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GM328 transistor tester MCU firmware update

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sdancer75:
Hi,

I bought a GM328 transistor tester that can't be calibrated. It stucks at the "short probes" stage. Anyway, I decided to update the MCU firmware.

I connected the ATMega328pu to my breadboard and I double checked the connections with my DMM. The AVRdude always return the following error :

D:\temp\GM328\EN>avrdude -pm328p -cUSBasp -B4 -Pusb

avrdude: set SCK frequency to 187500 Hz
avrdude: warning: cannot set sck period. please check for usbasp firmware update.
avrdude: error: programm enable: target doesn't answer. 1
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.


avrdude done.  Thank you.


I even tried to connect an external crystal but without luck. What seems to be wrong here? My OS is Win10/64Bit and AVRdude is v5.10

Regards,




sdancer75:
An 8MHZ crystal solved the problem !!! :phew:

Best Regards,

sdancer75:
Also to note, the GM328 could not be calibrated because it had wrong resistors. I replaced them, and it worked like a charm.

akcoord:
could you plz
mention the steps to do that and explain how to update and pass the fuse thing i have mine and i want to update using the usbasp but do not know which software to use  and how to 
best regards
i hope you still follow

Fuzzy Star:

--- Quote from: akcoord on November 29, 2022, 02:05:20 pm ---could you plz
mention the steps to do that and explain how to update and pass the fuse thing i have mine and i want to update using the usbasp but do not know which software to use  and how to 

--- End quote ---
The info that you are looking for is probably in this thread:
https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/
You can do search there.

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