nRF24L01 Dynamic Payload Length Problem.

Wireless & IoT
1

Hi ,

In Revision 2.0 datasheet of nRF24L01 , a new feature called “DYNAMIC PAYLOAD LENGTH” is added.

I tried to use the same at the receiver side so that transmitter can transmit a payload of varying size.I am not using other feature like Payload with ACK and Selective Auto Acknowledgement.

My problem is that i could not receive any payload at the receiver side.

I used the following settings

nrf24l01_lock_unlock(); /* ACTIVATE command followed by data 0x73 /
nrf24l01_enable_dynamic_pl(); / FEATURE = 0x40 → Enable Dynamic payload length */
nrf24l01_setup_dyn_pl(0x02);/*DYNPD = 0x02 ->Enable Dynamic payload length data pipe 1 */

RX_PW_P1=1 /* Enable the pipe of 1 Byte */

I transmitted 8 bytes of payload in pipe 1 which is not received at the receiver.

But Once i changed the settings as shown below , I am able to receive the character

RX_PW_P1=8 /* Enable the pipe of 8 Byte */

nrf24l01_setup_dyn_pl(0x00);/DYNPD = 0x00/

I could not understand the behaviour of Dynamic Payload Length

Any help would be greatly appreicated

2

Hi All,

Below is cited from the datasheet version 2.0(Page 27 of 74)

In order to enable DPL the EN_DPL bit in the FEATURE register must be set. In RX mode the DYNPD register has to be set. A PTX that transmits to a PRX with DPL enabled must have the DPL_P0 bit in DYNPDset.

Based on this finally my problem is solved.

I would like to thank “yorkbluedream” who is the member of this group has helped me in solving the problem.

Final Conclusion is

At TX side ,

ONLY DPL_P0 must be set irrespective of any pipe is uded for tx.