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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2013 Frantisek Burian <bufran@seznam.cz>
* .. file is merged from many other copyrighted files of stm32 family
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
/**@{*/
#include <libopencm3/stm32/rcc.h>
/*---------------------------------------------------------------------------*/
/** @brief RCC Enable Peripheral Clocks.
*
* Enable the clock on particular peripherals. There are three registers
* involved, each one controlling the enabling of clocks associated with the
* AHB, APB1 and APB2 respectively. Several peripherals could be enabled
* simultaneously <em>only if they are controlled by the same register</em>.
*
* @param[in] *reg Unsigned int32. Pointer to a Clock Enable Register
* (either RCC_AHBENR, RCC_APB1ENR or RCC_APB2ENR)
*
* @param[in] en Unsigned int32. Logical OR of all enables to be set
* @li If register is RCC_AHBER, from @ref rcc_ahbenr_en
* @li If register is RCC_APB1ENR, from @ref rcc_apb1enr_en
* @li If register is RCC_APB2ENR, from @ref rcc_apb2enr_en
*/
void rcc_peripheral_enable_clock(volatile uint32_t *reg, uint32_t en)
{
*reg |= en;
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Disable Peripheral Clocks.
*
* Enable the clock on particular peripherals. There are three registers
* involved, each one controlling the enabling of clocks associated with
* the AHB, APB1 and APB2 respectively. Several peripherals could be disabled
* simultaneously <em>only if they are controlled by the same register</em>.
*
* @param[in] *reg Unsigned int32. Pointer to a Clock Enable Register
* (either RCC_AHBENR, RCC_APB1ENR or RCC_APB2ENR)
* @param[in] en Unsigned int32. Logical OR of all enables to be used for
* disabling.
* @li If register is RCC_AHBER, from @ref rcc_ahbenr_en
* @li If register is RCC_APB1ENR, from @ref rcc_apb1enr_en
* @li If register is RCC_APB2ENR, from @ref rcc_apb2enr_en
*/
void rcc_peripheral_disable_clock(volatile uint32_t *reg, uint32_t en)
{
*reg &= ~en;
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Reset Peripherals.
*
* Reset particular peripherals. There are three registers involved, each one
* controlling reset of peripherals associated with the AHB, APB1 and APB2
* respectively. Several peripherals could be reset simultaneously <em>only if
* they are controlled by the same register</em>.
*
* @param[in] *reg Unsigned int32. Pointer to a Reset Register
* (either RCC_AHBENR, RCC_APB1ENR or RCC_APB2ENR)
* @param[in] reset Unsigned int32. Logical OR of all resets.
* @li If register is RCC_AHBRSTR, from @ref rcc_ahbrstr_rst
* @li If register is RCC_APB1RSTR, from @ref rcc_apb1rstr_rst
* @li If register is RCC_APB2RSTR, from @ref rcc_apb2rstr_rst
*/
void rcc_peripheral_reset(volatile uint32_t *reg, uint32_t reset)
{
*reg |= reset;
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Remove Reset on Peripherals.
*
* Remove the reset on particular peripherals. There are three registers
* involved, each one controlling reset of peripherals associated with the AHB,
* APB1 and APB2 respectively. Several peripherals could have the reset removed
* simultaneously <em>only if they are controlled by the same register</em>.
*
* @param[in] *reg Unsigned int32. Pointer to a Reset Register
* (either RCC_AHBENR, RCC_APB1ENR or RCC_APB2ENR)
* @param[in] clear_reset Unsigned int32. Logical OR of all resets to be
* removed:
* @li If register is RCC_AHBRSTR, from @ref rcc_ahbrstr_rst
* @li If register is RCC_APB1RSTR, from @ref rcc_apb1rstr_rst
* @li If register is RCC_APB2RSTR, from @ref rcc_apb2rstr_rst
*/
void rcc_peripheral_clear_reset(volatile uint32_t *reg, uint32_t clear_reset)
{
*reg &= ~clear_reset;
}
#define _RCC_REG(i) MMIO32(RCC_BASE + ((i) >> 5))
#define _RCC_BIT(i) (1 << ((i) & 0x1f))
/*---------------------------------------------------------------------------*/
/** @brief Enable Peripheral Clock in running mode.
*
* Enable the clock on particular peripheral.
*
* @param[in] clken rcc_periph_clken Peripheral RCC
*
* For available constants, see #rcc_periph_clken (RCC_UART1 for example)
*/
void rcc_periph_clock_enable(enum rcc_periph_clken clken)
{
_RCC_REG(clken) |= _RCC_BIT(clken);
}
/*---------------------------------------------------------------------------*/
/** @brief Disable Peripheral Clock in running mode.
* Disable the clock on particular peripheral.
*
* @param[in] clken rcc_periph_clken Peripheral RCC
*
* For available constants, see #rcc_periph_clken (RCC_UART1 for example)
*/
void rcc_periph_clock_disable(enum rcc_periph_clken clken)
{
_RCC_REG(clken) &= ~_RCC_BIT(clken);
}
/*---------------------------------------------------------------------------*/
/** @brief Reset Peripheral, pulsed
*
* Reset particular peripheral, and restore to working state.
*
* @param[in] rst rcc_periph_rst Peripheral reset
*
* For available constants, see #rcc_periph_rst (RST_UART1 for example)
*/
void rcc_periph_reset_pulse(enum rcc_periph_rst rst)
{
_RCC_REG(rst) |= _RCC_BIT(rst);
_RCC_REG(rst) &= ~_RCC_BIT(rst);
}
/*---------------------------------------------------------------------------*/
/** @brief Reset Peripheral, hold
*
* Reset particular peripheral, and hold in reset state.
*
* @param[in] rst rcc_periph_rst Peripheral reset
*
* For available constants, see #rcc_periph_rst (RST_UART1 for example)
*/
void rcc_periph_reset_hold(enum rcc_periph_rst rst)
{
_RCC_REG(rst) |= _RCC_BIT(rst);
}
/*---------------------------------------------------------------------------*/
/** @brief Reset Peripheral, release
*
* Restore peripheral from reset state to working state.
*
* @param[in] rst rcc_periph_rst Peripheral reset
*
* For available constants, see #rcc_periph_rst (RST_UART1 for example)
*/
void rcc_periph_reset_release(enum rcc_periph_rst rst)
{
_RCC_REG(rst) &= ~_RCC_BIT(rst);
}
/**@}*/
#undef _RCC_REG
#undef _RCC_BIT
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