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using pyOCD for resetting K66F board via Raspberry PI

See original GitHub issue

Hi, I want to do soem test automation on a K66 Freedom board and I woud like to use the pyOCD library to reset the board. I wrote the following pythoin script:

from pyOCD.board import MbedBoard

import logging
logging.basicConfig(level=logging.INFO)

board = MbedBoard.chooseBoard(return_first=True)

target = board.target
target.reset()

If I run the script from Windows 10 everything works nicely, but as soon as I am trying to use the script from a Raspberry Pi 3 (using Raspbian) I often have reading errorr like the following one

root@raspberrypi:/home/pi/zamb# python reset_board.py
Traceback (most recent call last):
  File "reset_board.py", line 6, in <module>
    board = MbedBoard.chooseBoard(return_first=True)
  File "/usr/local/lib/python2.7/dist-packages/pyOCD/board/mbed_board.py", line 262, in chooseBoard
    mbed.link.open()
  File "/usr/local/lib/python2.7/dist-packages/pyOCD/pyDAPAccess/dap_access_cmsis_dap.py", line 430, in open
    self._packet_count = self._protocol.dapInfo("PACKET_COUNT")
  File "/usr/local/lib/python2.7/dist-packages/pyOCD/pyDAPAccess/cmsis_dap_core.py", line 91, in dapInfo
    resp = self.interface.read()
  File "/usr/local/lib/python2.7/dist-packages/pyOCD/pyDAPAccess/interface/pyusb_backend.py", line 202, in read
    self.serial_number)
pyOCD.pyDAPAccess.dap_access_api.DeviceError: Device 0311000041114e45000d3003b60f0045a6e1000097969900 read thread exited

Does anybody have any hints on how to overcoem thsi problem?

Cheers, Zambs

Issue Analytics

State:
Created 6 years ago
Comments:5 (2 by maintainers)

Top GitHub Comments

1reaction

c1728p9commented, Oct 10, 2017

Hi @zambs76, I have had a similar experience with any board running on the Raspberry PI. I think it had USB stability issues.

0reactions

flitcommented, Feb 2, 2019

Closing this issue as it seems to be a Raspberry Pi problem with USB. If encountered again, you might try passing --daparg limit_packets=True, which is also necessary when running under some VMs (notably VirtualBox under Windows).

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