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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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OK To DMA Directly To Queue Memory?Posted by Richard on October 19, 2012 Hello All, Probably been discussed before - but - is it 'OK' to DMA directly to a Queue? Or is this a no-no? Thanks, John W. Reply Link Edit Delete Attach Richard Damon 2 days ago What address would you point the DMA to? The handle points to the control structure, which is opaque to user code. Even if you had the pointers there is no way to indicate that a block of memory is in the process of having data filled, it is either empty, and subject to being written to by someone inserting data, or is full and subject to being read. I suppose you could copy the queue code and replace the memory copy with an immediate dma transfer that would be "instantaneous" (i.e. all data is sitting in a device buffer, and just using DMA to place it into the queue instead of copying the data from a normal memory buffer. RE: OK To DMA Directly To Queue Memory?Posted by Richard on October 19, 2012 The above was lost when the forum reverted back to the old software, so I have manually added it in a single post for reference here.
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