nPM1300 interrupt line always stays high even after clearing events

[PuffinEgg]

Hi,

I am currently trying to enable the GPIO output interrupt functionality on my nPM1300ek with an STM32. However, I am unable to get it work correctly(I was only able to get it working with nRF52dk with the NPMX API and device tree). I am using GPIO2 as the interrupt output pin, but after enabling any one of the interrupt, the GPIO line immediately gets pull high (observed using a logic analyzer) and there is no way for me to reset it even after clearing the interrupt event in the register. In general, I would like to know if there are any extra registers that I would need to write (in init function or in the GPIO interrupt handler) to get this working correctly.

Here are the pseudo I2C code that I am using to configure the interrupt

pmic_write(0x0602, 0x5) // Set GPIO2 to output interrupt

pmic_write(0x0018, 0x1); // VBUS Interrupt Enable Set

Thanks!

[runsiv]

Update: 

What we do in the zephyr driver before enabling an interrupt is clear the corresponding event first. 

setup:
pmic_write(0x602, 0x5);  // Set GPIO2 to output interrupt
pmic_write(0x017, 0x1);  // Clear the event
pmic_write(0x018, 0x1);  // Enable interrupt on the event

and then in the interrupt 

pmic_write(0x017, 0x1);  // Clear the event
do_stuff();

We would also recommend verifying that the handler is actually executed as it might also be an misconfigured interrupt input on the host side. 

Regards

Runar

[PuffinEgg]

Thank you! That was the issue. I forgot to clear the event prior to enabling the interrupt.

[runsiv]

Glad to hear it worked for you

Don't hesitate to create new cases if there any other question in the future

Regards

Runar