How to enable RTS/CTS flow control on UART

[Richard11115]

I'm trying to send serial data from my computer (using python and pySerial) to the nrf52840. It works generally, however I am losing packets – my python reports that it wrote the correct amount of types (3) however my nrf52840 program only reports receiving 2 bytes.

After reading about UART it seems like I could enable hardware flow control (specifically RTS/CTS flow control) to potentially improve reliability. I was wondering how I can enable hardware flow control on the nRF52840?

[Kenneth]

Hello,

This can be done in the devicetree or overlay file by adding the hw-flow-control property, ref:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/build/dts/api/bindings/serial/nordic%2Cnrf-uart.html#dtbinding-nordic-nrf-uart 

Example of nrf52840dk_nrf52840.overlay:

&uart0 {
	status = "okay";
	hw-flow-control;
};

You may also check out this one:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/peripheral/lpuart/README.html 

Kenneth