i.MX RT Crossover MCUsのトピックRe: LPSPI interfacing of MIMXRT1020 EVK with PCF2129 using eDMA.

LPSPI interfacing of MIMXRT1020 EVK with PCF2129 using eDMA.

emb01_jtronix — Mon, 16 Mar 2020 10:21:48 GMT

I am trying to interface Evk board with PCF2129 USING LPSPI in eDMA mode. I have used cmsis_lpspi_edma_b2b_transfer example as reference , instead of another Evk board as mention in readme document i am trying to write and read data to/from PCF2129. I am getting all the signals(clock, chip select, MOSI) correctly on DSO but i am not getting any signal on MISO pin so I can't read data.

What should I do to read data using LPSPI in eDMA mode?

Re: LPSPI interfacing of MIMXRT1020 EVK with PCF2129 using eDMA.

victorjimenez — Thu, 19 Mar 2020 01:00:18 GMT

Hello,

Did you make some modifications to the example? Keep in mind that this project was made to work with two boards, so if you want to interface a PCF2129 you need to make some changes. I highly recommend you to refer section 9 of the PCF2129 datasheet to see how the data transmissions are made. https://www.nxp.com/docs/en/data-sheet/PCF2129.pdf

Best Regards,

Victor