nrf24L01 multiple pipes

Wireless & IoT
1

Hi there! I have been using the nrf24L01 for a while without problems. But now I need to use multiple pipes, not just one as I have been doing so far.

The problem I’m facing is that I can’t receive any data unless it goes to pipe_0. If I use the same code on the transmitter but just change the TX address to be one from pipe_1 to pipe_5, the transmission will stop.

I am using AA and ESB.

Registers ENAA_Px is 1

Registers ERX_Px is 1

The LSB of the RX_ADDR_Px registers is not the same.

PTX RX_ADDR_P0 is equal to PTX TX_ADDR, wich is equal to the PRX RX_ADDP_Px.

I have followed all the specifications on the datasheet, but the pipes_1-5 are just not receiving data.

Has any one used multiple pipes or has some advice to give?, Thanks

2

Have you set the RX_PW_Px field for the pipe you’re trying to receive on to something other than 0 (specifically on the pipes other than 0)? If not, you won’t be able to receive data on that pipe.

3

Yes, I have set up the length of the pipes on the PRX, which is the same length of the packets sent by the Transmitter.

In the transmitter I have Enable Auto.Ack for pipe_0 and pipe_0 enabled in order to receive the Ack. from the receiver. Should I set the RX_PW_P0 to any value on the transmitter? But any way, when I send a packet to the pipe_0 of the receiver, the data is received without problems.

There is some other relevant action to take care of in order to receive data in other pipes than 0?

4

articCircle:
Should I set the RX_PW_P0 to any value on the transmitter?

This shouldn't make any difference on the transmitter. For the transmitter, you have to get the data rate, address, address width, # of CRC bytes, and payload width right for the chips talk.

My suggestion to you is to start off leaving everything in a default configuration (except PWR_UP bit on TX/RX and PRIM_RX bit on RX). This allows you to receive data on pipes 0 and 1. Test this to see if you can get it working. Remember to change the TX address in your transmitting unit to exactly the default address of pipe 1 of your receiving unit when you try to talk to it (0xC2C2C2C2C2).

You can also look at my code to see if I do anything differently than you do. A quick search on the forum for nrf24l01.h and nrf24l01.c should turn up a link to my files.