RE: nrf24l01 to nrf52832 esb with dpl noack flag is the wrong way around

ovrebekk — Tue, 01 Dec 2020 15:28:38 GMT

That is excellent news. Thanks for the update, and the best of luck with your project 🙂

RE: nrf24l01 to nrf52832 esb with dpl noack flag is the wrong way around

EduanShuda — Tue, 01 Dec 2020 09:38:51 GMT

Thanks,

I bought original chipsets from Digikey and this solved the problem. Everything now working as expected

RE: nrf24l01 to nrf52832 esb with dpl noack flag is the wrong way around

ovrebekk — Thu, 02 Jul 2020 11:57:13 GMT

The nRF24L01 and nRF24L01+ has a small implementation bug where the NOACK bit is inverted when you enable dynamic ACK. In other words it acts as an ACK-bit rather than a NOACK bit. When the bit is set the PRX will return an ACK, and if the bit is cleared no ACK will be sent.

When dynamic ACK is disabled this bit will always be 0, as expected.

The nrf_esb library for the nRF52 series is designed with this bug in mind and will behave in the same way, in order to retain compatibility with the older nRF24L devices, but it is important that you enable the selective_auto_ack field when you configure the library:

nrf_esb_config.selective_auto_ack = true;

There are many counterfeit nRF24L01 clones out there, and we have seen examples of counterfeit devices that implement the NOACK bit as it was originally intended (and documented), rather than how it actually works in the genuine devices.

To see if this is the case for you you can get a genuine nRF24L01+ module from a reliable vendor and compare it to the modules you already got:
https://www.sparkfun.com/products/691

Best regards
Torbjørn