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https://github.com/eried/portapack-mayhem.git
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Started work on ADS-B TX baseband processor
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furrtek
parent
596071e8f8
commit
ef0feae62b
15 changed files with 413 additions and 82 deletions
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@ -48,13 +48,92 @@ void ADSBTxView::paint(Painter& painter) {
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button_callsign.set_text(callsign);
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}
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void ADSBTxView::generate_frame() {
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void ADSBTxView::generate_frame_pos() {
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uint8_t b, c, s, time_parity, bitn;
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char ch;
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std::string str_debug;
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uint16_t altitude_coded = (38000 + 1000) / 25;
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uint32_t LAT, LON;
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float delta_lat, yz, rlat, delta_lon, xz;
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uint8_t adsb_crc[14]; // Temp buffer
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uint32_t crc_poly = 0x1205FFF;
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LAT = 0;
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adsb_frame[0] = (options_format.selected_index_value() << 3) | 5; // DF and CA
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adsb_frame[1] = 0x48; // ICAO24
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adsb_frame[2] = 0x40;
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adsb_frame[3] = 0xD6;
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adsb_frame[4] = 0x58; // TC, SS and NICsb
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// altitude = (feet + 1000) / 25
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// LAT:
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// index j = floor(59*latcprE-60*latcprO+0.50)
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// latE = DlatE*(mod(j,60)+latcprE)
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// latO = DlatO*(mod(j,59)+latcprO)
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// if latE >= 270 -> latE -= 360
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// if latO >= 270 -> latO -= 360
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//time_parity = 0; // 0~1
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//delta_lat = 90.0 / (60.0 - (time_parity / 4.0));
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//yz = 524288.0 * (mod(lat, delta_lat) / delta_lat); // Round to int !
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//rlat = delta_lat * ((yz / 524288.0) + int(lat / delta_lat));
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//delta_lon = 360.0 / (NL(rlat) - time_parity);
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//xz = 524288.0 * (mod(lon, delta_lon) / delta_lon); // Round to int !
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/*if (time_parity) {
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A = sign(rlat0)[NL(rlat0) - NL(rlat1)];
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}*/
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// int xz and yz, then:
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// xz >>= 2;
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// yz >>= 2;
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// To get 17 bits
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// aaaaaaa Q bbbb
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adsb_frame[5] = ((altitude_coded & 0x7F0) >> 3) | 1;
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adsb_frame[6] = ((altitude_coded & 0x00F) << 4) | (LAT >> 15); // Then 0, even/odd, and the 2 LAT-CPR MSBs
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adsb_frame[11] = 0x00; // Clear CRC
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adsb_frame[12] = 0x00;
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adsb_frame[13] = 0x00;
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// Compute CRC
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memcpy(adsb_crc, adsb_frame, 14);
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for (c = 0; c < 11; c++) {
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for (b = 0; b < 8; b++) {
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if ((adsb_crc[c] << b) & 0x80) {
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for (s = 0; s < 25; s++) {
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bitn = (c * 8) + b + s;
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if ((crc_poly >> s) & 1) adsb_crc[bitn >> 3] ^= (0x80 >> (bitn & 7));
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}
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}
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}
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}
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// Insert CRC in frame
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for (c = 0; c < 3; c++)
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adsb_frame[c + 11] = adsb_crc[c + 11];
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// Convert to binary
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for (c = 0; c < 112; c++)
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adsb_bin[c] = (adsb_frame[c >> 3] >> (7 - (c & 7))) & 1;
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// Display for debug
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str_debug = "";
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for (c = 0; c < 7; c++)
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str_debug += to_string_hex(adsb_frame[c], 2);
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text_frame_a.set(str_debug);
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str_debug = "";
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for (c = 0; c < 7; c++)
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str_debug += to_string_hex(adsb_frame[c + 7], 2);
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text_frame_b.set(str_debug);
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}
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void ADSBTxView::generate_frame_id() {
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uint8_t b, c, s, bitn;
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char ch;
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std::string str_debug;
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std::string callsign_formatted(8, '_');
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uint64_t callsign_coded = 0;
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uint8_t adsb_crc[14]; // Temp buffer
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// 1 00100000 01011111 11111111
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uint32_t crc_poly = 0x1205FFF;
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// Init frame
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@ -91,7 +170,7 @@ void ADSBTxView::generate_frame() {
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adsb_frame[c + 5] = (callsign_coded >> ((5 - c) * 8)) & 0xFF;
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// Compute CRC
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memcpy(adsb_crc, adsb_frames, 14);
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memcpy(adsb_crc, adsb_frame, 14);
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for (c = 0; c < 11; c++) {
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for (b = 0; b < 8; b++) {
