Edge triggered DMA losing first byte

[HuEl_264296]

 I want to create an SPI component which leaves a small gap between bytes. To achieve this, I am using edge triggered DMA to transfer bytes to the SPI component. A PWM component is used to create the edges. I can vary the PWM period to vary the inter-byte spacing.

       

It all works, except that the first byte is always missing! When I try to transfer the following bytes: {1,2,3,4,5,6,7,8} I see {2,3,4,5,6,7,8} come from the SPI component.

       

When I was using the usual level triggered DMA, I never saw this problem.  What am I doing wrong? Please see attached waveform.

       

Many thanks

   

Hugo

[HuEl_264296]

 And here's the workspace bundle:

[HuEl_264296]

 Let's try again ...

[HuEl_264296]

 Argh! Why is this forum so bad? It won't let me post the workspace bundle.  I'll e-mail it to anyone who wants it.

   

Hugo

[Bob_Marlowe]

Keep calm, you're not the only one here gnawing nails about the &$§$&!! forum software.

   

Use internet explorer or firefox to post the zip-file.

       

Bob

[HuEl_264296]

OK, trying again with Firefox.

[HuEl_264296]

Unbelievable. Still doesn't work!  Hello Cypress? Can you fix this terrible forum please? Everyone else's forums are at least two generations ahead. Even open-source forum software is better than this joke.

       

We should all just move to http://electronics.stackexchange.com/

   

Or to http://area51.stackexchange.com/proposals/50195/embedded-systems when it comes back.

       

I've uploaded the file to my Google Drive: 103-000-2006-01.cywrk.Archive02.zip