344 lines
10 KiB
C
344 lines
10 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file STM32F0xx/hal_lld.c
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* @brief STM32F0xx HAL subsystem low level driver source.
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*
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* @addtogroup HAL
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* @{
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*/
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#include "hal.h"
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief CMSIS system core clock variable.
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* @note It is declared in system_stm32f0xx.h.
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*/
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uint32_t SystemCoreClock = STM32_SYSCLK;
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Initializes the backup domain.
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* @note WARNING! Changing clock source impossible without resetting
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* of the whole BKP domain.
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*/
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static void hal_lld_backup_domain_init(void) {
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/* Backup domain access enabled and left open.*/
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PWR->CR |= PWR_CR_DBP;
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/* Reset BKP domain if different clock source selected.*/
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if ((RCC->BDCR & STM32_RTCSEL_MASK) != STM32_RTCSEL){
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/* Backup domain reset.*/
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RCC->BDCR = RCC_BDCR_BDRST;
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RCC->BDCR = 0;
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}
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/* If enabled then the LSE is started.*/
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#if STM32_LSE_ENABLED
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#if defined(STM32_LSE_BYPASS)
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/* LSE Bypass.*/
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RCC->BDCR |= STM32_LSEDRV | RCC_BDCR_LSEON | RCC_BDCR_LSEBYP;
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#else
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/* No LSE Bypass.*/
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RCC->BDCR |= STM32_LSEDRV | RCC_BDCR_LSEON;
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#endif
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while ((RCC->BDCR & RCC_BDCR_LSERDY) == 0)
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; /* Waits until LSE is stable. */
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#endif
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#if STM32_RTCSEL != STM32_RTCSEL_NOCLOCK
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/* If the backup domain hasn't been initialized yet then proceed with
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initialization.*/
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if ((RCC->BDCR & RCC_BDCR_RTCEN) == 0) {
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/* Selects clock source.*/
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RCC->BDCR |= STM32_RTCSEL;
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/* RTC clock enabled.*/
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RCC->BDCR |= RCC_BDCR_RTCEN;
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}
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#endif /* STM32_RTCSEL != STM32_RTCSEL_NOCLOCK */
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if defined(STM32_DMA_REQUIRED) || defined(__DOXYGEN__)
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#if defined(STM32_DMA1_CH23_HANDLER) || defined(__DOXYGEN__)
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/**
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* @brief DMA1 streams 2 and 3 shared ISR.
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* @note It is declared here because this device has a non-standard
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* DMA shared IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(STM32_DMA1_CH23_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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/* Check on channel 2.*/
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dmaServeInterrupt(STM32_DMA1_STREAM2);
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/* Check on channel 3.*/
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dmaServeInterrupt(STM32_DMA1_STREAM3);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* defined(STM32_DMA1_CH23_HANDLER) */
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#if defined(STM32_DMA1_CH4567_HANDLER) || defined(__DOXYGEN__)
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/**
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* @brief DMA1 streams 4, 5, 6 and 7 shared ISR.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(STM32_DMA1_CH4567_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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/* Check on channel 4.*/
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dmaServeInterrupt(STM32_DMA1_STREAM4);
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/* Check on channel 5.*/
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dmaServeInterrupt(STM32_DMA1_STREAM5);
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#if STM32_DMA1_NUM_CHANNELS > 5
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/* Check on channel 6.*/
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dmaServeInterrupt(STM32_DMA1_STREAM6);
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#endif
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#if STM32_DMA1_NUM_CHANNELS > 6
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/* Check on channel 7.*/
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dmaServeInterrupt(STM32_DMA1_STREAM7);
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#endif
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* defined(STM32_DMA1_CH4567_HANDLER) */
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#if defined(STM32_DMA12_CH23_CH12_HANDLER) || defined(__DOXYGEN__)
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/**
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* @brief DMA1 streams 2 and 3, DMA2 streams 1 and 1 shared ISR.
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* @note It is declared here because this device has a non-standard
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* DMA shared IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(STM32_DMA12_CH23_CH12_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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/* Check on channel 2 of DMA1.*/
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dmaServeInterrupt(STM32_DMA1_STREAM2);
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/* Check on channel 3 of DMA1.*/
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dmaServeInterrupt(STM32_DMA1_STREAM3);
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/* Check on channel 1 of DMA2.*/
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dmaServeInterrupt(STM32_DMA2_STREAM1);
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/* Check on channel 2 of DMA2.*/
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dmaServeInterrupt(STM32_DMA2_STREAM2);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* defined(STM32_DMA12_CH23_CH12_HANDLER) */
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#if defined(STM32_DMA12_CH4567_CH345_HANDLER) || defined(__DOXYGEN__)
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/**
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* @brief DMA1 streams 4, 5, 6 and 7, DMA2 streams 3, 4 and 5 shared ISR.
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* @note It is declared here because this device has a non-standard
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* DMA shared IRQ handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(STM32_DMA12_CH4567_CH345_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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/* Check on channel 4 of DMA1.*/
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dmaServeInterrupt(STM32_DMA1_STREAM4);
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/* Check on channel 5 of DMA1.*/
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dmaServeInterrupt(STM32_DMA1_STREAM5);
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/* Check on channel 6 of DMA1.*/
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dmaServeInterrupt(STM32_DMA1_STREAM6);
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/* Check on channel 7 of DMA1.*/
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dmaServeInterrupt(STM32_DMA1_STREAM7);
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/* Check on channel 3 of DMA2.*/
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dmaServeInterrupt(STM32_DMA2_STREAM3);
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/* Check on channel 4 of DMA2.*/
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dmaServeInterrupt(STM32_DMA2_STREAM4);
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/* Check on channel 5 of DMA2.*/
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dmaServeInterrupt(STM32_DMA2_STREAM5);
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* defined(STM32_DMA12_CH4567_CH345_HANDLER) */
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#endif /* defined(STM32_DMA_REQUIRED) */
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level HAL driver initialization.
