how do i use sat` information?

[dd]

hello, i need the data from DREG_GPS_SAT_1_2 to DREG_GPS_SAT_11_12.
I check whether UM7 transfers this or not and i can’t find the data.
your UM7 firmware didn’t offer sat` infomation in data tab.
i need to know how can i use this data.

[Caleb Chamberlain]

The UM7 does transmit that information if bit 4 in the CREG_COM_SETTINGS register is set. Details about what is contained in the satellite status registers can be found in the datasheet here: http://www.chrobotics.com/docs/UM7_Datasheet.pdf

The Serial Interface doesn’t currently watch for those registers or make data plots available for them. To extract the data, you’d need to either log the raw data from the sensor and then parse it, or write a parser that reads the data in real-time as it is sent by the sensor.

[John]

Hello i’ve set ‘bit 4 in the CREG_COM_SETTINGS register’ to get GPS_sat information.
Below is what i make code by mbed. Even this code is compiled, there is no change.

void UM7::commandGpsSat(void)
{
char tx_data[11]= {‘s’,’n’,’p’,0x00,0x00,0x50,0x00,0x01,0x10,0x01,0xB2};//snp//0x73 + 0x6E + 0x70
//pt// resi//50000110
// s n p ‘Packet Type byte’ ‘Address of GET_FW_REVISION register’ ‘Checksum high byte’ ‘Checksum low byte’
for(int i=0; i<11; i++) {
_um7.putc(tx_data[i]);
}
return;
}

could you offer me the solution?

[John]

Hello. I correct the code alittle.
i’ve set ‘Enable’ Broadcast Settings-GPS in the CHR Serial Interface.
And attached ‘bit 4 in the CREG_COM_SETTINGS register’ in the code to get GPS_sat information.
Below is the code that i made by mbed. Even this code is compiled, there is no change.

void UM7::commandGpsSat(void)
{
//char tx_data[]= {‘s’,’n’,’p’,0x00,0x00,0x50,0x00,0x01,0x10,0x01,0xB2};//snp//0x73 + 0x6E + 0x70
//char tx_data[]= {‘s’,’n’,’p’,0x80,0x00,0x50,0x00,0x01,0x10,0x02,0x32};//snp//0x73 + 0x6E + 0x70
char tx_data[]= {‘s’,’n’,’p’,0xc4,0x00,0x50,0x00,0x01,0x10,0x02,0x76};//snp//0x73 + 0x6E + 0x70
//pt// resi//50000110
// s n p ‘Packet Type byte’ ‘Address of GET_FW_REVISION register’ ‘Checksum high byte’ ‘Checksum low byte’
for(int i=0; i<11; i++) {
_um7.putc(tx_data[i]);
}
return;
}
Could you tell me which thing is matter? or Is there other methods to get ‘DREG_GPS_SAT_n_n’ information?

[Caleb Chamberlain]

Once bit 4 in the COM_SETTINGS register is set, you don’t need to transmit anything to read satellite information from the UM7 – it will transmit satellite information on its own. All you have to do is watch for the data to arrive.

[John]

After implementing upper code, I confirm ‘data address’ and ‘data packet’. But there wasn’t satellite information.
I think bit 4 in the COM_SETTINGS register wasn’t work as i wished. please let me know which one is wrong in the upper code.

[Caleb Chamberlain]

I presume that you’ve connected a GPS module to your UM7? The UM7 won’t transmit satellite information unless an external GPS module is connected, and that GPS module must be transmitting NMEA GSV packets. Verify that your GPS module is connected properly and sending correctly formatted GSV packets.

[John]

We are already check advice you give to me in forum.
Our GPS sends GSV packet in every 5 sec normally and i changed configuration-setting.
There are our configuration data xml file (by using firmware) and recorded data(recorded by using serial program).
We just used getc() and putc() printf(“0x%x”) functions in code to get raw data.

Configuration : https://www.dropbox.com/s/by0bk7owvb9qajb/All_data_input%281Hz%29.xml?dl=0
—————————————————————————
summary
<Register hidden=”0″ address=”0″>50000110</Register>
<Register hidden=”0″ address=”1″>0</Register>
<Register hidden=”0″ address=”2″>0</Register>
….
—————————————————————————
Recorded Data(from UM7) : https://www.dropbox.com/s/f4aumpsbe5qu4xr/DataSheet.xlsx?dl=0
—————————————————————————
summary
address data are 0x55, 0x56, 0x61, 0x6d, 0x70, 0x79, 0x7d
0x83, sat’ infomation address, wasn’t parsed;
—————————————————————————

-<CHR_Registers Description=”Contains stored configuration and hidden register settings for a device with the specified firmware ID” Name=”Register Settings” ID=”U71C”>

If you think this Configuration has problem, can you give us configuration file (xml format) that can see satellite number?
I really don’t understand why um7 not send SV data.

