RX-888 MKII firmware: SDDC_FX3.img

This image is loaded into the RX-888's Cypress FX3 USB controller each time the receiver is powered
up; nothing is written to the receiver itself. It is a separate program from EasySpotter and EasySDR,
distributed with them unchanged so that an RX-888 works without a separate download.

Image:   SDDC firmware v1.0.3, "20 second watchdog timeout" (reports model RX888r2, firmware 2.2).
         After 20 seconds without USB traffic the receiver resets to its bootloader, so a stalled
         receiver recovers by itself and the engine loads the firmware again.
Source:  https://raw.githubusercontent.com/ka9q/ka9q-radio/main/share/20s_watchdog.img
         (ka9q-radio commit 131d7c598b, 2025-09-14), built from https://github.com/fventuri/SDDC_FX3,
         which derives from https://github.com/ik1xpv/ExtIO_sddc (SDDC_FX3).
SHA-256: a40a7728f98b972558d01a0505ce4784e8e4c56f55a7320c9fd548f1dcbe946f

The SDDC firmware is distributed under the MIT License:

    The MIT License (MIT)

    Copyright (c) 2017-2020 Oscar Steila ik1xpv<at>gmail.com

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.

The image also contains code from the Cypress (now Infineon) EZ-USB FX3 SDK, copyright Cypress
Semiconductor Corporation, distributed in binary form under the SDK's license for use with Cypress
FX3 devices such as the one in the RX-888.
