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Diff: targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F446xE/TARGET_NUCLEO_F446RE/system_clock.c
- Revision:
- 0:13413ea9a877
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F446xE/TARGET_NUCLEO_F446RE/system_clock.c Sun Jun 12 14:02:44 2022 +0000 @@ -0,0 +1,282 @@ +/* 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 | 3- USE_PLL_HSI + * | (external 8 MHz clock) | (internal 16 MHz) + * | 2- USE_PLL_HSE_XTAL | + * | (external 8 MHz xtal) | + *----------------------------------------------------------------------------- + * SYSCLK(MHz) | 180 | 180 + *----------------------------------------------------------------------------- + * AHBCLK (MHz) | 180 | 180 + *----------------------------------------------------------------------------- + * APB1CLK (MHz) | 45 | 45 + *----------------------------------------------------------------------------- + * APB2CLK (MHz) | 90 | 90 + *----------------------------------------------------------------------------- + * USB capable (48 MHz precise clock) | YES | YES (HSI calibration needed) + *----------------------------------------------------------------------------- +**/ + +#include "stm32f4xx.h" +#include "mbed_assert.h" + +/*!< Uncomment the following line if you need to relocate your vector Table in + Internal SRAM. */ +/* #define VECT_TAB_SRAM */ +#define VECT_TAB_OFFSET 0x00 /*!< Vector Table base offset field. + This value must be a multiple of 0x200. */ + + +// 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 + +//#define DEBUG_MCO (1) // Output the MCO1/MCO2 on PA8/PC9 for debugging (0=OFF, 1=ON) + + +#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 = 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) +{ +#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 + { + while(1) { + MBED_ASSERT(1); + } + } + } + } + + // Output clock on MCO2 pin(PC9) for debugging purpose +#if DEBUG_MCO == 1 + HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_4); +#endif +} + +#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; + RCC_PeriphCLKInitTypeDef PeriphClkInitStruct; + + /* 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; // VCO input clock = 1 MHz (8 MHz / 8) + RCC_OscInitStruct.PLL.PLLN = 360; // VCO output clock = 360 MHz (1 MHz * 360) + RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; // PLLCLK = 180 MHz (360 MHz / 2) + RCC_OscInitStruct.PLL.PLLQ = 7; // + RCC_OscInitStruct.PLL.PLLR = 2; // + 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 PLLSAI output as USB clock source + PeriphClkInitStruct.PLLSAI.PLLSAIM = 8; + PeriphClkInitStruct.PLLSAI.PLLSAIN = 384; + PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV8; + PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CLK48; + PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48CLKSOURCE_PLLSAIP; + HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct); + + // 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 MHz + RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // 45 MHz + RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // 90 MHz + if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { + return 0; // FAIL + } + + // Output clock on MCO1 pin(PA8) for debugging purpose +#if DEBUG_MCO == 1 + 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 (MCO) +#endif + + return 1; // OK +} +#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; + RCC_PeriphCLKInitTypeDef PeriphClkInitStruct; + + /* 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 = 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 = 360; // VCO output clock = 360 MHz (1 MHz * 360) + RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; // PLLCLK = 180 MHz (360 MHz / 2) + RCC_OscInitStruct.PLL.PLLQ = 7; // + RCC_OscInitStruct.PLL.PLLQ = 6; // + 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 PLLSAI output as USB clock source + PeriphClkInitStruct.PLLSAI.PLLSAIM = 8; + PeriphClkInitStruct.PLLSAI.PLLSAIN = 192; + PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV8; + PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CLK48; + PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48CLKSOURCE_PLLSAIP; + HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct); + + /* 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 MHz + RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4; // 45 MHz + RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; // 90 MHz + if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK) { + return 0; // FAIL + } + + // Output clock on MCO1 pin(PA8) for debugging purpose +#if DEBUG_MCO == 1 + HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI, RCC_MCODIV_1); // 16 MHz +#endif + + return 1; // OK +} +#endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */ +