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Original question:

TMS570LS1224: SPI communication

TMS570LC4357: TMS570LC4357 spi3 can't communicate with LTC6813, SOMI line nothing

xhf xu
Prodigy 30 points
Part Number: TMS570LC4357

hello, I saw 2 link regarding by using TI chip spi to communicate with analog device LTC6811 and LTC6813, all got issue with SOMI no response, now I am using TMS570LC4357 SPI3 to communicate LTC6813, also got same issue, does any body solved the issue? thanks!

e2e.ti.com/.../2165932

  • 0
    TI__Guru**** 196246 points

    Hello Xu,

    There is no HW issue with SPI SOMI. I did not do SPI communcation test between TMS570 and LTC68x, but I did some test between TMS570 SPI and other SPI slave devices, and I also did loopback test, and don't see any problem. 

    What is your specific questions regarding SPI3? 

  • 0 in reply to QJ Wang
    Prodigy 30 points

    Hi, QJwang

        thanks for your fast response! all loop test (digital and analog) no issue! 

    today I finally solved the problem! due to some clk delay  and CS timing related ! now can receive correct 

    data from SOMI line....thanks a lot! I will close the thread!