Nrf5340-Dk: UART DMA Packetization

RE: Nrf5340-Dk: UART DMA Packetization

ovrebekk — Mon, 08 Nov 2021 12:30:23 GMT

Hi Matt

There is an implementation of Slip in Zephyr, which is essentially a protocol for handling UART packetization, but the Zephyr implementation doesn't seem very generic:
https://github.com/zephyrproject-rtos/zephyr/blob/main/drivers/net/slip.c

Possibly you could use this library as a starting point, and modify it to fit your requirements better, by replacing the net_pkt struct with a struct of your own.

Essentially Slip uses the standard method of using a dedicated 8-bit value to signal the end of a packet, and using a different 8-bit value as an escape character, which you can use whenever one of these dedicated values show up in the data that you want to send.

Best regards
Torbjørn

RE: Nrf5340-Dk: UART DMA Packetization

mattmacleod — Fri, 05 Nov 2021 23:19:52 GMT

Hi Torbjørn,

Thanks for your response.

I was looking for the best way to packetize sensory data from my nrf5340 so that it could be passed over UART to my PC.

I came up with a work around using uart_tx thought deliberately writing out the struct elements into the byte array but I was wondering if there was an api that could packetize a struct similar to that one over UART.

Thanks,

Matt

RE: Nrf5340-Dk: UART DMA Packetization

ovrebekk — Thu, 04 Nov 2021 12:50:40 GMT

Hi Matt

I am a bit unsure what it is you need help with.

Are you asking how to convert your packet struct to a byte array so you can pass it to the UART API's?

Or are you looking for a way to packetize the UART stream?

Best regards
Torbjørn