129 lines
4.4 KiB
C
129 lines
4.4 KiB
C
/******************************************************************************
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* The MIT License
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*
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* Copyright (c) 2011 LeafLabs, LLC.
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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/include/libmaple/bitband.h
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*
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* @brief Bit-banding utility functions
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*/
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#ifndef _LIBMAPLE_BITBAND_H_
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#define _LIBMAPLE_BITBAND_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <libmaple/libmaple_types.h>
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#define BB_SRAM_REF 0x20000000
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#define BB_SRAM_BASE 0x22000000
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#define BB_PERI_REF 0x40000000
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#define BB_PERI_BASE 0x42000000
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static inline volatile uint32* __bb_addr(volatile void*,
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uint32,
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uint32,
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uint32);
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/**
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* @brief Obtain a pointer to the bit-band address corresponding to a
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* bit in a volatile SRAM address.
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* @param address Address in the bit-banded SRAM region
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* @param bit Bit in address to bit-band
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*/
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static inline volatile uint32* bb_sramp(volatile void *address, uint32 bit) {
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return __bb_addr(address, bit, BB_SRAM_BASE, BB_SRAM_REF);
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}
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/**
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* @brief Get a bit from an address in the SRAM bit-band region.
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* @param address Address in the SRAM bit-band region to read from
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* @param bit Bit in address to read
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* @return bit's value in address.
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*/
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static inline uint8 bb_sram_get_bit(volatile void *address, uint32 bit) {
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return *bb_sramp(address, bit);
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}
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/**
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* @brief Set a bit in an address in the SRAM bit-band region.
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* @param address Address in the SRAM bit-band region to write to
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* @param bit Bit in address to write to
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* @param val Value to write for bit, either 0 or 1.
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*/
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static inline void bb_sram_set_bit(volatile void *address,
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uint32 bit,
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uint8 val) {
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*bb_sramp(address, bit) = val;
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}
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/**
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* @brief Obtain a pointer to the bit-band address corresponding to a
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* bit in a peripheral address.
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* @param address Address in the bit-banded peripheral region
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* @param bit Bit in address to bit-band
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*/
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static inline volatile uint32* bb_perip(volatile void *address, uint32 bit) {
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return __bb_addr(address, bit, BB_PERI_BASE, BB_PERI_REF);
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}
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/**
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* @brief Get a bit from an address in the peripheral bit-band region.
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* @param address Address in the peripheral bit-band region to read from
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* @param bit Bit in address to read
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* @return bit's value in address.
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*/
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static inline uint8 bb_peri_get_bit(volatile void *address, uint32 bit) {
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return *bb_perip(address, bit);
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}
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/**
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* @brief Set a bit in an address in the peripheral bit-band region.
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* @param address Address in the peripheral bit-band region to write to
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* @param bit Bit in address to write to
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* @param val Value to write for bit, either 0 or 1.
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*/
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static inline void bb_peri_set_bit(volatile void *address,
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uint32 bit,
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uint8 val) {
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*bb_perip(address, bit) = val;
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}
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static inline volatile uint32* __bb_addr(volatile void *address,
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uint32 bit,
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uint32 bb_base,
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uint32 bb_ref) {
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return (volatile uint32*)(bb_base + ((uint32)address - bb_ref) * 32 +
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bit * 4);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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