120 lines
2.9 KiB
C++
120 lines
2.9 KiB
C++
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/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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* Copyright (C) 2016 Furrtek
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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 "modems.hpp"
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#include "serializer.hpp"
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#include "portapack_persistent_memory.hpp"
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using namespace portapack;
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namespace modems {
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void generate_data(const std::string& in_message, uint16_t * out_data) {
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uint8_t parity_init, parity, bits, bit, cur_byte;
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uint16_t ordered_word;
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size_t bytes;
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serial_format_t serial_format = persistent_memory::serial_format();
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size_t message_length = in_message.length();
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if (serial_format.parity == ODD)
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parity_init = 1;
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else
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parity_init = 0;
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uint8_t data_bits = serial_format.data_bits;
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for (bytes = 0; bytes < message_length; bytes++) {
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parity = parity_init;
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cur_byte = in_message[bytes];
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bit = 0;
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if (serial_format.bit_order == MSB_FIRST) {
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ordered_word = cur_byte;
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for (bits = 0; bits < data_bits; bits++) {
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bit = (cur_byte >> bits) & 1; // Get LSB
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parity += bit;
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}
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} else {
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ordered_word = 0;
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for (bits = 0; bits < data_bits; bits++) {
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bit = (cur_byte >> bits) & 1; // Get LSB
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parity += bit;
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ordered_word |= (bit << ((data_bits - 1) - bits)); // Set MSB
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}
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}
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if (serial_format.parity) {
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ordered_word <<= 1;
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ordered_word |= (parity & 1);
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}
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for (bits = 0; bits < serial_format.stop_bits; bits++) {
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ordered_word <<= 1;
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ordered_word |= 1;
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}
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out_data[bytes] = ordered_word;
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}
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out_data[bytes] = 0; // End marker
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}
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// This accepts a word with start and stop bits removed !
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uint32_t deframe_word(uint32_t raw_word) {
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uint32_t cur_bit, deframed_word { 0 };
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size_t bit;
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serial_format_t serial_format = persistent_memory::serial_format();
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/*if (serial_format.parity == ODD)
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parity = 1;
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else
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parity = 0;*/
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size_t data_bits = serial_format.data_bits;
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// Ignore parity for now
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if (serial_format.parity)
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raw_word >>= 1;
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if (serial_format.bit_order == LSB_FIRST) {
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// Reverse data bits
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for (bit = 0; bit < data_bits; bit++) {
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cur_bit = raw_word & 1;
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deframed_word <<= 1;
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deframed_word |= cur_bit;
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//parity += cur_bit;
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raw_word >>= 1;
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}
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return deframed_word;
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} else
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return raw_word;
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}
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} /* namespace modems */
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