LiXiaoqi/minmea
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Merge commit 'pull/origin/5'

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Kosma Moczek 2014-04-24 16:02:40 +02:00
commit 6473d5b30e
5 changed files with 123 additions and 0 deletions
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15
README.md
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@ -20,6 +20,7 @@ systems.
* ``GGA`` (Fix Data)
* ``GSA`` (DOP and active satellites)
* ``GST`` (Pseudorange Noise Statistics)
* ``GSV`` (Satellites in view)
Adding support for more sentences is trivial; see ``minmea.c`` source.
@ -79,6 +80,20 @@ The library doesn't perform this conversion automatically for the following reas
printf("$GPGGA: fix quality: %d\n", frame.fix_quality);
}
} break;
case MINMEA_SENTENCE_GSV: {
struct minmea_sentence_gsv frame;
if (minmea_parse_gsv(&frame, line)) {
printf("$GPGSV: message %d of %d\n", frame.msg_nr, frame.total_msgs);
printf("$GPGSV: sattelites in view: %d\n", frame.total_sats);
for (int i = 0; i < 4; i++)
printf("$GPGSV: sat nr %d, elevation: %d, azimuth: %d, snr: %d dbm\n",
frame.sats[i].nr,
frame.sats[i].elevation,
frame.sats[i].azimuth,
frame.sats[i].snr);
}
} break;
}
}
```

14
example.c
View File

@ -62,6 +62,20 @@ int main()
}
} break;
case MINMEA_SENTENCE_GSV: {
struct minmea_sentence_gsv frame;
if (minmea_parse_gsv(&frame, line)) {
printf("$GPGSV: message %d of %d\n", frame.msg_nr, frame.total_msgs);
printf("$GPGSV: sattelites in view: %d\n", frame.total_sats);
for (int i = 0; i < 4; i++)
printf("$GPGSV: sat nr %d, elevation: %d, azimuth: %d, snr: %d dbm\n",
frame.sats[i].nr,
frame.sats[i].elevation,
frame.sats[i].azimuth,
frame.sats[i].snr);
}
} break;
default: {
} break;
}

36
minmea.c
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@ -321,6 +321,8 @@ enum minmea_sentence_id minmea_sentence_id(const char *sentence)
return MINMEA_SENTENCE_GSA;
if (!strcmp(type+2, "GST"))
return MINMEA_SENTENCE_GST;
if (!strcmp(type+2, "GSV"))
return MINMEA_SENTENCE_GSV;
return MINMEA_UNKNOWN;
}
@ -441,6 +443,40 @@ bool minmea_parse_gst(struct minmea_sentence_gst *frame, const char *sentence)
return true;
}
bool minmea_parse_gsv(struct minmea_sentence_gsv *frame, const char *sentence)
{
// $GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74
char type[6];
if (!minmea_scan(sentence, "tiiiiiiiiiiiiiiiiiii",
type,
&frame->total_msgs,
&frame->msg_nr,
&frame->total_sats,
&frame->sats[0].nr,
&frame->sats[0].elevation,
&frame->sats[0].azimuth,
&frame->sats[0].snr,
&frame->sats[1].nr,
&frame->sats[1].elevation,
&frame->sats[1].azimuth,
&frame->sats[1].snr,
&frame->sats[2].nr,
&frame->sats[2].elevation,
&frame->sats[2].azimuth,
&frame->sats[2].snr,
&frame->sats[3].nr,
&frame->sats[3].elevation,
&frame->sats[3].azimuth,
&frame->sats[3].snr
)) {
return false;
}
if (strcmp(type+2, "GSV"))
return false;
return true;
}
int minmea_gettimeofday(struct timeval *tv, const struct minmea_date *date, const struct minmea_time *time)
{

16
minmea.h
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@ -32,6 +32,7 @@ enum minmea_sentence_id {
MINMEA_SENTENCE_GGA,
MINMEA_SENTENCE_GSA,
MINMEA_SENTENCE_GST,
MINMEA_SENTENCE_GSV,
};
struct minmea_date {
@ -101,6 +102,20 @@ struct minmea_sentence_gsa {
int vdop, vdop_scale;
};
struct minmea_sat_info {
int nr;
int elevation;
int azimuth;
int snr;
};
struct minmea_sentence_gsv {
int total_msgs;
int msg_nr;
int total_sats;
struct minmea_sat_info sats[4];
};
/**
* Check sentence validity and checksum. Returns true for valid sentences.
*/
@ -136,6 +151,7 @@ bool minmea_parse_rmc(struct minmea_sentence_rmc *frame, const char *sentence);
bool minmea_parse_gga(struct minmea_sentence_gga *frame, const char *sentence);
bool minmea_parse_gsa(struct minmea_sentence_gsa *frame, const char *sentence);
bool minmea_parse_gst(struct minmea_sentence_gst *frame, const char *sentence);
bool minmea_parse_gsv(struct minmea_sentence_gsv *frame, const char *sentence);
/**
* Convert GPS UTC date/time representation to a UNIX timestamp.

42
tests.c
View File

@ -516,6 +516,47 @@ START_TEST(test_minmea_parse_gsa1)
}
END_TEST
START_TEST(test_minmea_parse_gsv1)
{
const char *sentence = "$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D";
struct minmea_sentence_gsv frame = {};
static const struct minmea_sentence_gsv expected = {
.total_msgs = 3,
.msg_nr = 3,
.total_sats = 11,
.sats = {
{
.nr = 22,
.elevation = 42,
.azimuth = 67,
.snr = 42
},
{
.nr = 24,
.elevation = 14,
.azimuth = 311,
.snr = 43
},
{
.nr = 27,
.elevation = 5,
.azimuth = 244,
.snr = 0
},
{
.nr = 0,
.elevation = 0,
.azimuth = 0,
.snr = 0
}
}
};
ck_assert(minmea_check(sentence) == true);
ck_assert(minmea_parse_gsv(&frame, sentence) == true);
ck_assert(!memcmp(&frame, &expected, sizeof(frame)));
}
END_TEST
START_TEST(test_minmea_usage1)
{
const char *sentences[] = {
@ -642,6 +683,7 @@ Suite *minmea_suite(void)
tcase_add_test(tc_parse, test_minmea_parse_gga1);
tcase_add_test(tc_parse, test_minmea_parse_gsa1);
tcase_add_test(tc_parse, test_minmea_parse_gst1);
tcase_add_test(tc_parse, test_minmea_parse_gsv1);
suite_add_tcase(s, tc_parse);
TCase *tc_usage = tcase_create("minmea_usage");