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mbed-os/targets/TARGET_STM/TARGET_STM32H5/clock_cfg/system_clock.c

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/* mbed Microcontroller Library
* SPDX-License-Identifier: BSD-3-Clause
******************************************************************************
*
* Copyright (c) 2015-2024 STMicroelectronics.
* All rights reserved.
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/**
* This file configures the system clock as follows:
*--------------------------------------------------------------------
* System clock source | 1- USE_PLL_HSE_EXTC
* | 2- USE_PLL_HSE_XTAL
* | 3- USE_PLL_HSI (internal 64 MHz clock)
*--------------------------------------------------------------------
* SYSCLK(MHz) | 250
* AHBCLK (MHz) | 250
* APB1CLK (MHz) | 250
* APB2CLK (MHz) | 250
* APB3CLK (MHz) | 250
* USB capable (48 MHz) | YES
*--------------------------------------------------------------------
**/
#include "stm32h5xx.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 - default option)
#define USE_PLL_HSE_XTAL 0x4 // Use external xtal (check User manual)
#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 Configures the System clock source
* @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 (MCO from STLink PCB part) */
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 */
/******************************************************************************/
MBED_WEAK uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
if(bypass) {
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
} else {
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
}
#if (HSE_VALUE < 4000000) || (HSE_VALUE > 50000000) && !((HSE_VALUE % 2000000 != 0) || (HSE_VALUE % 5000000 != 0))
#error HSE value must be >= 4MHz and <= 50MHz, and must be divisible by either 2 or 5!
#endif
if(HSE_VALUE % 2000000 == 0)
{
RCC_OscInitStruct.PLL.PLLM = HSE_VALUE / 2000000; // Divide down input clock to 2MHz
RCC_OscInitStruct.PLL.PLLN = 250; // Multiply up to 500MHz VCO clock
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1_VCIRANGE_1;
}
else // Divisible by 5MHz
{
RCC_OscInitStruct.PLL.PLLM = HSE_VALUE / 5000000; // Divide down input clock to 5MHz
RCC_OscInitStruct.PLL.PLLN = 100; // Multiply up to 500MHz VCO clock
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1_VCIRANGE_2;
}
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLL1_SOURCE_HSE;
RCC_OscInitStruct.PLL.PLLP = 2;
// Most of the SPI busses are clocked off of PLL1Q, and the max usable frequency for SPI is about
// ~50MHz. Plus, SPI has only limited, power-of-2 prescaler options so a high input clock really hurts
// its clock resolution. So, give it a much lower input clock.
RCC_OscInitStruct.PLL.PLLQ = 10; // output freq = 50MHz
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1_VCORANGE_WIDE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
return 0; // FAIL
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_PCLK3;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
return 0; // FAIL
}
#if DEVICE_USBDEVICE
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
return 0; // FAIL
}
#endif /* DEVICE_USBDEVICE */
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 = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLL1_SOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = 4;
RCC_OscInitStruct.PLL.PLLN = 31;
RCC_OscInitStruct.PLL.PLLP = 2;
// Most of the SPI busses are clocked off of PLL1Q, and the max usable frequency for SPI is about
// ~50MHz. Plus, SPI has only limited, power-of-2 prescaler options so a high input clock really hurts
// its clock resolution. So, give it a much lower input clock.
RCC_OscInitStruct.PLL.PLLQ = 10; // output freq = 50MHz
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1_VCIRANGE_3;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1_VCORANGE_WIDE;
RCC_OscInitStruct.PLL.PLLFRACN = 2048;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
return 0; // FAIL
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_PCLK3;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
{
return 0; // FAIL
}
#if DEVICE_USBDEVICE
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
return 0; // FAIL
}
#endif /* DEVICE_USBDEVICE */
return 1; // OK
}
#endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */
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