70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
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/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2010 LeafLabs, LLC.
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* Copyright (c) 2013 OpenMusicKontrollers.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*****************************************************************************/
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/**
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* @file libmaple/bkp.c
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* @author F3-port by Hanspeter Portner <dev@open-music-kontrollers.ch>
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* @brief Backup register support (STM32F1 & STM32F3 only).
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*/
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#include <libmaple/pwr.h>
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#include <libmaple/bkp.h>
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#include <libmaple/bitband.h>
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bkp_dev bkp = {
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.regs = BKP_BASE,
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};
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/** Backup device. */
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const bkp_dev *BKP = &bkp;
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void bkp_enable_writes(void) {
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*bb_perip(&PWR_BASE->CR, PWR_CR_DBP_BIT) = 1;
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}
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void bkp_disable_writes(void) {
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*bb_perip(&PWR_BASE->CR, PWR_CR_DBP_BIT) = 0;
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}
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uint16 bkp_read(uint8 reg) {
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__io uint32* dr = bkp_data_register(reg);
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if (!dr) {
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ASSERT(0); /* nonexistent register */
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return 0;
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}
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return (uint16)*dr;
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}
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void bkp_write(uint8 reg, uint16 val) {
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__io uint32* dr = bkp_data_register(reg);
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if (!dr) {
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ASSERT(0); /* nonexistent register */
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return;
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}
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*dr = (uint32)val;
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}
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