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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 LeafLabs, LLC.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*****************************************************************************/
/**
* @file bkp.h
* @brief Backup register support.
*/
#ifndef _BKP_H_
#define _BKP_H_
#ifdef __cplusplus
extern "C" {
#endif
#define BKP_BASE 0x40006C00
#define BKP_RTCCR (BKP_BASE + 0x2C)
#define BKP_CR (BKP_BASE + 0x30)
#define BKP_CSR (BKP_BASE + 0x34)
/**
* Initialize backup interface. This function enables the power and
* backup interface clocks. It does not enable write access to the
* backup registers.
*/
void bkp_init(void);
/** Disable power and backup interface clocks. */
void bkp_disable(void);
/**
* Enable write access to the backup registers. Backup interface must
* be initialized for subsequent register writes to work.
* @see bkp_init()
*/
void bkp_enable_writes(void);
/**
* Disable write access to the backup registers. Does not disable
* backup interface clocks.
*/
void bkp_disable_writes(void);
/**
* Read a value from given backup data register.
* @param reg Data register to read, from 1 to NR_BKP_REGS (10 on Maple).
*/
uint16 bkp_read(uint8 reg);
/**
* Write a value to given data register. Backup interface must have
* been previously initialized, and write access to backup registers
* must be enabled.
* @param reg Data register to write, from 1 to NR_BKP_REGS (10 on Maple).
* @param val Value to write into the register.
*/
void bkp_write(uint8 reg, uint16 val);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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