nrFL2401,FIFO_STATUS=0xFF just after init or RXconfiguration

[diegotrex]

Hello,
i'm developing some boards with nRF24L01, everything was going fine,
i was able to write and read payloads back and forth using modules mounted on 4 different hardwares!
The code is the same except for low level SPI and GPIO functions,of course.
Now i'm on the definitive PCBs,both using nRF24L01+ modules.
One is with a NXP Kinetis uC (board A)and the other is managed by a small STM32L0 uC(board B).
I used nRF24L01 with both families before and as i said,averything was working fine.
Now i'm able  to have B TX and A RX,receiving,with IRQ low pulse and payload ok,
but i'm no longer able to receive on B RX from A TX,
I put both in RX configuration and immediately then i did the dump af all registers to compare the 2 cases.
They looks all the same each other except
FIFO_STATUS=0x00 on the working board A 
FIFO_STATUS=0xFF on the not working board B
It doens not look as an HW fault because it is the same on another B-board.
The CSN and CE signals looks acting correct on both boards.
What else could i check?
Please can i have your help?
Thanks,
Diego

[Håkon Alseth]

Hi,

 

If everything has been working correctly before, but stopped after getting a new module, it might be that you have gotten a module which is not genuine. There are unfortunately nRF24L01+ clones out there, and if you haven't purchased through any of our distribution partners, we cannot guarantee that the nRF24L01+ module is genuine.

Could you share the trace code of both nRF24L01+ devices on board A and board B?

It should be something like:

NRF M

24L01+

2020AB

 

Kind regards,

Håkon

[diegotrex]

Thanks Hakon,sorry for having missed your answer
Tomorrow I'll be again on the boards and I will send you infos
Anyway is the same module behaving different,probably I will discover that my code is not exactly the same
By now thanks for your hints

Diego