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New bench scope - Fnirsi 1014D, 7", 1GSa/s

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pcprogrammer:
Hi Joseph,

here you can find some screen captures of what the communication between the FPGA and the "special ic" looks like: https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/msg3583988/#msg3583988

To test the "special ic" with a dedicated I2C interface you could try a read of address 0. It should return multiple bytes of data.

Cheers,

Peter

joseph4511:
I guess firmware in it is gone. No response from IC when i connect it to pc with I2C to usb adapter.

pcprogrammer:
I wonder if there is a way to identify the chip. The fact that the "I2C" clock is ~820KHz makes it harder for bit banging, so a tiny85 (AVR based) might be to slow.

It intrigues me. I will take a look at the code and see if it is possible to remove the communication with the "special ic" from it, without it taking a lot of time.

joseph4511:
Be careful, that crap tends to be broken. I dont want you to brick your device.

Edit: Can you compare your fpga rom file with file of mine? I did not applied heat there but im curious. Also found a Se98 datasheet, pinouts match maybe you can take a look.

pcprogrammer:

--- Quote from: joseph4511 on May 04, 2022, 08:41:34 am ---Be careful, that crap tends to be broken. I dont want you to brick your device.

Edit: Can you compare your fpga rom file with file of mine? I did not applied heat there but im curious

--- End quote ---

I'm not touching the hardware :) Just looking at the firmware. It is looking back in what I did many months ago. As said the code is similar to the 1013D code, which I almost fully reverse engineered.

The code does an initialization of the "special ic" and it most likely hangs while waiting for a response. There is no timeout on that code. So removing the call to the initialization should allow the code to get a bit further. It will be a try and error game.

For comparing the fpga rom I have to extract the data from mine first. That is a bit of a pain in the bum to do, so maybe later.

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