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u0-decibels/Drivers/STM32U0xx_HAL_Driver/Src/stm32u0xx_hal_rcc.c

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/**
******************************************************************************
* @file stm32u0xx_hal_rcc.c
* @author MCD Application Team
* @brief RCC HAL module driver.
* This file provides firmware functions to manage the following
* functionalities of the Reset and Clock Control (RCC) peripheral:
* + Initialization and de-initialization functions
* + Peripheral Control functions
*
@verbatim
==============================================================================
##### RCC specific features #####
==============================================================================
[..]
After reset the device is running from Multiple Speed Internal oscillator
(4 MHz) with Flash 0 wait state. Flash prefetch buffer, D-Cache
and I-Cache are disabled, and all peripherals are off except internal
SRAM, Flash and JTAG.
(+) There is no prescaler on High speed (AHBs) and Low speed (APBs) busses:
all peripherals mapped on these busses are running at MSI speed.
(+) The clock for all peripherals is switched off, except the SRAM and FLASH.
(+) All GPIOs are in analog mode, except the JTAG pins which
are assigned to be used for debug purpose.
[..]
Once the device started from reset, the user application has to:
(+) Configure the clock source to be used to drive the System clock
(if the application needs higher frequency/performance)
(+) Configure the System clock frequency and Flash settings
(+) Configure the AHB and APB busses prescalers
(+) Enable the clock for the peripheral(s) to be used
(+) Configure the clock source(s) for peripherals which clocks are not
derived from the System clock (RTC, ADC, USB FS/RNG)
@endverbatim
******************************************************************************
* @attention
*
* Copyright (c) 2023 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32u0xx_hal.h"
/** @addtogroup STM32U0xx_HAL_Driver
* @{
*/
/** @defgroup RCC RCC
* @brief RCC HAL module driver
* @{
*/
#ifdef HAL_RCC_MODULE_ENABLED
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup RCC_Private_Constants RCC Private Constants
* @{
*/
#define LSI_TIMEOUT_VALUE ((uint32_t)17UL) /* 17 ms (LSI maximum timeout is LSI startup time +
LSI_VALUE/128 when LSI prediv is used) */
#if defined(RCC_CRRCR_HSI48ON)
#define HSI48_TIMEOUT_VALUE ((uint32_t)2U) /* 2 ms (minimum Tick + 1) */
#endif /* RCC_CRRCR_HSI48ON */
#define PLL_TIMEOUT_VALUE ((uint32_t)2U) /* 2 ms (minimum Tick + 1) */
#define CLOCKSWITCH_TIMEOUT_VALUE ((uint32_t)5000U) /* 5 s */
/**
* @}
*/
/* Private macro -------------------------------------------------------------*/
/** @defgroup RCC_Private_Macros RCC Private Macros
* @{
*/
#define RCC_GET_MCO_GPIO_PIN(__RCC_MCOx__) ((__RCC_MCOx__) & GPIO_PIN_MASK)
#define RCC_GET_MCO_GPIO_AF(__RCC_MCOx__) (((__RCC_MCOx__) & RCC_MCO_GPIOAF_MASK) >> RCC_MCO_GPIOAF_POS)
#define RCC_GET_MCO_GPIO_INDEX(__RCC_MCOx__) (((__RCC_MCOx__) & RCC_MCO_GPIOPORT_MASK) >> RCC_MCO_GPIOPORT_POS)
#define RCC_GET_MCO_GPIO_PORT(__RCC_MCOx__) \
(((IOPORT_BASE) + ((0x00000400UL) * RCC_GET_MCO_GPIO_INDEX((__RCC_MCOx__)))))
#define RCC_PLL_OSCSOURCE_CONFIG(__HAL_RCC_PLLSOURCE__) \
(MODIFY_REG(RCC->PLLCFGR, RCC_PLLCFGR_PLLSRC, (__HAL_RCC_PLLSOURCE__)))
/**
* @}
*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/** @defgroup RCC_Private_Functions RCC Private Functions
* @{
*/
static HAL_StatusTypeDef RCC_SetFlashLatencyFromMSIRange(uint32_t msirange);
/**
* @}
*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup RCC_Exported_Functions RCC Exported Functions
* @{
*/
/** @defgroup RCC_Exported_Functions_Group1 Initialization and de-initialization functions
* @brief Initialization and Configuration functions
*
@verbatim
===============================================================================
##### Initialization and de-initialization functions #####
===============================================================================
[..]
This section provides functions allowing to configure the internal and external oscillators
(HSE, HSI, LSE, MSI, LSI, PLL, CSS and MCO) and the System busses clocks (SYSCLK, AHB, APB).
[..] Internal/external clock and PLL configuration
(+) HSI (high-speed internal): 16 MHz factory-trimmed RC used directly or through
the PLL as System clock source.
(+) MSI (Multiple Speed Internal): Its frequency is software trimmable from 100KHZ to 48MHZ.
It can be used to generate the clock for the USB OTG FS (48 MHz).
The number of flash wait states is automatically adjusted when MSI range is updated with
HAL_RCC_OscConfig() and the MSI is used as System clock source.
(+) LSI (low-speed internal): 32 KHz low consumption RC used as IWDG and/or RTC
clock source.
(+) HSE (high-speed external): 4 to 48 MHz crystal oscillator used directly or
through the PLL as System clock source. Can be used also optionally as RTC clock source.
(+) LSE (low-speed external): 32.768 KHz oscillator used optionally as RTC clock source.
(+) PLL (clocked by HSI, HSE or MSI) providing up to three independent output clocks:
(++) The first output is used to generate the high speed system clock (up to 80MHz).
(++) The second output is used to generate the clock for the USB OTG FS (48 MHz),
the random analog generator (<=48 MHz) and the SDMMC1 (<= 48 MHz).
(++) The third output is used to generate an accurate clock to achieve
high-quality audio performance on SAI interface.
(+) CSS (Clock security system): once enabled, if a HSE clock failure occurs
(HSE used directly or through PLL as System clock source), the System clock
is automatically switched to HSI and an interrupt is generated if enabled.
The interrupt is linked to the Cortex-M4 NMI (Non-Maskable Interrupt)
exception vector.
(+) MCO (microcontroller clock output): used to output MSI, LSI, HSI, LSE, HSE or
main PLL clock (through a configurable prescaler) on PA8 pin.
[..] System, AHB and APB busses clocks configuration
(+) Several clock sources can be used to drive the System clock (SYSCLK): MSI, HSI,
HSE and main PLL.
The AHB clock (HCLK) is derived from System clock through configurable
prescaler and used to clock the CPU, memory and peripherals mapped
on AHB bus (DMA, GPIO...). APB (PCLK) clocks are derived
from AHB clock through configurable prescalers and used to clock
the peripherals mapped on these busses. You can use
"HAL_RCC_GetSysClockFreq()" function to retrieve the frequencies of these clocks.
-@- All the peripheral clocks are derived from the System clock (SYSCLK) except:
(+@) RTC: the RTC clock can be derived either from the LSI, LSE or HSE clock
divided by 2 to 31.
You have to use __HAL_RCC_RTC_ENABLE() and HAL_RCCEx_PeriphCLKConfig() function
to configure this clock.
