Some issues of GPIO interrupt

[liluo18]

Hi, I have some questions about GPIO interrupt.

Now, I want to know the state of the pin, So I use the gpio_pin_read(PIN) to get the state. But when the pin is suspended, the value returned from gpio_pin_read(PIN) is uncentain. Actually, it must be low when pin is suspended. What can I do to get the right state?

Someone told me to config pull_cfg as pulldown. I tried it but not work. After configed as pulldown, gpio_pin_read(PIN) only got low.

And another question. Use GPIO interrupt, configed as LOTOHI.  Sometimes the pin changed from low to hign, there wasn't interrupt handling. I used the oscilloscope to check the pin state, it viewed low to high. This situation is accidental.

[FormerMember]

How did you configure the gipo?

How did you configure GPIOTE? And how do you handle the GPIOTE events (do you remember to clear the events)?

[liluo18]

1. When the pin is suspended, use gpio_cfg_input(PIN, NRF_GPIO_PIN_NOPULL), and then gpio_pin_read(PIN). The value read is uncentain.

2.Question 2 has been solved, it was a hardware problem.

[FormerMember]

When there a pin has no pull, it is normal that the value is in certain. To control the value of the pin, pull-up or pull-down has to be used.