EPCS : read electronic signature

Etienne,

Have you tried single-stepping through this code to find out what is failing?

In any case, the command that determines the flash's "silicon ID" is contained within the very function you're referring to:

/* Send the RES command sequence */
  flash->silicon_id =
    epcs_read_electronic_signature(flash->register_base);

Best of luck!

- slacker

I thank you for your answer, but It doesn't work in my project. When I call the function, the software never goes out ? Do you have an idea ?

I thank you again

--- Quote Start ---

originally posted by slacker@Nov 12 2005, 06:52 PM

etienne,

have you tried single-stepping through this code to find out what is failing?

in any case, the command that determines the flash's "silicon id" is contained within the very function you're referring to:

/* send the res command sequence */
  flash->silicon_id =
    epcs_read_electronic_signature(flash->register_base);

best of luck!

- slacker

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--- Quote End ---

Etienne,

I&#39;m sorry, but I don&#39;t know what you mean by "the software never goes out".

Do you mean that this software is never called from within the alt_sys_init() function? Do you mean that the software fails to find a silicon_id? Or something else?

Please elaborate.

- slacker

We&#39;ve struggled with a similar problem and so I&#39;d be interested in knowing what you&#39;ve found.

I&#39;ve put breakpoints in alt_epcs_flash_query where it does the call:

flash->silicon_id =

epcs_read_electronic_signature(flash->register_base);

and have seen rather intermittent results, i.e. sometimes it reads the signature okay and sometimes it doesn&#39;t. It often changes its behavior when I re-download the .sof file. We are running on our own hardware with a 2C20-C8. We are using a STM serial flash M25P64V6G. We have Quartus 5.1 and Nios 5.1.

We&#39;ve looked at the read sequence on a scope and when it fails it looks .... funny, it gets 0 back for the signature and other random stuff. The read signature sequence should be 40 clocks. They are being done a byte at a time which makes sense as they are coming out of a SPI controller but there is a long time between bytes, about 10 us, the clock is 12.5 MHz.

Has anyone experienced similar problems?

Mike

Did you specify a reference designator in your SOPC configuration? You need to run mk_target_board as detailed here...

http://www.altera.com.cn/literature/ug/ug_..._programmer.pdf (http://www.altera.com.cn/literature/ug/ug_nios2_flash_programmer.pdf)