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MSP430FR2355: MSP430fr2355

Adnan Kirkire
Prodigy 20 points
Part Number: MSP430FR2355

Hello There,

We are using MSP430fr2355 in one of our motor drivers and BMS communication application.

This BMS works on one wire communication hence we want to connect the BMS on GPIO.

As per BMS requirement, we need to configure the GPIO pin as an open drain and internal pulup.

So can you please tell me whether MSP430fr2355 supports open drain and internal pullup on GPIO pin?

If yes then please share a sample code for it.

Adnan

  • 0
    Guru 95555 points

    The MSP430 doesn't provide true open drain pins. However, you can mimic most of their properties by setting PxOUT appropriately (low) and manipulating PxDIR (output low, input high). 

    The Software I2C appnote (SLAA703A) illustrates this. The code (via a link in the PDF) was written for an FR2111, but I expect it will build/run with only changes to the port pin choices: It supposes external pull-ups.

    https://www.ti.com/lit/an/slaa703a/slaa703a.pdf

    Internal pull-ups are available via the PxREN register [Ref User Giode (SLAU445I) Sec 8.2.4]. Pull-up vs -down is controlled by PxOUT, so to use these with software I2C (or OneWire) you need to disable the pullup to drive the pin low. This isn't a big change [See fr2111_swi2c_master.h] but it would have to be done.

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