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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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/>.
*/
/**
* @file STM8S/hal_lld.c
* @brief STM8S HAL subsystem low level driver source.
*
* @addtogroup HAL
* @{
*/
#include "ch.h"
#include "hal.h"
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level HAL driver initialization.
* @details Clock sources initialization, HSI is assumed to be already
* started after reset.
* @note If the @p STM8S_CLOCK_INIT option is set to @p FALSE then the
* initialization is not performed and is left to the application.
*
* @notapi
*/
void hal_lld_init(void) {
#if !STM8S_NO_CLOCK_INIT
/* Makes sure that HSI is stable before proceeding.*/
CLK->ICKR |= CLK_ICKR_HSIRDY;
while ((CLK->ICKR & CLK_ICKR_HSIRDY) == 0)
;
/* LSI startup and stabilization if required.*/
#if STM8S_LSI_ENABLED
CLK->ICKR |= CLK_ICKR_LSIEN;
while ((CLK->ICKR & CLK_ICKR_LSIRDY) == 0)
;
#endif
/* HSE startup and stabilization if required.*/
#if STM8S_HSE_ENABLED
CLK->ECKR |= CLK_ECKR_HSEEN;
while ((CLK->ECKR & CLK_ECKR_HSERDY) == 0)
;
#endif
/* Setting up clock dividers.*/
CLK->CKDIVR = (STM8S_HSI_DIVIDER << 3) | (STM8S_CPU_DIVIDER << 0);
/* SYSCLK switch to the selected source, not necessary if it is HSI.*/
#if STM8S_SYSCLK_SOURCE != CLK_SYSSEL_HSI
/* Switching clock (manual switch mode).*/
CLK->SWR = STM8S_SYSCLK_SOURCE;
while ((CLK->SWCR & CLK_SWCR_SWIF) == 0)
;
CLK->SWCR = CLK_SWCR_SWEN;
#endif
/* Clocks initially all disabled.*/
CLK->PCKENR1 = 0;
CLK->PCKENR2 = 0;
/* Other clock related initializations.*/
CLK->CSSR = 0;
CLK->CCOR = 0;
CLK->CANCCR = STM8S_CAN_DIVIDER_VALUE;
/* HSI disabled if it is no more required.*/
#if !STM8S_HSI_ENABLED
CLK->ICKR &= ~CLK_ICKR_HSIEN;
#endif
#endif /* !STM8S_NO_CLOCK_INIT */
}
/** @} */
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