DMA to Shared RAM

Hi James,

It'll be great if you could provide some more details about the issue you are facing and the device name which you are working on.

Regards,

Vivek Singh

im using the f28m35h52c1.  im reading an adc buffering with dma to shared ram.  sending data to usb peripheralo

I'm on my cell phone and its hard to type but to be clear  want to send the data in the shared ram out the usb with udma

James,

By seting up the descriptor of uDAM channel, associated with USB, with proper source and destination address, you should be able to get this woking.

Regards,

Vivek Singh 

Ok, thanks.  What about setting up the DMA to xfer from ADC to the shared memory of the two cores.  Is that possible?  What do i need to do?  Again is it the right linker script? 

Hi James,

Yes, you can setup uDMA to do data tranfer from ADC to Shared RAMs but you need software to trigger the start of transfer because ADC trigger events are not mapped on uDMA.  You can use the SW channel of uDMA for this purpose.

Regards,

Vivek Singh  

I was trying to use DMA, not uDMA, to xfer data to the shared RAM, but nevertheless I figured it out.  My next question is there a way to configure the linker script to have a multiple blocks of RAM map to a single buffer