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DMA SPI controlled SSEL signal using linked list on LPC54102

Question asked by Praveenth Pra on Jul 5, 2017
Latest reply on Jul 6, 2017 by jeremyzhou

LPC, configured as master, is communicating using DMA and SPI to a peripheral.

Master passes a command to the slave and the slave returns some data.

I use linked list descriptors for the whole communication.

 

If i want to send a second command from the master, the peripheral requires a SSEL signal.

Using DMA (with linked list) and setting the peripheral registers for a new SSEL signal seems to not work

(Remark: Using DMA (with linked list) and setting the peripheral registers for "end of transfer" bit does work)

 

Are there any restrictions regarding controlling the SSEL signal via linked list in a DMA transfer.

Are there any other solutions to control the SSEL signal?

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