NRF24L01+, ACK packet questions...

[tomjennings]

hi, me again, i posted the long and annoying question on PTX to PTX behavior, in a peer-to-peer application.

i have a specific question regarding the format of an ACK packet, which does not appear in the datasheet:

precisely what is the format of an ACK packet, with and without payload? the datasheet is silent here.

• is the ACK packet CRC'd?
• if auto-ack disabled, does it consist of preamble and address, only?
• if, i PTX mode, having transmitted the packet and awaiting ACK packet, will a packet from another NRF24L01+ received be confused with the awaited ACK packet, if it contains the correct address field?

thanks for any insight here and thanks for hosting this forum!

tom

[Asbjørn]

The ACK is a normal packet. So preamble, address, packet identificatino field, (ACK payload if defined) and CRC.

• Yes, there is CRC on the ACK.
• You can have CRC with no ack as well.
• Potentially, yes, it could be interpreted as an ACK. ACK will always be received on pipe0.