How does BLE + ESB receive?

[eric_cheng]

Hello Nordic Engineer,

I'm a beginner

In this GitHub

If I add code after 473 lines

rx_payload.noack = true

what will the final result be?

Thanks

[Sigurd Hellesvik]

Hi Eric

Which microcontroller are you using?

If I add code after 473 lines

rx_payload.noack = true

Have you tried this yourself?
If so, did it disable the ack in the rx payload as expected?

Regards,
Sigurd Hellesvik

[eric_cheng]

Hi ,

Can you answer this question, please?

Thank you

[Sigurd Hellesvik]

Hi Eric

Try to use

nrf_esb_config.selective_auto_ack = true;
rx_payload.noack = true;

on the "relay" and only

nrf_esb_config.selective_auto_ack = true;

on the two other devices.

Does this fix your issue?

Regards,
Sigurd Hellesvik

[eric_cheng]

Hi,

I tried to turn off ack

But there are still out of synchronization

Any of my products can be used as "relay"

So their program are the same

Under this premise, all products (including "relay")

Both lines of code will be executed

nrf_esb_config.selective_auto_ack = true;
rx_payload.noack = true;

==================

I'm thinking about a problem

"relay" after pairing with mobile phone

"relay" sends an instruction to notify the nearby device to turn off Bluetooth

Do you think this way can solve the synchronization problem?

Thank you

[Kenneth]

Have in mind that when you are not using ACK, it is a chance that one or both devices will not receive the packet. So just to make sure I don't misunderstand the problem here, are some packets received from the relay, or are no packet received from the relay?

Kenneth

[eric_cheng]

Hi,

Thank you for your reply

I want to discuss the content of your reply in two parts

Have in mind that when you are not using ACK, it is a chance that one or both devices will not receive the packet. 

In my understanding, TX can send data to Rx

If RX wants to send data to TX, it must use ACK

RX can choose to turn off ack (do not send response to TX)

TX can also choose to turn off ack (no response is received)

Do I have a wrong understanding? (If I'm wrong, hope you can correct me)

=========================

So just to make sure I don't misunderstand the problem here, 
are some packets received from the relay, 
or are no packet received from the relay?

"Relay" will only receive BLE data and send ESB_ ptx

As for other Devices, they have the functions of TX and RX at the same time

Thank you

[Kenneth]

eric_cheng said:

RX can choose to turn off ack (do not send response to TX)

This is not possible, it's only the TX that can control whether it want an ACK or not.

eric_cheng said:

TX can also choose to turn off ack (no response is received)

Correct.

[eric_cheng]

Thank you,

TX can close or open ack, I understand this

but for RX

《rx_payload.noack = true;》What does this code do?

[Kenneth]

Calling rx_payload.noack in the callback irq handler will have no effect.

If you don't want to receive an ack, then set this flag to true before calling nrf_esb_write_payload().

Best regards,
Kenneth

[eric_cheng]

I don't quite understand the specific effect...

But I turned them all off

nrf_esb_config.selective_auto_ack = true;
rx_payload.noack = true;

=========================

I describe my current approach

Can you correct me if I'm doing something wrong?

I used Timer1 to switch TX and RX In 《timer_event_handler》

state = !state;

if(state == true) 
	{		
		//memcpy(&nrf_esb_config, &tmp_config, sizeof(nrf_esb_config_t));
		nrf_esb_config.payload_length     = 2; 
		nrf_esb_config.protocol           = NRF_ESB_PROTOCOL_ESB_DPL;
		nrf_esb_config.retransmit_delay   = 1000;
		nrf_esb_config.bitrate            = NRF_ESB_BITRATE_2MBPS;
		nrf_esb_config.event_handler      = nrf_esb_event_handler;
		nrf_esb_config.mode               = NRF_ESB_MODE_PTX;
		nrf_esb_config.tx_output_power		= NRF_ESB_TX_POWER_4DBM;
		nrf_esb_config.selective_auto_ack = true;
		nrf_esb_config.radio_irq_priority = 0; 
	}
	else
	{
		//memcpy(&nrf_esb_config, &tmp_config, sizeof(nrf_esb_config_t)); 
		nrf_esb_config.payload_length     = 8;
		nrf_esb_config.protocol           = NRF_ESB_PROTOCOL_ESB_DPL;
		nrf_esb_config.bitrate            = NRF_ESB_BITRATE_2MBPS;
		nrf_esb_config.mode               = NRF_ESB_MODE_PRX;
		nrf_esb_config.event_handler      = nrf_esb_event_handler;
		nrf_esb_config.selective_auto_ack = true;
		nrf_esb_config.radio_irq_priority = 0;
	}

I don't know if it is correct to use timer to change TX and RX?

Thank you

[Kenneth]

Hi,

I suggest to get an PPK II, then you can see in real-time based on the current consumption when it's in rx, tx, idle, and switching. This will make it much easier to see how your changes affect timing etc.

Best regards,
Kenneth