(+@) USB FS and RNG: USB FS requires a frequency equal to 48 MHz
to work correctly, while the RNG peripherals require a frequency
equal or lower than to 48 MHz. This clock is derived of the main PLL
through PLLQ divider. You have to enable the peripheral clock and use
HAL_RCCEx_PeriphCLKConfig() function to configure this clock.
(+@) IWDG clock which is always the LSI clock.
(+) The maximum frequency of the SYSCLK, HCLK, PCLK1 is 48 MHz.
The clock source frequency should be adapted depending on the device voltage range
as listed in the Reference Manual "Clock source frequency versus voltage scaling" chapter.
@endverbatim
Table 1. HCLK clock frequency for other STM32U0 devices
+-------------------------------------------------------+
| Latency | HCLK clock frequency (MHz) |
| |-------------------------------------|
| | voltage range 1 | voltage range 2 |
| | 1.2 V | 1.0 V |
|-----------------|------------------|------------------|
|0WS(1 CPU cycles)| HCLK <= 24 | 0 < HCLK <= 8 |
|-----------------|------------------|------------------|
|1WS(2 CPU cycles)| < HCLK <= 48 | 8 < HCLK <= 16 |
|-----------------|------------------|------------------|
|2WS(3 CPU cycles)| HCLK <= 56 | 16 < HCLK <= 18 |
+-------------------------------------------------------+
* @{
*/
/**
* @brief Reset the RCC clock configuration to the default reset state.
* @note The default reset state of the clock configuration is given below:
* - MSI ON and used as system clock source
* - HSE, HSI and PLL OFF
* - AHB, APB prescaler set to 1.
* - CSS, MCO OFF
* - All interrupts disabled
* @note This function doesn't modify the configuration of the
* - Peripheral clocks
* - LSI, LSE and RTC clocks
* @retval None
*/
HAL_StatusTypeDef HAL_RCC_DeInit(void)
{
uint32_t tickstart;
/* Get start tick*/
tickstart = HAL_GetTick();
/* Set MSION bit */
SET_BIT(RCC->CR, RCC_CR_MSION);
/* Insure MSIRDY bit is set before writing default MSISRANGE value */
while (READ_BIT(RCC->CR, RCC_CR_MSIRDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_MSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Set MSIRANGE default value */
MODIFY_REG(RCC->CR, RCC_CR_MSIRANGE, RCC_MSIRANGE_6);
/* Reset CFGR register (MSI is selected as system clock source) */
CLEAR_REG(RCC->CFGR);
/* Update the SystemCoreClock global variable for MSI as system clock source */
SystemCoreClock = MSI_VALUE;
/* Configure the source of time base considering new system clock settings */
if (HAL_InitTick(uwTickPrio) != HAL_OK)
{
return HAL_ERROR;
}
/* Insure MSI selected as system clock source */
/* Get start tick */
tickstart = HAL_GetTick();
/* Wait till clock switch is ready */
while (READ_BIT(RCC->CFGR, RCC_CFGR_SWS) != 0U)
{
if ((HAL_GetTick() - tickstart) > CLOCKSWITCH_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Reset HSION, HSIKERON, HSIASFS, HSEON, HSECSSON, PLLON bits */
CLEAR_BIT(RCC->CR, RCC_CR_HSION | RCC_CR_HSIKERON | RCC_CR_HSIASFS | RCC_CR_HSEON | RCC_CR_CSSON | RCC_CR_PLLON);
/* Reset HSEBYP bits */
CLEAR_BIT(RCC->CR, RCC_CR_HSEBYP);
/* Get Start Tick */
tickstart = HAL_GetTick();
/* Wait till PLL is disabled */
while (READ_BIT(RCC->CR, RCC_CR_PLLRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > PLL_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Reset PLLCFGR register */
CLEAR_REG(RCC->PLLCFGR);
SET_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLN_4);
/* Disable all interrupts */
CLEAR_REG(RCC->CIER);
/* Clear all interrupts flags */
CLEAR_REG(RCC->CICR);
/* Reset all CSR flags */
SET_BIT(RCC->CSR, RCC_CSR_RMVF);
/* Update the SystemCoreClock global variable */
SystemCoreClock = MSI_VALUE;
/* Adapt Systick interrupt period */
if (HAL_InitTick(TICK_INT_PRIORITY) != HAL_OK)
{
return HAL_ERROR;
}
else
{
return HAL_OK;
}
}
/**
* @brief Initialize the RCC Oscillators according to the specified parameters in the
* RCC_OscInitTypeDef.
* @param RCC_OscInitStruct pointer to an RCC_OscInitTypeDef structure that
* contains the configuration information for the RCC Oscillators.
* @note The PLL is not disabled when used as system clock.
* @note Transitions LSE Bypass to LSE On and LSE On to LSE Bypass are not
* supported by this macro. User should request a transition to LSE Off
* first and then LSE On or LSE Bypass.
* @note Transition HSE Bypass to HSE On and HSE On to HSE Bypass are not
* supported by this macro. User should request a transition to HSE Off
* first and then HSE On or HSE Bypass.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_RCC_OscConfig(RCC_OscInitTypeDef *RCC_OscInitStruct)
{
uint32_t tickstart;
HAL_StatusTypeDef status;
uint32_t sysclk_source;
uint32_t pll_config;
/* Check the parameters */
assert_param(RCC_OscInitStruct != NULL);
assert_param(IS_RCC_OSCILLATORTYPE(RCC_OscInitStruct->OscillatorType));
sysclk_source = __HAL_RCC_GET_SYSCLK_SOURCE();
pll_config = __HAL_RCC_GET_PLL_OSCSOURCE();
/*----------------------------- MSI Configuration --------------------------*/
if (((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_MSI) == RCC_OSCILLATORTYPE_MSI)
{
/* Check the parameters */
assert_param(IS_RCC_MSI(RCC_OscInitStruct->MSIState));
assert_param(IS_RCC_MSICALIBRATION_VALUE(RCC_OscInitStruct->MSICalibrationValue));
assert_param(IS_RCC_MSI_CLOCK_RANGE(RCC_OscInitStruct->MSIClockRange));
/* Check if MSI is used as system clock or as PLL source when PLL is selected as system clock */
if ((sysclk_source == RCC_SYSCLKSOURCE_STATUS_MSI) ||
((sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && (pll_config == RCC_PLLSOURCE_MSI)))
{
if ((READ_BIT(RCC->CR, RCC_CR_MSIRDY) != 0U) && (RCC_OscInitStruct->MSIState == RCC_MSI_OFF))
{
return HAL_ERROR;
}
/* Otherwise, just the calibration and MSI range change are allowed */
else
{
/* To correctly read data from FLASH memory, the number of wait states (LATENCY)
must be correctly programmed according to the frequency of the CPU clock
(HCLK) and the supply voltage of the device. */
if (RCC_OscInitStruct->MSIClockRange > __HAL_RCC_GET_MSI_RANGE())
{
/* First increase number of wait states update if necessary */
if (RCC_SetFlashLatencyFromMSIRange(RCC_OscInitStruct->MSIClockRange) != HAL_OK)
{
return HAL_ERROR;
}
/* Selects the Multiple Speed oscillator (MSI) clock range .*/
__HAL_RCC_MSI_RANGE_CONFIG(RCC_OscInitStruct->MSIClockRange);
/* Adjusts the Multiple Speed oscillator (MSI) calibration value.*/
