nPM2100 interrupt not triggering with general timer

RE: nPM2100 interrupt not triggering with general timer

charlesmarseille — Tue, 14 Oct 2025 15:35:10 GMT

Hi, that was it. I don't know why I defined this value instead of the enum.

Thanks a lot!

RE: nPM2100 interrupt not triggering with general timer

SergeiOv — Tue, 14 Oct 2025 14:00:24 GMT

Oh, I just noticed that in your original snippet you define NPM2100_EVENT_SYS_TIMER_EXPIRY yourself to be equal 2 instead of using the enum provided in the API (mfd_npm2100.h), is there a particular reason for that?

RE: nPM2100 interrupt not triggering with general timer

charlesmarseille — Tue, 14 Oct 2025 13:43:11 GMT

here's the implementation, which is exactly as in the repo's nrf version.

Do you have any idea why I would not see the pulse probing the interrupt pin? The setup seems to be target agnostic, I don't understand why it would work on nrf and not on the stm since it's basic i2c commands.

// from my api

int nPM2100_StartTimer(struct i2c_dev *dev) {
	return mfd_npm2100_start_timer(dev);
}

// from mfd_npm2100.c

int mfd_npm2100_start_timer(struct i2c_dev *dev)
{
	return i2c_reg_write_byte(dev, TIMER_TASKS_START, 1U);
}

RE: nPM2100 interrupt not triggering with general timer

SergeiOv — Tue, 14 Oct 2025 12:14:11 GMT

Hi Charles,

I don't see any issues in the setup function in your code. That seems to closely follow the example. I have also just checked your configuration (pull-up, active low interrupt) with Nordic development boards, and I do get low interrupt pulses on GPIO1 line.

However, the definition of the `nPM2100_StartTimer` function doesn't seem to be included in your snippet. I would suspect something goes wrong there? Please check that function's implementation and share its source if you require further assistance.

- Sergei