Git-Mirrors/portapack-mayhem
1
0
Fork 0
mirror of https://github.com/eried/portapack-mayhem.git synced 2025-08-09 07:02:26 -04:00
Code Issues Projects Releases Packages Wiki Activity

ADSB RX now works \o/

Browse source 
Added tabs in RDS TX, multiple groups can be sent at once
Bugfix: text not updating on UI after text prompt
This commit is contained in:
furrtek 2017-08-16 10:02:57 +01:00
parent 160359166a
commit 9d902bc224
18 changed files with 664 additions and 590 deletions
Download patch file Download diff file Expand all files Collapse all files

63
firmware/common/adsb_frame.hpp
View file

@ -60,39 +60,41 @@ public:
uint8_t * get_raw_data() {
return raw_data;
}
std::string get_callsign() {
uint64_t callsign_coded = 0;
uint32_t c;
std::string callsign = "";
// Frame bytes to long
for (c = 5; c < 11; c++) {
callsign_coded <<= 8;
callsign_coded |= raw_data[c];
}
// Long to 6-bit characters
for (c = 0; c < 8; c++) {
callsign.append(1, icao_id_lut[(callsign_coded >> 42) & 0x3F]);
callsign_coded <<= 6;
}
return callsign;
}
void make_CRC() {
uint8_t adsb_crc[14]; // Temp buffer
uint32_t computed_CRC = compute_CRC();
// Insert CRC in frame
raw_data[11] = (computed_CRC >> 16) & 0xFF;
raw_data[12] = (computed_CRC >> 8) & 0xFF;
raw_data[13] = computed_CRC & 0xFF;
}
bool check_CRC() {
uint32_t computed_CRC = compute_CRC();
if (raw_data[11] != ((computed_CRC >> 16) & 0xFF)) return false;
if (raw_data[12] != ((computed_CRC >> 8) & 0xFF)) return false;
if (raw_data[13] != (computed_CRC & 0xFF)) return false;
return true;
}
private:
static const uint8_t adsb_preamble[16];
static const char icao_id_lut[65];
alignas(4) uint8_t index { 0 };
alignas(4) uint8_t raw_data[14] { }; // 112 bits at most
uint32_t compute_CRC() {
uint8_t adsb_crc[14] = { 0 }; // Temp buffer
uint8_t b, c, s, bitn;
const uint32_t crc_poly = 0x1205FFF;
// Clear CRC
raw_data[11] = 0x00;
raw_data[12] = 0x00;
raw_data[13] = 0x00;
// Copy frame data
memcpy(adsb_crc, raw_data, 11);
// Compute CRC
memcpy(adsb_crc, raw_data, 14);
for (c = 0; c < 11; c++) {
for (b = 0; b < 8; b++) {
if ((adsb_crc[c] << b) & 0x80) {
@ -104,15 +106,8 @@ public:
}
}
// Insert CRC in frame
memcpy(&raw_data[11], &adsb_crc[11], 3);
return (adsb_crc[11] << 16) + (adsb_crc[12] << 8) + adsb_crc[13];
}
private:
static const uint8_t adsb_preamble[16];
static const char icao_id_lut[65];
alignas(4) uint8_t index { 0 };
alignas(4) uint8_t raw_data[14] { }; // 112 bits at most
};
} /* namespace adsb */