controller unresponsive on serial port and in dfu mode on usb port

We have a SDC2130S that will occasionally stop functioning. When it stops functioning, the serial port will become unresponsive and the USB port enters into dfu mode (the kernel log of the usb port enumeration is below). The only way we have figure out how to fix it is to use the roborun software to reload the firmware.

What could be causing this to happen? Is there some command sequence that will put it into this mode? Is the firmware getting corrupted somehow? Any ideas would be helpful.



[ 59.590725] usb 2-5.6: new full-speed USB device number 10 using xhci_hcd
[ 59.608010] usb 2-5.6: New USB device found, idVendor=0483, idProduct=df11
[ 59.608015] usb 2-5.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 59.608017] usb 2-5.6: Product: STM32 DFU
[ 59.608019] usb 2-5.6: Manufacturer: STMicroelectronics
[ 59.608021] usb 2-5.6: SerialNumber: U\xffffffc3\xffffffbf\xffffffbfs\x06g\xffffffc2\xffffff85\xffffff85SI\x13\x14\x15g
[ 60.668109] usb 2-5.6: USB disconnect, device number 10
[ 60.870339] usb 2-5.6: new full-speed USB device number 11 using xhci_hcd
[ 60.888002] usb 2-5.6: New USB device found, idVendor=0483, idProduct=df11
[ 60.888005] usb 2-5.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 60.888006] usb 2-5.6: Product: STM32 DFU
[ 60.888008] usb 2-5.6: Manufacturer: STMicroelectronics
[ 60.888009] usb 2-5.6: SerialNumber: U\xffffffc3\xffffffbf\xffffffbfs\x06g\xffffffc2\xffffff85\xffffff85SI\x13\x14\x15g

I have been using USB for a long time without any issues.  However, it just happened now that the COM port (through USB) disappeared and it showed as STM32 DFU under Other Devices in Windows 7 device manager.  Any idea how to get it back?

Hi Niko,

I am not sure what happened. It was not the first two for sure when it happened. I did more working using another board. I suspect it may be related to my script (see below). It somehow went in to DFU mode. I see that you replied to my other more detailed post. I will reply there. Thanks.

SetCommand(_ESTOP, 1, 0)
If GetValue(_DIN, 3) > 0 then
SetCommand(_HOME, 1)
SetCommand(_MMOD, 1, 2)
SetCommand(_G, 1, 0)
End If
If GetValue(_DIN, 4) > 0 then
SetCommand(_HOME, 2)
SetCommand(_MMOD, 1, 2)
SetCommand(_G, 1, 0)
End If
SetCommand(_MG, 1, 0)