NRF9160 Disable UART and RX pin into an interrupt pin

[Lamdev]

Hello everyone,

I'm working on a project with NRF9160 nRF Connect SDK v2.3.0.

In my project i use UART0 to exchange data and i disable the UART when is not use.

I need an interrupt to wake up my device when data come on the UART pin (TX/RX).

I have found different topic to disable and enable UART on runinng time. 

Now, when my uart is disable, i would like to convert RX pin into an interrupt pin which allow me to re-enable the UART to get data when interrupt occur.

Could you tell me if you have any advice about that ?

Best regards,

Lam

[Kazi Afroza Sultana]

Hello,

Which device are you connecting the nRF9160 to over UART? if it's another nordic device, you can use our low-power UART driver.

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/peripheral/lpuart/README.html

''The low power UART driver implements the standard asynchronous UART API that can be enabled with the CONFIG_UART_ASYNC_API configuration option. Alternatively, you can also enable the interrupt-driven UART API using the CONFIG_NRF_SW_LPUART_INT_DRIVEN configuration option.

The protocol used by this driver implements two control lines, instead of standard hardware flow control lines, to allow for disabling the UART receiver during the idle period. This results in low power consumption, as you can shut down the high-frequency clock when UART is in idle state.''

Thanks.

BR

Kazi

[Lamdev]

Hello,

Thanks for your return,

It's connected to a specific board that i have develop. 

My objectif is to reduce power consumption to 50uA.

So i'm thinking to stop UART completely and waiting an interrupt on my RX line that i will have convert into interrupt GPIO. And when interrupt coming, i reactivate my uart to receive data.

This way is possible ?

Best regards,

Lam