__HAL_RCC_MSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->MSICalibrationValue);
}
else
{
/* Else, keep current flash latency while decreasing applies */
/* Selects the Multiple Speed oscillator (MSI) clock range .*/
__HAL_RCC_MSI_RANGE_CONFIG(RCC_OscInitStruct->MSIClockRange);
/* Adjusts the Multiple Speed oscillator (MSI) calibration value.*/
__HAL_RCC_MSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->MSICalibrationValue);
/* Decrease number of wait states update if necessary */
/* Only possible when MSI is the System clock source */
if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_MSI)
{
if (RCC_SetFlashLatencyFromMSIRange(RCC_OscInitStruct->MSIClockRange) != HAL_OK)
{
return HAL_ERROR;
}
}
}
/* Update the SystemCoreClock global variable */
SystemCoreClock = HAL_RCC_GetSysClockFreq() >> (AHBPrescTable[READ_BIT(RCC->CFGR, RCC_CFGR_HPRE) \
>> RCC_CFGR_HPRE_Pos] & 0x1FU);
/* Configure the source of time base considering new system clocks settings*/
status = HAL_InitTick(uwTickPrio);
if (status != HAL_OK)
{
return status;
}
}
}
else
{
/* Check the MSI State */
if (RCC_OscInitStruct->MSIState != RCC_MSI_OFF)
{
/* Enable the Internal High Speed oscillator (MSI). */
__HAL_RCC_MSI_ENABLE();
/* Get timeout */
tickstart = HAL_GetTick();
/* Wait till MSI is ready */
while (READ_BIT(RCC->CR, RCC_CR_MSIRDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_MSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Selects the Multiple Speed oscillator (MSI) clock range .*/
__HAL_RCC_MSI_RANGE_CONFIG(RCC_OscInitStruct->MSIClockRange);
/* Adjusts the Multiple Speed oscillator (MSI) calibration value.*/
__HAL_RCC_MSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->MSICalibrationValue);
}
else
{
/* Disable the Internal High Speed oscillator (MSI). */
__HAL_RCC_MSI_DISABLE();
/* Get timeout */
tickstart = HAL_GetTick();
/* Wait till MSI is ready */
while (READ_BIT(RCC->CR, RCC_CR_MSIRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_MSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
}
/*------------------------------- HSE Configuration ------------------------*/
if (((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSE) == RCC_OSCILLATORTYPE_HSE)
{
/* Check the parameters */
assert_param(IS_RCC_HSE(RCC_OscInitStruct->HSEState));
/* When the HSE is used as system clock or clock source for PLL in these cases it is not allowed to be disabled */
if ((sysclk_source == RCC_SYSCLKSOURCE_STATUS_HSE) ||
((sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && (pll_config == RCC_PLLSOURCE_HSE)))
{
if ((READ_BIT(RCC->CR, RCC_CR_HSERDY) != 0U) && (RCC_OscInitStruct->HSEState == RCC_HSE_OFF))
{
return HAL_ERROR;
}
}
else
{
/* Set the new HSE configuration ---------------------------------------*/
__HAL_RCC_HSE_CONFIG(RCC_OscInitStruct->HSEState);
/* Check the HSE State */
if (RCC_OscInitStruct->HSEState != RCC_HSE_OFF)
{
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till HSE is ready */
while (READ_BIT(RCC->CR, RCC_CR_HSERDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_HSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
else
{
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till HSE is disabled */
while (READ_BIT(RCC->CR, RCC_CR_HSERDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_HSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
}
/*----------------------------- HSI Configuration --------------------------*/
if (((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSI) == RCC_OSCILLATORTYPE_HSI)
{
/* Check the parameters */
assert_param(IS_RCC_HSI(RCC_OscInitStruct->HSIState));
assert_param(IS_RCC_HSI_CALIBRATION_VALUE(RCC_OscInitStruct->HSICalibrationValue));
/* Check if HSI is used as system clock or as PLL source when PLL is selected as system clock */
if ((sysclk_source == RCC_SYSCLKSOURCE_STATUS_HSI) ||
((sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && (pll_config == RCC_PLLSOURCE_HSI)))
{
/* When HSI is used as system clock it will not be disabled */
if ((READ_BIT(RCC->CR, RCC_CR_HSIRDY) != 0U) && (RCC_OscInitStruct->HSIState == RCC_HSI_OFF))
{
return HAL_ERROR;
}
/* Otherwise, just the calibration is allowed */
else
{
/* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/
__HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue);
}
}
else
{
/* Check the HSI State */
if (RCC_OscInitStruct->HSIState != RCC_HSI_OFF)
{
/* Enable the Internal High Speed oscillator (HSI). */
__HAL_RCC_HSI_ENABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till HSI is ready */
while (READ_BIT(RCC->CR, RCC_CR_HSIRDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_HSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Adjusts the Internal High Speed oscillator (HSI) calibration value.*/
__HAL_RCC_HSI_CALIBRATIONVALUE_ADJUST(RCC_OscInitStruct->HSICalibrationValue);
}
else
{
/* Disable the Internal High Speed oscillator (HSI). */
__HAL_RCC_HSI_DISABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till HSI is disabled */
while (READ_BIT(RCC->CR, RCC_CR_HSIRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_HSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
}
/*------------------------------ LSI Configuration -------------------------*/
if (((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSI) == RCC_OSCILLATORTYPE_LSI)
{
/* Check the parameters */
assert_param(IS_RCC_LSI(RCC_OscInitStruct->LSIState));
assert_param(IS_RCC_LSIDIV(RCC_OscInitStruct->LSIDiv));
/* Check the LSI State */
if ((RCC_OscInitStruct->LSIState) != RCC_LSI_OFF)
{
/* Apply prescaler value */
if (RCC_OscInitStruct->LSIDiv == RCC_LSI_DIV1)
{
CLEAR_BIT(RCC->CSR, RCC_CSR_LSIPREDIV);
}
else
{
SET_BIT(RCC->CSR, RCC_CSR_LSIPREDIV);
}
/* Enable the Internal Low Speed oscillator (LSI). */
__HAL_RCC_LSI_ENABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till LSI is ready */
while (__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > LSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
else
{
/* Disable the Internal Low Speed oscillator (LSI). */
__HAL_RCC_LSI_DISABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till LSI is ready */
while (__HAL_RCC_GET_FLAG(RCC_FLAG_LSIRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > LSI_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
/*------------------------------ LSE Configuration -------------------------*/
