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nuttx/arch/arm/src/stm32f0l0g0/stm32l0_rcc.c

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/****************************************************************************
* arch/arm/src/stm32f0l0g0/stm32l0_rcc.c
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Mateusz Szafoni <raiden00@railab.me>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include "stm32_pwr.h"
#include "hardware/stm32_syscfg.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Allow up to 100 milliseconds for the high speed clock to become ready.
* that is a very long delay, but if the clock does not become ready we are
* hosed anyway. Normally this is very fast, but I have seen at least one
* board that required this long, long timeout for the HSE to be ready.
*/
#define HSERDY_TIMEOUT (100 * CONFIG_BOARD_LOOPSPERMSEC)
/* HSE divisor to yield ~1MHz RTC clock (valid for HSE = 8MHz) */
#define HSE_DIVISOR RCC_CR_RTCPRE_HSEd8
/* Determine if board wants to use HSI48 as 48 MHz oscillator. */
#if defined(CONFIG_STM32F0L0G0_HAVE_HSI48) && defined(STM32_USE_CLK48)
# if STM32_CLK48_SEL == RCC_CCIPR_CLK48SEL_HSI48
# define STM32_USE_HSI48
# ifndef CONFIG_STM32F0L0G0_VREFINT
# error VREFINT must be enabled if HSI48 used
# endif
# endif
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: rcc_reset
*
* Description:
* Put all RCC registers in reset state
*
****************************************************************************/
static inline void rcc_reset(void)
{
uint32_t regval;
/* Set the appropriate bits in the APB2ENR register to enabled the
* selected APB2 peripherals.
*/
regval = getreg32(STM32_RCC_APB2ENR);
#if 1
/* DBG clock enable */
regval |= RCC_APB2ENR_DBGEN;
#endif
putreg32(regval, STM32_RCC_APB2ENR);
}
/****************************************************************************
* Name: rcc_enableio
*
* Description:
* Enable selected GPIO
*
****************************************************************************/
static inline void rcc_enableio(void)
{
uint32_t regval = 0;
/* REVISIT: */
regval |= (RCC_IOPENR_IOPAEN | RCC_IOPENR_IOPBEN | RCC_IOPENR_IOPCEN | \
RCC_IOPENR_IOPDEN | RCC_IOPENR_IOPEEN | RCC_IOPENR_IOPHEN);
putreg32(regval, STM32_RCC_IOPENR); /* Enable GPIO */
}
/****************************************************************************
* Name: rcc_enableahb
*
* Description:
* Enable selected AHB peripherals
*
****************************************************************************/
static inline void rcc_enableahb(void)
{
uint32_t regval = 0;
/* Set the appropriate bits in the AHBENR register to enabled the
* selected AHBENR peripherals.
*/
regval = getreg32(STM32_RCC_AHBENR);
#ifdef CONFIG_STM32F0L0G0_DMA1
/* DMA 1 clock enable */
regval |= RCC_AHBENR_DMA1EN;
#endif
#ifdef CONFIG_STM32F0L0G0_MIF
/* Memory interface clock enable */
regval |= RCC_AHBENR_MIFEN;
#endif
#ifdef CONFIG_STM32F0L0G0_CRC
/* CRC clock enable */
regval |= RCC_AHBENR_CRCEN;
#endif
#ifdef CONFIG_STM32F0L0G0_TSC
/* TSC clock enable */
regval |= RCC_AHBENR_TSCEN;
#endif
#ifdef CONFIG_STM32F0L0G0_RNG
/* Random number generator clock enable */
regval |= RCC_AHBENR_RNGEN;
#endif
putreg32(regval, STM32_RCC_AHBENR); /* Enable peripherals */
}
/****************************************************************************
* Name: rcc_enableapb1
*
* Description:
* Enable selected APB1 peripherals
*
****************************************************************************/
static inline void rcc_enableapb1(void)
{
uint32_t regval;
/* Set the appropriate bits in the APB1ENR register to enabled the
* selected APB1 peripherals.
