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[FAQ] J7200XSOMXEVM: How to change the console for keywriter

Part Number: J7200XSOMXEVM

The default console used by the TI keywriter is MCU_UART. In case that MCU_UART is not brought out on the custom boards
how can we switch the keywriter console to other UART instances for example MAIN_UART0

  • Hello,

    Yes. The default console used for keywriter software is MCU_UART. It is possible to switch to different UART instance as console.

    MCU_UART is initialized by ROM Code and hence it is used directly without configuring in the R5 SPL application of the keywriter binary.
    Hence we need to re-order the initial prints & add prints only once the the UART is turned on & clocked. Here is a way to enable MAIN_UART0 as the console for UART:

    Apply the patches on PDK folder of the RTOS SDK.

    cd $PSDK_RTOS
    git am keywriter-console-switch-main-uart0./*
    cd packages/ti/build
    make keywriter_image BOARD=j7200_evm

    Note: The same could be used for other j7xxx versions as well by making similar changes in the respective j7xxx files in the keywriter folder.
    This is tested on 8.5 SDK.

    Best Regards,