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if ((adsb_crc[c] << b) & 0x80) {
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@ -106,18 +185,28 @@ void ADSBTxView::generate_frame() {
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for (c = 0; c < 3; c++)
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adsb_frame[c + 11] = adsb_crc[c + 11];
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// Display as text
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text_message.set(to_string_hex((adsb_frame[11] << 16) + (adsb_frame[12] << 8) + adsb_frame[13], 6));
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//text_message.set(callsign_formatted);
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// Convert to binary
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for (c = 0; c < 112; c++)
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adsb_bin[c] = (adsb_frame[c >> 3] >> (7 - (c & 7))) & 1;
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//ascii_to_ccir(ccir_message);
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// Display for debug
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str_debug = "";
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for (c = 0; c < 7; c++)
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str_debug += to_string_hex(adsb_frame[c], 2);
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text_frame_a.set(str_debug);
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str_debug = "";
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for (c = 0; c < 7; c++)
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str_debug += to_string_hex(adsb_frame[c + 7], 2);
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text_frame_b.set(str_debug);
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text_message.set(callsign_formatted);
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}
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void ADSBTxView::start_tx() {
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transmitter_model.set_tuning_frequency(450000000); // FOR TESTING - DEBUG
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transmitter_model.set_tuning_frequency(452000000); // FOR TESTING - DEBUG
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transmitter_model.set_baseband_configuration({
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.mode = 0,
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.sampling_rate = 1536000U, // CHANGE !
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.sampling_rate = 2000000U, // Good ?
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.decimation_factor = 1,
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});
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transmitter_model.set_rf_amp(true);
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@ -126,23 +215,8 @@ void ADSBTxView::start_tx() {
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transmitter_model.set_baseband_bandwidth(1750000);
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transmitter_model.enable();
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//memcpy(shared_memory.tx_data, adsb_frame, 112);
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//baseband::set_adsb_data(1);
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}
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// ASCII to frequency LUT index
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void ADSBTxView::ascii_to_ccir(char *ascii) {
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uint8_t c;
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for (c = 0; c < 20; c++) {
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if (ascii[c] > '9')
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ascii[c] -= 0x37;
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else
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ascii[c] -= 0x30;
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}
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// EOM code for baseband
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ascii[20] = 0xFF;
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memcpy(shared_memory.tx_data, adsb_bin, 112);
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baseband::set_adsb();
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}
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void ADSBTxView::on_txdone(const int n) {
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@ -163,7 +237,9 @@ void ADSBTxView::on_txdone(const int n) {
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ADSBTxView::ADSBTxView(NavigationView& nav) {
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(void)nav;
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baseband::run_image(portapack::spi_flash::image_tag_xylos);
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baseband::run_image(portapack::spi_flash::image_tag_adsb_tx);
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// http://openflights.org
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add_children({ {
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&text_format,
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@ -172,6 +248,8 @@ ADSBTxView::ADSBTxView(NavigationView& nav) {
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&button_icao,
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&text_callsign,
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&button_callsign,
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&text_frame_a,
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&text_frame_b,
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&progress,
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&text_message,
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&button_transmit
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@ -184,7 +262,7 @@ ADSBTxView::ADSBTxView(NavigationView& nav) {
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options_format.on_change = [this](size_t i, int32_t v) {
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(void)i;
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(void)v;
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generate_frame();
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generate_frame_id();
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};
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button_callsign.on_select = [this, &nav](Button&) {
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textentry(nav, callsign, 9);
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@ -192,15 +270,15 @@ ADSBTxView::ADSBTxView(NavigationView& nav) {
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button_transmit.set_style(&style_val);
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generate_frame();
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generate_frame_id();
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// Single transmit
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button_transmit.on_select = [this,&nav](Button&) {
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button_transmit.on_select = [this, &nav](Button&) {
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if (tx_mode == IDLE) {
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tx_mode = SINGLE;
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button_transmit.set_style(&style_cancel);
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button_transmit.set_text("Wait");
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generate_frame();
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generate_frame_id();
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start_tx();
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}
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};
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