*/
regval = getreg32(STM32_RCC_APB1ENR);
#ifdef CONFIG_STM32F0L0G0_TIM2
/* Timer 2 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_TIM2EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_TIM3
/* Timer 3 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_TIM3EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_TIM6
/* Timer 6 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_TIM6EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_TIM7
/* Timer 7 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_TIM7EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_LCD
/* LCD clock enable */
regval |= RCC_APB1ENR_LCDEN;
#endif
#ifdef CONFIG_STM32F0L0G0_WWDG
/* Window Watchdog clock enable */
regval |= RCC_APB1ENR_WWDGEN;
#endif
#ifdef CONFIG_STM32F0L0G0_SPI2
/* SPI 2 clock enable */
regval |= RCC_APB1ENR_SPI2EN;
#endif
#ifdef CONFIG_STM32F0L0G0_USART2
/* USART 2 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_USART2EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_USART3
/* USART 3 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_USART3EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_USART4
/* USART 4 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_USART4EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_USART5
/* USART 5 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_USART5EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_I2C1
/* I2C 1 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_I2C1EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_I2C2
/* I2C 2 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_I2C2EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_USB
/* USB clock enable */
regval |= RCC_APB1ENR_USBEN;
#endif
#ifdef CONFIG_STM32F0L0G0_CRS
/* Clock recovery system clock enable */
regval |= RCC_APB1ENR_CRSEN;
#endif
#ifdef CONFIG_STM32F0L0G0_PWR
/* Power interface clock enable */
regval |= RCC_APB1ENR_PWREN;
#endif
#ifdef CONFIG_STM32F0L0G0_DAC1
/* DAC 1 interface clock enable */
regval |= RCC_APB1ENR_DAC1EN;
#endif
#ifdef CONFIG_STM32F0L0G0_I2C3
/* I2C 3 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB1ENR_I2C4EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_LPTIM1
/* LPTIM1 clock enable */
regval |= RCC_APB1ENR_LPTIM1EN;
#endif
putreg32(regval, STM32_RCC_APB1ENR);
}
/****************************************************************************
* Name: rcc_enableapb2
*
* Description:
* Enable selected APB2 peripherals
*
****************************************************************************/
static inline void rcc_enableapb2(void)
{
uint32_t regval;
/* Set the appropriate bits in the APB2ENR register to enabled the
* selected APB2 peripherals.
*/
regval = getreg32(STM32_RCC_APB2ENR);
#ifdef CONFIG_STM32F0L0G0_SYSCFG
/* SYSCFG clock */
regval |= RCC_APB2ENR_SYSCFGEN;
#endif
#ifdef CONFIG_STM32F0L0G0_TIM21
/* TIM21 Timer clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB2ENR_TIM21EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_TIM22
/* TIM22 Timer clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB2ENR_TIM10EN;
#endif
#endif
#ifdef CONFIG_STM32F0L0G0_ADC1
/* ADC 1 clock enable */
regval |= RCC_APB2ENR_ADC1EN;
#endif
#ifdef CONFIG_STM32F0L0G0_SPI1
/* SPI 1 clock enable */
regval |= RCC_APB2ENR_SPI1EN;
#endif
#ifdef CONFIG_STM32F0L0G0_USART1
/* USART1 clock enable */
#ifdef CONFIG_STM32F0L0G0_FORCEPOWER
regval |= RCC_APB2ENR_USART1EN;
#endif
#endif
#if 0
/* DBG clock enable */
regval |= RCC_APB2ENR_DBGEN;
#endif
putreg32(regval, STM32_RCC_APB2ENR);
}
/****************************************************************************
* Name: rcc_enableccip
*
* Description:
* Set peripherals independent clock configuration.
*
****************************************************************************/
static inline void rcc_enableccip(void)
{
uint32_t regval;
/* Certain peripherals have no clock selected even when their enable bit is
* set. Set some defaults in the CCIPR register so those peripherals
* will at least have a clock.
*/
regval = getreg32(STM32_RCC_CCIPR);
#if defined(STM32_USE_CLK48)
regval |= STM32_CLK48_SEL;
#endif
putreg32(regval, STM32_RCC_CCIPR);
}
/****************************************************************************
* Name: stm32_rcc_enablehse
*
* Description:
* Enable the External High-Speed (HSE) Oscillator.