if (((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_LSE) == RCC_OSCILLATORTYPE_LSE)
{
FlagStatus pwrclkchanged = RESET;
/* Check the parameters */
assert_param(IS_RCC_LSE(RCC_OscInitStruct->LSEState));
/* Update LSE configuration in Backup Domain control register */
/* Requires to enable write access to Backup Domain of necessary */
if (HAL_IS_BIT_CLR(RCC->APBENR1, RCC_APBENR1_PWREN))
{
__HAL_RCC_PWR_CLK_ENABLE();
pwrclkchanged = SET;
}
if (HAL_IS_BIT_CLR(PWR->CR1, PWR_CR1_DBP))
{
/* Enable write access to Backup domain */
SET_BIT(PWR->CR1, PWR_CR1_DBP);
/* Wait for Backup domain Write protection disable */
tickstart = HAL_GetTick();
while (HAL_IS_BIT_CLR(PWR->CR1, PWR_CR1_DBP))
{
if ((HAL_GetTick() - tickstart) > RCC_DBP_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
/* Set the new LSE configuration -----------------------------------------*/
if ((RCC_OscInitStruct->LSEState & RCC_BDCR_LSEON) != 0U)
{
if ((RCC_OscInitStruct->LSEState & RCC_BDCR_LSEBYP) != 0U)
{
/* LSE oscillator bypass enable */
SET_BIT(RCC->BDCR, RCC_BDCR_LSEBYP);
SET_BIT(RCC->BDCR, RCC_BDCR_LSEON);
}
else
{
/* LSE oscillator enable */
SET_BIT(RCC->BDCR, RCC_BDCR_LSEON);
}
}
else
{
CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSEON);
CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSEBYP);
}
/* Check the LSE State */
if (RCC_OscInitStruct->LSEState != RCC_LSE_OFF)
{
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till LSE is ready */
while (READ_BIT(RCC->BDCR, RCC_BDCR_LSERDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_LSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Enable LSESYS additionally if requested */
if ((RCC_OscInitStruct->LSEState & RCC_BDCR_LSESYSEN) != 0U)
{
SET_BIT(RCC->BDCR, RCC_BDCR_LSESYSEN);
/* Wait till LSESYS is ready */
while (READ_BIT(RCC->BDCR, RCC_BDCR_LSESYSRDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_LSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
else
{
/* Make sure LSESYSEN/LSESYSRDY are reset */
CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSESYSEN);
/* Wait till LSESYSRDY is cleared */
while (READ_BIT(RCC->BDCR, RCC_BDCR_LSESYSRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_LSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
else
{
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till LSE is disabled */
while (READ_BIT(RCC->BDCR, RCC_BDCR_LSERDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_LSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
if (READ_BIT(RCC->BDCR, RCC_BDCR_LSESYSEN) != 0U)
{
/* Reset LSESYSEN once LSE is disabled */
CLEAR_BIT(RCC->BDCR, RCC_BDCR_LSESYSEN);
/* Wait till LSESYSRDY is cleared */
while (READ_BIT(RCC->BDCR, RCC_BDCR_LSESYSRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > RCC_LSE_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
/* Restore clock configuration if changed */
if (pwrclkchanged == SET)
{
__HAL_RCC_PWR_CLK_DISABLE();
}
}
#if defined(RCC_CRRCR_HSI48ON)
/*------------------------------ HSI48 Configuration -----------------------*/
if (((RCC_OscInitStruct->OscillatorType) & RCC_OSCILLATORTYPE_HSI48) == RCC_OSCILLATORTYPE_HSI48)
{
/* Check the parameters */
assert_param(IS_RCC_HSI48(RCC_OscInitStruct->HSI48State));
/* Check the HSI48 State */
if (RCC_OscInitStruct->HSI48State != RCC_HSI48_OFF)
{
/* Enable the Internal Low Speed oscillator (HSI48). */
__HAL_RCC_HSI48_ENABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till HSI48 is ready */
while (READ_BIT(RCC->CRRCR, RCC_CRRCR_HSI48RDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > HSI48_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
else
{
/* Disable the Internal Low Speed oscillator (HSI48). */
__HAL_RCC_HSI48_DISABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till HSI48 is disabled */
while (READ_BIT(RCC->CRRCR, RCC_CRRCR_HSI48RDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > HSI48_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
#endif /* RCC_CRRCR_HSI48ON */
/*-------------------------------- PLL Configuration -----------------------*/
/* Check the parameters */
assert_param(IS_RCC_PLL(RCC_OscInitStruct->PLL.PLLState));
if (RCC_OscInitStruct->PLL.PLLState != RCC_PLL_NONE)
{
/* Check if the PLL is used as system clock or not */
if (__HAL_RCC_GET_SYSCLK_SOURCE() != RCC_SYSCLKSOURCE_STATUS_PLLCLK)
{
if (RCC_OscInitStruct->PLL.PLLState == RCC_PLL_ON)
{
/* Check the parameters */
assert_param(IS_RCC_PLLSOURCE(RCC_OscInitStruct->PLL.PLLSource));
assert_param(IS_RCC_PLL_DIVM_VALUE(RCC_OscInitStruct->PLL.PLLM));
assert_param(IS_RCC_PLL_MULN_VALUE(RCC_OscInitStruct->PLL.PLLN));
assert_param(IS_RCC_PLL_DIVP_VALUE(RCC_OscInitStruct->PLL.PLLP));
assert_param(IS_RCC_PLL_DIVQ_VALUE(RCC_OscInitStruct->PLL.PLLQ));
assert_param(IS_RCC_PLL_DIVR_VALUE(RCC_OscInitStruct->PLL.PLLR));
/* Disable the main PLL. */
__HAL_RCC_PLL_DISABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till PLL is ready */
while (READ_BIT(RCC->CR, RCC_CR_PLLRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > PLL_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
/* Configure the main PLL clock source, multiplication and division factors. */
__HAL_RCC_PLL_CONFIG(RCC_OscInitStruct->PLL.PLLSource,
RCC_OscInitStruct->PLL.PLLM,
RCC_OscInitStruct->PLL.PLLN,
RCC_OscInitStruct->PLL.PLLP,
RCC_OscInitStruct->PLL.PLLQ,
RCC_OscInitStruct->PLL.PLLR);
/* Enable PLL System Clock output */
__HAL_RCC_PLLCLKOUT_ENABLE(RCC_PLL_DIVR);
/* Enable the main PLL. */
__HAL_RCC_PLL_ENABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till PLL is ready */
while (READ_BIT(RCC->CR, RCC_CR_PLLRDY) == 0U)
{
if ((HAL_GetTick() - tickstart) > PLL_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
else
{
/* Disable the main PLL. */
__HAL_RCC_PLL_DISABLE();
/* Get Start Tick*/
tickstart = HAL_GetTick();
/* Wait till PLL is disabled */
while (READ_BIT(RCC->CR, RCC_CR_PLLRDY) != 0U)
{
if ((HAL_GetTick() - tickstart) > PLL_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
}
else
{
return HAL_ERROR;
}
}
return HAL_OK;
}
HAL_StatusTypeDef HAL_RCC_ClockConfig(const RCC_ClkInitTypeDef *const RCC_ClkInitStruct, uint32_t FLatency)
{
HAL_StatusTypeDef halstatus;
uint32_t tickstart;
/* Check the parameters */
assert_param(RCC_ClkInitStruct != NULL);
assert_param(IS_RCC_CLOCKTYPE((uint8_t)RCC_ClkInitStruct->ClockType));
assert_param(IS_FLASH_LATENCY(FLatency));
/* To correctly read data from FLASH memory, the number of wait states (LATENCY)
must be correctly programmed according to the frequency of the CPU clock
(HCLK) and the supply voltage of the device. */
/* Increasing the number of wait states because of higher CPU frequency */
if (FLatency > __HAL_FLASH_GET_LATENCY())
{
/* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */
__HAL_FLASH_SET_LATENCY(FLatency);
/* Check that the new number of wait states is taken into account to access the Flash
memory by reading the FLASH_ACR register */
if (__HAL_FLASH_GET_LATENCY() != FLatency)
{
return HAL_ERROR;
}
}
/*------------------------- SYSCLK Configuration ---------------------------*/
if (((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_SYSCLK) == RCC_CLOCKTYPE_SYSCLK)
{
assert_param(IS_RCC_SYSCLKSOURCE(RCC_ClkInitStruct->SYSCLKSource));
/* PLL is selected as System Clock Source */
if (RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_PLLCLK)
{
/* Check the PLL ready flag */
if (READ_BIT(RCC->CR, RCC_CR_PLLRDY) == 0U)
{
return HAL_ERROR;
}
}
else
{
if (RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSE)
{
/* Check the HSE ready flag */
if (READ_BIT(RCC->CR, RCC_CR_HSERDY) == 0U)
{
return HAL_ERROR;
}
}
/* MSI is selected as System Clock Source */
else if (RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_MSI)
{
/* Check the MSI ready flag */
if (READ_BIT(RCC->CR, RCC_CR_MSIRDY) == 0U)
{
return HAL_ERROR;
}
}
/* HSI is selected as System Clock Source */
else if (RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_HSI)
{
/* Check the HSI ready flag */
if (READ_BIT(RCC->CR, RCC_CR_HSIRDY) == 0U)
{
return HAL_ERROR;
}
}
/* LSI is selected as System Clock Source */
else if (RCC_ClkInitStruct->SYSCLKSource == RCC_SYSCLKSOURCE_LSI)
{
/* Check the LSI ready flag */
if (READ_BIT(RCC->CSR, RCC_CSR_LSIRDY) == 0U)
{
return HAL_ERROR;
}
}
/* LSE is selected as System Clock Source */
else
{
/* Check the LSE ready flag */
if (READ_BIT(RCC->BDCR, RCC_BDCR_LSERDY) == 0U)
{
return HAL_ERROR;
}
}
}
MODIFY_REG(RCC->CFGR, RCC_CFGR_SW, RCC_ClkInitStruct->SYSCLKSource);
/* Get Start Tick */
tickstart = HAL_GetTick();
while (__HAL_RCC_GET_SYSCLK_SOURCE() != (RCC_ClkInitStruct->SYSCLKSource << RCC_CFGR_SWS_Pos))
{
if ((HAL_GetTick() - tickstart) > CLOCKSWITCH_TIMEOUT_VALUE)
{
return HAL_TIMEOUT;
}
}
}
/*-------------------------- HCLK Configuration --------------------------*/
if (((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_HCLK) == RCC_CLOCKTYPE_HCLK)
{
/* Set the new HCLK clock divider */
assert_param(IS_RCC_HCLK(RCC_ClkInitStruct->AHBCLKDivider));
MODIFY_REG(RCC->CFGR, RCC_CFGR_HPRE, RCC_ClkInitStruct->AHBCLKDivider);
}
/* Decreasing the number of wait states because of lower CPU frequency */
if (FLatency < __HAL_FLASH_GET_LATENCY())
{
/* Program the new number of wait states to the LATENCY bits in the FLASH_ACR register */
__HAL_FLASH_SET_LATENCY(FLatency);
/* Check that the new number of wait states is taken into account to access the Flash
memory by reading the FLASH_ACR register */
if (__HAL_FLASH_GET_LATENCY() != FLatency)
{
return HAL_ERROR;
}
}
/*-------------------------- PCLK Configuration ---------------------------*/
if (((RCC_ClkInitStruct->ClockType) & RCC_CLOCKTYPE_PCLK1) == RCC_CLOCKTYPE_PCLK1)
{
assert_param(IS_RCC_PCLK(RCC_ClkInitStruct->APB1CLKDivider));
MODIFY_REG(RCC->CFGR, RCC_CFGR_PPRE, RCC_ClkInitStruct->APB1CLKDivider);
}
/* Update the SystemCoreClock global variable */
SystemCoreClock = HAL_RCC_GetSysClockFreq() >> (AHBPrescTable[READ_BIT(RCC->CFGR, RCC_CFGR_HPRE) \
>> RCC_CFGR_HPRE_Pos] & 0x1FU);
/* Configure the source of time base considering new system clocks settings*/
halstatus = HAL_InitTick(TICK_INT_PRIORITY);
return halstatus;
}
/**
* @}
*/
/**
* @}
*/
/** @defgroup RCC_Exported_Functions_Group2 Peripheral Control functions
* @brief RCC clocks control functions
*
@verbatim
===============================================================================
##### Peripheral Control functions #####
===============================================================================
[..]
This subsection provides a set of functions allowing to:
(+) Output clock to MCO pin.
(+) Retrieve current clock frequencies.
(+) Enable the Clock Security System.
@endverbatim
* @{
*/
/**
* @brief Select the clock source to output on MCO pin(PA8).
* @note PA8 should be configured in alternate function mode.
* @param RCC_MCOx specifies the output direction for the clock source.
* For STM32U0xx family this parameter can have these values:
* @arg @ref RCC_MCO1 Clock source to output on MCO1 pin(PA8).
* @arg @ref RCC_MCO1 Clock source to output on MCO1 pin(PA9).
* @arg @ref RCC_MCO1 Clock source to output on MCO1 pin(PF2).
* @arg @ref RCC_MCO2 Clock source to output on MCO2 pin(PA10).
* @arg @ref RCC_MCO2 Clock source to output on MCO2 pin(PC2).
* @arg @ref RCC_MCO2 Clock source to output on MCO2 pin(PA8).
* @param RCC_MCOSource specifies the clock source to output.
* This parameter can be one of the following values:
* @arg @ref RCC_MCO1SOURCE_NOCLOCK MCO output disabled, no clock on MCO
* @arg @ref RCC_MCO1SOURCE_SYSCLK system clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_MSI MSI clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_HSI HSI clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_HSE HSE clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_PLLR main PLL clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_LSI LSI clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_LSE LSE clock selected as MCO source
* @arg @ref RCC_MCO1SOURCE_HSI48 HSI48 clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_NOCLOCK MCO output disabled, no clock on MCO
* @arg @ref RCC_MCO2SOURCE_SYSCLK system clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_MSI MSI clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_HSI HSI clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_HSE HSE clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_PLLR main PLL clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_LSI LSI clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_LSE LSE clock selected as MCO source
* @arg @ref RCC_MCO2SOURCE_HSI48 HSI48 clock selected as MCO source
* @param RCC_MCODiv specifies the MCO prescaler.
* This parameter can be one of the following values:
* @arg @ref RCC_MCO1DIV_1 division by 1 applied to MCO clock
* @arg @ref RCC_MCO1DIV_2 division by 2 applied to MCO clock
* @arg @ref RCC_MCO1DIV_4 division by 4 applied to MCO clock
* @arg @ref RCC_MCO1DIV_8 division by 8 applied to MCO clock
* @arg @ref RCC_MCO1DIV_16 division by 16 applied to MCO clock
* @arg @ref RCC_MCO1DIV_32 division by 32 applied to MCO clock
* @arg @ref RCC_MCO1DIV_64 division by 64 applied to MCO clock
* @arg @ref RCC_MCO1DIV_128 division by 128 applied to MCO clock
* @arg @ref RCC_MCO1DIV_256 division by 256 applied to MCO clock
* @arg @ref RCC_MCO1DIV_512 division by 512 applied to MCO clock
* @arg @ref RCC_MCO1DIV_1024 division by 1024 applied to MCO clock
* @arg @ref RCC_MCO2DIV_1 division by 1 applied to MCO clock
* @arg @ref RCC_MCO2DIV_2 division by 2 applied to MCO clock
* @arg @ref RCC_MCO2DIV_4 division by 4 applied to MCO clock
* @arg @ref RCC_MCO2DIV_8 division by 8 applied to MCO clock
* @arg @ref RCC_MCO2DIV_16 division by 16 applied to MCO clock
* @arg @ref RCC_MCO2DIV_32 division by 32 applied to MCO clock
* @arg @ref RCC_MCO2DIV_64 division by 64 applied to MCO clock
* @arg @ref RCC_MCO2DIV_128 division by 128 applied to MCO clock
* @arg @ref RCC_MCO2DIV_256 division by 256 applied to MCO clock
* @arg @ref RCC_MCO2DIV_512 division by 512 applied to MCO clock
* @arg @ref RCC_MCO2DIV_1024 division by 1024 applied to MCO clock
* @retval None
*/
void HAL_RCC_MCOConfig(uint32_t RCC_MCOx, uint32_t RCC_MCOSource, uint32_t RCC_MCODiv)
{
GPIO_InitTypeDef GPIO_InitStruct;
uint32_t mcoindex;
uint32_t mco_gpio_index;
GPIO_TypeDef *mco_gpio_port;
/* Check the parameters */
assert_param(IS_RCC_MCO(RCC_MCOx));
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Pull = GPIO_NOPULL;
/* Get MCOx selection */
mcoindex = RCC_MCOx & RCC_MCO_INDEX_MASK;
/* Get MCOx GPIO Port */
mco_gpio_port = (GPIO_TypeDef *) RCC_GET_MCO_GPIO_PORT(RCC_MCOx);
/* MCOx Clock Enable */
mco_gpio_index = RCC_GET_MCO_GPIO_INDEX(RCC_MCOx);
SET_BIT(RCC->IOPENR, (1UL << mco_gpio_index));
/* Configure the MCOx pin in alternate function mode */
GPIO_InitStruct.Pin = RCC_GET_MCO_GPIO_PIN(RCC_MCOx);
GPIO_InitStruct.Alternate = RCC_GET_MCO_GPIO_AF(RCC_MCOx);
HAL_GPIO_Init(mco_gpio_port, &GPIO_InitStruct);
if (mcoindex == RCC_MCO1_INDEX)
{
assert_param(IS_RCC_MCO1DIV(RCC_MCODiv));
assert_param(IS_RCC_MCO1SOURCE(RCC_MCOSource));
/* Mask MCO1 and MCO1PRE[3:0] bits then Select MCO1 clock source and pre-scaler */
MODIFY_REG(RCC->CFGR, (RCC_CFGR_MCO1SEL | RCC_CFGR_MCO1PRE), (RCC_MCOSource | RCC_MCODiv));
}
else if (mcoindex == RCC_MCO2_INDEX)
{
assert_param(IS_RCC_MCO2DIV(RCC_MCODiv));
assert_param(IS_RCC_MCO2SOURCE(RCC_MCOSource));
/* Mask MCO2 and MCO2PRE[3:0] bits then Select MCO2 clock source and pre-scaler */
MODIFY_REG(RCC->CFGR, (RCC_CFGR_MCO2SEL | RCC_CFGR_MCO2PRE), (RCC_MCOSource | RCC_MCODiv));
}
else
{
/* unexpected case: added to resolve MISRA 15.7 rule */
}
}
/**
* @brief Return the SYSCLK frequency.
*
* @note The system frequency computed by this function is not the real
* frequency in the chip. It is calculated based on the predefined
* constant and the selected clock source:
* @note If SYSCLK source is MSI, function returns values based on MSI
* Value as defined by the MSI range.
* @note If SYSCLK source is HSI, function returns values based on HSI_VALUE(*)
* @note If SYSCLK source is HSE, function returns values based on HSE_VALUE(**)
* @note If SYSCLK source is PLL, function returns values based on HSE_VALUE(**),
* HSI_VALUE(*) or MSI Value multiplied/divided by the PLL factors.
* @note (*) HSI_VALUE is a constant defined in stm32u0xx_hal_conf.h file (default value
* 16 MHz) but the real value may vary depending on the variations
* in voltage and temperature.
* @note (**) HSE_VALUE is a constant defined in stm32u0xx_hal_conf.h file (default value
* 8 MHz), user has to ensure that HSE_VALUE is same as the real
* frequency of the crystal used. Otherwise, this function may
* have wrong result.
*
* @note The result of this function could be not correct when using fractional
* value for HSE crystal.
*
* @note This function can be used by the user application to compute the
* baudrate for the communication peripherals or configure other parameters.
*
* @note Each time SYSCLK changes, this function must be called to update the
* right SYSCLK value. Otherwise, any configuration based on this function will be incorrect.
