mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F429xI/TARGET_NUCLEO_F429ZI/system_clock.c
- Committer:
- AnnaBridge
- Date:
- 2019-02-20
- Revision:
- 189:f392fc9709a3
- Parent:
- 187:0387e8f68319
File content as of revision 189:f392fc9709a3:
/* 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- USE_PLL_HSE_EXTC (external 8 MHz clock) | * | 2- USE_PLL_HSE_XTAL (external 8 MHz xtal) | CLOCK_SOURCE_USB=1 * | 3- USE_PLL_HSI (internal 16 MHz clock) | *----------------------------------------------------------------------------------- * SYSCLK(MHz) | 180 | 168 * AHBCLK (MHz) | 180 | 168 * APB1CLK (MHz) | 45 | 42 * APB2CLK (MHz) | 90 | 84 * USB capable (48 MHz) | NO | YES (HSI calibration needed) *----------------------------------------------------------------------------------- **/ #include "stm32f4xx.h" #include "nvic_addr.h" #include "mbed_error.h" // clock source is selected with CLOCK_SOURCE in json config #define USE_PLL_HSE_EXTC 0x8 // Use external clock (ST Link MCO) #define USE_PLL_HSE_XTAL 0x4 // Use external xtal (X3 on board - not provided by default) #define USE_PLL_HSI 0x2 // Use HSI internal clock #if ( ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) ) uint8_t SetSysClock_PLL_HSE(uint8_t bypass); #endif /* ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) */ #if ((CLOCK_SOURCE) & USE_PLL_HSI) uint8_t SetSysClock_PLL_HSI(void); #endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */ /** * @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 = NVIC_FLASH_VECTOR_ADDRESS; /* 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) { #if ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) /* 1- Try to start with HSE and external clock */ if (SetSysClock_PLL_HSE(1) == 0) #endif { #if ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) /* 2- If fail try to start with HSE and external xtal */ if (SetSysClock_PLL_HSE(0) == 0) #endif { #if ((CLOCK_SOURCE) & USE_PLL_HSI) /* 3- If fail start with HSI clock */ if (SetSysClock_PLL_HSI() == 0) #endif { { error("SetSysClock failed\n"); } } } } } #if ( ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) ) /******************************************************************************/ /* PLL (clocked by HSE) used as System clock source */ /******************************************************************************/ uint8_t SetSysClock_PLL_HSE(uint8_t bypass) { RCC_OscInitTypeDef RCC_OscInitStruct; RCC_ClkInitTypeDef RCC_ClkInitStruct; /* 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_SCALE1); // 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; #if (CLOCK_SOURCE_USB) RCC_OscInitStruct.PLL.PLLN = 336; #else RCC_OscInitStruct.PLL.PLLN = 360; #endif RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; // 180 MHz or 168 MHz if CLOCK_SOURCE_USB defined RCC_OscInitStruct.PLL.PLLQ = 7; // 48 MHz if CLOCK_SOURCE_USB defined if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { return 0; // FAIL } // Activate the OverDrive to reach the 180 MHz Frequency if (HAL_PWREx_EnableOverDrive() != 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; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 180 or 168 MHz RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // 45 or 42 MHz RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // 90 or 84 MHz if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { return 0; // FAIL } // HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_3); return 1; } #endif /* ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) */ #if ((CLOCK_SOURCE) & USE_PLL_HSI) /******************************************************************************/ /* PLL (clocked by HSI) used as System clock source */ /******************************************************************************/ uint8_t SetSysClock_PLL_HSI(void) { RCC_OscInitTypeDef RCC_OscInitStruct; RCC_ClkInitTypeDef RCC_ClkInitStruct; /* 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_SCALE1); // 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; RCC_OscInitStruct.PLL.PLLM = 8; #if (CLOCK_SOURCE_USB) RCC_OscInitStruct.PLL.PLLN = 168; #else RCC_OscInitStruct.PLL.PLLN = 180; #endif RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; // 180 MHz or 168 MHz if CLOCK_SOURCE_USB defined RCC_OscInitStruct.PLL.PLLQ = 7; // 48 MHz if CLOCK_SOURCE_USB defined if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { return 0; // FAIL } // Activate the OverDrive to reach the 180 MHz Frequency if (HAL_PWREx_EnableOverDrive() != 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; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 180 or 168 MHz RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // 45 or 42 MHz RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // 90 or 84 MHz if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { return 0; // FAIL } // HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_3); return 1; } #endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */