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Add NMEA $GPGSV Decoding for Sat Data

This commit is contained in:
tracernz 2015-01-31 18:08:36 +13:00
parent c226f6a412
commit cda2f3169e
1 changed files with 48 additions and 0 deletions
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48
src/main/io/gps.c
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@ -452,6 +452,7 @@ bool gpsNewFrame(uint8_t c)
#define NO_FRAME 0
#define FRAME_GGA 1
#define FRAME_RMC 2
#define FRAME_GSV 3
// This code is used for parsing NMEA data
@ -533,6 +534,8 @@ static bool gpsNewFrameNMEA(char c)
static uint8_t param = 0, offset = 0, parity = 0;
static char string[15];
static uint8_t checksum_param, gps_frame = NO_FRAME;
static uint8_t svMessageNum = 0;
uint8_t svSatNum = 0, svPacketIdx = 0, svSatParam = 0;
switch (c) {
case '$':
@ -549,6 +552,8 @@ static bool gpsNewFrameNMEA(char c)
gps_frame = FRAME_GGA;
if (string[0] == 'G' && string[1] == 'P' && string[2] == 'R' && string[3] == 'M' && string[4] == 'C')
gps_frame = FRAME_RMC;
if (string[0] == 'G' && string[1] == 'P' && string[2] == 'G' && string[3] == 'S' && string[4] == 'V')
gps_frame = FRAME_GSV;
}
switch (gps_frame) {
@ -595,6 +600,49 @@ static bool gpsNewFrameNMEA(char c)
break;
}
break;
case FRAME_GSV:
switch(param) {
/*case 1:
// Total number of messages of this type in this cycle
break; */
case 2:
// Message number
svMessageNum = grab_fields(string, 0);
break;
case 3:
// Total number of SVs visible
GPS_numCh = grab_fields(string, 0);
break;
}
if(param < 4)
break;
svPacketIdx = (param - 4) / 4 + 1; // satellite number in packet, 1-4
svSatNum = svPacketIdx + (4 * (svMessageNum - 1)); // global satellite number
svSatParam = param - 3 - (4 * (svPacketIdx - 1)); // parameter number for satellite
if(svSatNum > GPS_SV_MAXSATS)
break;
switch(svSatParam) {
case 1:
// SV PRN number
GPS_svinfo_chn[svSatNum - 1] = svSatNum;
GPS_svinfo_svid[svSatNum - 1] = grab_fields(string, 0);
break;
/*case 2:
// Elevation, in degrees, 90 maximum
break;
case 3:
// Azimuth, degrees from True North, 000 through 359
break; */
case 4:
// SNR, 00 through 99 dB (null when not tracking)
GPS_svinfo_cno[svSatNum - 1] = grab_fields(string, 0);
GPS_svinfo_quality[svSatNum - 1] = 0; // only used by ublox
break;
}
break;
}
param++;