*
*
* @retval SYSCLK frequency
*/
uint32_t HAL_RCC_GetSysClockFreq(void)
{
uint32_t msirange = 0U;
uint32_t sysclockfreq = 0U;
uint32_t pllvco;
uint32_t pllsource;
uint32_t pllr;
uint32_t pllm;
uint32_t sysclk_source;
uint32_t pll_oscsource;
uint32_t pllsourcefreq;
sysclk_source = __HAL_RCC_GET_SYSCLK_SOURCE();
pll_oscsource = __HAL_RCC_GET_PLL_OSCSOURCE();
if ((sysclk_source == RCC_SYSCLKSOURCE_STATUS_MSI) ||
((sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK) && (pll_oscsource == RCC_PLLSOURCE_MSI)))
{
/* MSI or PLL with MSI source used as system clock source */
/* Get SYSCLK source */
if (READ_BIT(RCC->CR, RCC_CR_MSIRGSEL) == 0U)
{
/* MSISRANGE from RCC_CSR applies */
msirange = READ_BIT(RCC->CSR, RCC_CSR_MSISTBYRG) >> RCC_CSR_MSISTBYRG_Pos;
}
else
{
/* MSIRANGE from RCC_CR applies */
msirange = READ_BIT(RCC->CR, RCC_CR_MSIRANGE) >> RCC_CR_MSIRANGE_Pos;
}
/*MSI frequency range in HZ*/
if (msirange > 11U)
{
msirange = 0U;
}
msirange = MSIRangeTable[msirange];
if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_MSI)
{
/* MSI used as system clock source */
sysclockfreq = msirange;
}
}
else if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_HSI)
{
/* HSI used as system clock source */
sysclockfreq = HSI_VALUE;
}
else if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_HSE)
{
/* HSE used as system clock source */
sysclockfreq = HSE_VALUE;
}
else if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_LSI)
{
/* LSI used as system clock source */
sysclockfreq = LSI_VALUE;
}
else if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_LSE)
{
/* LSE used as system clock source */
sysclockfreq = LSE_VALUE;
}
else
{
/* unexpected case: sysclockfreq at 0 */
}
if (sysclk_source == RCC_SYSCLKSOURCE_STATUS_PLLCLK)
{
/* PLL used as system clock source */
/* The allowed input (pllinput/M) frequency range is from 2.66 to 16 MHZ */
/* PLL_VCO = (HSE_VALUE or HSI_VALUE or MSI_VALUE) * PLLN / PLLM
SYSCLK = PLL_VCO / PLLR
*/
pllsource = READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLSRC);
pllm = ((RCC->PLLCFGR & RCC_PLLCFGR_PLLM) >> RCC_PLLCFGR_PLLM_Pos) + 1U ;
switch (pllsource)
{
case RCC_PLLSOURCE_HSI: /* HSI used as PLL clock source */
pllsourcefreq = HSI_VALUE;
break;
case RCC_PLLSOURCE_HSE: /* HSE used as PLL clock source */
pllsourcefreq = HSE_VALUE;
break;
case RCC_PLLSOURCE_MSI: /* MSI used as PLL clock source */
default:
pllsourcefreq = msirange;
break;
}
pllvco = (pllsourcefreq * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> RCC_PLLCFGR_PLLN_Pos)) / pllm ;
pllr = ((READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLR) >> RCC_PLLCFGR_PLLR_Pos) + 1U);
sysclockfreq = pllvco / pllr;
}
return sysclockfreq;
}
/**
* @brief Return the HCLK frequency.
* @note Each time HCLK changes, this function must be called to update the
* right HCLK value. Otherwise, any configuration based on this function will be incorrect.
*
* @note The SystemCoreClock CMSIS variable is used to store System Clock Frequency.
* @retval HCLK frequency in Hz
*/
uint32_t HAL_RCC_GetHCLKFreq(void)
{
return SystemCoreClock;
}
/**
* @brief Return the PCLK frequency.
* @note Each time PCLK changes, this function must be called to update the
* right PCLK1 value. Otherwise, any configuration based on this function will be incorrect.
* @retval PCLK1 frequency in Hz
*/
uint32_t HAL_RCC_GetPCLK1Freq(void)
{
/* Get HCLK source and Compute PCLK1 frequency ---------------------------*/
return (HAL_RCC_GetHCLKFreq() >> (APBPrescTable[READ_BIT(RCC->CFGR, RCC_CFGR_PPRE) >> RCC_CFGR_PPRE_Pos] & 0x1FU));
}
/**
* @brief Configure the RCC_OscInitStruct according to the internal
* RCC configuration registers.
* @param RCC_OscInitStruct pointer to an RCC_OscInitTypeDef structure that
* will be configured.
* @retval None
*/
void HAL_RCC_GetOscConfig(RCC_OscInitTypeDef *RCC_OscInitStruct)
{
uint32_t regval;
/* Check the parameters */
assert_param(RCC_OscInitStruct != NULL);
#if defined(RCC_CRRCR_HSI48ON)
/* Set all possible values for the Oscillator type parameter ---------------*/
RCC_OscInitStruct->OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_MSI | \
RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_HSI48;
#else
/* Set all possible values for the Oscillator type parameter ---------------*/
RCC_OscInitStruct->OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_MSI | \
RCC_OSCILLATORTYPE_LSE | RCC_OSCILLATORTYPE_LSI;
#endif /* RCC_CRRCR_HSI48ON */
/* Get the HSE configuration -----------------------------------------------*/
if ((RCC->CR & RCC_CR_HSEBYP) == RCC_CR_HSEBYP)
{
RCC_OscInitStruct->HSEState = RCC_HSE_BYPASS;
}
else if ((RCC->CR & RCC_CR_HSEON) == RCC_CR_HSEON)
{
RCC_OscInitStruct->HSEState = RCC_HSE_ON;
}
else
{
RCC_OscInitStruct->HSEState = RCC_HSE_OFF;
}
/* Get the HSI configuration -----------------------------------------------*/
if ((RCC->CR & RCC_CR_HSION) == RCC_CR_HSION)
{
RCC_OscInitStruct->HSIState = RCC_HSI_ON;
}
else
{
RCC_OscInitStruct->HSIState = RCC_HSI_OFF;
}
RCC_OscInitStruct->HSICalibrationValue = ((RCC->ICSCR & RCC_ICSCR_HSITRIM) >> RCC_ICSCR_HSITRIM_Pos);
/* Get the MSI configuration -----------------------------------------------*/
if ((RCC->CR & RCC_CR_MSION) == RCC_CR_MSION)
{
RCC_OscInitStruct->MSIState = RCC_MSI_ON;
}
else
{
RCC_OscInitStruct->MSIState = RCC_MSI_OFF;
}
RCC_OscInitStruct->MSICalibrationValue = READ_BIT(RCC->ICSCR, RCC_ICSCR_MSITRIM) >> RCC_ICSCR_MSITRIM_Pos;
RCC_OscInitStruct->MSIClockRange = READ_BIT(RCC->CR, RCC_CR_MSIRANGE);
/* Get the LSE configuration -----------------------------------------------*/
/* Get BDCR register */
regval = RCC->BDCR;
if (READ_BIT(RCC->BDCR, RCC_BDCR_LSEBYP) == RCC_BDCR_LSEBYP)
{
if (((regval & RCC_BDCR_LSEON) == RCC_BDCR_LSEON)
&& ((regval & RCC_BDCR_LSESYSEN) == RCC_BDCR_LSESYSEN))
{
RCC_OscInitStruct->LSEState = RCC_LSE_BYPASS;
}
else
{
RCC_OscInitStruct->LSEState = RCC_LSE_BYPASS_RTC_ONLY;
}
}
else if (READ_BIT(RCC->BDCR, RCC_BDCR_LSEON) == RCC_BDCR_LSEON)
{
if (READ_BIT(RCC->BDCR, RCC_BDCR_LSESYSEN) == RCC_BDCR_LSESYSEN)
{
RCC_OscInitStruct->LSEState = RCC_LSE_ON;
}
else
{
RCC_OscInitStruct->LSEState = RCC_LSE_ON_RTC_ONLY;
}
}
else
{
RCC_OscInitStruct->LSEState = RCC_LSE_OFF;
}
/* Get the LSI configuration -----------------------------------------------*/
if (READ_BIT(RCC->CSR, RCC_CSR_LSION) == RCC_CSR_LSION)
{
RCC_OscInitStruct->LSIState = RCC_LSI_ON;
}
else
{
RCC_OscInitStruct->LSIState = RCC_LSI_OFF;
}
if ((RCC->CSR & RCC_CSR_LSIPREDIV) == RCC_CSR_LSIPREDIV)
{
RCC_OscInitStruct->LSIDiv = RCC_LSI_DIV128;
}
else
{
RCC_OscInitStruct->LSIDiv = RCC_LSI_DIV1;
}
#if defined(RCC_CRRCR_HSI48ON)
/* Get the HSI48 configuration ---------------------------------------------*/
if (READ_BIT(RCC->CRRCR, RCC_CRRCR_HSI48ON) == RCC_CRRCR_HSI48ON)
{
RCC_OscInitStruct->HSI48State = RCC_HSI48_ON;
}
else
{
RCC_OscInitStruct->HSI48State = RCC_HSI48_OFF;
}
#endif /* RCC_CRRCR_HSI48ON */
/* Get the PLL configuration -----------------------------------------------*/
if (READ_BIT(RCC->CR, RCC_CR_PLLON) == RCC_CR_PLLON)
{
RCC_OscInitStruct->PLL.PLLState = RCC_PLL_ON;
}
else
{
RCC_OscInitStruct->PLL.PLLState = RCC_PLL_OFF;
}
RCC_OscInitStruct->PLL.PLLSource = READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLSRC);
RCC_OscInitStruct->PLL.PLLM = (READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLM));
RCC_OscInitStruct->PLL.PLLN = READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLN) >> RCC_PLLCFGR_PLLN_Pos;
RCC_OscInitStruct->PLL.PLLQ = ((READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLQ)));
RCC_OscInitStruct->PLL.PLLR = ((READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLR)));
RCC_OscInitStruct->PLL.PLLP = ((READ_BIT(RCC->PLLCFGR, RCC_PLLCFGR_PLLP)));
}
/**
* @brief Configure the RCC_ClkInitStruct according to the internal
* RCC configuration registers.
