How to get low level uart event in nrf connect ask?

RE: How to get low level uart event in nrf connect ask?

JONATHAN LL — Fri, 08 Apr 2022 09:03:57 GMT

Hi,

As Martin points out, the Zephyr UART driver uses nrfx with DMA "under the hood", https://github.com/nrfconnect/sdk-zephyr/blob/main/drivers/serial/uart_nrfx_uarte.c

Zephyr UART driver API doc: https://docs.zephyrproject.org/latest/reference/peripherals/uart.html

If you need to use the nrfx UART directly then we do not have lots of examples on that. i blive this is the only thing as of now: https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/boards/nrf/nrfx_prs

Regards,
Joanthan

RE: How to get low level uart event in nrf connect ask?

mtsunstrum — Thu, 07 Apr 2022 00:34:08 GMT

What are your concerns in using the Zephyr UART drivers ?

Under the hood, the Zephyr UART driver will use DMA, and they will use Nordic's nrfx drivers, which will in turn uses nrfx uart TX_STARTED, END_TX, RX_STARTED, END_RX events on your behalf. In addition, they will give your appropriate callbacks when transmission is finished, and upon reception of data.

I wouldn't see any value in starting from scratch to create effectively a new UART driver.

To see Zephyr UART drivers in use, you can check out the NCS projects \nrf\samples\bluetooth\peripheral_uart and/or \nrf\samples\bluetooth\central_uart

RE: How to get low level uart event in nrf connect ask?

Mohinish — Tue, 05 Apr 2022 18:48:40 GMT

Hi Jonathan,

Can you share with me a sample example project to understand how to use the drivers.

Regards

Mohinish Naik

RE: How to get low level uart event in nrf connect ask?

JONATHAN LL — Tue, 05 Apr 2022 12:26:08 GMT

Hi,

NRFX is an alternative that you can use: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.9.1/nrfx/drivers/uart/index.html

Regards,
Jonathan