NRF52840 ESB 125KBPS not working

[ZakFS]

Hello,

I'm using the nRF52840 Development Kit and SDK16.0.0_98a08e2.

I'm trying to run the example "proprietary_rf\esb_ptx\pca10056\".

It compiles and runs if I do not change anything but when I try to set the bitrate to 125KBPS I get an error on the RTT.

00> <error> app: ERROR 7 [NRF_ERROR_INVALID_PARAM] at C:\nRF5_SDK_16.0.0_98a08e2\examples\proprietary_rf\esb_ptx\main.c:150
00>
00> PC at: 0x00002D55
00>
00> <error> app: End of error report
00>

Is there any way to resolve this problem?

Best regards,
Zakaria YAHI

[Hung Bui]

I afraid that this mode is not supported by our ESB library. Please have a look here: devzone.nordicsemi.com/.../nrf52840-enhanced-shockburst-nrf24-250kbit-s

[ZakFS]

Thanks for your time.

It seems that in the link you provided, they want to use 250kbps whereas I want to use 125kbps that should be supported by the nRF52840.
There is this project : https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/nrf52840-long-range-demo
It uses 125kbps and No Softdevice (so it should be 125kbps) but alas I cannot find the code used in this project.

I digged in the code of the library and as you said the library does not implement this in the SDK 16.0.0 but maybe with some modifications it can be possible to use ESB with 125kbps.

[Hung Bui]

I'm sorry was mistakenly read 250kbps. But that applied for 125kbps as well. We haven't tested or intended to make the ESB to support 125kbps. 

Note that even the ESB doesn't support that, it's fine to use the Radio directly on that mode. But if you want all the feature of ESB you would need to port the library on your own.