GM328 transistor tester MCU firmware update

[John M. (sdancer75)]

I tried to re-program a problematic GM328 that was not possible to 
calibrate.

https://www.youtube.com/watch?time_continue=1&v=JCP7oWG3D3w

No matter what mega328_GM328 version I used from

https://www.mikrocontroller.net/svnbrowser/transistortester/

I always get a white blank screen.  The fuses I used are: lfuse=0xF7 
hfuse=0xD9 efuse=0xFF

I even tried the versions below without success.
GM328_EZM_v1.12k_r464_EN.zip
GM328_EZM_v1.12k_r508_EN.zip
GM328_EZM_v1.12k_r541.zip

Any recommendations?

Regards,

[K. S. (the_yrr)]

these boards are available with a number of different displays. looks 
like your new firmware doesnt support your display.

you could read back the flash and test it against the file you wrote, 
but i dont expect any differences.

do you know what display(controller) you have? if its one of those from 
ebay or aliexpress you might find the information on the back of the 
display, if not it might also be available on the sellers page.

then you need to find firmware for that display(controller). if you cant 
you need to get the source (this project should be open source) and 
modify one so that it supports your display. Also check if the pins 
connected to the display correspond to those in the source.

next time make a backup of the flash if its not read protected before 
you try to upgrade, if it is a chinese version with a custom display you 
will have to write your own code to get it working, but its much more 
likely that you just use the wrong version and there is already one 
working.

[Horst O. (obelix2007)]

Hi John,

... tray out the version "mega328_color_kit", i have tested with 
GeekTeches GM328A, i think, it is the same display and works fine.

Regards

[John M. (sdancer75)]

Horst O. schrieb:
> Hi John,
>
> ... tray out the version "mega328_color_kit", i have tested with
> GeekTeches GM328A, i think, it is the same display and works fine.
>
> Regards


Hi, I will try it and I will let you know.

BTW, the display has the following ICs. A) TI Hex Inverting Buffer and 
Converter (7CA676M) CD4050BM G4 and B) AMS1117 DROPOUT VOLTAGE REGULATOR 
and an SMD resistor. Nothing else.

[John M. (sdancer75)]

Horst O. schrieb:
> Hi John,
>
> ... tray out the version "mega328_color_kit", i have tested with
> GeekTeches GM328A, i think, it is the same display and works fine.
>
> Regards

It worked !!! I am very glad! Thank you for your precious advice !!

Is this display ST7735 compatible? This pinout 1-8 is the same as the 
following table (TFT display pin)?

https://cdn.instructables.com/FD6/5BW7/IJ3763UJ/FD65BW7IJ3763UJ.LARGE.jpg?auto=webp&width=580

[Horst O. (obelix2007)]

John M. schrieb:
> Is this display ST7735 compatible? This pinout 1-8 is the same as the
> following table (TFT display pin)?

... i think so.

If you need more information about the TT, in this Forum is the 
(Mega)threat Transistortester AVR. The description in many languages you 
can find here: svn://mikrocontroller.net/transistortester

Best regards

Horst

[Andres C. (andres_c)]

Good afternoon friends. I have a problem with that tester I get the bad 
atmega 328. and I have looked for many parts but I can't find the 
filmwarer of said I read that you solved it. Look for the one that I 
recommend to you jhon: m but it sends me to a page where it does not 
give me to download the .HEX please collaborate with me if it is not 
much trouble. Thanks in advance

[Horst O. (obelix2007)]

Hi Andres,
... you can find the files here:

https://www.mikrocontroller.net/svnbrowser/transistortester/