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