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

[Mohinish]

Hi Nordic,

I am trying to implement a custom uart driver in my inter processor communication application. In the driver implementation I want to use uart with dma and I want to know  the TX_STARTED, END_TX, RX_STARTED, END_RX events. The nrf connect SDK has Zephyr uart driver but this doesn't forward all the above events to application. Are there any other drivers which I can use to achieve the above goal.

Regards,

Mohinish Naik

[JONATHAN LL]

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

[Mohinish]

Hi Jonathan,

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

Regards

Mohinish Naik

[mtsunstrum]

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

[JONATHAN LL]

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