hal_lld.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file STM32F1xx/hal_lld.c
* @brief STM32F1xx HAL subsystem low level driver source.
*
* @addtogroup HAL
* @{
*/
#include "ch.h"
#include "hal.h"
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Initializes the backup domain.
* @note WARNING! Changing clock source impossible without resetting
* of the whole BKP domain.
*/
static void hal_lld_backup_domain_init(void) {
/* Backup domain access enabled and left open.*/
PWR->CR |= PWR_CR_DBP;
/* Reset BKP domain if different clock source selected.*/
if ((RCC->BDCR & STM32_RTCSEL_MASK) != STM32_RTCSEL){
/* Backup domain reset.*/
RCC->BDCR = RCC_BDCR_BDRST;
RCC->BDCR = 0;
}
/* If enabled then the LSE is started.*/
#if STM32_LSE_ENABLED
RCC->BDCR |= RCC_BDCR_LSEON;
while ((RCC->BDCR & RCC_BDCR_LSERDY) == 0)
; /* Waits until LSE is stable. */
#endif
#if STM32_RTCSEL != STM32_RTCSEL_NOCLOCK
/* If the backup domain hasn't been initialized yet then proceed with
initialization.*/
if ((RCC->BDCR & RCC_BDCR_RTCEN) == 0) {
/* Selects clock source.*/
RCC->BDCR |= STM32_RTCSEL;
/* RTC clock enabled.*/
RCC->BDCR |= RCC_BDCR_RTCEN;
}
#endif /* STM32_RTCSEL != STM32_RTCSEL_NOCLOCK */
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level HAL driver initialization.
*
* @notapi
*/
void hal_lld_init(void) {
/* Reset of all peripherals.*/
rccResetAPB1(0xFFFFFFFF);
rccResetAPB2(0xFFFFFFFF);
/* SysTick initialization using the system clock.*/
SysTick->LOAD = STM32_HCLK / CH_FREQUENCY - 1;
SysTick->VAL = 0;
SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
SysTick_CTRL_ENABLE_Msk |
SysTick_CTRL_TICKINT_Msk;
/* DWT cycle counter enable.*/
SCS_DEMCR |= SCS_DEMCR_TRCENA;
DWT_CTRL |= DWT_CTRL_CYCCNTENA;
/* PWR and BD clocks enabled.*/
rccEnablePWRInterface(FALSE);
rccEnableBKPInterface(FALSE);
/* Initializes the backup domain.*/
hal_lld_backup_domain_init();
#if defined(STM32_DMA_REQUIRED)
dmaInit();
#endif
/* Programmable voltage detector enable.*/
#if STM32_PVD_ENABLE
PWR->CR |= PWR_CR_PVDE | (STM32_PLS & STM32_PLS_MASK);
#endif /* STM32_PVD_ENABLE */
}
/**
* @brief STM32 clocks and PLL initialization.
* @note All the involved constants come from the file @p board.h.
* @note This function should be invoked just after the system reset.
*
* @special
*/
#if defined(STM32F10X_LD) || defined(STM32F10X_LD_VL) || \
defined(STM32F10X_MD) || defined(STM32F10X_MD_VL) || \
defined(STM32F10X_HD) || defined(STM32F10X_XL) || \
defined(__DOXYGEN__)
/*
* Clocks initialization for all sub-families except CL.
