How to collaborate a private protocol with BLE.

RE: How to collaborate a private protocol with BLE.

Håkon Alseth — Tue, 01 Aug 2023 10:46:53 GMT

Hi,

My apologies for the late reply.

ESB does not support long-range bit modes.

These are the supported bit rates:

https://github.com/nrfconnect/sdk-nrf/blob/main/subsys/esb/esb.c#L595-L629

NRF 250 kBit is supported (although this is a deprecated radio bit rate and not recommended to be used as per the PS), but you will need to adjust your re-transmission delay to a higher value.

Kind regards,

Håkon

RE: How to collaborate a private protocol with BLE.

jhc — Fri, 21 Jul 2023 08:02:08 GMT

Hello Håkon

I am using nrf52840.

The two boards communicate well with each other with 1Mbps or 2Mbps bitrate, but if I set the bitrate to 250kpbs or 500kbps, they can't communicate.

I wonder if it is possible to set the bitrate to 125kpbs or 250kpbs for ESB?

RE: How to collaborate a private protocol with BLE.

jhc — Fri, 14 Jul 2023 08:26:46 GMT

Hi, Håkon

When I request a next (or end) timeslot in case of receiving MPSL_TIMESLOT_SIGNAL_CANCELLED in mpsl_cb, like below:

static mpsl_timeslot_signal_return_param_t* mpsl_cb(mpsl_timeslot_session_id_t session_id, uint32_t signal)
{
    ...
    
    
    case MPSL_TIMESLOT_SIGNAL_BLOCKED:
    case MPSL_TIMESLOT_SIGNAL_CANCELLED:
        ts_session->request_normal.params.normal.distance_us += ts_session->ts_interval_us;
        return &ts_session->action_next; /*&ts_session->action_end*/

    ...
}

I got an MPSL_ASSERT error shown below.

What does "mpsl_init: MPSL ASSERT: 106, 477" mean?

[00:00:14.527,099] <inf> interconn: mpsl_cb, session 1 signal 6
[00:00:14.527,130] <err> mpsl_init: MPSL ASSERT: 106, 477
[00:00:14.527,160] <err> os: ***** HARD FAULT *****
[00:00:14.527,191] <err> os:   Fault escalation (see below)
[00:00:14.527,191] <err> os: ARCH_EXCEPT with reason 3

[00:00:14.527,221] <err> os: r0/a1:  0x00000003  r1/a2:  0x200025f8  r2/a3:  0x200025f8
[00:00:14.527,252] <err> os: r3/a4:  0x00000000 r12/ip:  0x00000000 r14/lr:  0x00025127
[00:00:14.527,252] <err> os:  xpsr:  0x61000000
[00:00:14.527,282] <err> os: Faulting instruction address (r15/pc): 0x00021668
[00:00:14.527,282] <err> os: >>> ZEPHYR FATAL ERROR 3: Kernel oops on CPU 0
[00:00:14.527,313] <err> os: Current thread: 0x200025f8 (MPSL Work)
[00:00:15.044,433] <err> os: Halting system

RE: How to collaborate a private protocol with BLE.

Håkon Alseth — Thu, 06 Jul 2023 08:44:02 GMT

Hi,

I'm glad to hear that you solved the issue. Hope you have a wonderful day!

Kind regards,

Håkon

RE: How to collaborate a private protocol with BLE.

jhc — Thu, 06 Jul 2023 02:59:40 GMT

Thank you!

The assertion occurred when I stopped the timeslot, it has now been resolved.

RE: How to collaborate a private protocol with BLE.

Håkon Alseth — Wed, 05 Jul 2023 08:59:36 GMT

Hi,

[quote user="jhc"]

What does " mpsl_init: MPSL ASSERT: 112, 2183" mean?

[/quote]

This is an assertion that occurs when a timing error has happened, for instance that the timeslot is exceeding the allocated radio timeslot.

After what call do you get this assertion?

Kind regards,

Håkon

RE: How to collaborate a private protocol with BLE.

jhc — Wed, 05 Jul 2023 08:25:30 GMT

I got a problem:

[00:00:19.786,926] <err> mpsl_init: MPSL ASSERT: 112, 2183
[00:00:19.786,987] <err> os: ***** HARD FAULT *****
[00:00:19.786,987] <err> os:   Fault escalation (see below)
[00:00:19.787,017] <err> os: ARCH_EXCEPT with reason 3

[00:00:19.787,017] <err> os: r0/a1:  0x00000003  r1/a2:  0x20002828  r2/a3:  0x20002828
[00:00:19.787,048] <err> os: r3/a4:  0x00000000 r12/ip:  0x00000000 r14/lr:  0x000260fb
[00:00:19.787,048] <err> os:  xpsr:  0x61000011
[00:00:19.787,078] <err> os: Faulting instruction address (r15/pc): 0x0002263c
[00:00:19.787,078] <err> os: >>> ZEPHYR FATAL ERROR 3: Kernel oops on CPU 0
[00:00:19.787,109] <err> os: Fault during interrupt handling

[00:00:19.787,139] <err> os: Current thread: 0x20002828 (idle)
[00:00:20.463,897] <err> os: Halting system

board: PCA10056

SDK: NCS v2.1.0

What does " mpsl_init: MPSL ASSERT: 112, 2183" mean?

Could you help me to find out what the problem is?

RE: How to collaborate a private protocol with BLE.

Håkon Alseth — Fri, 09 Jun 2023 12:33:41 GMT

Hi,

There's an example of setting up timeslot API here:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.0/nrf/samples/mpsl/timeslot/README.html

As well as a blog post here:

Updating to the MPSL Timeslot interface

Kind regards,

Håkon