MPC5554: Non-trivial DSPI-DMA transfer

[vyacheslavkruto]

Is it possible to configure DSPI-DMA mode such way that allows to automaticaly transfer several KB data array from a memory location  outside over SPI bus ?

So, when SPI TX FIFO would be full, DMA will stall and wait till an empty entry in FIFO after word shifting out would be available to continue DMA operation.

Thanks.

[petervlna]

[We are sorry for delayed answer, this question was originally placed in box which was not monitored by our team]

Hi,

Yes you can achieve such functionality with DMA.

When FIFO is not full SPI will request DMA transfer.

Example code can be found here:

https://community.freescale.com/message/535094#comment-535094

Peter