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  • Case ID: 265827
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LP-UART sample crashes continuously

Anirudh Agarkhed

Setup -

  1. nRF52840-DK
  2. Nordic Connect SDK version 1.5.0
  3. Sample - nrf/samples/peripheral/lpuart
  4. Commented out "uart0" in the board specific overlay
  5. Uncommented console logging from "prj.conf"
  6. Commented "CONFIG_CONSOLE=n" and "CONFIG_UART_CONSOLE=n"
  7. As mentioned in the sample, shorted TX with RX and Request Pin with Response Pin.
  8. Built and flashed the firmware

"MPU FAULT" error is observed, with continuous crashes (console logs are attached).

On "nRF9160 DK" when LP-UART is used instead of UART, there is no communication between nRF9160 and nRF52840 on the DK.

Fullscreen lpuart_log.txt Download 
[:00�:01.259,033] <inf> app: Received data 5 bytes
[00:00:01.758,911] <inf> app: Received data 1 bytes
[00:00:01.858,947] <inf> app: Tx sent 5 bytes
[00:00:01.859,619] <inf> app: Received data 5 bytes
[2021-03-04 23:19:28] [00:00:02.258,575] <err> os: ***** MPU FAULT *****
[2021-03-04 23:19:28] [00:00:02.258,605] <err> os:   Stacking error (context area might be not valid)
[2021-03-04 23:19:28] [00:00:02.258,605] <err> os:   Data Access Violation
[2021-03-04 23:19:28] [00:00:02.258,636] <err> os:   MMFAR Address: 0x20000d9c
[2021-03-04 23:19:28] [00:00:02.258,666] <err> os: r0/a1:  0x0000072c  r1/a2:  0x00000730  r2/a3:  0x00000734
[2021-03-04 23:19:28] [00:00:02.258,666] <err> os: r3/a4:  0x00000738 r12/ip:  0x0000073c r14/lr:  0x00000740
[2021-03-04 23:19:28] [00:00:02.258,697] <err> os:  xpsr:  0x00000600
[2021-03-04 23:19:28] [00:00:02.258,728] <err> os: Faulting instruction address (r15/pc): 0x00000744
[2021-03-04 23:19:28] [00:00:02.258,758] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[2021-03-04 23:19:28] [00:00:02.258,758] <err> os: Current thread: 0x20000318 (unknown)
[2021-03-04 23:19:28] [00:00:02.353,057] <err> fatal_error: Resetting system�*** Booting Zephyr OS build v2.4.99-ncs1  ***
[2021-03-04 23:19:30.758] [0[00:00:01.259,063] <inf> app: Received data 5 bytes
[2021-03-04 23:19:30.762] [00:00:01.758,941] <inf> app: Received data 1 bytes
[2021-03-04 23:19:30.769] [00:00:01.858,978] <inf> app: Tx sent 5 bytes
[2021-03-04 23:19:30.773] [00:00:01.859,649] <inf> app: Received data 5 bytes
[2021-03-04 23:19:30.778] [00:00:02.258,605] <err> os: ***** MPU FAULT *****
[2021-03-04 23:19:30.784] [00:00:02.258,636] <err> os:   Stacking error (context area might be not valid)
[2021-03-04 23:19:30.792] [00:00:02.258,636] <err> os:   Data Access Violation
[2021-03-04 23:19:30.798] [00:00:02.258,666] <err> os:   MMFAR Address: 0x20000d9c
[2021-03-04 23:19:30.804] [00:00:02.258,697] <err> os: r0/a1:  0x0000072c  r1/a2:  0x00000730  r2/a3:  0x00000734
[2021-03-04 23:19:30.814] [00:00:02.258,697] <err> os: r3/a4:  0x00000738 r12/ip:  0x0000073c r14/lr:  0x00000740
[2021-03-04 23:19:30.822] [00:00:02.258,728] <err> os:  xpsr:  0x00000600
[2021-03-04 23:19:30.828] [00:00:02.258,758] <err> os: Faulting instruction address (r15/pc): 0x00000744
[2021-03-04 23:19:30.836] [00:00:02.258,789] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[2021-03-04 23:19:30.844] [00:00:02.258,789] <err> os: Current thread: 0x20000318 (unknown)
[2021-03-04 23:19:30.852] [00:00:02.352,996] <err> fatal_error: Resetting system�*** Booting Zephyr OS build v2.4.99-ncs1  ***
[2021-03-04 23:19:33.117] [0[00:00:01.259,094] <inf> app: Received data 5 bytes
[2021-03-04 23:19:33.122] [00:00:01.758,972] <inf> app: Received data 1 bytes
[2021-03-04 23:19:33.128] [00:00:01.859,008] <inf> app: Tx sent 5 bytes
[2021-03-04 23:19:33.133] [00:00:01.859,680] <inf> app: Received data 5 bytes
[2021-03-04 23:19:33.138] [00:00:02.258,636] <err> os: ***** MPU FAULT *****
