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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file STM32L0xx/hal_lld.c
* @brief STM32L0xx HAL subsystem low level driver source.
*
* @addtogroup HAL
* @{
*/
#include "hal.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief CMSIS system core clock variable.
* @note It is declared in system_stm32l0xx.h.
*/
uint32_t SystemCoreClock = STM32_HCLK;
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Initializes the backup 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->CSR & STM32_RTCSEL_MASK) != STM32_RTCSEL){
/* Backup domain reset.*/
RCC->CSR |= RCC_CSR_RTCRST;
RCC->CSR &= ~RCC_CSR_RTCRST;
}
/* If enabled then the LSE is started.*/
#if STM32_LSE_ENABLED
RCC->CSR |= RCC_CSR_LSEON;
while ((RCC->CSR & RCC_CSR_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->CSR & RCC_CSR_RTCEN) == 0) {
/* Selects clock source.*/
RCC->CSR |= STM32_RTCSEL;
/* RTC clock enabled.*/
RCC->CSR |= RCC_CSR_RTCEN;
}
#endif /* STM32_RTCSEL != STM32_RTCSEL_NOCLOCK */
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if defined(STM32_DMA_REQUIRED) || defined(__DOXYGEN__)
#if defined(STM32_DMA1_CH23_HANDLER) || defined(__DOXYGEN__)
/**
* @brief DMA1 streams 2 and 3 shared ISR.
* @note It is declared here because this device has a non-standard
* DMA shared IRQ handler.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_DMA1_CH23_HANDLER) {
OSAL_IRQ_PROLOGUE();
/* Check on channel 2.*/
dmaServeInterrupt(STM32_DMA1_STREAM2);
/* Check on channel 3.*/
dmaServeInterrupt(STM32_DMA1_STREAM3);
OSAL_IRQ_EPILOGUE();
}
#endif /* defined(STM32_DMA1_CH23_HANDLER) */
#if defined(STM32_DMA1_CH4567_HANDLER) || defined(__DOXYGEN__)
/**
* @brief DMA1 streams 4, 5, 6 and 7 shared ISR.
*
* @isr
*/
OSAL_IRQ_HANDLER(STM32_DMA1_CH4567_HANDLER) {
OSAL_IRQ_PROLOGUE();
/* Check on channel 4.*/
dmaServeInterrupt(STM32_DMA1_STREAM4);
/* Check on channel 5.*/
dmaServeInterrupt(STM32_DMA1_STREAM5);
#if STM32_DMA1_NUM_CHANNELS > 5
/* Check on channel 6.*/
dmaServeInterrupt(STM32_DMA1_STREAM6);
#endif
#if STM32_DMA1_NUM_CHANNELS > 6
/* Check on channel 7.*/
dmaServeInterrupt(STM32_DMA1_STREAM7);
#endif
OSAL_IRQ_EPILOGUE();
}
#endif /* defined(STM32_DMA1_CH4567_HANDLER) */
#endif /* defined(STM32_DMA_REQUIRED) */
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level HAL driver initialization.
*
* @notapi
*/
void hal_lld_init(void) {
/* Reset of all peripherals except those on IOP.*/
rccResetAHB(~RCC_AHBRSTR_MIFRST);
rccResetAPB1(~RCC_APB1RSTR_PWRRST);
rccResetAPB2(~0);
/* PWR clock enabled.*/
rccEnablePWRInterface(true);
/* Initializes the backup domain.*/
hal_lld_backup_domain_init();
/* DMA subsystems initialization.*/
#if defined(STM32_DMA_REQUIRED)
dmaInit();
#endif
/* IRQ subsystem initialization.*/
irqInit();
/* Programmable voltage detector enable.*/
#if STM32_PVD_ENABLE
PWR->CR |= PWR_CR_PVDE | (STM32_PLS & STM32_PLS_MASK);
#endif /* STM32_PVD_ENABLE */
}
/**
* @brief STM32L0xx voltage, 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
*/
/**
* @brief Clocks and internal voltage initialization.
*/
void stm32_clock_init(void) {
#if !STM32_NO_INIT
/* PWR clock enable.*/
RCC->APB1ENR = RCC_APB1ENR_PWREN;
/* Core voltage setup.*/
while ((PWR->CSR & PWR_CSR_VOSF) != 0)
; /* Waits until regulator is stable. */
PWR->CR = STM32_VOS;
while ((PWR->CSR & PWR_CSR_VOSF) != 0)
; /* Waits until regulator is stable. */
/* Initial clocks setup and wait for MSI stabilization, the MSI clock is
always enabled because it is the fallback clock when PLL the fails.
