nrf52 inv-ESB receive 0 length packets

RE: nrf52 inv-ESB receive 0 length packets

Håkon Alseth — Fri, 24 Sep 2021 10:13:41 GMT

Hi,

You should not change the payload content after triggering TASKS_START. You should wait until the EVENTS_END is set to ensure that the content has been sent on-air.

Kind regards,

Håkon

RE: nrf52 inv-ESB receive 0 length packets

Liny — Thu, 23 Sep 2021 09:42:38 GMT

hi Hanon Alseth，

i have two questions:

1、can i modify the packet's length after tx—ready came but before event_address came?

2、can i modify the packet's payload after tx—ready came but before event_address came?

added：in 52832

thanks！

RE: nrf52 inv-ESB receive 0 length packets

Håkon Alseth — Thu, 23 Sep 2021 08:37:43 GMT

Hi,

You are changing the library, so I cannot state explicitly why its happening, but its usually two reasons:

1. Changing the content of the buffer after the radio has sent the data

2. Changing the PTR after the radio has latched.

You should not update the pointer after the radio has been started:

https://infocenter.nordicsemi.com/topic/ps_nrf52840/radio.html?cp=4_0_0_5_19_12#concept_dxt_xfj_4r

Once the START task is triggered, the EASYDMA latches, but note that the PTR register itself is double-buffered.

Kind regards,

Håkon

RE: nrf52 inv-ESB receive 0 length packets

Liny — Thu, 23 Sep 2021 05:47:31 GMT

hi Hanon Alseth，

i have found the problem .

the reason is when i send packets in periphral, i add some code in on_radio_disabled_rx(), it takes more than 40 us （in radio fast mode，disable - tx raedy takes 40.25us ），it cause RADIO->PTR updated after tx-ready came。so ，although m_tx_payload_buffer[0] = 21, but NRF_PTR may not point m_tx_payload_buffer?(want your explain)。

i have a questions：

Q：does RADIO->PTR register locked after tx—ready came？if not ，why？

RE: nrf52 inv-ESB receive 0 length packets

Håkon Alseth — Wed, 22 Sep 2021 11:11:41 GMT

Hi,

[quote user="Liny"]i use PTX as cental,use PRX as peripheral.centeral is a receiver,one centeral corresponds to two peripheral.[/quote]

Is the PRX devices setup with different RF channels?

If not, both of them will ACK at the same time and that will create issues.

[quote user="Liny"]

A3:i use pipe 0 for pairing,after finish pairing , i use pipe 1 for data pipe.i will update the prefix1 of central when switch peripherals.

the problem mabye related to the clock in debug mode? i have no idea.

[/quote]

What is the actual RF address set? 0xE7E7E7E7 ?

Kind regards,

Håkon

RE: nrf52 inv-ESB receive 0 length packets

Liny — Wed, 22 Sep 2021 10:05:39 GMT

thanks for your replay

A1:i use PTX as cental,use PRX as peripheral.centeral is a receiver,one centeral corresponds to two peripheral.

A2: i switch uart or rtt by set NRF_LOG_BACKEND_RTT_ENABLED or NRF_LOG_BACKEND_UART_ENABLED to 1 .while in rtt mode ,i had set NRF_LOG_DEFERRED to '1',and add "NRF_LOG_PROCESS()" to main loop.i think it's not the key issue。

A3:i use pipe 0 for pairing,after finish pairing , i use pipe 1 for data pipe.i will update the prefix1 of central when switch peripherals.

the problem mabye related to the clock in debug mode? i have no idea.

note that :if i connect peripheral with jlink,and click "connect" in RTT-viewer,it won't happen,central can receive 21 length bytes. if don't connect jlink ,it would happened.

RE: nrf52 inv-ESB receive 0 length packets

Håkon Alseth — Wed, 22 Sep 2021 09:45:35 GMT

Hi,

Q1: Which device is setup as a PRX and which is setup as a PTX device?

Is the central the receiver?

Q2: Are you switching between printing over UART and RTT?

Note that you should use NRF_LOG_DEFERRED set to '1' to avoid printing in interrupt handlers. This requires you to have a added call to "NRF_LOG_PROCESS()" in your main loop.

Q3: What is your configured RF address?

Kind regards,

Håkon

RE: nrf52 inv-ESB receive 0 length packets

Liny — Wed, 22 Sep 2021 08:47:46 GMT

add something：

it is in on_radio_disabled_tx_wait_for_ack（）

if (NRF_RADIO->EVENTS_END && NRF_RADIO->CRCSTATUS != 0)

{

NRF_LOG_INFO("length = %d",m_rx_payload_buffer[0]);

·····

}

and it printf "length = 0"

RE: nrf52 inv-ESB receive 0 length packets

Liny — Wed, 22 Sep 2021 08:10:38 GMT

i am sorry about that i write some wrong message,it should be

it is in RADIO_IRQHandler():

if (NRF_RADIO->EVENTS_END && (NRF_RADIO->INTENSET & RADIO_INTENSET_END_Msk))

{

NRF_LOG_INFO("m_tx_payload_buffer[0] = %d",m_tx_payload_buffer[0]);

}

and it printf "m_tx_payload_buffer[0] = 21".(this place i use uart to printf log)