TMS320F28335: Controlling pins with XINTF and DMA

Edvin,

Sorry for late reply. 

Edvin Hjortland said:

What I am trying to setup is a timer that triggers the DMA to update the output pins with data from a predefined data table in RAM. Can this be achieved by the XINTF module?

Yes, this should be possible. 

Vivek Singh

Thank you for your reply.

I'm struggling to set this up. Given that the XINTF interface is primarily a memory interface, I don't see how I can make the GPIOs hold their values until the next DMA transfer updates the GPIOs to a new values. It seems that the GPIOs will only hold the desired values during the write strobe period. Am I missing something here? Do you have any pointers on how to achieve this?

Regards,

Edvin

Edvin Hjortland said:

It seems that the GPIOs will only hold the desired values during the write strobe period. Am I missing something here? Do you have any pointers on how to achieve this?

You are correct. You can change the EMIF timing to make these strobe timing bigger but after that these pins will go to the default value. 

Vivek Singh