Mbed studio: Nuvoton M2354: build failed

[lunchboxwu]

Description of defect

On ARM Mbed Studio, targeting NUMAKER-M2354 v1.1 (NU_M2354), mbed-os-example-blinky (mbed-os 6.17.0) build failed with error log listed below. Tried other sample projects like mbed-os-empty with no avail either.

Target(s) affected by this defect ?

MCU: Nuvoton M2354
Board: NUMAKER-M2354 v1.1 (NU_M2354)

Toolchain(s) (name and version) displaying this defect ?

ARMC6

What version of Mbed-os are you using (tag or sha) ?

mbed-os 6.17.0
Commit: 17dc3dc

What version(s) of tools are you using. List all that apply (E.g. mbed-cli)

Mbed Studio: 1.4.5

How is this defect reproduced ?

1. Log in Mbed Studio
2. Click File > New Program > mbed-os-example-blinky > Add Program
3. Update library to mbed-os-6.17.0 if not yet
4. Specify NUMAKER-M2354 as target hardware
5. Build failed with log:

Image: BUILD/NU_M2354/ARMC6\mbed-os-example-blinky.bin
0002874:CRITICAL:main:cannot read register r0 because core #0 is not halted
Traceback (most recent call last):
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd_main_.py", line 402, in run
self.COMMANDSself._args.cmd
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd_main.py", line 579, in do_flash
file_format=self._args.format)
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\file_programmer.py", line 157, in program
self._loader.commit()
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\loader.py", line 168, in commit
keep_unwritten=self._keep_unwritten)
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\builder.py", line 464, in program
flash_operation = self._chip_erase_program_double_buffer(progress_cb)
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\builder.py", line 706, in _chip_erase_program_double_buffer
self.flash.erase_all()
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\flash.py", line 345, in erase_all
result = self._call_function_and_wait(self.flash_algo['pc_eraseAll'])
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\flash.py", line 604, in _call_function_and_wait
return self.wait_for_completion()
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\flash\flash.py", line 600, in wait_for_completion
return self.target.read_core_register('r0')
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\core\soc_target.py", line 173, in read_core_register
return self.selected_core.read_core_register(id)
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\coresight\cortex_m.py", line 911, in read_core_register
regValue = self.read_core_register_raw(reg_info.index)
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\coresight\cortex_m.py", line 928, in read_core_register_raw
vals = self.read_core_registers_raw([reg])
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\coresight\cortex_m.py", line 949, in read_core_registers_raw
return self._base_read_core_registers_raw(reg_list)
File "c:\Users\lunch\AppData\Local\Mbed Studio\mbed-studio-tools\python\lib\site-packages\pyocd\coresight\cortex_m.py", line 967, in _base_read_core_registers_raw
self.core_number))
pyocd.core.exceptions.CoreRegisterAccessError: cannot read register r0 because core #0 is not halted

[mbedmain]

@lunchboxwu thank you for raising this issue.Please take a look at the following comments:

Could you add some more detail to the description? A good description should be at least 25 words.

NOTE: If there are fields which are not applicable then please just add 'n/a' or 'None'. This indicates to us that at least all the fields have been considered.
Please update the issue header with the missing information.

[0xc0170]

cc @ARMmbed/team-nuvoton

[ccli8]

The error log is related to pyocd. Currently, M2354 board's NuLink2 doesn't support flash or debug on Mbed Studio. Just build code only, that is, on Mbed Sutdio, click Build program, neither Run program nor Debug program. To flash code, go USB drag-and-drop programming.

[cyliangtw]

@ccli8
In fact, M2354 support pyocd in Jun 2021 at:
https://github.com/pyocd/pyOCD/blob/main/pyocd/target/builtin/target_M2354.py

please esnure Nu-Link2 with correct F/W and mbed-studio with up-to-date pyOCD pack.

[cyliangtw]

After checking, Nu-Link2 default F/W is for normal drag-drop & mbed green-tea test support.
For M2354 mbed-studio debug support, you must update as NuLink2_DAPLink_for_numaker_m2354.bin.
How to update Nu-Link2 F/W, please refer to the steps of sub topic DAP Link Interface Firmware Update at: https://os.mbed.com/platforms/NUMAKER-M2354/

[ccli8]

For M2354 mbed-studio debug support, you must update as NuLink2_DAPLink_for_numaker_m2354.bin.

This is necessary. However, Mbed Studio's inbuilt pyOCD version 0.30.2 hasn't supported M2354. Upgrade this inbuilt pyOCD to latest version manually may break Mbed Studio. So Flash & Debug for M2354 are still not supported on Mbed Studio.

[cyliangtw]

Manual upgrade pyocd is relative to python site package, for ex "Python38\Lib\site-packages\pyocd". My environment is pyocd v0.34.0 and get:

[cygwin~zephyr]$ pyocd list --targets | grep Nuvoton
  m2354kjfae                Nuvoton                 M2354KJFAE                              builtin 
  m252kg6ae                 Nuvoton                 M252KG6AE                               builtin 
  m263kiaae                 Nuvoton                 M263KIAAE                               builtin 
  m467hjhae                 Nuvoton                 M467HJHAE                               builtin 
  m487jidae                 Nuvoton                 M487JIDAE                               builtin 

In mbed studio environment console, it should reach python path and could manual update by "pip install pyocd" ?

[ccli8]

In mbed studio environment console, it should reach python path and could manual update by "pip install pyocd" ?

Yes. In Mbed Studio, open builtin console through Terminal > New Terminal and run like pip install -U pyocd to upgrade pyocd. But I don’t suggest doing it because as reported it will break Mbed Studio on pyocd relative files.