NRF24L01+ working irregulary

[Fred Lamer]

Hi everyone,

I bought two NRF24L01+ off ebay a couple of week ago and started to work on them this week. I seem to have problem with establishing a reliable communication between both devices. I enabled Shockburst by setting register EN_AA all to "1" and register EN_RXADDR all to "1". I should then have auto-acknowledgement on the TX device. Both device work with the IRQ pin with external interrupt on my two MCU (ATMEGA8) and interrupt are masked with the STATUS register to show what interrupt is trigerred by the NRF. I seem to have a bad communication, but the packet still cross from the TX to the RX irregularly. I checked the value of the received packet and it is the same as the one sent., but no acknowledge received in the TX device...

Any fast thoughts on why it would do this?

Thanks, Fred

[Fred Lamer]

Hi, thanks a lot for the reply. unfortunately, I wasn't able to get the two NRF24L01+ working with Shockburst Technology. I just disabled the Auto-Acknowledgement and it is now working fine. Guess I will have to do the Acknowledgement myself, but it is not an issue for the project that I'm working on. With the register EN_AA = 0b00000000, both devices work perfectly and have an 99% if not 100% rate.

Thanks again for the help, Fred

[Håkon Alseth]

Auto-acking should be enabled by default, so you should be able to use ACKing when EN_AA is untouched.

Note that the TX address and PIPE0 address must be equal on your PTX device in order to get ACKing working. Have you set these?