portapack-mayhem/firmware/application/protocols/bht.cpp

/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2016 Furrtek
 *
 * This file is part of PortaPack.
 *
 * 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 "bht.hpp"
#include "portapack_persistent_memory.hpp"

size_t gen_message_ep(uint8_t city_code, size_t family_code_ep, uint32_t relay_number, uint32_t relay_state) {
    size_t c;
    const encoder_def_t* um3750_def;
    uint8_t bits[12];
    std::string ep_fragments;

    // Pre-allocate to avoid fragmentation.
    ep_fragments.reserve(384);

    // Repeated 2x 26 times
    // Whole frame + space = 128ms, data only = 64ms

    um3750_def = &encoder_defs[ENCODER_UM3750];

    // City code is bit-reversed
    for (c = 0; c < 8; c++)
        bits[c] = (city_code >> c) & 1;

    bits[8] = (family_code_ep >> 1) & 1;
    bits[9] = family_code_ep & 1;
    bits[10] = relay_number & 1;
    bits[11] = relay_state ? 1 : 0;

    // Text for display
    // for (c = 0; c < 12; c++)
    //	ep_message[c] = bits[c] + '0';

    c = 0;
    for (auto ch : um3750_def->word_format) {
        if (ch == 'S')
            ep_fragments += um3750_def->sync;
        else
            ep_fragments += um3750_def->bit_format[bits[c++]];
    }

    // Return bitstream length
    return make_bitstream(ep_fragments);
}

std::string gen_message_xy(const std::string& ascii_code) {
    std::string local_code = ascii_code;
    uint8_t ccir_message[XY_TONE_COUNT];
    uint8_t translate;
    uint32_t c;

    // Replace repeats with E code
    for (c = 1; c < XY_TONE_COUNT; c++)
        if (local_code[c] == local_code[c - 1]) local_code[c] = 'E';

    for (c = 0; c < XY_TONE_COUNT; c++) {
        if (local_code[c] <= '9')
            translate = local_code[c] - '0';
        else
            translate = local_code[c] - 'A' + 10;
        ccir_message[c] = (translate < 16) ? translate : 0;  // Sanitize
    }

    // Copy for baseband
    memcpy(shared_memory.bb_data.tones_data.message, ccir_message, XY_TONE_COUNT);

    // Return as text for display
    return local_code;
}

std::string gen_message_xy(size_t header_code_a, size_t header_code_b, size_t city_code, size_t family_code, bool subfamily_wc, size_t subfamily_code, bool id_wc, size_t receiver_code, size_t relay_state_A, size_t relay_state_B, size_t relay_state_C, size_t relay_state_D) {
    uint8_t ccir_message[XY_TONE_COUNT];
    size_t c;

    // Header
    ccir_message[0] = (header_code_a / 10);
    ccir_message[1] = (header_code_a % 10);
    ccir_message[2] = (header_code_b / 10);
    ccir_message[3] = (header_code_b % 10);

    // Addresses
    ccir_message[4] = (city_code / 10);
    ccir_message[5] = (city_code % 10);
    ccir_message[6] = family_code;

    if (subfamily_wc)
        ccir_message[7] = 0xA;  // Wildcard
    else
        ccir_message[7] = subfamily_code;

    if (id_wc) {
        ccir_message[8] = 0xA;  // Wildcard
        ccir_message[9] = 0xA;  // Wildcard
    } else {
        ccir_message[8] = (receiver_code / 10);
        ccir_message[9] = (receiver_code % 10);
    }

    ccir_message[10] = 0xB;

    // Relay states
    ccir_message[11] = relay_state_A;
    ccir_message[12] = relay_state_B;
    ccir_message[13] = relay_state_C;
    ccir_message[14] = relay_state_D;

    ccir_message[15] = 0xB;

    // End
    for (c = 16; c < XY_TONE_COUNT; c++)
        ccir_message[c] = 0;

    // Replace repeats with E code
    for (c = 1; c < XY_TONE_COUNT; c++)
        if (ccir_message[c] == ccir_message[c - 1]) ccir_message[c] = 0xE;

    // Copy for baseband
    memcpy(shared_memory.bb_data.tones_data.message, ccir_message, XY_TONE_COUNT);

    // Return as text for display
    return ccir_to_ascii(ccir_message);
}

std::string ccir_to_ascii(uint8_t* ccir) {
    std::string ascii;

    for (size_t c = 0; c < XY_TONE_COUNT; c++) {
        if (ccir[c] > 9)
            ascii += (char)(ccir[c] - 10 + 'A');
        else
            ascii += (char)(ccir[c] + '0');
    }

    return ascii;
}