*
****************************************************************************/
#if (STM32_CFGR_PLLSRC == RCC_CFGR_PLLSRC) || (STM32_SYSCLK_SW == RCC_CFGR_SW_HSE)
static inline bool stm32_rcc_enablehse(void)
{
uint32_t regval;
volatile int32_t timeout;
/* Enable External High-Speed Clock (HSE) */
regval = getreg32(STM32_RCC_CR);
#ifdef STM32_HSEBYP_ENABLE /* May be defined in board.h header file */
regval |= RCC_CR_HSEBYP; /* Enable HSE clock bypass */
#else
regval &= ~RCC_CR_HSEBYP; /* Disable HSE clock bypass */
#endif
regval |= RCC_CR_HSEON; /* Enable HSE */
putreg32(regval, STM32_RCC_CR);
/* Wait until the HSE is ready (or until a timeout elapsed) */
for (timeout = HSERDY_TIMEOUT; timeout > 0; timeout--)
{
/* Check if the HSERDY flag is set in the CR */
if ((getreg32(STM32_RCC_CR) & RCC_CR_HSERDY) != 0)
{
/* If so, then return TRUE */
return true;
}
}
/* In the case of a timeout starting the HSE, we really don't have a
* strategy. This is almost always a hardware failure or misconfiguration.
*/
return false;
}
#endif
/****************************************************************************
* Name: stm32_stdclockconfig
*
* Description:
* Called to change to new clock based on settings in board.h.
*
* NOTE: This logic would need to be extended if you need to select low-
* power clocking modes or any clocking other than PLL driven by the HSE.
*
****************************************************************************/
#ifndef CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG
static void stm32_stdclockconfig(void)
{
uint32_t regval;
#if defined(CONFIG_STM32F0L0G0_RTC_HSECLOCK) || defined(CONFIG_LCD_HSECLOCK)
uint16_t pwrcr;
#endif
uint32_t pwr_vos;
bool flash_1ws;
/* Enable PWR clock from APB1 to give access to PWR_CR register */
regval = getreg32(STM32_RCC_APB1ENR);
regval |= RCC_APB1ENR_PWREN;
putreg32(regval, STM32_RCC_APB1ENR);
/* Go to the high performance voltage range 1 if necessary. In this mode,
* the PLL VCO frequency can be up to 96MHz. USB and SDIO can be supported.
*
* Range 1: PLLVCO up to 96MHz in range 1 (1.8V)
* Range 2: PLLVCO up to 48MHz in range 2 (1.5V) (default)
* Range 3: PLLVCO up to 24MHz in range 3 (1.2V)
*
* Range 1: SYSCLK up to 32Mhz
* Range 2: SYSCLK up to 16Mhz
* Range 3: SYSCLK up to 4.2Mhz
*
* Range 1: Flash 1WS if SYSCLK > 16Mhz
* Range 2: Flash 1WS if SYSCLK > 8Mhz
* Range 3: Flash 1WS if SYSCLK > 2.1Mhz
*/
pwr_vos = PWR_CR_VOS_SCALE_2;
flash_1ws = false;
#ifdef STM32_PLL_FREQUENCY
if (STM32_PLL_FREQUENCY > 48000000)
{
pwr_vos = PWR_CR_VOS_SCALE_1;
}
#endif
if (STM32_SYSCLK_FREQUENCY > 16000000)
{
pwr_vos = PWR_CR_VOS_SCALE_1;
}
if ((pwr_vos == PWR_CR_VOS_SCALE_1 && STM32_SYSCLK_FREQUENCY > 16000000) ||
(pwr_vos == PWR_CR_VOS_SCALE_2 && STM32_SYSCLK_FREQUENCY > 8000000))
{
flash_1ws = true;
}
stm32_pwr_setvos(pwr_vos);
#if defined(CONFIG_STM32F0L0G0_RTC_HSECLOCK) || defined(CONFIG_LCD_HSECLOCK)
/* If RTC / LCD selects HSE as clock source, the RTC prescaler
* needs to be set before HSEON bit is set.
