Have two Teensys fail within hours. One is flashing 8 and then 9 times. Ideas? There is no serial nor bootloader port.

M

MichaelMC

Well-known member
What both have in common as that they were both recently updated to its latest firmware with a new install of Teensydunio 1.61 under Arduino 1.8.19, but probably unrelated.
On one, I've tried holding the program button for 16seconds. Blink reloads but the Serial port(s) never appear (Device Man. & Arudino IDE). Tried on multiple computers to no avail.

Power rails seem fine. 3.3v is as it should, vin is at 4.66v.
Any ideas?
 
Just to make sure, the button should only be held until the LED blinks once, then released. Holding for 16 seconds may actually be too long, resulting in cancelling the factory reset process, rather than initiating the factory reset process.

Hope that helps . . .

Mark J Culross
KD5EXT
 
MichaelMC said:
On one, I've tried holding the program button for 16seconds. Blink reloads but the Serial port(s) never appear (Device Man. & Arudino IDE).
Click to expand...

The default LED blink program uses RawHID, not Serial. In Arduino IDE, it should appear in Tools > Ports and the drop-down of detected hardware in Arduino IDE 2.3.10. But it will NOT be a COM port (Windows) or Serial device (Linux, MacOS) because it is using HID protocol. Likewise in Windows Device Manager, it should appear in Human Interface Devices but not Ports (COM & LPT) because it is HID protocol.

If your computer detects nothing at all, nothing shown in Arduino IDE Tools > Port menu, and Windows Device Manager does not redraw when Teensy begins the blink program (nor any chime sounds, if your PC has the default setting to make chime sound when USB devices are connected and unplugged), the most common cause of nothing at all detected is a bad USB cable. Leftover power-only cables which have only 2 wires for power and no wires for data are a very common problem.
 
Thank you guys. Have both up and running. Problem seems to have been situated between the chair and the computer with everything mentioned above. New Cable, holding program for too long and yes, there they are in RawHID.

Cheers!
 
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