Configurable GPS port speed

[Medvidas]

Hi,
would it be possible to have configurable GPS port speed?

In current revision the only supported speed is 9600 bps.
There are many GPS chipsets whose default speed is 38400 etc.
That is the case of new UBX-M10050 and many others.
To change the GPS module speed to 9600 is often not so easy process
so it will be nice to have such otion in RDZ firmware.
Thanks, Medvidas

[dl9rdz]

It is possible but just poorly documented.

You can create a file "gpsinit.txt" with a single line
b38400
This will put the port to speed 38400 baud.
http://<ip>/edit.html?file=gpsinit.txt
if you want to do it via the web interface

Edit: I just double checked, there is a minor thing to keep in mind: You have to configure the TXD pin for GPS. The main purpose of this file is to actually configure the GPS chip (for which you need TXD). If you connect the RX chip with only RX pin and want to switch to 38400 baud, then you have to put some fake unused pin number in the GPS "TXD"...

[ok1hga]

Hi,

I think the contents of the gpsinit file are not loaded, it has no effect on anything

Vlada
ok1hga

[ok1hga]

Hi,
. . . it works now,
the error was between the chair and the keyboard.
thanks
Vlada
ok1hga

[Medvidas]

Vlada, OK1HGA was working on this. The goal was to connect GPS module M10050-KB from new revisions of RS41 probe to TTGO.
To get it working the following steps were needed:

1. you need to flash TTGO to last DEV version with the gps module DISCONNECTED!
2. it was also necessary to connect RX and TX wires between TTGO and GPS module:
   TX of gps to the gpio 34, RX to gpio 12
3. the appropriate pins need to be set in the "hw config" menu
4. the baudrate was set in http:///edit.html?file=gpsinit.txt to b38400 as mentioned before