Nicla mBed Hardfault.

[gutzchi]

Hello.

I have been redicted from an issue I posted on the Arduino mbed repository: https://github.com/arduino/ArduinoCore-mbed/issues/372

I have tried to use upload the example codes of the Nicla Sense ME board with very little success. The simplest example code is the following one:

#include "Nicla_System.h"

void setup() {
  Serial.begin(115200);
  while(!Serial);
  
  nicla::begin();
  nicla::leds.begin();
}

void loop() {
  nicla::leds.setColor(green);
  delay(1000);
  nicla::leds.setColor(off);
  delay(1000);
} 

This is the `platformio.ini' file:

[env:nicla_sense_me]
platform = nordicnrf52
board = nicla_sense_me
framework = arduino
monitor_speed=115200
debug_tool = cmsis-dap
upload_protocol = cmsis-dap

And this is the compiler log: build_log_nicla.txt

If I debug it, it gets stuck when calling the nicla::begin() function, when creating and starting the thread (line 31): https://github.com/arduino/ArduinoCore-mbed/blob/838c70238aaee11c7a8a32cf570de4f51ce240f7/libraries/Nicla_System/src/Nicla_System.cpp#L25-L35

This seems to be a problem of Platformio as it runs perfectly on the Arduino IDE. They use a different toolchain, by the way.

Moreover, if the Arduino_BHY2.h library is included, I get the following message form the OS:

++ MbedOS Fault Handler ++

FaultType: HardFault

Context:
R   0: 00000000
R   1: 2000345C
R   2: 00000001
R   3: 20000BF5
R   4: 00002000
R   5: 00000000
R   6: 20000BEC
R   7: 00000000
R   8: 00000000
R   9: 00000000
R  10: 00000000
R  11: 00000000
R  12: 00016E79
SP   : 20003408
LR   : 00010753
PC   : 00010764
xPSR : 41000000
PSP  : 200033E8
MSP  : 2000FFC0
CPUID: 410FC241
HFSR : 40000000
MMFSR: 00000000
BFSR : 00000000
UFSR : 00000001
DFSR : 00000000
AFSR : 00000000
Mode : Thread
Priv : Privileged
Stack: PSP

-- MbedOS Fault Handler --

++ MbedOS Error Info ++
Error Status: 0x80FF013D Code: 317 Module: 255
Error Message: Fault exception
Location: 0x10764
Error Value: 0x200087B4
Current Thread: main Id: 0x2000345C Entry: 0x17EE3 StackSize: 0xC00 StackMem: 0x20002838 SP: 0x20003408
For more info, visit: https://mbed.com/s/error?error=0x80FF013D&tgt=NICLA
-- MbedOS Error Info --

This is the corresponding build log: build_log_BHY2.txt

If I debug it, the program crashes in the same lines (which I believe should not be executed as the macro NO_NEED_FOR_WATCHDOG_THREAD is defined: https://github.com/arduino/ArduinoCore-mbed/blob/838c70238aaee11c7a8a32cf570de4f51ce240f7/libraries/Nicla_System/src/Nicla_System.cpp#L3-L9

Please, could someone help me with this?

[valeros]

Hi @gutzchi ! Could you please try the following configuration in your platformio.ini:

[env:nicla_sense_me]
platform = nordicnrf52
board = nicla_sense_me
framework = arduino
monitor_speed=115200
lib_archive = no

[gutzchi]

Hi @valeros. I have tried this configuration in both cases and the result is exactly the same.

[epatel]

Have the same problem. I have also used the platformio upload command with the Arduino IDE produced binary and that worked fine so I don't think there is a problem with the upload but rather the binary itself.

In the debugger I see it enter nicla::begin() and never return. It looks like it is still doing things there as pausing it a few times will show different callstacks.

[asuar078]

I notice that in ~/.platformio/packages/framework-arduino-mbed/libraries/Nicla_System/src/Nicla_System.cpp the nicla::begin() function does not have a return statements. I fixed my issue by adding return true; on line 35.

[epatel]

@asuar078 That helped me too! Good catch! Thanks!

[hkayann]

Seems like we need to manually update libs. In this case copying the content of actual source, to platformio lib file seems like the most stable solution.