NRF24 library - Is it possible to have offset when reading?

Using Arduino Networking, Protocols, and Devices
1

Hi,

I want to implement a remote control and use nrf24 modules as transceiver.
I am currently using nrf24 library GitHub - nRF24/RF24: OSI Layer 2 driver for nRF24L01 on Arduino & Raspberry Pi/Linux Devices.

The first version of my protocol looks like this:
byte 0 - 16 are RC channels with value 0-255.
byte 17 is crc8 calculated over channel 0 to 16.

In past I used HM10 device, where I read byte by byte from serial. When calculated byte 17 matches the calculated crc8 of byte 0 to 16 I know I have a valid package.

But my question is: Is that really needed? Is it really possible when reading always bytes 0 to 16 from buffer that I get "between the packets"?

channel id:             00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
start reading here:                                |>
resulting mapping       08 09 10 11 12 13 14 15 16 00 01 02 03 04 05 06 07

Hope you understand what I mean.
I also see that NRF24 Library seems to have some CRC enabled.
So can I just dump my CRC and always read byte 0 to 16?

Many thanks.

2

Hope you understand what I mean.

No, I don't. The radio gives you a complete packet - 17 bytes (if that's what you are sending). It is up to you to use those 17 bytes in whatever way is appropriate. Calculating a CRC based on the first 16 would be trivial.

3

butch:
I also see that NRF24 Library seems to have some CRC enabled.
So can I just dump my CRC and always read byte 0 to 16?

Shure, you could have you own additional CRC, but the standard 16 bit crc is sufficient.
So I would drop the own CRC and always read the whole packet from the hardware.

4