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Getting issues in using SPI mode in TSM320f28035 micro-controller

Kamal Sandeep
Prodigy 100 points

I have been using TSM320f28035 for one of my project. I have been using SPIA  for communication with 2 boards which has the same controller. The hardware connection what is used is as follows:

                   MOSIA(1st board)  - MOSIA(2nd board)

                   MISOA(1st board) - MISOA(2nd board)

                   SCLK(1st board) - SCLK(2nd board)

                   STINVE(1st board) - STINVE(2nd board) This is strobe pin.

When I transfer data from master to slave, the data is well received by slave. The waveform also seems to be fine i.e proper digital signals.

The issue is when slave transfers the data to master. The waveform is as attached.

The data what is being captured by master is not a valid data. I checked if there is some capacitor or register on the board. But the connections seem to be OK.

Please note that I have been using 4 wire SPI communication in my application.

Regards,

Kamal

  • 0
    Guru 30330 points
    Kamal,

    Have you configured the SPI modes to match between the master and slave? Is it possible that the Master is trying to sample the data input on the incorrect edge? Please check your Phase and Polarity settings on each MCU.

    The scope shots that you shared appear to be entire transactions. Can you zoom into a single transmission? I would like to see what your slave data out looks like on the scope.

    Thanks.
    Mark
  • 0 in reply to Mark Labbato
    Prodigy 100 points

    Hi Mark,

    Thanx for your reply.

    Actually the issue was with the hardware. I had not removed a capacitor from MISO pin.

    After removing the capacitor it works well. 

    I am not sending the image captured in the scope as required by you as the issue is resolved.

    Regards,

    Kamal

  • 0 in reply to Kamal Sandeep
    Guru 30330 points

    Glad to hear that you have resolved it. Don't hesitate to post a new thread if you run into anything new.

    -Mark