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MSP430F6736A: Bootloader and LED drive config

Suresh B
Prodigy 10 points

Part Number: MSP430F6736A

Tool/software:

Hello TI team

I would like to configure pins 41 and 42 for dual purpose

1. Primary function: To drive LED's

2. Secondary function: To flash code through bootloader

What hardware precautions should I take for this config.? Also my colleague suggested that flashing using bootloader can be possible on blank ECU initially only once. For 2nd time flashing, first ECU should be ERASED using debugger. Also what should be the state of pins- pulled high / pulled low/ flolating? We need suggestions and support

  • 0
    TI__Mastermind 28835 points

    Hi Suresh,

    Suresh B said:
    What hardware precautions should I take for this config.?

    That is little confused.

    The LED functions means what you will let it work as GPIO output, and drive current on this line.

    While, the second function means it will be used as UART:

    This is no a good idea that you connect a LED into the UART line. It drives additional current in the line and might have impact on the communication stability.

    I have NOT used this in any case.

    Suresh B said:
    For 2nd time flashing, first ECU should be ERASED using debugger

    There is no limitation for second flashing, you can always trigger the BSL by the hardware invoke.

    Suresh B said:
    Also what should be the state of pins- pulled high / pulled low/ flolating?

    For BSL, it will be configured by the hardware, no need additional configuration on the pull-up/down resistance.

    You need a special signal to let the device entry the BSL (hardware invoke).

    B.R.

    Sal

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