There will be an error message when connecting.

[weiliwang]

Dear nRF experts.
We are a module manufacturer and we have designed an nRF45L15 module.
We are doing a series of verifications. When we were doing the connection test, we found that there was a problem with our module. We compiled peripheral_hr and downloaded it to our module. When using a mobile phone to connect to this module, there will be an error message. , shown as follows:

[00:00:24.960,528] <wrn> bt_conn: conn 0x200022f8 failed to establish. RF noise?
Disconnected, reason 0x3e
Stop blinking LED.
Starting Legacy Advertising (connectable and scannable)
Start blinking LED...
Connected
Stop blinking LED.
[00:00:27.924,260] <err> mpsl_init: MPSL ASSERT: 1, 1239
[00:00:27.924,273] <err> os: ***** HARD FAULT *****
[00:00:27.924,277] <err> os:   Fault escalation (see below)
[00:00:27.924,282] <err> os: ARCH_EXCEPT with reason 3

[00:00:27.924,289] <err> os: r0/a1:  0x00000003  r1/a2:  0x00000000  r2/a3:  0x00013313
[00:00:27.924,296] <err> os: r3/a4:  0x00000003 r12/ip:  0x20002348 r14/lr:  0xffffffff
[00:00:27.924,300] <err> os:  xpsr:  0x010000f5
[00:00:27.924,304] <err> os: Faulting instruction address (r15/pc): 0x0001d14c
[00:00:27.924,321] <err> os: >>> ZEPHYR FATAL ERROR 3: Kernel oops on CPU 0
[00:00:27.924,325] <err> os: Fault during interrupt handling

[00:00:27.924,347] <err> os: Current thread: 0x20002ea8 (unknown)
[00:00:27.999,362] <err> os: Halting system

However, if we use the dk board of nRF54L15 to download this firmware, everything will be normal.

Could this be an issue with our RF?
We have verified that the center frequency point and TX POWER of our radio frequency are close to the DK BOARD.

[Kazi Afroza Sultana]

Hello,

Do you have external load capacitors for both crystals? You can avoid using FICR values. I think we need to look at your board. Could you please share the design file?

[Weili]

Hi Kazi.

Thank you for your reply, sorry, because we have resubmitted the second PCB,
We were adjusting the PCB last week.
We use external load capacitors and match them to 18pf. At this time, we see that everything is fine at the center frequency of CW. We can see the broadcast using the HR sample code, but when we try to connect, it fails to connect and displays MPSL assert.
Let's try to write hard code. If we change it as follows, we can connect smoothly.

Do you have any suggestions on this issue?

If you want to review our schematics and board layouts, how should I submit them to you?

SDK V2.8

[Kazi Afroza Sultana]

Hello Weili,

You can upload the hardware file here. I have made your case private.

[Kazi Afroza Sultana]

Hello Weili,

You can upload the hardware file here. I have made your case private.