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Original question:

MSP430F5234: How can I connect SDA and SCL to the BSL pins P1.1 and P1.2 if I want to use I2C BSL?

MSPM0G3507: Change BSL pin or desactivate it (MSPM0G3507)

Solofo BUSCOTIN
Prodigy 40 points
Part Number: MSPM0G3507

Tool/software:

Hello,
I am implementing PWM on a project on several PINs of the microcontroller. On all it works except on two PINs (PA0 and PA1) which have the following description “Default BSL I2C_SDA” and “Default BSL I2C_SCL”. Is this the reason why it doesn't work? I've checked my configuration against a sample code and everything seems fine.
Is it possible to change the BSL PIN or even disable BSL?
Thanks in advance.

  • +1
    TI__Genius 16000 points

    Hi Solofo,

    Are you using this on custom hardware, or an MSPM0 Launchpad?

    I ask because pins PA0 and PA1 are open drain pins, meaning they can only output low or be left floating by default. To drive an output high with an open drain pin, you must connect pull-up resistors to the pins. The launchpads have the pull up resistors, custom hardware is of course up to your design.