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DK-TM4C129X: SPI transimission error

Frank M
Intellectual 1985 points

Part Number: DK-TM4C129X

Dear all,

my customer is facing an issue with TM4C SPI port. using the SPI via API leads to a wrong transmission:

They are transmitting three bytes and the first transmitted byte in master mode is not correct on the MOSI line.

What is wrong or must be changed?

Please find attached the Project zip file and the Log-output.

3630.spi.zip Project zip file

  • 0
    TI__Guru**** 244400 points

    Hello Frank,

    I was able to reproduce the issue with the code and the instructions that followed in the code.

    The issue is with the missing connection for the FSS signal. On adding the code for FSS for the slave side and making the connection on the board, the transactions proceed as expected.