Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

RE: Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

Jan Cumps — Wed, 24 Jul 2024 19:13:17 GMT

for documentation: this is the out-of-box flow of data

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SV%2C2%2C1%2C08%2C72%2C79%2C113%2C%2C74%2C77%2C084%2C%2C75%2C38%2C202%2C%2C65%2C37%2C317%2C28%2A68%0A%24GLGSV%2C2%2C2%2C08%2C73%2C34%2C040%2C35%2C71%2C28%2C130%2C%2C81%2C13%2C333%2C24%2C82%2C08%2C017%2C%2A68%0A%24GPGLL%2C5051.78066%2CN%2C00422.57079%2CE%2C191237.000%2CA%2CA%2A50%0A%24PSTMCPU%2C40.28%2C-1%2C98%2A4D]

RE: Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

DAB — Sat, 20 Jul 2024 18:09:13 GMT

Nice update Jan.

I have just begun to use GPS receivers on some of my cameras.

I was very surprised at how robust the receiver section was to angle orientation.

I found they worked even at 90 degrees to horizontal.

RE: Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

Jan Cumps — Sat, 20 Jul 2024 12:20:15 GMT

I found a command that doesn't nicely fit in my reply-response paradigm: GPGSV.

Unlike GPGLL and GPRCM, it returns multiple lines. That means I have to adapt the reader functions and the class of my Teseo lib to deal with such scenarios...

---- Sent utf8 encoded message: "$PSTMNMEAREQUEST,80000,0\r\n" ----
$GPGSV,3,1,12,03,82,292,,02,54,132,21,17,48,278,,21,37,130,*7A
$GPGSV,3,2,12,04,37,183,,19,33,308,19,28,20,062,,31,16,096,*7C
$GPGSV,3,3,12,06,11,302,,22,07,267,,09,07,204,,32,05,037,*71
$GLGSV,2,1,07,88,66,314,20,72,65,044,26,87,51,144,20,65,51,219,*62
$GLGSV,2,2,07,71,15,039,29,81,13,322,32,80,11,358,35,,,,*58
$PSTMNMEAREQUEST,80000,0

RE: Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

Jan Cumps — Fri, 19 Jul 2024 17:31:28 GMT

This turned out to be helpful for 2 scenarios:

for the UART firmware that I'm writing for the GPS, but also
for the I2C existing firmware.

The freedom to test scenarios interactive, and get immediate feedback, was a big asset.

I learned what exactly happen, by looking while it happened. Easier than interpreting a spec or looking at (chunks of) bitstreams.

I still had to look at bitstreams, to create reliable firmware. But at that time, I already knew that the back-and-forth conversation was working.

RE: Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

Jan Cumps — Fri, 19 Jul 2024 09:29:53 GMT

This conversation reliably turns it into UART request-response:

Preparation:

Reset:
$PSTMSRR\r\n

it may generate a lot of messages every scond at this time. Shut the engine down:
$PSTMGPSSUSPEND\r\n

Once these two lines wizz by, the device becomes silent:
$PSTMGPSSUSPENDED*15
$PSTMGPSSUSPEND

clear out the UART buffer
$PSTMCFGMSGL,0,1,0,0\r\n

1 reply per request, no other messages are generated:
$PSTMSETPAR,1227,1,2\r\n

Restart the engine, configured for reply-response
$PSTMGPSRESTART\r\n

Once you get this message, we're online, in reply-response mode
$PSTMGPSRESTART

if you want this to be the standard behaviour of the GPS, you can store these settings with $PSTMSAVEPAR

Asking data:

Get GPGLL location
$PSTMNMEAREQUEST,100000,0\r\n

$GPGLL,5051.79800,N,00422.57465,E,091850.000,V,N*42
$PSTMNMEAREQUEST,100000,0

Get GPRMC with time:
$PSTMNMEAREQUEST,40,0\r\n

$GPRMC,091901.000,V,5051.79800,N,00422.57465,E,,,190724,,,N*79
$PSTMNMEAREQUEST,40,0

RE: Fun With UART, Global Navigation Satellite Systems (GNSS) and Teseo III

shabaz — Thu, 18 Jul 2024 22:31:37 GMT

That's very useful! Better set of tried-and-tested commands and easier to understand, than the Teseo documentation.

It's very non-trivial to figure this stuff out from their docs.