &= 0xFFFBFFFFU;
+
+    /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
+    RCC->CFGR &= 0xFF80FFFFU;
+
+#if defined(STM32F105xC) || defined(STM32F107xC)
+    /* Reset PLL2ON and PLL3ON bits */
+    RCC->CR &= 0xEBFFFFFFU;
+
+    /* Disable all interrupts and clear pending bits  */
+    RCC->CIR = 0x00FF0000U;
+
+    /* Reset CFGR2 register */
+    RCC->CFGR2 = 0x00000000U;
+#elif defined(STM32F100xB) || defined(STM32F100xE)
+    /* Disable all interrupts and clear pending bits  */
+    RCC->CIR = 0x009F0000U;
+
+    /* Reset CFGR2 register */
+    RCC->CFGR2 = 0x00000000U;
+#else
+    /* Disable all interrupts and clear pending bits  */
+    RCC->CIR = 0x009F0000U;
+#endif /* STM32F105xC */
+
+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
+#ifdef DATA_IN_ExtSRAM
+    SystemInit_ExtMemCtl();
+#endif /* DATA_IN_ExtSRAM */
+#endif
+
+#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 MCO1 pin(PA8) for debugging purpose */
+    //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1); // 72 MHz or 64 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;
+
+    /* 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.HSEPredivValue      = RCC_HSE_PREDIV_DIV1;
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLMUL          = RCC_PLL_MUL9; // 72 MHz (8 MHz * 9)
+    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; // 72 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 72 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;           // 36 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;           // 72 MHz
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    /* Output clock on MCO1 pin(PA8) for debugging purpose */
+    //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_1); // 8 MHz
+
+    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;
+
+    /* 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 = RCC_HSICALIBRATION_DEFAULT;
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSI_DIV2;
+    RCC_OscInitStruct.PLL.PLLMUL          = RCC_PLL_MUL16; // 64 MHz (8 MHz/2 * 16)
+    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; // 64 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 64 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;           // 32 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;           // 64 MHz
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != 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); // 8 MHz
+
+    return 1; // OK
+}
+