* @param RCC_ClkInitStruct pointer to an RCC_ClkInitTypeDef structure that
* will be configured.
* @param pFLatency Pointer on the Flash Latency.
* @retval None
*/
void HAL_RCC_GetClockConfig(RCC_ClkInitTypeDef *RCC_ClkInitStruct, uint32_t *pFLatency)
{
/* Check the parameters */
assert_param(RCC_ClkInitStruct != NULL);
assert_param(pFLatency != NULL);
/* Set all possible values for the Clock type parameter --------------------*/
RCC_ClkInitStruct->ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1;
/* Get the SYSCLK configuration --------------------------------------------*/
RCC_ClkInitStruct->SYSCLKSource = (uint32_t)(RCC->CFGR & RCC_CFGR_SW);
/* Get the HCLK configuration ----------------------------------------------*/
RCC_ClkInitStruct->AHBCLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_HPRE);
/* Get the APB1 configuration ----------------------------------------------*/
RCC_ClkInitStruct->APB1CLKDivider = (uint32_t)(RCC->CFGR & RCC_CFGR_PPRE);
/* Get the Flash Wait State (Latency) configuration ------------------------*/
*pFLatency = (uint32_t)(FLASH->ACR & FLASH_ACR_LATENCY);
}
/**
* @brief Enables the Clock Security System.
* @note If a failure is detected on the HSE oscillator clock, this oscillator
* is automatically disabled and an interrupt is generated to inform the
* software about the failure (Clock Security System Interrupt, CSSI),
* allowing the MCU to perform rescue operations. The CSSI is linked to
* the Cortex-M0+ NMI (Non-Maskable Interrupt) exception vector.
* @retval None
*/
void HAL_RCC_EnableCSS(void)
{
SET_BIT(RCC->CR, RCC_CR_CSSON) ;
}
/* * @brief Handle the RCC Clock Security System interrupt request.
* @note This API should be called under the NMI_Handler().
* @retval None
*/
void HAL_RCC_NMI_IRQHandler(void)
{
/* Check RCC CSSF interrupt flag */
if (__HAL_RCC_GET_IT(RCC_IT_CSS))
{
/* RCC Clock Security System interrupt user callback */
HAL_RCC_CSSCallback();
/* Clear RCC CSS pending bit */
__HAL_RCC_CLEAR_IT(RCC_IT_CSS);
}
}
/**
* @brief RCC Clock Security System interrupt callback.
* @retval none
*/
__weak void HAL_RCC_CSSCallback(void)
{
/* NOTE : This function should not be modified, when the callback is needed,
the HAL_RCC_CSSCallback should be implemented in the user file
*/
}
/**
* @brief Get and clear reset flags
* @note Once reset flags are retrieved, this API is clearing them in order
* to isolate next reset reason.
* @retval can be a combination of @ref RCC_Reset_Flag
*/
uint32_t HAL_RCC_GetResetSource(void)
{
uint32_t reset;
/* Get all reset flags */
reset = RCC->CSR & RCC_RESET_FLAG_ALL;
/* Clear Reset flags */
RCC->CSR |= RCC_CSR_RMVF;
return reset;
}
/**
* @}
*/
/**
* @}
*/
/* Private function prototypes -----------------------------------------------*/
/** @addtogroup RCC_Private_Functions
* @{
*/
/**
* @brief Update number of Flash wait states in line with MSI range and current
voltage range.
* @param msirange MSI range value from RCC_MSISRANGE_0 to RCC_MSISRANGE_15
* @retval HAL status
*/
static HAL_StatusTypeDef RCC_SetFlashLatencyFromMSIRange(uint32_t msirange)
{
uint32_t vos;
uint32_t latency = FLASH_LATENCY_0; /* default value 0WS */
if (__HAL_RCC_PWR_IS_CLK_ENABLED())
{
vos = HAL_PWREx_GetVoltageRange();
}
else
{
__HAL_RCC_PWR_CLK_ENABLE();
vos = HAL_PWREx_GetVoltageRange();
__HAL_RCC_PWR_CLK_DISABLE();
}
if (vos == PWR_REGULATOR_VOLTAGE_SCALE1)
{
if (msirange > RCC_MSIRANGE_8)
{
/* MSI > 16Mhz */
if (msirange > RCC_MSIRANGE_11)
{
/* MSI 48Mhz */
latency = FLASH_LATENCY_2; /* 2WS */
}
else if (msirange > RCC_MSIRANGE_9)
{
/* MSI 24Mhz or 32Mhz */
latency = FLASH_LATENCY_1; /* 1WS */
}
else
{
/* MSI 16Mhz */
latency = FLASH_LATENCY_0; /* 0WS */
}
}
/* else MSI <= 16Mhz default FLASH_LATENCY_0 0WS */
}
else
{
if (msirange >= RCC_MSIRANGE_8)
{
/* MSI > 16Mhz */
latency = FLASH_LATENCY_2; /* 3WS */
}
else if (msirange == RCC_MSIRANGE_7)
{
/* MSI 8Mhz */
latency = FLASH_LATENCY_1; /* 1WS */
}
else
{
/* MSI 16Mhz */
latency = FLASH_LATENCY_0; /* 0WS */
}
/* else MSI < 8Mhz default FLASH_LATENCY_0 0WS */
}
__HAL_FLASH_SET_LATENCY(latency);
/* Check that the new number of wait states is taken into account to access the Flash
memory by reading the FLASH_ACR register */
if ((FLASH->ACR & FLASH_ACR_LATENCY) != latency)
{
return HAL_ERROR;
}
return HAL_OK;
}
/**
* @}
*/
#endif /* HAL_RCC_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/