[Michael]

Hi John,

Thanks for the detailed information. Everything on your UM7 appears to be set up correctly. Do you have a way of sending us the NMEA GSV packet sent by your GPS module?

[John]

Hello. This is John.
$GPGGA,013923.000,3726.9219,N,12639.5364,E,1,4,5.29,129.6,M,18.7,M,,*56
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPRMC,013923.000,A,3726.9219,N,12639.5364,E,1.60,276.44,240815,,,A*62
$GPVTG,276.44,T,,M,1.60,N,2.96,K,A*34
$GPGGA,013924.000,3726.9222,N,12639.5358,E,1,4,5.29,129.6,M,18.7,M,,*56
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPRMC,013924.000,A,3726.9222,N,12639.5358,E,1.59,276.67,240815,,,A*69
$GPVTG,276.67,T,,M,1.59,N,2.95,K,A*3C
$GPGGA,013925.000,3726.9221,N,12639.5352,E,1,4,5.29,129.6,M,18.7,M,,*5E
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPGSV,2,1,07,27,49,043,13,04,46,171,26,16,32,094,38,44,14,251,*76
$GPGSV,2,2,07,22,08,084,31,26,08,107,17,193,,,14*4A
$GPRMC,013925.000,A,3726.9221,N,12639.5352,E,1.56,276.35,240815,,,A*69
$GPVTG,276.35,T,,M,1.56,N,2.89,K,A*39
$GPGGA,013926.000,3726.9220,N,12639.5344,E,1,4,5.29,129.6,M,18.7,M,,*5B
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPRMC,013926.000,A,3726.9220,N,12639.5344,E,1.52,276.47,240815,,,A*6D
$GPVTG,276.47,T,,M,1.52,N,2.82,K,A*33
$GPGGA,013927.000,3726.9218,N,12639.5337,E,1,4,5.29,129.6,M,18.7,M,,*55
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPRMC,013927.000,A,3726.9218,N,12639.5337,E,1.50,275.13,240815,,,A*63
$GPVTG,275.13,T,,M,1.50,N,2.78,K,A*36
$GPGGA,013928.000,3726.9219,N,12639.5336,E,1,4,5.29,129.6,M,18.7,M,,*5A
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPRMC,013928.000,A,3726.9219,N,12639.5336,E,1.40,278.58,240815,,,A*6F
$GPVTG,278.58,T,,M,1.40,N,2.60,K,A*3C
$GPGGA,013929.000,3726.9206,N,12639.5352,E,1,4,5.29,129.7,M,18.7,M,,*56
$GPGSA,A,3,16,22,26,27,,,,,,,,,5.38,5.29,0.98*05
$GPRMC,013929.000,A,3726.9206,N,12639.5352,E,1.16,268.71,240815,,,A*6B
$GPVTG,268.71,T,,M,1.16,N,2.16,K,A*34
$GPGGA,013930.000,3726.9199,N,12639.5375,E,1,3,7.13,129.8,M,18.7,M,,*5D
$GPGSA,A,2,16,22,27,,,,,,,,,,7.20,7.13,1.00*00
$GPGSV,2,1,08,27,49,043,17,04,46,171,28,16,32,094,38,40,12,252,*72
$GPGSV,2,2,08,22,08,084,30,26,08,107,,193,,,15,01,,,30*41
$GPRMC,013930.000,A,3726.9199,N,12639.5375,E,0.83,268.93,240815,,,A*62
$GPVTG,268.93,T,,M,0.83,N,1.54,K,A*30
$GPGGA,013931.000,3726.9189,N,12639.5395,E,1,3,7.14,129.9,M,18.7,M,,*55
$GPGSA,A,2,16,22,27,,,,,,,,,,7.21,7.14,1.00*06
$GPRMC,013931.000,A,3726.9189,N,12639.5395,E,0.66,260.36,240815,,,A*60
$GPVTG,260.36,T,,M,0.66,N,1.22,K,A*3D
$GPGGA,013932.000,3726.9027,N,12639.4880,E,1,5,2.03,122.0,M,18.7,M,,*5A
$GPGSA,A,3,16,22,26,04,27,,,,,,,,2.25,2.03,0.97*0A
$GPRMC,013932.000,A,3726.9027,N,12639.4880,E,2.18,230.80,240815,,,A*6B
$GPVTG,230.80,T,,M,2.18,N,4.04,K,A*3F
$GPGGA,013933.000,3726.8967,N,12639.4750,E,1,5,2.03,119.6,M,18.7,M,,*5B
$GPGSA,A,3,16,22,26,04,27,,,,,,,,2.25,2.03,0.97*0A
$GPRMC,013933.000,A,3726.8967,N,12639.4750,E,1.88,218.47,240815,,,A*6F
$GPVTG,218.47,T,,M,1.88,N,3.48,K,A*3B

And this is our GPS datasheet;, “http://ascenkor.img.or.kr/downloads/AscenKorea-AKBU3-Datasheet.pdf&#8221;

[Author]

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