[−][src]Module adafruit_gps::PMTK

PMTK commands give the gps module settings for output.

To give a PMTK command send it via the Gps struct: gps.pmtk....(args). See simple.rs for example.

Note: All commands will be destructive for all sentences in the buffer. You will not be able to read data given by the gps after sending it a command.

Important commands

pmtk_220_set_nmea_updaterate -> Hz for the gps update rate.

//! pmtk_314_api_set_nmea_output -> Sets 6 modes, GLL is not included in any other docs.

Changing the baudrate

Given it's a special function, it's a stand alone methon in the send_pmtk module.

The port baud rate needs to be changed and the gps baudrate needs to be changed. To do so, a specific set of commands need to be given (changing to 57600, for example):

stty -F /dev/serial0 raw 9600 cs8 clocal -cstopb
echo -e "$PMTK251,57600*2C\r\n" > /dev/serial0
stty -F /dev/serial0 57600 clocal cread cs8 -cstopb -parenb

Then open the port at the new baudrate and you're good.

To remove sources of error, changing the baud rate here will do a full restart, so all saved options will be removed.

PMTK return formats

PMTK001

The PMTK001 command is the response given when there is a valid command given.

Commands are Invalid, Unsupported, Failed, Successful, or No packet received.

PMTK500

5** pmtk standards are all reply formats. Each is individual and unique.

Upon any kind of restart the following is printed: $CDACK,7,049\r\n -> Unknown what this is. This is what is given upon wake up. $PMTK011,MTKGPS08\r\n -> Output sys message. $PMTK010,0012E\r\n -> Sys message, 001 Startup. $PMTK011,MTKGPS08\r\n -> 001 txt message, output system message. $PMTK010,002*2D\r\n -> Sys msg, 002 = Notification, aiding EPO.

Modules

send_pmtk