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Record the address type details when decoding.

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This commit is contained in:
Oliver Jowett 2016-09-14 16:37:07 +01:00
parent 10641303cb
commit 2a4aa29f03
2 changed files with 79 additions and 9 deletions
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74
mode_s.c
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@ -789,6 +789,30 @@ static void decodeESIdentAndCategory(struct modesMessage *mm)
mm->category_valid = 1;
}
// Handle setting a non-ICAO address
static void setIMF(struct modesMessage *mm)
{
mm->addr |= MODES_NON_ICAO_ADDRESS;
switch (mm->addrtype) {
case ADDR_ADSB_ICAO:
case ADDR_ADSB_ICAO_NT:
mm->addrtype = ADDR_ADSB_OTHER;
break;
case ADDR_TISB_ICAO:
mm->addrtype = ADDR_TISB_OTHER;
break;
case ADDR_ADSR_ICAO:
mm->addrtype = ADDR_ADSR_OTHER;
break;
default:
// Nothing.
break;
}
}
static void decodeESAirborneVelocity(struct modesMessage *mm, int check_imf)
{
// Airborne Velocity Message
@ -797,7 +821,7 @@ static void decodeESAirborneVelocity(struct modesMessage *mm, int check_imf)
mm->mesub = getbits(me, 6, 8);
if (check_imf && getbit(me, 9))
mm->addr |= MODES_NON_ICAO_ADDRESS;
setIMF(mm);
if (mm->mesub < 1 || mm->mesub > 4)
return;
@ -870,7 +894,7 @@ static void decodeESSurfacePosition(struct modesMessage *mm, int check_imf)
unsigned char *me = mm->ME;
if (check_imf && getbit(me, 21))
mm->addr |= MODES_NON_ICAO_ADDRESS;
setIMF(mm);
mm->airground = AG_GROUND; // definitely.
mm->cpr_lat = getbits(me, 23, 39);
@ -899,7 +923,7 @@ static void decodeESAirbornePosition(struct modesMessage *mm, int check_imf)
unsigned char *me = mm->ME;
if (check_imf && getbit(me, 8))
mm->addr |= MODES_NON_ICAO_ADDRESS;
setIMF(mm);
unsigned AC12Field = getbits(me, 9, 20);
@ -974,7 +998,7 @@ static void decodeESAircraftStatus(struct modesMessage *mm, int check_imf)
}
if (check_imf && getbit(me, 56))
mm->addr |= MODES_NON_ICAO_ADDRESS;
setIMF(mm);
}
}
@ -985,7 +1009,7 @@ static void decodeESTargetStatus(struct modesMessage *mm, int check_imf)
mm->mesub = getbits(me, 6, 7); // an unusual message: only 2 bits of subtype
if (check_imf && getbit(me, 51))
mm->addr |= MODES_NON_ICAO_ADDRESS;
setIMF(mm);
if (mm->mesub == 0) { // Target state and status, V1
// TODO: need RTCA/DO-260A
@ -1040,7 +1064,7 @@ static void decodeESOperationalStatus(struct modesMessage *mm, int check_imf)
// Aircraft Operational Status
if (check_imf && getbit(me, 56))
mm->addr |= MODES_NON_ICAO_ADDRESS;
setIMF(mm);
if (mm->mesub == 0 || mm->mesub == 1) {
mm->opstatus.valid = 1;
@ -1141,14 +1165,17 @@ static void decodeExtendedSquitter(struct modesMessage *mm)
if (mm->msgtype == 18) {
switch (mm->CF) {
case 0: // ADS-B ES/NT devices that report the ICAO 24-bit address in the AA field
mm->addrtype = ADDR_ADSB_ICAO_NT;
break;
case 1: // Reserved for ADS-B for ES/NT devices that use other addressing techniques in the AA field
mm->addrtype = ADDR_ADSB_OTHER;
mm->addr |= MODES_NON_ICAO_ADDRESS;
break;
case 2: // Fine TIS-B message (formats are close enough to DF17 for our purposes)
mm->source = SOURCE_TISB;
mm->addrtype = ADDR_TISB_ICAO;
check_imf = 1;
break;
@ -1156,20 +1183,26 @@ static void decodeExtendedSquitter(struct modesMessage *mm)
// TODO: decode me.
// For now we only look at the IMF bit.
mm->source = SOURCE_TISB;
if (getbit(me, 1))
mm->addrtype = ADDR_TISB_ICAO;
if (getbit(me, 1)) {
mm->addr |= MODES_NON_ICAO_ADDRESS;
mm->addrtype = ADDR_TISB_OTHER;
}
return;
case 5: // TIS-B messages that relay ADS-B Messages using anonymous 24-bit addresses (format not explicitly defined, but it seems to follow DF17)
mm->addrtype = ADDR_TISB_ANON;
mm->source = SOURCE_TISB;
mm->addr |= MODES_NON_ICAO_ADDRESS;
break;
case 6: // ADS-B rebroadcast using the same type codes and message formats as defined for DF = 17 ADS-B messages
mm->addrtype = ADDR_ADSR_ICAO;
check_imf = 1;
break;
default: // All others, we don't know the format.
mm->addrtype = ADDR_UNKNOWN;
mm->addr |= MODES_NON_ICAO_ADDRESS; // assume non-ICAO
return;
}
@ -1325,6 +1358,29 @@ static const char *speed_source_to_string(speed_source_t speed) {
}
}
static const char *addrtype_to_string(addrtype_t type) {
switch (type) {
case ADDR_ADSB_ICAO:
return "ADS-B";
case ADDR_ADSB_ICAO_NT:
return "ADS-B, non-transponder";
case ADDR_ADSB_OTHER:
return "ADS-B, other addressing scheme";
case ADDR_TISB_ICAO:
return "TIS-B";
case ADDR_TISB_OTHER:
return "TIS-B, other addressing scheme";
case ADDR_TISB_ANON:
return "TIS-B, anonymized address";
case ADDR_ADSR_ICAO:
return "ADS-R";
case ADDR_ADSR_OTHER:
return "ADS-R, other addressing scheme";
default:
return "unknown addressing scheme";
}
}
static void print_hex_bytes(unsigned char *data, size_t len) {
size_t i;
for (i = 0; i < len; ++i) {
@ -1562,9 +1618,9 @@ void displayModesMessage(struct modesMessage *mm) {
printf("\n");
if (mm->addr & MODES_NON_ICAO_ADDRESS) {
printf(" Other Address: %06X\n", mm->addr);
printf(" Other Address: %06X (%s)\n", mm->addr & 0xFFFFFF, addrtype_to_string(mm->addrtype));
} else {
printf(" ICAO Address: %06X\n", mm->addr);
printf(" ICAO Address: %06X (%s)\n", mm->addr, addrtype_to_string(mm->addrtype));
}
if (mm->airground != AG_INVALID) {