Issue with PS/2 keyboard on Terasic DE0 Board about apple-one HOT 22 CLOSED

Hi @trcwm,

attached please find my pof-file.
Yes I did a verify and everything seems to be ok.

apple-one.zip

Regards,

Denny

from apple-one.

Hey thanks for reaching out. I'll yield to @trcwm as I don't have a DE0 so not sure how it's setup.

He'll be able to help I'm sure.

from apple-one.

Hi @dennyalbert,

I haven't seen this issue before. My A1 boots correctly when I flash the configuration files.
Do you verify the flash contents after flashing? Could be your config flash is corrupt.
The other possibility it that Quartus does not produce the correct .pof file.
Can you attach your .pof file?

/Niels.

from apple-one.

Your .pof file works perfectly on my DE0 system. I'm not sure how to help you further I'm afraid.

/Niels.

from apple-one.

I have now tested the workflow under windows without success. Only to rule out an error with the operating system. Otherwise I use linux.

Could I have a problem with the hardware?
I have tested some examples, everything has worked without any problems.
If there is a problem with the memory, should not the verify lead to an error?

Is there a possibility to read the memory bit-by-bit and compare that with the pof-file?

from apple-one.

Now I have read the configuration from the board and there are many differences between the two files. How can that happen, shouldn’t be the files identical?
Attached the two files.
read&written.zip

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Have you erased the flash chip before programming? What does the blank check say?

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Yes I erased the flash chip before programming.
Do you see any differences between the files when you read a configuration?
Which devices are involved in normal operation, the EPCS4 and the FPGA itselves? Probably the EPCS4 is broken? Unfortunately, this chip is no longer available.

Output blank check:
Info (209020): Blank-checking device 1
Info (209018): Device 1 silicon ID is 0x12
Info (209011): Successfully performed operation(s)
Info (209061): Ended Programmer operation at Tue Apr 17 22:02:07 2018

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I had the opportunity to test on a second Terasic DE0 board and have the same issue.
I tried to establish a connection via the serial interface, unfortunately without success. Attached two screenshots. Do you have any idea why the connection does not work?

from apple-one.

Are you using a RS232 compliant serial to USB cable? A normal TTL-level cable won't work.

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I usually work with microcontrollers and have assumed that the communication works via TTL-level.
I can connect the board directly to the RS-232 interface of the computer?

A question regarding my first issue with the keyboard. Where is the switch when you power on the board, in RUN or PROG position? The pof-file is already loaded.
When I power on the board in switch position RUN I have the issue as already described. When I power on the board in switch position PROG and switch to RUN erverything is fine. Is this the normal operation?

from apple-one.

Yes, the DE0 has a level translator (unlike many other boards) and it is directly compatible with an RS232 COM port.

I power cycle the DE0 when changing the position of the RUN/PROG switch. I have never seen it misbehave in either state.

When I power up in the PROG state, the DE0 does nothing. When I power up in the RUN state (and the flash has been programmed), my A1 works as intended.

from apple-one.

This is really annoying that two boards behave differently.
Just to clarify, do I only need to load the pof-file or do I have to do some other configurations like for unused pins?

from apple-one.

To my knowledge there are no additional requirements to make the A1 run from config flash.
You board seems to work ok if the configuration was loaded directly from the PC. My best guess is that your config flash is not working properly.

from apple-one.

This was also my first guess that the config flash is the problem. But the same issue with two new boards? Unfortunately the EPCS4 is no longer available.

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If two new boards have the same problem, it's not the EPCS4.

Try the attached .pof file - that's the one I used.
apple-one-DE0-pof-sof.zip

from apple-one.

Unfortunately I have the same problem with your files.

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Now I have built a cable for the serial port as described in the picture. I can receive characters but not send. Is there something special to do? Can the PS/2 keyboard stay connected?

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If I'm not mistaken, the code will only transmit the data sent to the VGA to the UART.
The functionality to get the keyboard data from the UART is disabled by default.
You have to set the 'ps2_select' value in apple1_de0_top.v to zero.

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I'm getting closer to the problem. The keyboard (Fujitsu KB400) itself seems to be the problem.
If I supply the keyboard with voltage prior to the FPGA everything works.
The same effect occurs if I press and hold the reset button (Button 0) before switching on and release afterwards.
Any ideas how to fix the problem?

from apple-one.

Now I was able to test with an old AT keyboard (PS/2 adapter) and can confirm my guess that the Fujitsu keyboard was the problem.

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Glad you solved it! 👍 how annoying 😄

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