Turns out that there is some bug in 2.10xx firmware... and in fact 2.9xxx firmware.
A workaround to unbrick the display is to install 2.4 firmware... then reinstall 2.10
Search found 16 matches
- Wed May 09, 2018 4:01 pm
- Forum: GTT Series
- Topic: I2C Stops Working
- Replies: 7
- Views: 15116
- Sun May 06, 2018 11:35 am
- Forum: GTT Series
- Topic: GTT43a I2C Bug
- Replies: 3
- Views: 12384
GTT43a I2C Bug
I have a loop that does I2C reads... essentially like this while(1) { x = read print x } When you run this you will get 0's ... until there is something in the buffer... this is good. I have a screen with a legacy button. Every time you press the button it puts 252,135,0,2,0,7 into the buffer... whe...
- Fri May 04, 2018 9:32 am
- Forum: GTT Series
- Topic: GTT 2.5 Driver License
- Replies: 1
- Views: 11110
GTT 2.5 Driver License
There is a pretty coherent library here: https://github.com/MatrixOrbital/GTT-Arduino-Thermometer-Demo/tree/master/GTT%20Client%20Library/GttClient That seems to implement the GTT25 protocol (code 250)... which is super useful given that I dont see any documentation for it. So my question is... what...
- Thu May 03, 2018 1:38 pm
- Forum: GTT Series
- Topic: Text Toggle Button
- Replies: 2
- Views: 11356
Re: Text Toggle Button
I have been looking at driver libraries... There are tons of commands which I can see that are not documented... they all seem to fall into the "GTT25" ... presumably the 25 is a new protocol? I am really hoping there is some documentation so I dont have to reverse engineer it... as I am b...
- Thu May 03, 2018 10:33 am
- Forum: GTT Series
- Topic: Text Toggle Button
- Replies: 2
- Views: 11356
Text Toggle Button
I have three questions about the Text Toggle Button #1. I notice that when I press the button I get 252,250,0,3,1,10,254 ... however code 250 is not documented in the GTT Protocol V2.6 documentation. Am I looking at the wrong manual? If so where do I get the right one. #2... are there other undocume...
- Thu May 03, 2018 9:40 am
- Forum: GTT Series
- Topic: I2C Stops Working
- Replies: 7
- Views: 15116
Re: I2C Stops Working
Well.
I got a new display today. I plugged it into the same setup and it works.
I suppose my other one has a blown up I2C... which sucks
How do I RMA it?
Alan
I got a new display today. I plugged it into the same setup and it works.
I suppose my other one has a blown up I2C... which sucks
How do I RMA it?
Alan
- Tue May 01, 2018 11:21 am
- Forum: GTT Series
- Topic: I2C Read with GTT43
- Replies: 24
- Views: 32735
Re: I2C Read with GTT43
Awesome. Thank you that helps a lot.
- Tue May 01, 2018 11:19 am
- Forum: GTT Series
- Topic: I2C Stops Working
- Replies: 7
- Views: 15116
Re: I2C Stops Working
Yes I have tried multiple I2C addresses.
Yes I have 2.2K pull-ups... (it was working).
Is there some setting that turns I2C on/off in the screen? Could I have changed something?
At this point all I can figure is that I blew up something.
Alan
Yes I have 2.2K pull-ups... (it was working).
Is there some setting that turns I2C on/off in the screen? Could I have changed something?
At this point all I can figure is that I blew up something.
Alan
- Mon Apr 30, 2018 1:38 pm
- Forum: GTT Series
- Topic: I2C Read with GTT43
- Replies: 24
- Views: 32735
Re: I2C Read with GTT43
Thank you that is helpful. Having complete messages is good.
One more question... what happens if the display needs to over-run the buffer? Does it throw out earlier stuff? Or not write into it?
One more question... what happens if the display needs to over-run the buffer? Does it throw out earlier stuff? Or not write into it?
- Mon Apr 30, 2018 1:36 pm
- Forum: GTT Series
- Topic: I2C Stops Working
- Replies: 7
- Views: 15116
Re: I2C Stops Working
I can still write to it via the serial port... yes... using the UART I can send 254 88 and I get a clear screen... and I can read as well. What I cannot do is talk to the display via I2C. All writes and reads of the device are NAK I suspected that it might be a power problem (from another thread) so...
- Sun Apr 29, 2018 5:07 pm
- Forum: GTT Series
- Topic: I2C Stops Working
- Replies: 7
- Views: 15116
I2C Stops Working
I am able to talk to the GTT43A via Serial and via the Mass Storage.
I am no longer able to talk via I2C.
For the life of me I can't figure out what I could have done to turn off the I2C.
Does anyone have any idea?
I am no longer able to talk via I2C.
For the life of me I can't figure out what I could have done to turn off the I2C.
Does anyone have any idea?
- Fri Apr 27, 2018 2:56 pm
- Forum: GTT Series
- Topic: I2C Read with GTT43
- Replies: 24
- Views: 32735
Re: I2C Read with GTT43
I tried reading bytes to try to clear out the buffer... Looks like after I read about 25 bytes the buffer is clear... And then my commands work correctly (this is good). 1) is there a way to know how many bytes are in the buffer? 2) are there always complete responses in the buffer (meaning I could ...
- Fri Apr 27, 2018 2:48 pm
- Forum: GTT Series
- Topic: I2C Read with GTT43
- Replies: 24
- Views: 32735
Re: I2C Read with GTT43
OK. I understand... I think. I think you are saying that I can setup things with GTT designer and set the communication to none... then after the system boots, I can send an I2C command to set the channel to I2C Or I can read the data until the buffer is clear. Is there a command to clear the I2C bu...
- Fri Apr 27, 2018 9:54 am
- Forum: GTT Series
- Topic: I2C Read with GTT43
- Replies: 24
- Views: 32735
Re: I2C Read with GTT43
Is there an I2C protocol timing diagram in some document? If so I haven't been able to find it... but I would love to see it.
- Fri Apr 27, 2018 9:53 am
- Forum: GTT Series
- Topic: I2C Read with GTT43
- Replies: 24
- Views: 32735
Re: I2C Read with GTT43
Yes... but I guess that I dont understand why having or not having screens in there would impact the I2C interaction.
In other words... it seems to me that I would be able to do a "protocol version" read regardless of anything?
In other words... it seems to me that I would be able to do a "protocol version" read regardless of anything?