Random Enumeration Behaviour

[Markus Gritsch]

Hi,

when I have the pyboard connected to the PC and have no SD card inserted, every time I press the reset button, the board enumerates fine and the virtual drive shows up in Windows Explorer.

When I do the same with an SD card inserted, I get one of the following three situations after pressing the reset button:
1. The device enumerates and the internal flash is shown as a drive in the Explorer.
2. The device enumerates and the SD card appears as a drive in the Explorer.
3. The device does not enumerate correctly and no drive shows up in the Explorer.

Which of the three results I get seems to be random.

This behaviour does still occure with an updated firmware version (pybv10-2014-06-11-v1.0.1-211-g58cbb4d.dfu).

I get this on two different Windows 7 machines I use, and with two SD cards (both 2 GB, one SanDisk, one no-name).

[fma]

I have the same behaviour under linux (I think I have the same firmware as you). I tried with a 1GB SD, and a 8GB SD.

[Markus Gritsch]

I filed a bug report: https://github.com/micropython/micropython/issues/687

[Markus Gritsch]

This thread discusses probably the same problem: http://forum.micropython.org/viewtopic.php?f=2&t=95

[Markus Gritsch]

I filed a bug report: https://github.com/micropython/micropython/issues/687

This issue seems to be fixed in recent Micro Python versions.