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Bitband library, factored out of other code.

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This commit is contained in:
Jared Boone
2012-07-31 22:07:08 -07:00
parent 2a6e3a89d3
commit 9f4f1d0b6b
2 changed files with 77 additions and 0 deletions
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45
firmware/common/bitband.c Normal file
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/*
* Copyright 2012 Jared Boone
*
* This file is part of HackRF.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "bitband.h"
volatile uint_fast8_t* peripheral_bitband_address(volatile void* const address, const uint_fast8_t bit_number) {
const uint32_t bit_band_base = 0x42000000;
const uint32_t byte_offset = (uint32_t)address - 0x40000000;
const uint32_t bit_word_offset = (byte_offset * 32) + (bit_number * 4);
const uint32_t bit_word_address = bit_band_base + bit_word_offset;
return (volatile uint_fast8_t*)bit_word_address;
}
void peripheral_bitband_set(volatile void* const peripheral_address, const uint_fast8_t bit_number) {
volatile uint_fast8_t* const bitband_address = peripheral_bitband_address(peripheral_address, bit_number);
*bitband_address = 1;
}
void peripheral_bitband_clear(volatile void* const peripheral_address, const uint_fast8_t bit_number) {
volatile uint_fast8_t* const bitband_address = peripheral_bitband_address(peripheral_address, bit_number);
*bitband_address = 0;
}
uint_fast8_t peripheral_bitband_get(volatile void* const peripheral_address, const uint_fast8_t bit_number) {
volatile uint_fast8_t* const bitband_address = peripheral_bitband_address(peripheral_address, bit_number);
return *bitband_address;
}

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firmware/common/bitband.h Normal file
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/*
* Copyright 2012 Jared Boone
*
* This file is part of HackRF.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef __BITBAND_H__
#define __BITBAND_H__
#include <stdint.h>
volatile uint_fast8_t* peripheral_bitband_address(volatile void* const address, const uint_fast8_t bit_number);
void peripheral_bitband_set(volatile void* const peripheral_address, const uint_fast8_t bit_number);
void peripheral_bitband_clear(volatile void* const peripheral_address, const uint_fast8_t bit_number);
uint_fast8_t peripheral_bitband_get(volatile void* const peripheral_address, const uint_fast8_t bit_number);
#endif//__BITBAND_H__