*/
void stm32_clock_init(void) {
#if !STM32_NO_INIT
/* HSI setup, it enforces the reset situation in order to handle possible
problems with JTAG probes and re-initializations.*/
RCC->CR |= RCC_CR_HSION; /* Make sure HSI is ON. */
while (!(RCC->CR & RCC_CR_HSIRDY))
; /* Wait until HSI is stable. */
RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION; /* CR Reset value. */
RCC->CFGR = 0; /* CFGR reset value. */
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
; /* Waits until HSI is selected. */
#if STM32_HSE_ENABLED
/* HSE activation.*/
RCC->CR |= RCC_CR_HSEON;
while (!(RCC->CR & RCC_CR_HSERDY))
; /* Waits until HSE is stable. */
#endif
#if STM32_LSI_ENABLED
/* LSI activation.*/
RCC->CSR |= RCC_CSR_LSION;
while ((RCC->CSR & RCC_CSR_LSIRDY) == 0)
; /* Waits until LSI is stable. */
#endif
#if STM32_ACTIVATE_PLL
/* PLL activation.*/
RCC->CFGR |= STM32_PLLMUL | STM32_PLLXTPRE | STM32_PLLSRC;
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR & RCC_CR_PLLRDY))
; /* Waits until PLL is stable. */
#endif
/* Clock settings.*/
#if STM32_HAS_USB
RCC->CFGR = STM32_MCOSEL | STM32_USBPRE | STM32_PLLMUL | STM32_PLLXTPRE |
STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 |
STM32_HPRE;
#else
RCC->CFGR = STM32_MCOSEL | STM32_PLLMUL | STM32_PLLXTPRE |
STM32_PLLSRC | STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 |
STM32_HPRE;
#endif
/* Flash setup and final clock selection. */
FLASH->ACR = STM32_FLASHBITS;
/* Switching to the configured clock source if it is different from HSI.*/
#if (STM32_SW != STM32_SW_HSI)
/* Switches clock source.*/
RCC->CFGR |= STM32_SW;
while ((RCC->CFGR & RCC_CFGR_SWS) != (STM32_SW << 2))
; /* Waits selection complete. */
#endif
#endif /* !STM32_NO_INIT */
}
#elif defined(STM32F10X_CL)
/*
* Clocks initialization for the CL sub-family.
*/
void stm32_clock_init(void) {
#if !STM32_NO_INIT
/* HSI setup.*/
RCC->CR |= RCC_CR_HSION; /* Make sure HSI is ON. */
while (!(RCC->CR & RCC_CR_HSIRDY))
; /* Wait until HSI is stable. */
RCC->CFGR = 0;
RCC->CR &= RCC_CR_HSITRIM | RCC_CR_HSION; /* CR Reset value. */
while ((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_HSI)
; /* Wait until HSI is the source.*/
#if STM32_HSE_ENABLED
/* HSE activation.*/
RCC->CR |= RCC_CR_HSEON;
while (!(RCC->CR & RCC_CR_HSERDY))
; /* Waits until HSE is stable. */
#endif
#if STM32_LSI_ENABLED
/* LSI activation.*/
RCC->CSR |= RCC_CSR_LSION;
while ((RCC->CSR & RCC_CSR_LSIRDY) == 0)
; /* Waits until LSI is stable. */
#endif
/* Settings of various dividers and multipliers in CFGR2.*/
RCC->CFGR2 = STM32_PLL3MUL | STM32_PLL2MUL | STM32_PREDIV2 |
STM32_PREDIV1 | STM32_PREDIV1SRC;
/* PLL2 setup, if activated.*/
#if STM32_ACTIVATE_PLL2
RCC->CR |= RCC_CR_PLL2ON;
while (!(RCC->CR & RCC_CR_PLL2RDY))
; /* Waits until PLL2 is stable. */
#endif
/* PLL3 setup, if activated.*/
#if STM32_ACTIVATE_PLL3
RCC->CR |= RCC_CR_PLL3ON;
while (!(RCC->CR & RCC_CR_PLL3RDY))
; /* Waits until PLL3 is stable. */
#endif
/* PLL1 setup, if activated.*/
#if STM32_ACTIVATE_PLL1
RCC->CFGR |= STM32_PLLMUL | STM32_PLLSRC;
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR & RCC_CR_PLLRDY))
; /* Waits until PLL1 is stable. */
#endif
/* Clock settings.*/
#if STM32_HAS_OTG1
RCC->CFGR = STM32_MCOSEL | STM32_OTGFSPRE | STM32_PLLMUL | STM32_PLLSRC |
STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
#else
RCC->CFGR = STM32_MCO | STM32_PLLMUL | STM32_PLLSRC |
STM32_ADCPRE | STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
#endif
/* Flash setup and final clock selection. */
FLASH->ACR = STM32_FLASHBITS; /* Flash wait states depending on clock. */
/* Switching to the configured clock source if it is different from HSI.*/
#if (STM32_SW != STM32_SW_HSI)
RCC->CFGR |= STM32_SW; /* Switches on the selected clock source. */
while ((RCC->CFGR & RCC_CFGR_SWS) != (STM32_SW << 2))
;
#endif
#endif /* !STM32_NO_INIT */
}
#else
void stm32_clock_init(void) {}
#endif
/** @} */