*/
/* The RTC domain has write access denied after reset,
* you have to enable write access using DBP bit in the PWR CR
* register before to selecting the clock source ( and the PWR
* peripheral must be enabled)
*/
regval = getreg32(STM32_RCC_APB1ENR);
regval |= RCC_APB1ENR_PWREN;
putreg32(regval, STM32_RCC_APB1ENR);
pwrcr = getreg16(STM32_PWR_CR);
putreg16(pwrcr | PWR_CR_DBP, STM32_PWR_CR);
/* Set the RTC clock divisor */
regval = getreg32(STM32_RCC_CSR);
regval &= ~RCC_CSR_RTCSEL_MASK;
regval |= RCC_CSR_RTCSEL_HSE;
putreg32(regval, STM32_RCC_CSR);
regval = getreg32(STM32_RCC_CR);
regval &= ~RCC_CR_RTCPRE_MASK;
regval |= HSE_DIVISOR;
putreg32(regval, STM32_RCC_CR);
/* Restore the previous state of the DBP bit */
putreg32(regval, STM32_PWR_CR);
#endif
/* Enable the source clock for the PLL (via HSE or HSI), HSE, and HSI. */
#if (STM32_SYSCLK_SW == RCC_CFGR_SW_HSE) || \
((STM32_SYSCLK_SW == RCC_CFGR_SW_PLL) && (STM32_CFGR_PLLSRC == RCC_CFGR_PLLSRC))
/* The PLL is using the HSE, or the HSE is the system clock. In either
* case, we need to enable HSE clocking.
*/
if (!stm32_rcc_enablehse())
{
/* In the case of a timeout starting the HSE, we really don't have a
* strategy. This is almost always a hardware failure or
* misconfiguration (for example, if no crystal is fitted on the board.
*/
return;
}
#elif (STM32_SYSCLK_SW == RCC_CFGR_SW_HSI) || \
((STM32_SYSCLK_SW == RCC_CFGR_SW_PLL) && STM32_CFGR_PLLSRC == 0)
/* The PLL is using the HSI, or the HSI is the system clock. In either
* case, we need to enable HSI clocking.
*/
regval = getreg32(STM32_RCC_CR); /* Enable the HSI */
regval |= RCC_CR_HSION;
putreg32(regval, STM32_RCC_CR);
/* Wait until the HSI clock is ready. Since this is an internal clock, no
* timeout is expected
*/
while ((getreg32(STM32_RCC_CR) & RCC_CR_HSIRDY) == 0);
#endif
#if (STM32_SYSCLK_SW != RCC_CFGR_SW_MSI)
/* Increasing the CPU frequency (in the same voltage range):
*
* After reset, the used clock is the MSI (2 MHz) with 0 WS configured in the
* FLASH_ACR register. 32-bit access is enabled and prefetch is disabled.
* ST strongly recommends to use the following software sequences to tune the
* number of wait states needed to access the Flash memory with the CPU
* frequency.
*
* - Program the 64-bit access by setting the ACC64 bit in Flash access
* control register (FLASH_ACR)
* - Check that 64-bit access is taken into account by reading FLASH_ACR
* - Program 1 WS to the LATENCY bit in FLASH_ACR
* - Check that the new number of WS is taken into account by reading FLASH_ACR
* - Modify the CPU clock source by writing to the SW bits in the Clock
* configuration register (RCC_CFGR)
* - If needed, modify the CPU clock prescaler by writing to the HPRE bits in
* RCC_CFGR
* - Check that the new CPU clock source or/and the new CPU clock prescaler
* value is/are taken into account by reading the clock source status (SWS
* bits) or/and the AHB prescaler value (HPRE bits), respectively, in the
* RCC_CFGR register
*/
regval = getreg32(STM32_FLASH_ACR);
regval |= FLASH_ACR_ACC64; /* 64-bit access mode */
putreg32(regval, STM32_FLASH_ACR);
if (flash_1ws)
{
regval |= FLASH_ACR_LATENCY; /* One wait state */
}
else
{
regval &= ~FLASH_ACR_LATENCY; /* Zero wait state */
}
putreg32(regval, STM32_FLASH_ACR);
/* Enable FLASH prefetch */
regval |= FLASH_ACR_PRFTEN;
putreg32(regval, STM32_FLASH_ACR);
#endif /* STM32_SYSCLK_SW != RCC_CFGR_SW_MSI */
/* Set the HCLK source/divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_HPRE_MASK;
regval |= STM32_RCC_CFGR_HPRE;
putreg32(regval, STM32_RCC_CFGR);
/* Set the PCLK2 divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_PPRE2_MASK;
regval |= STM32_RCC_CFGR_PPRE2;
putreg32(regval, STM32_RCC_CFGR);
/* Set the PCLK1 divider */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_PPRE1_MASK;
regval |= STM32_RCC_CFGR_PPRE1;
putreg32(regval, STM32_RCC_CFGR);
/* If we are using the PLL, configure and start it */
#if STM32_SYSCLK_SW == RCC_CFGR_SW_PLL
/* Set the PLL divider and multiplier. NOTE: The PLL needs to be disabled
* to do these operation. We know this is the case here because pll_reset()
* was previously called by stm32_clockconfig().
