112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/*
|
|
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
|
|
2011,2012 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 */
|
|
}
|
|
|
|
/** @} */
|