topic Programming PN7642 with MCUXpresso in NFC

Programming PN7642 with MCUXpresso

MPEngineering — Thu, 17 Jul 2025 11:09:07 GMT

Hey there,

i got two problems using the #PN7642 (Dev Kit) with MCUXpresso (v24.12.148, SDK version 2.12.5)

First one is, that i´m not able to use kGPIO_I2CM_SDA and kGPIO_I2CM_SCL Pins as Output pins. Trying to set them high results in 0,5 V level.

I tried SPIM pins as Output and this was no problem.

Second one is, that i cannot see the Register values using Peripheral+ view. When I stop the Controller in debug mode, all Registers are red. Only Timer Component shows me some values. What could cause this?

Best regards

Oliver

Re: Programming PN7642 with MCUXpresso

KaiLi — Thu, 17 Jul 2025 13:31:34 GMT

Hello @MPEngineering

You should configure the register PCRM_PADOUT (0xBB) to set SDA/SCL as general GPIO, and then these two pins can be configured to have a high or low output.

Re: Programming PN7642 with MCUXpresso

MPEngineering — Thu, 17 Jul 2025 14:33:37 GMT

Hey KaiLi,

got it.
And what about the Register View? See the photo attached.

Best regards

Re: Programming PN7642 with MCUXpresso

KaiLi — Fri, 18 Jul 2025 11:39:04 GMT

Hello @MPEngineering

It should be as the below:

Re: Programming PN7642 with MCUXpresso

MPEngineering — Fri, 18 Jul 2025 13:05:58 GMT

Well, i want to know the recent register values which i wrote to the controller.

In my understanding I use Peripherals+ view to show the recent values.
So stopping the Controller in debug mode should show me these values, but i only see the red highlighted Registers without values.

What could be the problem?

Best regards

Re: Programming PN7642 with MCUXpresso

KaiLi — Mon, 21 Jul 2025 02:36:01 GMT

Hello @MPEngineering

This should be related to the IDE. You can use an intermediate variable (reg_value) for debugging. That is, you can read the value of the peripheral register and assign it to reg_value, then add reg_value to the debugging window. At this time, you can see the value of the register. It is recommended that you try this.