direction_finding_connectionless_tx - MPU problem/stack

[Avi]

I get error about MPU error stack size while trying to run the example from ncs v2.7.0 on nrf52833dk

I was able to build correctly and I see in the log file that it gets error on MPU for some problems with the cache 

I have not made any changes to the code

I am trying to transmit AOA and receive it on my UBLOX AOA antenna B10.

I was able to run UBLOX code example on nrf52833dk and it works

Thanks

Avi

[Simonr]

Hi

Please provide some details on the error you're seeing. Can you upload the logging file so we can take a look at exactly what this MPU error says and what the stack size error says.

Most likely what is wrong is that you need to increase the CONFIG_MAIN_STACK_SIZE or CONFIG_BT_RX_STACK_SIZE in your prj.conf file.

Best regards,

Simon

[Avi]

00> [00:00:00.249,267] <dbg> mpu: region_init: [2] 0x20003740 0x150b000a
00> [00:00:00.249,298] <dbg> bt_hci_core: hci_tx_thread: Started
00> [00:00:00.249,298] <dbg> bt_hci_core: hci_tx_thread: Calling k_poll with 1 events
00> [00:00:00.249,328] <dbg> mpu: mpu_configure_region: Configure MPU region at index 0x2
00> [00:00:00.249,328] <dbg> mpu: region_allocate_and_init: Program MPU region at index 0x2
00> [00:00:00.249,359] <dbg> mpu: region_init: [2] 0x20004e80 0x150b000a
00> [00:00:00.249,420] <dbg> os: setup_thread_stack: stack 0x20003a80 for thread 0x20000988: obj_size=1280 buf_start=0x20003ac0 buf_size 1216 stack_ptr=0x20003f80
00> [00:00:00.249,450] <dbg> mpu: mpu_configure_region: Configure MPU region at index 0x2
00> [00:00:00.249,450] <dbg> mpu: region_allocate_and_init: Program MPU region at index 0x2
00> [00:00:00.249,481] <dbg> mpu: region_init: [2] 0x20003a80 0x150b000a
00> [00:00:00.249,511] <dbg> mpu: mpu_configure_region: Configure MPU region at index 0x2
00> [00:00:00.249,542] <dbg> mpu: region_allocate_and_init: Program MPU region at index 0x2
00> [00:00:00.249,542] <dbg> mpu: region_init: [2] 0x20004e80 0x150b000a
00> [00:00:00.249,633] <dbg> mpu: mpu_configure_region: Configure MPU region at index 0x2
00> [00:00:00.249,664] <dbg> mpu: region_allocate_and_init: Program MPU region at index 0x2
00> [00:00:00.249,664] <dbg> mpu: region_init: [2] 0x20003400 0x150b000a
00> [00:00:00.248,962] <dbg> mpu: region_init: [2] 0x20006ec0 0x150b000a
00> [00:00:00.249,786] <err> os: ***** MPU FAULT *****
00> [00:00:00.249,816] <err> os: Stacking error (context area might be not valid)
00> [00:00:00.249,816] <err> os: Data Access Violation
00>
00> [00:00:00.249,816] <err> os: MMFAR Address: 0x20003438
00> [00:00:00.249,847] <err> os: r0/a1: 0x95de2e74 r1/a2: 0x9ede1e6b r2/a3: 0xc21aabe9
00> [00:00:00.249,877] <err> os: r3/a4: 0x0902ecd0 r12/ip: 0xff37f464 r14/lr: 0x2953c887
00> [00:00:00.249,877] <err> os: xpsr: 0x21000000
00> [00:00:00.249,908] <err> os: Faulting instruction address (r15/pc): 0x00014c98
00> [00:00:00.249,938] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
00> [00:00:00.249,969] <err> os: Current thread: 0x20000448 (unknown)
00> [00:00:01.373,321] <err> os: Halting system

[Avi]

After increasing the stack size, it started to run:

Update CTE params...success
Periodic advertising params set...success
Enable CTE...success
Periodic advertising enable...success
Extended advertising enable...success
Get extended advertising address...success
Started extended*** Booting nRF Connect SDK v2.7.0-5cb85570ca43 ***
*** Using Zephyr OS v3.6.99-100befc70c74 ***
Starting Direction Finding periodic advertising Beacon Demo
Bluetooth initialization...[00:00:00.257,324] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.257,354] <inf> bt_hci_core: HW Variant: nRF52x (0x0002)
[00:00:00.257,385] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 3.6 Build 99
[00:00:00.257,995] <inf> bt_hci_core: Identity: C0:12:9B:D4:B8:63 (random)
[00:00:00.258,026] <inf> bt_hci_core: HCI: version 5.4 (0x0d) revision 0x0000, manufacturer 0x0059
[00:00:00.258,056] <inf> bt_hci_core: LMP: version 5.4 (0x0d) subver 0xffff
success
Advertising set create...success
Update CTE params...success
Periodic advertising params set...success
Enable CTE...success
Periodic advertising enable...success
Extended advertising enable...success
Get extended advertising address...success
Started extended advertising as C0:12:9B:D4:B8:63 (random)

Here is my prj.conf:

CONFIG_BT=y
CONFIG_BT_DEVICE_NAME="DF Connectionless Beacon App"

CONFIG_BT_EXT_ADV=y
CONFIG_BT_PER_ADV=y
CONFIG_BT_BROADCASTER=y

# Enable Direction Finding Feature including AoA and AoD
CONFIG_BT_DF=y
CONFIG_BT_DF_CONNECTIONLESS_CTE_TX=y
CONFIG_LOG=y
CONFIG_LOG_BACKEND_RTT=y

CONFIG_MAIN_STACK_SIZE=8192

But I dont see any reception by the AOA antenna made by UBLOX (B10). I can receive tags with UBLOX code which are programmed into the same nrf52833dk

UBLOX told me that I can use Nordic tx tag with the code from the ncs - as I am doing now. But there is no recpetion

What can be the reason?