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Can I get some clarification regarding pipes and addresses?

JimR

Hi,

I've asked a few questions previously regarding programming of the nRF24L01/+ for simple data interchange between two devices, and my questions were answered -- many thanks.

However I still don't seem to be able to get a PTX and a PRX device to 'talk' to each other, and I think it may be because I'm not doing the right thing regarding setting up the pipes and addresses. I've read through the relevant pages in the nRF24L01+ data sheet, but I must be 'thick' because I can't get things straight. I've also looked through the code in the RF24 library (for Arduinos), but to be honest I can't see how the functions work in that library -- or how the 'Getting Started.ino' example works, especially for PTX mode.

At present I'm setting 'Radio 0' to receive using pipe 0, and leaving its TX_ADDR at &H30E7E7E7E7E7, while 'Radio 1' is set to receive on pipe 1 with its address set to &H30C2C2C2C2C2 -- is that wrong? Then when either radio is set to PTX mode or PRX mode, I simply clear or set the PRX bit in the chip's CONFIG register -- with the CE line pulsed high for 20us in PTX mode, after loading the transmit data into the fifo.

There must be something wrong with the above, but I can't see what it is. I guess I'm also confused about the ACK packet which seems to be sent by the PRX device -- this is sent ahead of the returned payload, is it not?

I hope you can make sense of the above, and provide some clarification please.

Thanks, Jim

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    Thank you Hung Bui, for that helpful reply. I have tried following the code used in both the Arduino program and in the RF24 code library in which its functions are sourced, but this has proved to be very difficult. In the meantime, can you please answer another question. I understand that whenever you send commands or data to the nRF24L01 via the SPI interface, it returns the contents of the status register. But presumably what it returns is the contents of the status register BEFORE the command or data is received -- right? If this is so, it sounds like if you want to know the chip's status AFTER the command or data is received, you need to read from the status register again, straight afterwards. Can you please confirm that this is correct -- or explain why it isn't. Thanks, JimR

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    Thank you Hung Bui, for that helpful reply. I have tried following the code used in both the Arduino program and in the RF24 code library in which its functions are sourced, but this has proved to be very difficult. In the meantime, can you please answer another question. I understand that whenever you send commands or data to the nRF24L01 via the SPI interface, it returns the contents of the status register. But presumably what it returns is the contents of the status register BEFORE the command or data is received -- right? If this is so, it sounds like if you want to know the chip's status AFTER the command or data is received, you need to read from the status register again, straight afterwards. Can you please confirm that this is correct -- or explain why it isn't. Thanks, JimR

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