TMS320F280034: How do I use DMA with EPG

NEIL SINGER

The have EPG code that works but it takes 1 second to transfer its data. I want to use DMA so I can load all the data in a buffer and have the EPG unit send the data out automatically.

Please suggest how use DMA with EPG so I can send all of the data to the EPG unit without having to wait for each transfer. Is there an alternative way to do this without using DMA?

Regards

over 2 years ago

0 NEIL SINGER over 2 years ago

Expert 1190 points

I can imagine using the DMA to load the EPG register and then having an ISR send the data but I was hoping to not involve the processor so that I don't have to coordinate the Interrupts with other interrupts in my code. I could even use an EPWM to trigger individual bursts with an ISR, but again, this uses the processor and can cause issues with other software. I am ideally looking for a way to configure the EPG and DMA to operate independently -- I load the data and trigger the send operation which is send over the course of a second.

+1 Pramod P over 2 years ago in reply to NEIL SINGER

TI__Expert 5430 points

Hi,

DMA does not have access permission to the EPG register space. This is indicated in the "EPG Registers" section under the EPG chapter of the TRM. I am afraid you don't have a choice to not use the CPU(processor) for your purpose.

Hope this information helps.

Thanks & Regards

Pramod

0 NEIL SINGER over 2 years ago in reply to Pramod P

Expert 1190 points

Pramod,

Thank you for the reply.

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TMS320F280034: How do I use DMA with EPG