LPC55S69 - Simple example of SCTIMER triggering SPI DMA transfer

[IanMcCarthy]

Hi All,

So many options, so little time...

Does anyone have a simple example where a free running SCTIMER will trigger a single TX byte/word DMA transfer on an SPI interface.

We have SCTIMER running generating PWM and we have SPI DMA running using various linked descriptor strategies...but we can't at the moment get an SCTIMER match to trigger a DMA transfer.

Any help/pointers would be gratefully appreciated.

Thanks.

[xiangjun_rong]

Hi,

It is okay to use SCTimer to generate fixed period signal to trigger DMA, but we have not example code for the solution.

For your application that you use SCTimer to trigger DMA, you have to configure the SCT DMA request 0, which is set up in DMAREQ0,

You have to set up the Input Mux register  to generate trigger signal to trigger DMA channel

Pls have a check if you set them or not.

BR

XiangJun Rong