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Can't DMA to off-chip Memory

Question asked by pmt on Feb 15, 2014
Latest reply on May 1, 2014 by pmt

Hello,

 

I have written an DMA SPI driver in MQX (but not MQX's driver), however I can't get the DMA to write to externally configured (FlexBus) SRAM.  Writes to internal memory works fine.  I'm using the K60 processor.

 

I'm sure there is a protection bit somewhere preventing this, but given the number of peripherals that could effect this (SIM, Flexbus, DMA, Crossbar Swtich, MPU, AIPS), I wanted to put this question to the group in the hopes someone would just know.  I have FBSEL set to allow off-chip code and data access.  Non-DMA off-chip access works fine.

 

Thanks!

PMT

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