nrf24l01+: ack payload length > 1 on PRX TX'ed => Same data as first byte RX'ed on PTX.

[ApaX]

I have two NRF24L01+ modules - I am not sure if they are fake?

One node acts as PTX and another as PRX.

On both devices i have the features auto_ack and ack_payload enabled.

I can send data between PTX and PRX with no problem.

If i use the PRX ack payload with 1 byte i have no problem in receiving this on PTX. I change the value of the payload with CMD_W_ACK_PAYLOAD command.

if i have a ack payload length > 1 byte, lets say 10 bytes - and change the data with CMD_W_ACK_PAYLOAD on the PRX i get 10 bytes back on PTX.. but all bytes are identical to first byte...

Does this make sense?

Can i read the content of the ack payload on the PRX to verify my data?

[Hung Bui]

Hi ApaX,

Have you made sure you enable dynamic payload length on both sides ? You need to set EN_DPL besides EN_ACK_PAY. You also need to set the DPL_Px matches with which pipe you used.

Have you made sure you received 10 bytes when you have RX_DR interrupt (with R_RX_PL_WID ) ?

EDIT:

Example:

ptx - ACKPayload.rar

prx - ACKPayload.rar