LPC3250 SSPI DMA function

Discussion created by lpcware Employee on Jun 15, 2016
Content originally posted in LPCWare by tim yu on Wed Jun 03 19:32:16 MST 2015
Hi all,
   I used SSP0(SPI mode) with DMA function to get ADC data. If I only set the SSP0 for

SSP0 RX DMA function and CPU set the SSP0DR to get clock and SSEL signal on SPI bus

for each 16bits serial data, eg 16clocks plus a low and high of SSEL. My problem is

that If I use SSP0 RX/TX DMA function with SSP0 transmit and receive of GPDMA functions,

I can not get low and high signal of SSEL for each 16bits data. The result is just only one

low and high of SSEL signal for while datas.

    I would like to know the LPC3250's SSP TX DMA could support the high and low  of the

SSEL for each data word or not!

   Thanks for the answer.