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Parse full airspy input.

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This commit is contained in:
Ian Gulliver
2016-02-14 22:26:34 +00:00
parent 93558c0a23
commit 276a78aac0
4 changed files with 73 additions and 8 deletions
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26
airspy_adsb.c
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@@ -1,27 +1,53 @@
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "common.h"
#include "airspy_adsb.h"
static bool airspy_adsb_parse_common(char *, struct packet *);
bool airspy_adsb_parse(struct buf *buf, struct packet *packet) {
if (buf->length < 35 ||
buf_chr(buf, 0) != '*') {
return false;
}
if (buf->length >= 35 &&
buf_chr(buf, 33) == '\r' &&
buf_chr(buf, 34) == '\n' &&
buf_chr(buf, 15) == ';') {
if (!airspy_adsb_parse_common(buf_at(buf, 16), packet)) {
return false;
}
packet->type = MODE_S_SHORT;
hex_to_bin(packet->data, buf_at(buf, 1), 7);
buf_consume(buf, 35);
return true;
}
if (buf->length >= 49 &&
buf_chr(buf, 47) == '\r' &&
buf_chr(buf, 48) == '\n' &&
buf_chr(buf, 29) == ';') {
if (!airspy_adsb_parse_common(buf_at(buf, 30), packet)) {
return false;
}
packet->type = MODE_S_LONG;
hex_to_bin(packet->data, buf_at(buf, 1), 14);
buf_consume(buf, 49);
return true;
}
return false;
}
static bool airspy_adsb_parse_common(char *in, struct packet *packet) {
if (in[8] != ';' ||
in[11] != ';' ||
in[16] != ';') {
return false;
}
uint16_t mlat_mhz = 2 * hex_to_int(&in[9], 1);
packet->mlat_timestamp = hex_to_int(in, 4) * (MLAT_MHZ / mlat_mhz);
packet->rssi = hex_to_int(&in[12], 2) * (RSSI_MAX / (1 << 16));
return true;
}