107 lines
3.6 KiB
C
107 lines
3.6 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 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 STM8S/hal_lld.c
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* @brief STM8S 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 "ch.h"
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#include "hal.h"
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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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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/* Driver interrupt handlers. */
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/*===========================================================================*/
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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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* @details Clock sources initialization, HSI is assumed to be already
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* started after reset.
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* @note If the @p STM8S_CLOCK_INIT option is set to @p FALSE then the
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* initialization is not performed and is left to the application.
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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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#if !STM8S_NO_CLOCK_INIT
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/* Makes sure that HSI is stable before proceeding.*/
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CLK->ICKR |= CLK_ICKR_HSIEN;
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while ((CLK->ICKR & CLK_ICKR_HSIRDY) == 0)
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;
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/* LSI startup and stabilization if required.*/
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#if STM8S_LSI_ENABLED
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CLK->ICKR |= CLK_ICKR_LSIEN;
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while ((CLK->ICKR & CLK_ICKR_LSIRDY) == 0)
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;
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#endif
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/* HSE startup and stabilization if required.*/
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#if STM8S_HSE_ENABLED
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CLK->ECKR |= CLK_ECKR_HSEEN;
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while ((CLK->ECKR & CLK_ECKR_HSERDY) == 0)
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;
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#endif
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/* Setting up clock dividers.*/
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CLK->CKDIVR = (STM8S_HSI_DIVIDER << 3) | (STM8S_CPU_DIVIDER << 0);
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/* SYSCLK switch to the selected source, not necessary if it is HSI.*/
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#if STM8S_SYSCLK_SOURCE != CLK_SYSSEL_HSI
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/* Switching clock (manual switch mode).*/
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CLK->SWR = STM8S_SYSCLK_SOURCE;
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while ((CLK->SWCR & CLK_SWCR_SWIF) == 0)
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;
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CLK->SWCR = CLK_SWCR_SWEN;
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#endif
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/* Clocks initially all disabled.*/
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CLK->PCKENR1 = 0;
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CLK->PCKENR2 = 0;
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/* Other clock related initializations.*/
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CLK->CSSR = 0;
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CLK->CCOR = 0;
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/* HSI disabled if it is no more required.*/
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#if !STM8S_HSI_ENABLED
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CLK->ICKR &= ~CLK_ICKR_HSIEN;
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#endif
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#endif /* !STM8S_NO_CLOCK_INIT */
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}
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/** @} */
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