110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
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/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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 "rffc507x_spi.hpp"
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#include "utility.hpp"
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#include "hackrf_gpio.hpp"
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using namespace hackrf::one;
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namespace rffc507x {
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namespace spi {
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void SPI::init() {
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gpio_rffc5072_select.set();
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gpio_rffc5072_clock.clear();
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gpio_rffc5072_select.output();
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gpio_rffc5072_clock.output();
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gpio_rffc5072_data.input();
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gpio_rffc5072_data.clear();
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}
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inline void SPI::select(const bool active) {
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gpio_rffc5072_select.write(!active);
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}
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inline void SPI::direction_out() {
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gpio_rffc5072_data.output();
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}
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inline void SPI::direction_in() {
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gpio_rffc5072_data.input();
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}
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inline void SPI::write_bit(const bit_t value) {
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gpio_rffc5072_data.write(value);
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}
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inline bit_t SPI::read_bit() {
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return gpio_rffc5072_data.read() & 1;
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}
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inline bit_t SPI::transfer_bit(const bit_t bit_out) {
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gpio_rffc5072_clock.clear();
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write_bit(bit_out);
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const bit_t bit_in = read_bit();
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gpio_rffc5072_clock.set();
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return bit_in;
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}
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data_t SPI::transfer_bits(const data_t data_out, const size_t count) {
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data_t data_in = 0;
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for(size_t i=0; i<count; i++) {
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data_in = (data_in << 1) | transfer_bit((data_out >> (count - i - 1)) & 1);
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}
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return data_in;
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}
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data_t SPI::transfer_word(const Direction direction, const address_t address, const data_t data_out) {
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select(true);
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const data_t address_word =
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((direction == Direction::Read) ? (1 << 7) : 0)
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| (address & 0x7f)
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;
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direction_out();
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transfer_bits(address_word, 9);
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if( direction == Direction::Read ) {
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direction_in();
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transfer_bits(0, 2);
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}
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const data_t data_in = transfer_bits(data_out, 16);
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if( direction == Direction::Write ) {
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direction_in();
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}
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select(false);
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transfer_bits(0, 2);
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return data_in;
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}
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}
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}
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