UART RX double buffering

[guohui]

Hi Nordic experts,

I'm working for Particle Inc. We are using nRF52840 on our dev boards (Argon / Boron / etc.). We are experiencing a UART RX data lost issue using a single buffer for receiving. We designed our own UART driver that is independent from the nrfx driver. See the soure code for your reference: https://github.com/particle-iot/device-os/blob/develop/hal/src/nRF52840/usart_hal.cpp. Here I'd like your official suggestion about the UART RX path: whether double buffering is the best approach to avoid RX data lost. We have created a PR to refactored our driver to use double buffering for RX path: https://github.com/particle-iot/device-os/pull/2685. 

Any suggestion would be really appreciated.

Best regards,

Guohui

[Simonr]

Hi

Okay, so even double buffering won't guarantee that you won't lose data when using the UART peripheral, to be certain you're not missing anything you'd need to enable flow control, which is an application choice. 

Best regards,

Simon