Low power UART

[chapman]

I would like to use Uart with low standby power consumption. and I have read this post which recommend to use libuarte:

https://devzone.nordicsemi.com/f/nordic-q-a/53880/low-power-uart-library/217761#217761

I try the  libuarte example , the standby current is ~ 0.9uA. 
In order to low the power consumption, is it necessary to enable hwfc  with cts and rts pin?

Is there any example that can lower the standby current consumption to few uA? Or is there any guideline to change the example code?

Thank you.

[Kenneth]

How you do this depends a bit how you want to do it:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_libuarte.html

You can use nrf_libuarte_drv directly, in which case when you init nrf_libuarte_drv_init() you can specify which events (e.g. from a GPIO falling or rising edge) to start and stop RX by configure startrx_evt and stoprx_evt as described here:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/structnrf__libuarte__drv__config__t.html

Alternatively if you use nrf_libuarte_async (which is built on top of nrf_libuarte_drv()), then you have less flexibility. Then you need to init and uninit nrf_libuarte_async to start and stop rx, this can for instance be done from a GPIO interrupt.

Best regards,
Kenneth