How do i put a photon chip into safe mode using serial?

[Hammerhead]

Dfu baudrate 28800
Listening mode baudrate 14400

Is there a baud rate i can set to put photon in safe mode?

[nrobinson2000]

You can’t do it with just a baud rate, but you can do it by first putting the photon in listening mode with 28800, sending L over serial and then sending x over serial.

(L will put the photon in safe listening mode, and x will reboot the device into normal safe mode if I recall.)

Here’s the thread where I originally found this solution:

Induce safe mode via usb

This works well, thanks. I can now do this to induce safe mode via USB: $ po serial open -d /dev/ttyACM0 $ echo "L" > /dev/ttyACM0 $ echo "x" > /dev/ttyACM0 I’m going to incorporate these into a single command like po safe open.

This newer thread also provides an option:

Induce safe mode from user code

System.enterSafeMode(); https://docs.particle.io/reference/device-os/firmware/boron/#entersafemode- By USB, as long as the device is running 0.9.0 or later and you have an up-to-date Particle CLI: particle usb safe-mode https://docs.particle.io/reference/developer-tools/cli/#particle-usb-safe-mode By USB serial, connecting at 28800 baud will go into listening mode, then sending the L (uppercase) command by serial will cause it to go into safe listening mode. It will look like listening mo…

[ScruffR]

You can also use USB Control Requests (e.g. via particle usb safe-mode) to make the device other things than just enter DFU or Listening Mode.

>particle usb --help
Control USB devices
Usage: particle usb <command>
Help:  particle help usb <command>

Commands:
  list             List the devices connected to the host computer
  start-listening  Put a device into the listening mode
  stop-listening   Make a device exit the listening mode
  safe-mode        Put a device into the safe mode
  dfu              Put a device into the DFU mode
  reset            Reset a device
  configure        Update the system USB configuration