MSPM0G3507: M0 Driverlib disables INENA when changing Pull-Up/Down resistor

Scott Specker

Part Number: MSPM0G3507
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

When changing a digital GPIO pull-up/down resistor using DL_GPIO_setDigitalInternalResistor(), why does the M0 Driverlib clear the INENA (Input Enable Control Selection) bit in the PINCMx register? Is this a mistake or was this done on purpose?

I couldn't figure out why my GPIO pin stopped working after changing the resistor setting. After some experimenting, it was because INENA was disabled when changing the resistor value. And apparently, INENA must be enabled if you want to poll the pin.

Oddly enough, INENA is not cleared when using the DL_GPIO_setAnalogInternalResistor() function. (Although, using the "Analog" version of this function does change the PC (pin connect) setting, which is why I'm guessing we have both functions.)

Thanks Much,
Scott

3 months ago

0 Pengfei Xie 3 months ago

TI__Expert 8485 points

Hi Scott,

Understood. Yes the INENA need to be enabled if the pin is used as any input function of GPIO or peripherals.

Could I ask which SDK version are you using?

0 Scott Specker 3 months ago in reply to Pengfei Xie

Intellectual 310 points

I am using the latest version 2.04.00.06.

Although, since I just updated my project to the new revision, this part of Driverlib seems unchanged from 2.03.00.07.

+1 Pengfei Xie 3 months ago in reply to Scott Specker

TI__Expert 8485 points

Hi Scott,

Got it. I think it is a mistake of the driverlib and I have reported this issue. Thanks for your question.

And by workaround, you could configure the GPIO pull-up/pull-down resistor in sysconfig or you could manually enable the INENA bit by yourself in you application code.

0 Scott Specker 3 months ago in reply to Pengfei Xie

Intellectual 310 points

Thanks. I am using SYSCONFIG to set the initial value of the resistors. Then using the Driverlib to change one of the resistors at runtime. As you indicated, I was able to tweak my code to set INENA... once I figured out this was what was happening.

Thanks for reporting the issue!

Take Care,
Scott

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MSPM0G3507: M0 Driverlib disables INENA when changing Pull-Up/Down resistor