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CCS/TMS570LS0714: SPI Master Slave Communication

Ermine Jose
Prodigy 50 points

Part Number: TMS570LS0714
Other Parts Discussed in Thread: HALCOGEN

Tool/software: Code Composer Studio

I have configured SPi port 3 as the master inorder to receive data from a slave. With Oscilloscope I'm able to observe the CLOCK, CHIPSELECT , MOSI and even MISO signal. But my buffer when i put breakpoint and check through CCS is not reading any data. Can you guide me through the Master-Slave Configuration that needs to be done in HalCoGen, and what function that needs to be called in CCS. so that i can cross check with my code. 

Thank you,

  • 0
    TI__Guru**** 199386 points

    Hi Ermine,

    The HALCoGen has an example for SPI master-slave communication. HALOCGen-->Help-->Help Topics-->examples-->example_spi_Master_Slave.c

  • 0 in reply to QJ Wang
    Prodigy 50 points

    Hy QJ Wang, 

    I have done that, the trouble is I received the SIMO signal from LTC 6812 which i use to read voltage of cells of a battery. But I'm not receiving any data when i put a breakpoint in the function call of spiSendandReceive function ( in CCS). Could you please help what might have went wrong in calling the spisendandreceive function and why i am not able to read the miso signal in CCS. Any help would be appreciated. 

    Thanks

     

  • 0 in reply to Ermine Jose
    TI__Guru**** 199386 points

    Hello,

    LTC 6812 is a SPI slave, and doesn't generate SPI clock. For reading data from LTC6812, the SPI master needs to send command, and dummy data to LTC68x. The size of the dummy data should be the size of returned data from LTC68x's.

    Please refer to LTC68x datasheet for the details of the communication protocol.

  • 0 in reply to QJ Wang
    Prodigy 50 points

    Hi Wang,

    yes, SPI doesn't generate clock. I'll check the function parameters.

    Regards,