a question about the communication between nRF24LE1 and nrf51802

[wuyanwei]

hi,

  I have a question about the communication between nRF24LE1 and nrf51802.They communicate using the Gazell protocol,Can you help me solve this problem？

1.The communication rate is 250K,NRF24LE1 sends a packet of data every 50ms, and nrf51802 has no problem receiving ,but when the time is 150ms - 700ms ,the success rate of nrf51802 is only 50%.Then when the time is 700ms - 1000ms,nrf51802 has no problem receiving .

2.NRF24LE1 sends a packet of data every 300ms, and nrf51802 replies to one packet every 50ms, a total of four packets.In this case, there is no problem with sending and receiving, and there is basically no packet loss.The communication rate is 250K.

3.The communication rate is 2M.When the transmission packet interval of nRF24LE1 is less than 150ms, the reception success rate of nrf51802 is less than 30%. When the packet interval is greater than 150ms, the reception success rate of nrf51802 is greater than 80%.

4.There is no problem with the communication between nrf51802 and nrf51802.

[wuyanwei]

hi,

  I have a question about baud rate switching when nrf51802 uses Gazell protocol. Would you like to ask me.

The slave works in the host receiving mode, switches the baud rate every 10ms, switches between 250K and 2m, and executes in the main loop. After communicating with a certain rate, the slave will be fixed at the current rate and will not switch. There is a probability that the master cannot communicate with the slave with 250K, but the 2m communication can be connected. If the host uses 2m for direct communication during slave switching, there is no problem. The switching setting is made in the disabled callback. I don't know whether it conflicts with the disabled callback at the moment of receiving data.

[Kenneth]

Maybe you can try to power cycle the radio, this should at least reset all RADIO register values and states:

*(volatile uint32_t *)0x40001FFC = 0;
*(volatile uint32_t *)0x40001FFC;
*(volatile uint32_t *)0x40001FFC = 1;

[wuyanwei]

Thank you ,

I don't think the opportunity will fix a wrong baud rate when stopping the switching at the moment of receiving the data. How can I judge whether I have received the data again when switching the baud rate? Or how can I know what baud rate is currently used when I receive data? Do you have a 51802 data book? Can you give it to me?

[Kenneth]

You need to combine the nRF51802 PS with the nRF51 Reference Manual:

https://infocenter.nordicsemi.com/topic/struct_nrf51/struct/nrf51802.html 

https://infocenter.nordicsemi.com/topic/struct_nrf51/struct/nrf51_refmanual.html 

[wuyanwei]

Thank you ,

I want to know that if data is received during the process from disable () to the disabled () callback, it will enter NRF_ gzll_ host_ rx_ data_ Ready? Is it executed in the middle, or is NRF executed after the disabled () callback is completed and then enabled_ gzll_ host_ rx_ data_ Ready? What is the priority order?

[Kenneth]

Honestly don't remember, I would not rely on any data to be received between disable() and disabled().

Kenneth