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DMA read from SDRAM

Question asked by Jeff Hane on Apr 29, 2019
Latest reply on May 9, 2019 by Alexis Andalon

 I am currently using a K28 board to prototype out device.   I receive data over USB which is written to a buffer and eventually I use DMA to write this buffer over QSPI to an FPGA.   When the buffers are located in SRAM this works fine but I need to add some additional larger buffer.  So I enable SDRAM and use buffers allocated there.   I can receive the data over USB and by examining the SDRAM I can see the data is written successfully.  However, for the DMA from SDRAM to QSPI  I never get the DMA complete notification.  

  Since USB can write to SDRAM I assume SDRAM is configured properly so I'm not sure what to look at.  Anyone done this or have any ideas?

 

thanks,

jeff

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