95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file STM8/hal_lld.c
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* @brief STM8 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. */
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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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*
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* @notapi
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*/
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void hal_lld_init(void) {
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#if STM8_CLOCK_SOURCE != CLK_SOURCE_DEFAULT
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#if STM8_CLOCK_SOURCE == CLK_SOURCE_HSI
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CLK->ICKR = 1; /* HSIEN */
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while ((CLK->ICKR & 2) == 0) /* HSIRDY */
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;
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#elif STM8_CLOCK_SOURCE == CLK_SOURCE_LSI
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CLK->ICKR = 8; /* LSIEN */
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while ((CLK->ICKR & 16) == 0) /* LSIRDY */
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;
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#else /* STM8_CLOCK_SOURCE == CLK_SOURCE_HSE */
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CLK->ECKR = 1; /* HSEEN */
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while ((CLK->ECKR & 2) == 0) /* HSERDY */
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;
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#endif
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#if STM8_CLOCK_SOURCE != CLK_SOURCE_HSI
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/* Switching clock (manual switch mode).*/
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CLK->SWCR = 0;
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CLK->SWR = STM8_CLOCK_SOURCE;
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while ((CLK->SWCR & 8) == 0) /* SWIF */
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;
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CLK->SWCR = 2; /* SWEN */
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#endif
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/* Setting up clock dividers.*/
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CLK->CKDIVR = (STM8_HSI_DIVIDER << 3) | (STM8_CPU_DIVIDER << 0);
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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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CLK->CANCCR = 0;
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#endif /* STM8_CLOCK_SOURCE != CLK_SOURCE_DEFAULT */
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}
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/** @} */
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