[2021-03-04 23:19:33.144] [00:00:02.258,666] <err> os:   Stacking error (context area might be not valid)
[2021-03-04 23:19:33.152] [00:00:02.258,666] <err> os:   Data Access Violation
[2021-03-04 23:19:33.158] [00:00:02.258,697] <err> os:   MMFAR Address: 0x20000d9c
[2021-03-04 23:19:33.164] [00:00:02.258,728] <err> os: r0/a1:  0x0000072c  r1/a2:  0x00000730  r2/a3:  0x00000734
[2021-03-04 23:19:33.173] [00:00:02.258,728] <err> os: r3/a4:  0x00000738 r12/ip:  0x0000073c r14/lr:  0x00000740
[2021-03-04 23:19:33.182] [00:00:02.258,758] <err> os:  xpsr:  0x00000600
[2021-03-04 23:19:33.188] [00:00:02.258,789] <err> os: Faulting instruction address (r15/pc): 0x00000744
[2021-03-04 23:19:33.196] [00:00:02.258,819] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[2021-03-04 23:19:33.204] [00:00:02.258,819] <err> os: Current thread: 0x20000318 (unknown)
[2021-03-04 23:19:33.211] [00:00:02.353,088] <err> fatal_error: Resetting system�*** Booting Zephyr OS build v2.4.99-ncs1  ***
[2021-03-04 23:19:35.476] [0[00:00:01.259,094] <inf> app: Received data 5 bytes
[2021-03-04 23:19:35.481] [00:00:01.758,972] <inf> app: Received data 1 bytes
[2021-03-04 23:19:35.487] [00:00:01.859,008] <inf> app: Tx sent 5 bytes
[2021-03-04 23:19:35.492] [00:00:01.859,680] <inf> app: Received data 5 bytes
[2021-03-04 23:19:35.497] [00:00:02.258,636] <err> os: ***** MPU FAULT *****
[2021-03-04 23:19:35.503] [00:00:02.258,666] <err> os:   Stacking error (context area might be not valid)
[2021-03-04 23:19:35.511] [00:00:02.258,666] <err> os:   Data Access Violation
[2021-03-04 23:19:35.517] [00:00:02.258,697] <err> os:   MMFAR Address: 0x20000d9c
[2021-03-04 23:19:35.523] [00:00:02.258,728] <err> os: r0/a1:  0x0000072c  r1/a2:  0x00000730  r2/a3:  0x00000734
[2021-03-04 23:19:35.532] [00:00:02.258,728] <err> os: r3/a4:  0x00000738 r12/ip:  0x0000073c r14/lr:  0x00000740
[2021-03-04 23:19:35.541] [00:00:02.258,758] <err> os:  xpsr:  0x00000600
[2021-03-04 23:19:35.547] [00:00:02.258,789] <err> os: Faulting instruction address (r15/pc): 0x00000744
[2021-03-04 23:19:35.555] [00:00:02.258,819] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[2021-03-04 23:19:35.563] [00:00:02.258,819] <err> os: Current thread: 0x20000318 (unknown)
[2021-03-04 23:19:35.570] [00:00:02.353,088] <err> fatal_error: Resetting system�*** Booting Zephyr OS build v2.4.99-ncs1  ***
[2021-03-04 23:19:37.834] [0[00:00:01.259,063] <inf> app: Received data 5 bytes
[2021-03-04 23:19:37.840] [00:00:01.758,941] <inf> app: Received data 1 bytes
[2021-03-04 23:19:37.846] [00:00:01.858,978] <inf> app: Tx sent 5 bytes
[2021-03-04 23:19:37.851] [00:00:01.859,649] <inf> app: Received data 5 bytes
[2021-03-04 23:19:37.856] [00:00:02.258,605] <err> os: ***** MPU FAULT *****
[2021-03-04 23:19:37.862] [00:00:02.258,636] <err> os:   Stacking error (context area might be not valid)
[2021-03-04 23:19:37.870] [00:00:02.258,636] <err> os:   Data Access Violation
[2021-03-04 23:19:37.876] [00:00:02.258,666] <err> os:   MMFAR Address: 0x20000d9c
[2021-03-04 23:19:37.882] [00:00:02.258,697] <err> os: r0/a1:  0x0000072c  r1/a2:  0x00000730  r2/a3:  0x00000734
[2021-03-04 23:19:37.891] [00:00:02.258,697] <err> os: r3/a4:  0x00000738 r12/ip:  0x0000073c r14/lr:  0x00000740
[2021-03-04 23:19:37.900] [00:00:02.258,728] <err> os:  xpsr:  0x00000600
[2021-03-04 23:19:37.905] [00:00:02.258,758] <err> os: Faulting instruction address (r15/pc): 0x00000744
[2021-03-04 23:19:37.914] [00:00:02.258,789] <err> os: >>> ZEPHYR FATAL ERROR 2: Stack overflow on CPU 0
[2021-03-04 23:19:37.922] [00:00:02.258,789] <err> os: Current thread: 0x20000318 (unknown)
[2021-03-04 23:19:37.929] [00:00:02.353,057] <err> fatal_error: Resetting system�*** Booting Zephyr OS build v2.4.99-ncs1  ***

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