46 lines
1.9 KiB
C
46 lines
1.9 KiB
C
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/*
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* Copyright 2012 Jared Boone <jared@sharebrained.com>
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*
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* This file is part of HackRF.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "bitband.h"
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volatile uint32_t* peripheral_bitband_address(volatile void* const address, const uint_fast8_t bit_number) {
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const uint32_t bit_band_base = 0x42000000;
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const uint32_t byte_offset = (uint32_t)address - 0x40000000;
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const uint32_t bit_word_offset = (byte_offset * 32) + (bit_number * 4);
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const uint32_t bit_word_address = bit_band_base + bit_word_offset;
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return (volatile uint32_t*)bit_word_address;
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}
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void peripheral_bitband_set(volatile void* const peripheral_address, const uint_fast8_t bit_number) {
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volatile uint32_t* const bitband_address = peripheral_bitband_address(peripheral_address, bit_number);
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*bitband_address = 1;
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}
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void peripheral_bitband_clear(volatile void* const peripheral_address, const uint_fast8_t bit_number) {
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volatile uint32_t* const bitband_address = peripheral_bitband_address(peripheral_address, bit_number);
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*bitband_address = 0;
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}
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uint32_t peripheral_bitband_get(volatile void* const peripheral_address, const uint_fast8_t bit_number) {
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volatile uint32_t* const bitband_address = peripheral_bitband_address(peripheral_address, bit_number);
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return *bitband_address;
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}
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