Segmentation fault with pynrfjprog

RE: Segmentation fault with pynrfjprog

Andy — Tue, 20 Feb 2018 15:31:34 GMT

It seems to have solved the problem. I'll keep testing for a while more and I'll mark your reply as an answer once I'm sure :) Otherwise, I'll update again here. Thanks!

RE: Segmentation fault with pynrfjprog

Simen August Tinderholt — Tue, 20 Feb 2018 13:40:41 GMT

Sorry, that should be API.API('NRF52').

RE: Segmentation fault with pynrfjprog

Andy — Tue, 20 Feb 2018 13:34:52 GMT

With that code I get this error:

# Opening API with device family NRF52.
Traceback (most recent call last):
  File "main.py", line 309, in <module>
    main()
  File "main.py", line 304, in main
    flash_batch(programmer, uart)
  File "main.py", line 203, in flash_batch
    result = flash_program(programmer)
  File "main.py", line 82, in flash_program
    with API('NRF52') as api:
TypeError: 'module' object is not callable

RE: Segmentation fault with pynrfjprog

Simen August Tinderholt — Tue, 20 Feb 2018 09:34:11 GMT

If that doesn't work you might be dealing with a memory leak in the Segger DLL.

You can fix that by instantiating a single API, and passing it around, instead of creatnig a new one for every device.

RE: Segmentation fault with pynrfjprog

Simen August Tinderholt — Tue, 20 Feb 2018 09:22:47 GMT

Hm, I can't see anything wrong with the script, but the garbage collection in python can be unreliable. Can you try:

with API('NRF52') as api:
    api.connect_to_emu_without_snr(1000)

    # Erase all the flash of the device.
    print "# Erasing all flash in the microcontroller."
    api.erase_all()

    # Parse the hex file with the help of the HEX module
    print "# Parsing hex file into segments."
    test_program = Hex.Hex(hex_file_path)

    # Program the parsed hex into the device's memory.
    print('# Writing %s to device.' % hex_file_path)
    for segment in test_program:
        api.write(segment.address, segment.data, True)

    # Free resources
    test_program = None

    print "# Writing serial number to memory address 0x10001080, use NVMC"
    api.write_u32(0x10001080, ctypes.c_uint32(serial_number).value, True)

    # Read back the serial number
    print "# Programmed serial number: " + hex(api.read_u32(0x10001080))

    # Reset the device and run.
    api.sys_reset()
    api.go()
    print "# Application running."

print "# Programming finished."
return 0

That should ensure that the close() is called whatever happens (it's always called when exiting the with statement), and (maybe) help the python garbage collector out.