I'm looking for some sample code or good documentation for unloading a USB endpoint to SRAM with DMA. The App note "getting started with DMA" is good but doesn't cover USB endpoints, the component data sheets also pretty much leave out this topic or just gloss over it with little explanation. The DMA Wizard doesn't support USB. Any suggestions on where else to look? Thanks

I was going through the USB_LoadInEP() API. It has code for the Auto DMA and Manula DMA mode of data transfer. Code for setting up DMA for USB Endpoints is present there. Sad that Cypress has not documented this anywhere.

When *NOTHING* helps and none of the gurus had an answer yet you may always create a case (support -> Technical Support -> Create a Case) that will be answered by a Cypress employee who usually have an excellent technical background.

Give it a try (and post the solution here for us)

Bob

 There is a reason why it is not highlighted anywhere. The source of data for USB can only be SRAM. ANY OTHER PERIPHERAL can not be used as direct source of data for USB. If for example you intend to transfer data from ADC to USB, you have to use an intermediate SRAM buffer as a common place where ADC dumps data to and USB takes data from. We have a new App Note coming up which does exactly this. 

Hi U2,

I'm very interested in this application note because it would describe exactly what I like to implement. Is it already available?

Best Regards

Walt