https://devzone.nordicsemi.com/f/nordic-q-a/89796/nrf52-receive-uart-data-via-interruptWith our nRF52832/52840 products, the UART sometimes drops characters. I&#39;m using nrf_drv_uart (SDK12) with two, one-byte buffers, and an interrupt called when data is received. However the 1 byte buffers are just not enough even at 9600 baud when writingen-USTelligent Community 13Mon, 11 Jul 2022 11:11:33 GMThttps://devzone.nordicsemi.com/thread/376394?ContentTypeID=1Mon, 11 Jul 2022 11:11:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a969acd8-fc5b-406b-9a8f-01758968eb11Gordon<p>Thanks! Unfortunately I can&#39;t use hardware flow control, but thanks for the libuarte link - I can at least look into that as an example of how to do what I need on SDK12.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/376178?ContentTypeID=1Fri, 08 Jul 2022 11:14:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:490ee943-0ddc-47bb-9bd6-42c11617b722Einar Thorsrud<p>Hi,</p> [quote user=""]But if you raise the buffer length, you then don&#39;t get an interrupt when a character arrives (it seems the buffer has to be full before you get an IRQ).[/quote] <p>Yes, that is correct. This is a limitation with the UARTE peripheral. To get interrupt per character you need to use the older UART (not UARTE) peripheral, but that has the limitation you have seen.</p> <p><a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/lib_libuarte.html">Libuarte</a> is a library that uses GPIOTE and PPI to overcome the limitations of the UART and UARTE peripherals, but that is only present in later SDKs and is quite complex.</p> <p>Another option could be to use flow control (unless the HW is already set in stone).</p><div style="clear:both;"></div>