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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 STM8/hal_lld.c
* @brief STM8 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.
*
* @notapi
*/
void hal_lld_init(void) {
#if STM8_CLOCK_SOURCE != CLK_SOURCE_DEFAULT
#if STM8_CLOCK_SOURCE == CLK_SOURCE_HSI
CLK->ICKR = 1; /* HSIEN */
while ((CLK->ICKR & 2) == 0) /* HSIRDY */
;
#elif STM8_CLOCK_SOURCE == CLK_SOURCE_LSI
CLK->ICKR = 8; /* LSIEN */
while ((CLK->ICKR & 16) == 0) /* LSIRDY */
;
#else /* STM8_CLOCK_SOURCE == CLK_SOURCE_HSE */
CLK->ECKR = 1; /* HSEEN */
while ((CLK->ECKR & 2) == 0) /* HSERDY */
;
#endif
#if STM8_CLOCK_SOURCE != CLK_SOURCE_HSI
/* Switching clock (manual switch mode).*/
CLK->SWCR = 0;
CLK->SWR = STM8_CLOCK_SOURCE;
while ((CLK->SWCR & 8) == 0) /* SWIF */
;
CLK->SWCR = 2; /* SWEN */
#endif
/* Setting up clock dividers.*/
CLK->CKDIVR = (STM8_HSI_DIVIDER << 3) | (STM8_CPU_DIVIDER << 0);
/* Clocks initially all disabled.*/
CLK->PCKENR1 = 0;
CLK->PCKENR2 = 0;
/* Other clock related initializations.*/
CLK->CSSR = 0;
CLK->CCOR = 0;
CLK->CANCCR = 0;
#endif /* STM8_CLOCK_SOURCE != CLK_SOURCE_DEFAULT */
}
/** @} */
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