Unofficial, collected information about the (discontinued) DxO-One Camera, a tiny camera with a 1" Sony Sensor and f/1.8 lens.

Contribution is very welcome!

1. Hardware
   1. BOM (Hardware Bill-Of-Material)
2. Software
   1. Ambarella RTOS
   2. Linux OS
   3. Firmware binary Analysis
3. Interesting things
   1. Connect DxO-One with Lightning Port to the Android App

More information is available in the wiki.

• ODM Manufacturer: Ability Enterprise Co., Ltd TAIWAN
• FCC ID: 2AAD3JA0J0M0

The device is using Ambarella RTOS as its main OS for controlling the camera hardware and OLED display, and a separate Linux OS to control Wi-Fi functions. This is a quite popular chipset for (older) GoPro and other Action Camera clones as well as many Dashcams.

It seems that in case of the DxO-One, the Linux OS is mostly suspended and only woken up on-demand to connect to Wi-Fi. It might be interesting to achieve a shell to this OS, as it could allow adding wireless features (like FTP-transfer of images or 3rd party Wi-Fi control)

Ambarella OS has a own shell which can accept commands, but as the device is missing a UART-port I didn't find a way so far to connect to it (I suspect that it's possible to switch the USB-Port to UART, but I haven't found a method yet).

On power-on (sliding the lens-cover open or connecting USB), the OS looks for the file autoexec.ash on the SD-Card and, if it exists, executes the shell-commands in it on the RTOS. This allows to do a few interesting things, such as enabling logging, switching USB-Modes, executing commands, etc.

To start investigating the Device, the first step is to re-route logging to a file stored on SD-card.

t dxo console 8
(empty)

The mobile App contains the firmware binary to update devices with older versions.

• Latest version: 3.2.0
• Binary name: DXOSYS_3.2.0.ecef5ef809.BIN
• Path within iPhone app: /DxO ONE.app/Firmware

Unpacking the binary with gopro-fw-tools ( https://github.com/evilwombat/gopro-fw-tools ) reveals 6 files:

• section_0 - Ambarella RTOS
• section_1 - DSP Microcode
• section_2 - Ambarella ROMFS
• section_3 - Linux kernel
• section_4 - Linux Root FS
• section_5 - Firmware-Update OS

There's a Smartphone App accompanying the Device for iOS, and an Android-App for the (later) USB-C version of the camera.

There is a way to connect the Apple-variant of DxO-ONE to the Android App (assumed here that the Android device has a USB-C port, but it would also work with micro-USB).

Possibly, this could work with a lightning port to USB-C adapter (not tested, happy to hear if someone tried it), but there is a way to do this via the microUSB port on the back of the device.

See here: Enable Lightning via microUSB, Disable Lightning via microUSB

Limitations:

1. Wi-Fi connection between Smartphone and DXO-ONE doesn't work (apparently some protocol-issue I didn't look into yet)
2. Not really convenient to use as viewfinder, but good to change settings on the camera (current app-setting is preserved by the camera and kept after disconnecting)