ttyACM0 speed bug
On some SCBs with some usb cable the ttyACM0 terminal (serial gadget is not responding)
The following have been checked
- On some board with 30cm cable it works but not with 2m cable
- The external oscillator and power supply has been measured on working and "buggy" boards and they are in the same range.
- The same USB connector is working perfectly when using the mch_flasher (usb-loader)
- The ARM always receive the message from the PC