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*
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* @notapi
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*/
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void hal_lld_init(void) {
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/* Reset of all peripherals.*/
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rccResetAHB(0xFFFFFFFF);
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rccResetAPB1(0xFFFFFFFF);
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rccResetAPB2(~RCC_APB2RSTR_DBGMCURST);
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/* PWR clock enabled.*/
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rccEnablePWRInterface(FALSE);
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/* Initializes the backup domain.*/
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hal_lld_backup_domain_init();
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#if defined(STM32_DMA_REQUIRED)
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dmaInit();
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#endif
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/* Programmable voltage detector enable.*/
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#if STM32_PVD_ENABLE
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PWR->CR |= PWR_CR_PVDE | (STM32_PLS & STM32_PLS_MASK);
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#endif /* STM32_PVD_ENABLE */
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}
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/**
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* @brief STM32 clocks and PLL initialization.
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* @note All the involved constants come from the file @p board.h.
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* @note This function should be invoked just after the system reset.
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*
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* @special
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*/
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void stm32_clock_init(void) {
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#if !STM32_NO_INIT
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/* HSI setup, it enforces the reset situation in order to handle possible
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problems with JTAG probes and re-initializations.*/
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RCC->CR |= RCC_CR_HSION; /* Make sure HSI is ON. */
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while (!(RCC->CR & RCC_CR_HSIRDY))
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; /* Wait until HSI is stable. */
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/* HSI is selected as new source without touching the other fields in
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CFGR. Clearing the register has to be postponed after HSI is the
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new source.*/
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RCC->CFGR &= ~RCC_CFGR_SW; /* Reset SW */
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RCC->CFGR |= RCC_CFGR_SWS_HSI; /* Select HSI as internal*/
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while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
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; /* Wait until HSI is selected. */
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/* Registers finally cleared to reset values.*/
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RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION; /* CR Reset value. */
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RCC->CFGR = 0; /* CFGR reset value. */
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#if STM32_HSE_ENABLED
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/* HSE activation.*/
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#if defined(STM32_HSE_BYPASS)
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/* HSE Bypass.*/
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RCC->CR |= RCC_CR_HSEON | RCC_CR_HSEBYP;
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#else
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/* No HSE Bypass.*/
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RCC->CR |= RCC_CR_HSEON;
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#endif
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while (!(RCC->CR & RCC_CR_HSERDY))
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; /* Waits until HSE is stable. */
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#endif
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#if STM32_HSI14_ENABLED
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/* HSI14 activation.*/
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RCC->CR2 |= RCC_CR2_HSI14ON;
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while (!(RCC->CR2 & RCC_CR2_HSI14RDY))
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; /* Waits until HSI14 is stable. */
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#endif
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#if STM32_HSI48_ENABLED
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/* HSI48 activation.*/
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RCC->CR2 |= RCC_CR2_HSI48ON;
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while (!(RCC->CR2 & RCC_CR2_HSI48RDY))
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; /* Waits until HSI48 is stable. */
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#endif
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#if STM32_LSI_ENABLED
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/* LSI activation.*/
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RCC->CSR |= RCC_CSR_LSION;
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while ((RCC->CSR & RCC_CSR_LSIRDY) == 0)
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; /* Waits until LSI is stable. */
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#endif
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/* Clock settings.*/
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RCC->CFGR = STM32_PLLNODIV | STM32_MCOPRE | STM32_MCOSEL | STM32_PLLMUL |
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STM32_PLLSRC | STM32_PPRE | STM32_HPRE;
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RCC->CFGR2 = STM32_PREDIV;
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#if STM32_CECSW == STM32_CECSW_OFF
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RCC->CFGR3 = STM32_USBSW | STM32_I2C1SW | STM32_USART1SW;
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#else
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RCC->CFGR3 = STM32_USBSW | STM32_CECSW | STM32_I2C1SW | STM32_USART1SW;
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#endif
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#if STM32_ACTIVATE_PLL
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/* PLL activation.*/
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RCC->CR |= RCC_CR_PLLON;
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while (!(RCC->CR & RCC_CR_PLLRDY))
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; /* Waits until PLL is stable. */
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#endif
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/* Flash setup and final clock selection. */
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FLASH->ACR = STM32_FLASHBITS;
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/* Switching to the configured clock source if it is different from HSI.*/
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#if (STM32_SW != STM32_SW_HSI)
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/* Switches clock source.*/
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RCC->CFGR |= STM32_SW;
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while ((RCC->CFGR & RCC_CFGR_SWS) != (STM32_SW << 2))
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; /* Waits selection complete. */
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#endif
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/* SYSCFG clock enabled here because it is a multi-functional unit shared
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among multiple drivers.*/
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rccEnableAPB2(RCC_APB2ENR_SYSCFGEN, TRUE);
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#endif /* !STM32_NO_INIT */
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}
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/** @} */
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