WBUS-DIP28 Usb FS port issue (SOLVED)

[pythoncoder]

Using the USB FS port the following crashes the board after a ctrl-D (firmware downloaded this morning)

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MicroPython v1.10-258-g83f3c29d3-dirty on 2019-04-03; PYBD_SF2W with STM32F722IEK
Type "help()" for more information.
>>> import network
>>> s = network.WLAN()
>>> s.active(True)
autoconnect: /dev/ttyACM0 action: remove # and so on, the board has crashed

[chuckbook]

I'm assuming you are working with a DIP28 board. Note that the default current limit for the USB-FS connector is 100 mA.
PE1 (EN1) should read 1, PE6 (EN2) should read 0 for 500mA current limit.

[Damien]

It may be that you have an old bootloader which didn't enable 500mA by default, by pulling Pin(W23) high. To test this, do a fresh hard reset and check the state of pin W23. If it's low then it's 100mA max.

It's possible to update mboot from the pyboard REPL:

1. download mboot from https://micropython.org/resources/firmw ... _mboot.dfu ; replace SFx with SF2, SF3 or SF6 depending on your board version
2. download https://github.com/micropython/micropyt ... wupdate.py
3. put both files on the PYBD's filesystem
4. on the PYBD execute: import fwupdate; fwupdate.update_mboot('PYBD_SFx_W4F2_mboot.dfu')

BE CAREFUL TO USE THE CORRECT MBOOT FIRMWARE FOR SF2/SF3/SF6!

[pythoncoder]

Both my boards read low. Will update tomorrow and report back if the problem persists.

[EDIT]
This is now fixed. Thank you, Damien.

[chuckbook]

You may test 500mA limit without updating mboot by putting:

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EN1 = pyb.Pin('E1', mode=pyb.Pin.IN, pull=pyb.Pin.PULL_UP)

in boot.py

[pythoncoder]

I strongly recommend that users do update mboot if necessary. I struggled all day with nondeterministic behaviour connected with the startup of code after reset or power cycle. All but one problem went away since I updated. The last could just be a bug in my code.