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Re: [gpsd-users] Using gpsctl to put a U-blox chip in low power mode

From: Eric S. Raymond
Subject: Re: [gpsd-users] Using gpsctl to put a U-blox chip in low power mode
Date: Tue, 20 May 2014 22:18:52 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

Smith, Ashley M - Exelis <address@hidden>:
> I am trying to use the gpsctl command to put the U-blox MAX7 chip in low 
> power mode.
> According to the documentation for the chip.  The CFG-RXM message is what I 
> need to use:
> Header: 0xB5 0X62
> ID: 0x06 0x11
> Length (Bytes): 2
> Payload: Byte offset 0, U1 format, reserved, always set to 8
>                    Byte offset 1, U1 format, 1pMode, Low power mode 
> 0:Continuous, 1:Power Save, 2-3: reserved 4: Continuous Mode, 5-255: reserved.
> Using
> gpsctl -D5 -t "uBlox UBX binary" -e /dev/ttymxc2 -x '\x06\x11\x08\x01'
> Output:
> gpsctl -f -D5 -t "uBlox UBX binary" -e /dev/ttymxc2  -x '\x06\x11\x08\x01'
> gpsctl:PROG: uBlox UBX binary driver selected.
> gpsctl:PROG: switch_driver(uBlox UBX binary) called...
> gpsctl:PROG: selecting uBlox UBX binary driver...
> gpsctl:IO: => GPS: UBX class: 06, id: 11, len: 2, crc: 2292
> ยต"'gpsctl:IO: => GPS: b5620611020008012292
> I am not noticing any difference.
> Is there any way to tell if the chip is receiving the command?  Any other 
> suggestions?

Check the command description to see if it generates an ACK. If it does, watch 
for that under -D 5.
                <a href="";>Eric S. Raymond</a>

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