case about nRF9160 UART off on application

[peter.min]

Hi,

Why I use the function  m_device_state_set(cons, PM_DEVICE_STATE_SUSPENDED);  to close the serial port is still a large current:38.80uA?

The verification method is as follows:

sdk :ncs v1.8.0

dk:PCA10090 0.9.0

example path:D:\ncs\v1.8.0\peter\0_uart_off_button

0_uart_off_button.zip

test: current on init:38.80uA

test current on Press button 1:526.9uA

Thank you for all your assistance.
Kind regards,
Peter.Min

[Stian Røed Hafskjold]

Hi, I tried running your code here, and I got the same results as you did. The problem is this line:

ret = gpio_pin_interrupt_configure_dt(&button, GPIO_INT_EDGE_TO_ACTIVE)

GPIO_INT_EDGE_TO_ACTIVE will enable the GPIOTE IN event by default, which will lead to about 20-40 uA of additional current.

The solution is to use the GPIO SENSE mechanism instead. You can do this by adding the following to the prj.conf file:

CONFIG_GPIO_NRF_INT_EDGE_USING_SENSE=y

Now the current should drop to normal idle current.

Best regards,
Stian

[peter.min]

Hi Stian Røed Hafskjold,

Tests are available.
Thank you very much.
Kind regards,
Peter.Min