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Permalink Reply by emile on September 21, 2011 at 6:11am

Follow this link for the firmware update. Not sure if there is a link for firmware downgrade though....

GPS firmware update

 

These are the commands I know that are used in the  AP/AC code:

 

MTK_SET_BINARY "$PGCMD,16,0,0,0,0,0*6A\r\n"

MTK_SET_NMEA "$PGCMD,16,1,1,1,1,1*6B\r\n"

 

MTK_OUTPUT_1HZ "$PMTK220,1000*1F\r\n"

MTK_OUTPUT_2HZ "$PMTK220,500*2B\r\n"

MTK_OUTPUT_4HZ "$PMTK220,250*29\r\n"

MTK_OTUPUT_5HZ "$PMTK220,200*2C\r\n"

MTK_OUTPUT_10HZ "$PMTK220,100*2F\r\n"

 

MTK_BAUD_RATE_38400 "$PMTK251,38400*27\r\n"

 

I'm sure you can find more on the internet... :)

Cheers,

Emile

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Permalink Reply by Manuel Fernando Cardoso da Silva on September 22, 2011 at 1:30pm

Emile,

Tthanks for your reply and information. What I would like to know if it is possible change for binary protocol and lets say 115200 Baud rate and this be logged in the firmware, to avoid avery time I power up I have to change the parameters.

 

Your reply or some one else is appreciated.

 

Thanks in advance,

Manuel 

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Permalink Reply by John Bond on September 22, 2011 at 6:17pm

At least some of the MTK GPS chipsets should be able to change the default start up baud rate.  Look at the PMTK390 command.  I'm not sure about binary vs. NMEA mode.

 

One reference for the command is:

http://www.flytron.com/pdf/MTK_commands.pdf

 

I haven't tried this command.  I just remember it because some older OSDs needed a certain initial baud rate to work correctly and this was suggested.

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Permalink Reply by emile on September 23, 2011 at 1:17am

Not sure how exacltly it works, but have a look at this zip. It has an utility to configure and test the GPS.

http://code.google.com/p/ardupilot/downloads/detail?name=MTK_DIYdro...

Since the MTK has a custom firmware for diydrones, I'm not totally sure it will work but worth a try.

 

Emile

 

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Permalink Reply by Manuel Fernando Cardoso da Silva on September 24, 2011 at 6:59am

John and Emile,

 

Thanks for your reply.

 

 It was good if I could change the default baud reate, it would save me a UART Port. For my project I only need a RX from the GPS and a TX to transmite data to another system,

 

I am going to give a try to your sugestions.

Thanks again for your reply and help.

 

Regards,

Manuel

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