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Universal Silicon Labs Flasher

Automatically communicates with radios over CPC, EZSP, or Spinel to enter the bootloader and then flashes a firmware image with XMODEM.

Installation

$ pip install universal-silabs-flasher

Usage

Usage: universal-silabs-flasher [OPTIONS] COMMAND [ARGS]...

Options:
  -v, --verbose
  --device PATH_OR_URL           [required]
  --bootloader-baudrate NUMBERS  [default: 115200]
  --cpc-baudrate NUMBERS         [default: 460800, 115200, 230400]
  --ezsp-baudrate NUMBERS        [default: 115200]
  --spinel-baudrate NUMBERS      [default: 460800]
  --probe-method TEXT            [default: bootloader, cpc, ezsp, spinel]
  --bootloader-reset [yellow|ihost|slzb07|sonoff]
  --help                         Show this message and exit.

Commands:
  dump-gbl-metadata
  flash
  probe
  write-ieee

Flashing firmware

For safety, firmware GBL image files are validated and their checksums verified both before sending, and by the device bootloader itself.

In addition to validating the firmware image, the version number of the firmware image currently running on the device is read.

  • If the provided firmware image type does not match the running image type, the firmware will not be flashed. Cross-flashing can be enabled with --allow-cross-flashing.
  • If the provided firmware image is a lower version than the currently running image, the downgrade will not be allowed. Downgrades can be enabled with --allow-downgrades.
  • To always upgrade/downgrade firmware to a specific version (i.e. as the entry point for an addon bundling firmware), use --ensure-exact-version.
  • All of the above logic can be skipped with --force.

Yellow

The Yellow's bootloader can always be activated with the --bootloader-reset yellow option:

$ universal-silabs-flasher \
    --device /dev/ttyAMA1 \
    --bootloader-reset yellow
    flash \
    --firmware NabuCasa_RCP_v4.1.3_rcp-uart-hw-802154_230400.gbl \

SkyConnect

The SkyConnect will be rebooted into its bootloader from the running application: either EmberZNet or CPC.

$ universal-silabs-flasher \
    --device /dev/cu.SLAB_USBtoUART \
    flash \
    --firmware NabuCasa_SkyConnect_EZSP_v7.1.3.0_ncp-uart-hw_115200.gbl

Writing IEEE address

Ensure a target device running EmberZNet firmware has the correct node IEEE address:

$ universal-silabs-flasher \
    --device /dev/cu.SLAB_USBtoUART \
    write-ieee \
    --ieee 00:3c:84:ff:fe:92:bb:2c

The IEEE address can also be specified without colons: --ieee 003c84fffe92bb2c.

If the current device's IEEE address already matches the provided one, the command will not write it unnecessarily.