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Separated NMEA GSV for GPS and GLONASS

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Generate GPGSV and GLGSV sentence separately
rather than combination according to satelite
prn number.

CRs-Fixed: 491156
Change-Id: Ie2bc60ae680a75cbe95702a7f842c1546a3a2f21
This commit is contained in:
Kevin Tang 2013-08-26 19:06:19 -07:00
parent b1e5bb90ac
commit 05b385d8e0
1 changed files with 132 additions and 25 deletions
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157
loc_api/libloc_api_50001/loc_eng_nmea.cpp
View file

@ -29,7 +29,10 @@
#define LOG_NDDEBUG 0
#define LOG_TAG "LocSvc_eng_nmea"
#define GPS_PRN_START 1
#define GPS_PRN_END 32
#define GLONASS_PRN_START 65
#define GLONASS_PRN_END 96
#include <loc_eng.h>
#include <loc_eng_nmea.h>
#include <math.h>
@ -605,12 +608,33 @@ void loc_eng_nmea_generate_sv(loc_eng_data_s_type *loc_eng_data_p,
char* pMarker = sentence;
int lengthRemaining = sizeof(sentence);
int length = 0;
int svCount = svStatus.num_svs;
int sentenceCount = 0;
int sentenceNumber = 1;
int svNumber = 1;
int gpsCount = 0;
int glnCount = 0;
//Count GPS SVs for saparating GPS from GLONASS and throw others
for(svNumber=1; svNumber <= svCount; svNumber++) {
if( (svStatus.sv_list[svNumber-1].prn >= GPS_PRN_START)&&
(svStatus.sv_list[svNumber-1].prn <= GPS_PRN_END) )
{
gpsCount++;
}
else if( (svStatus.sv_list[svNumber-1].prn >= GLONASS_PRN_START) &&
(svStatus.sv_list[svNumber-1].prn <= GLONASS_PRN_END) )
{
glnCount++;
}
}
// ------------------
// ------$GPGSV------
// ------------------
if (svStatus.num_svs <= 0)
if (gpsCount <= 0)
{
// no svs in view, so just send a blank $GPGSV sentence
strlcpy(sentence, "$GPGSV,1,1,0,", sizeof(sentence));
@ -619,12 +643,9 @@ void loc_eng_nmea_generate_sv(loc_eng_data_s_type *loc_eng_data_p,
}
else
{
int svCount = svStatus.num_svs;
int sentenceCount = svCount / 4;
if (svStatus.num_svs % 4)
sentenceCount++;
int sentenceNumber = 1;
int svNumber = 1;
svNumber = 1;
sentenceNumber = 1;
sentenceCount = gpsCount/4 + (gpsCount % 4 != 0);
while (sentenceNumber <= sentenceCount)
{
@ -642,26 +663,16 @@ void loc_eng_nmea_generate_sv(loc_eng_data_s_type *loc_eng_data_p,
pMarker += length;
lengthRemaining -= length;
for (int i=0; (svNumber <= svCount) && (i < 4); i++, svNumber++)
for (int i=0; (svNumber <= svCount) && (i < 4); svNumber++)
{
length = snprintf(pMarker, lengthRemaining,",%02d,%02d,%03d,",
if( (svStatus.sv_list[svNumber-1].prn >= GPS_PRN_START) &&
(svStatus.sv_list[svNumber-1].prn <= GPS_PRN_END) )
{
length = snprintf(pMarker, lengthRemaining,",%02d,%02d,%03d,",
svStatus.sv_list[svNumber-1].prn,
(int)(0.5 + svStatus.sv_list[svNumber-1].elevation), //float to int
(int)(0.5 + svStatus.sv_list[svNumber-1].azimuth)); //float to int
if (length < 0 || length >= lengthRemaining)
{
LOC_LOGE("NMEA Error in string formatting");
return;
}
pMarker += length;
lengthRemaining -= length;
if (svStatus.sv_list[svNumber-1].snr > 0)
{
length = snprintf(pMarker, lengthRemaining,"%02d",
(int)(0.5 + svStatus.sv_list[svNumber-1].snr)); //float to int
if (length < 0 || length >= lengthRemaining)
{
LOC_LOGE("NMEA Error in string formatting");
@ -669,15 +680,111 @@ void loc_eng_nmea_generate_sv(loc_eng_data_s_type *loc_eng_data_p,
}
pMarker += length;
lengthRemaining -= length;
}
if (svStatus.sv_list[svNumber-1].snr > 0)
{
length = snprintf(pMarker, lengthRemaining,"%02d",
(int)(0.5 + svStatus.sv_list[svNumber-1].snr)); //float to int
if (length < 0 || length >= lengthRemaining)
{
LOC_LOGE("NMEA Error in string formatting");
return;
}
pMarker += length;
lengthRemaining -= length;
}
i++;
}
}
length = loc_eng_nmea_put_checksum(sentence, sizeof(sentence));
loc_eng_nmea_send(sentence, length, loc_eng_data_p);
sentenceNumber++;
}
} //while
} //if
// ------------------
// ------$GLGSV------
// ------------------
if (glnCount <= 0)
{
// no svs in view, so just send a blank $GLGSV sentence
strlcpy(sentence, "$GLGSV,1,1,0,", sizeof(sentence));
length = loc_eng_nmea_put_checksum(sentence, sizeof(sentence));
loc_eng_nmea_send(sentence, length, loc_eng_data_p);
}
else
{
svNumber = 1;
sentenceNumber = 1;
sentenceCount = glnCount/4 + (glnCount % 4 != 0);
while (sentenceNumber <= sentenceCount)
{
pMarker = sentence;
lengthRemaining = sizeof(sentence);
length = snprintf(pMarker, lengthRemaining, "$GLGSV,%d,%d,%02d",
sentenceCount, sentenceNumber, svCount);
if (length < 0 || length >= lengthRemaining)
{
LOC_LOGE("NMEA Error in string formatting");
return;
}
pMarker += length;
lengthRemaining -= length;
for (int i=0; (svNumber <= svCount) && (i < 4); svNumber++)
{
if( (svStatus.sv_list[svNumber-1].prn >= GLONASS_PRN_START) &&
(svStatus.sv_list[svNumber-1].prn <= GLONASS_PRN_END) ) {
length = snprintf(pMarker, lengthRemaining,",%02d,%02d,%03d,",
svStatus.sv_list[svNumber-1].prn,
(int)(0.5 + svStatus.sv_list[svNumber-1].elevation), //float to int
(int)(0.5 + svStatus.sv_list[svNumber-1].azimuth)); //float to int
if (length < 0 || length >= lengthRemaining)
{
LOC_LOGE("NMEA Error in string formatting");
return;
}
pMarker += length;
lengthRemaining -= length;
if (svStatus.sv_list[svNumber-1].snr > 0)
{
length = snprintf(pMarker, lengthRemaining,"%02d",
(int)(0.5 + svStatus.sv_list[svNumber-1].snr)); //float to int
if (length < 0 || length >= lengthRemaining)
{
LOC_LOGE("NMEA Error in string formatting");
return;
}
pMarker += length;
lengthRemaining -= length;
}
i++;
}
}
length = loc_eng_nmea_put_checksum(sentence, sizeof(sentence));
loc_eng_nmea_send(sentence, length, loc_eng_data_p);
sentenceNumber++;
} //while
}//if
if (svStatus.used_in_fix_mask == 0)
{ // No sv used, so there will be no position report, so send