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Regarding the TX DMA in AD9371 reference design

Question asked by filabrasil on Aug 23, 2017
Latest reply on Sep 4, 2017 by filabrasil

Hi, I'm currently running the AD9371 No-OS software with the ZC706 board. Based on the behavior of the transmitter using the reference no-os code, it repeatedly transmits the data loaded in the dac_write_custom_data function similar to a cyclic dma configuration. The reference headless.c file however sets the dma type to DMA_PLDDR_FIFO which I have no idea what it does. Where can I find information about this mode of DMA?

 

What I'm trying to do is to time stamp the exact time when the transmitter is sending a frame (hopefully without much modification) so I'm planning to test whether the DMA_PLDDR_FIFO raises periodic interrupts every end of cyclic transfer. If it doesn't, I would like to know how this dma type work so please direct me to any documentation.

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