*/
regval = getreg32(STM32_RCC_CFGR);
regval &= ~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLMUL_MASK | RCC_CFGR_PLLDIV_MASK);
regval |= (STM32_CFGR_PLLSRC | STM32_CFGR_PLLMUL | STM32_CFGR_PLLDIV);
putreg32(regval, STM32_RCC_CFGR);
/* Enable the PLL */
regval = getreg32(STM32_RCC_CR);
regval |= RCC_CR_PLLON;
putreg32(regval, STM32_RCC_CR);
/* Wait until the PLL is ready */
while ((getreg32(STM32_RCC_CR) & RCC_CR_PLLRDY) == 0);
#endif
/* Select the system clock source (probably the PLL) */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~RCC_CFGR_SW_MASK;
regval |= STM32_SYSCLK_SW;
putreg32(regval, STM32_RCC_CFGR);
/* Wait until the selected source is used as the system clock source */
while ((getreg32(STM32_RCC_CFGR) & RCC_CFGR_SWS_MASK) != STM32_SYSCLK_SWS);
#if defined(CONFIG_STM32F0L0G0_IWDG) || \
defined(CONFIG_STM32F0L0G0_RTC_LSICLOCK) || defined(CONFIG_LCD_LSICLOCK)
/* Low speed internal clock source LSI
*
* TODO: There is another case where the LSI needs to
* be enabled: if the MCO pin selects LSI as source.
*/
stm32_rcc_enablelsi();
#endif
#if defined(CONFIG_STM32F0L0G0_RTC_LSECLOCK) || defined(CONFIG_LCD_LSECLOCK)
/* Low speed external clock source LSE
*
* TODO: There is another case where the LSE needs to
* be enabled: if the MCO pin selects LSE as source.
*
* TODO: There is another case where the LSE needs to
* be enabled: if TIM9-10 Channel 1 selects LSE as input.
*
* TODO: There is another case where the LSE needs to
* be enabled: if TIM10-11 selects LSE as ETR Input.
*
*/
stm32_rcc_enablelse();
#endif
}
#endif
/****************************************************************************
* Name: vrefint_enable
*
* Description:
* Enable and configure internal voltage reference (VREFINT)
*
****************************************************************************/
#ifdef CONFIG_STM32F0L0G0_VREFINT
static void vrefint_enable(void)
{
uint32_t regval = 0;
/* The HSI48 requires VREFINT and its reference to HSI48 */
regval = getreg32(STM32_SYSCFG_CFGR3);
/* Enable VREFINT */
regval |= SYSCFG_CFGR3_ENVREFINT;
putreg32(regval, STM32_SYSCFG_CFGR3);
#ifdef STM32_USE_HSI48
/* Enable VREFINT reference to HSI48 */
regval |= SYSCFG_CFGR3_ENBUFVREFINTHSI48;
#endif
/* Wait for VREFINT ready */
while ((getreg32(STM32_SYSCFG_CFGR3) & SYSCFG_CFGR3_VREFINTRDYF) == 0);
}
#endif
/****************************************************************************
* Name: rcc_enableperiphals
****************************************************************************/
static inline void rcc_enableperipherals(void)
{
rcc_enableccip();
rcc_enableio();
rcc_enableahb();
rcc_enableapb2();
rcc_enableapb1();
#ifdef CONFIG_STM32F0L0G0_VREFINT
vrefint_enable();
#endif
#ifdef STM32_USE_HSI48
/* Enable HSI48 clocking to support USB transfers or RNG */
stm32_enable_hsi48(STM32_HSI48_SYNCSRC);
#endif
}
/****************************************************************************
* Public Functions
****************************************************************************/
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