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Extract callsign from DF20 and DF21

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This commit is contained in:
Malcolm Robb 2013-04-30 18:18:37 +01:00
parent 14c54599ac
commit 36778f1284
1 changed files with 36 additions and 2 deletions
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38
dump1090.c
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@ -1536,6 +1536,29 @@ void decodeModesMessage(struct modesMessage *mm, unsigned char *msg) {
}
}
}
// Fields for DF20, DF21 Comm-B
if ((mm->msgtype == 20) || (mm->msgtype == 21)){
if (msg[4] == 0x20) { // Aircraft Identification
uint32_t chars;
chars = (msg[5] << 16) | (msg[6] << 8) | (msg[7]);
mm->flight[3] = ais_charset[chars & 0x3F]; chars = chars >> 6;
mm->flight[2] = ais_charset[chars & 0x3F]; chars = chars >> 6;
mm->flight[1] = ais_charset[chars & 0x3F]; chars = chars >> 6;
mm->flight[0] = ais_charset[chars & 0x3F];
chars = (msg[8] << 16) | (msg[9] << 8) | (msg[10]);
mm->flight[7] = ais_charset[chars & 0x3F]; chars = chars >> 6;
mm->flight[6] = ais_charset[chars & 0x3F]; chars = chars >> 6;
mm->flight[5] = ais_charset[chars & 0x3F]; chars = chars >> 6;
mm->flight[4] = ais_charset[chars & 0x3F];
mm->flight[8] = '\0';
} else {
}
}
}
//
// This function gets a decoded Mode S Message and prints it on the screen
@ -1592,7 +1615,12 @@ void displayModesMessage(struct modesMessage *mm) {
printf(" ICAO Address : %06x\n", mm->addr);
if (mm->msgtype == 20) {
/* TODO: 56 bits DF20 MB additional field. */
printf(" Comm-B BDS : %x\n", mm->msg[4]);
// Decode the extended squitter message
if ( mm->msg[4] == 0x20) { // Aircraft identification
printf(" BDS 2,0 Aircraft Identification : %s\n", mm->flight);
}
}
} else if (mm->msgtype == 5 || mm->msgtype == 21) {
@ -1605,8 +1633,14 @@ void displayModesMessage(struct modesMessage *mm) {
printf(" ICAO Address : %06x\n", mm->addr);
if (mm->msgtype == 21) {
/* TODO: 56 bits DF21 MB additional field. */
printf(" Comm-B BDS : %x\n", mm->msg[4]);
// Decode the extended squitter message
if ( mm->msg[4] == 0x20) { // Aircraft identification
printf(" BDS 2,0 Aircraft Identification : %s\n", mm->flight);
}
}
} else if (mm->msgtype == 11) {
/* DF 11 */
printf("DF 11: All Call Reply.\n");