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AWR1642: AWR1642 SPI master and slave

user6149625
Prodigy 20 points
Part Number: AWR1642

Hi, engineer TI,

Recently, we are debugging two AWR1642 for SPI communication. One of them can send data as master, but 1642 as slave cannot receive correct data. All the data read are 0xFF.Where to look for this problem.

  • 0
    TI__Mastermind 21025 points

    Hi,

    Please take a look at the SPI driver's HTML documentation: (double-click this file in your SDK folder)

    C:/ti/mmwave_sdk_02_01_00_00/packages/ti/drivers/spi/docs/doxygen/html/index.html

    This document discusses how to handle slave and master modes. For slave mode, namely:

    • The SPI protocol does not account for a built-in handshaking mechanism and neither does this SPI driver. Therefore, when operating in SPI_SLAVE mode, the application must provide such a mechanism to ensure that the SPI slave is ready for the SPI master. The SPI slave must call SPI_transfer() before the SPI master starts transmitting. Some example application mechanisms could include:
      • Timed delays on the SPI master to guarantee the SPI slave is be ready for a SPI transaction.
      • A form of GPIO flow control from the slave to the SPI master to notify the master when ready.

    If you are accounting for these things and still don't see correct data, you should check that the pinmux is set correctly for SPI. There are examples of this in the SPI driver test code.

  • 0 in reply to db_woodall
    Prodigy 20 points

    Hi，:

        Thank you for your answer. I have solved this problem, but I have another problem.

           How to send data to the master device from  slave device, the slave device clock needs to be provided by the master device, so it is necessary to keep reading in the master device to generate the clock? and whether there are registers to set the clock generation and stop.

  • 0 in reply to user6149625
    TI__Mastermind 21025 points

    Hi, sorry for the delay. Have you found a solution to this issue?  If not, please open a new thread.

    Thanks, dave