Trim fields are not altered from reset values.*/
RCC->CFGR = 0;
RCC->ICSCR = (RCC->ICSCR & ~STM32_MSIRANGE_MASK) | STM32_MSIRANGE;
RCC->CR = RCC_CR_MSION;
while ((RCC->CR & RCC_CR_MSIRDY) == 0)
; /* Waits until MSI is stable. */
#if STM32_HSI16_ENABLED
/* HSI activation.*/
RCC->CR |= RCC_CR_HSION;
while ((RCC->CR & RCC_CR_HSIRDY) == 0)
; /* Waits until HSI16 is stable. */
#if STM32_HSI16_DIVIDER_ENABLED
RCC->CR |= RCC_CR_HSIDIVEN;
while ((RCC->CR & RCC_CR_HSIDIVF) == 0)
;
#endif
#endif
#if STM32_HSE_ENABLED
#if defined(STM32_HSE_BYPASS)
/* HSE Bypass.*/
RCC->CR |= RCC_CR_HSEON | RCC_CR_HSEBYP;
#endif
/* HSE activation.*/
RCC->CR |= RCC_CR_HSEON;
while ((RCC->CR & RCC_CR_HSERDY) == 0)
; /* 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_LSE_ENABLED
/* LSE activation, have to unlock the register.*/
if ((RCC->CSR & RCC_CSR_LSEON) == 0) {
PWR->CR |= PWR_CR_DBP;
#if defined(STM32_LSE_BYPASS)
/* LSE Bypass.*/
RCC->CSR |= STM32_LSEDRV | RCC_CSR_LSEBYP;
#else
/* No LSE Bypass.*/
RCC->CSR |= STM32_LSEDRV;
#endif
RCC->CSR |= RCC_CSR_LSEON;
PWR->CR &= ~PWR_CR_DBP;
}
while ((RCC->CSR & RCC_CSR_LSERDY) == 0)
; /* Waits until LSE is stable. */
#endif
#if STM32_ACTIVATE_PLL
/* PLL activation.*/
RCC->CFGR |= STM32_PLLDIV | STM32_PLLMUL | STM32_PLLSRC;
RCC->CR |= RCC_CR_PLLON;
while (!(RCC->CR & RCC_CR_PLLRDY))
; /* Waits until PLL is stable. */
#endif
#if STM32_ACTIVATE_HSI48
/* Enabling SYSCFG clock. */
rccEnableAPB2(RCC_APB2ENR_SYSCFGEN, true);
/* Configuring SYSCFG to enable VREFINT and HSI48 VREFINT buffer. */
SYSCFG->CFGR3 = STM32_VREFINT_EN | SYSCFG_CFGR3_ENREF_HSI48;
while (!(SYSCFG->CFGR3 & SYSCFG_CFGR3_VREFINT_RDYF))
; /* Waits until VREFINT is stable. */
/* Disabling SYSCFG clock. */
rccDisableAPB2(RCC_APB2ENR_SYSCFGEN);
/* Enabling HSI48. */
RCC->CRRCR |= RCC_CRRCR_HSI48ON;
while (!(RCC->CRRCR & RCC_CRRCR_HSI48RDY))
; /* Waits until HSI48 is stable. */
#endif
/* Other clock-related settings (dividers, MCO etc).*/
RCC->CR |= STM32_RTCPRE;
RCC->CFGR |= STM32_MCOPRE | STM32_MCOSEL |
STM32_PPRE2 | STM32_PPRE1 | STM32_HPRE;
RCC->CSR |= STM32_RTCSEL;
/* Flash setup and final clock selection.*/
#if defined(STM32_FLASHBITS)
FLASH->ACR = STM32_FLASHBITS;
#endif
/* Switching to the configured clock source if it is different from MSI. */
#if (STM32_SW != STM32_SW_MSI)
RCC->CFGR |= STM32_SW; /* Switches on the selected clock source. */
while ((RCC->CFGR & RCC_CFGR_SWS) != (STM32_SW << 2))
;
#endif
/* Peripherals clock sources setup.*/
RCC->CCIPR = STM32_HSI48SEL | STM32_LPTIM1SEL | STM32_I2C1SEL |
STM32_LPUART1SEL | STM32_USART2SEL | STM32_USART1SEL;
/* SYSCFG clock enabled here because it is a multi-functional unit shared
among multiple drivers.*/
rccEnableAPB2(RCC_APB2ENR_SYSCFGEN, true);
#endif /* STM32_NO_INIT */
}
/** @} */
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