Torch; Touchpad; Buttons; Audio - Vuzix M400C Developer's Manual

Flash is supported for low-light compensation. The host can enable this over the USB API as
well, see Section 3.3.1.
Mode
Video
Video
Video
Video
Photo
Photo
Photo
Photo
Table 2.1: Supported camera resolutions and frame rates

2.2.3 Torch

The flash LED also supports torch mode. The host can toggle this using the USB API.

2.2.4 Touchpad

M400C enumerates a USB HID [2] mouse that is controlled with the touchpad. For details on the
HID report see Section D.2. The touchpad is capacitive and usable with some gloves, depending
on the thickness. The touchpad supports the following gestures:
• Single-finger up, down, left, right, and tap
• Two-finger up, down, left, right, and tap
• Pinch to zoom in/out
M400C provides a control HID interface that implements the Vuzix USB API. The API func-
tions are detailed in Section 3.1.2.

2.2.5 Buttons

M400C has four physical buttons — three along the top edge, and one on the side. The buttons
are presented to the host as a USB HID keyboard with programmable key codes. The USB API is
used to configure the key codes that are used. For details on the HID report see Section D.1.

2.2.6 Audio

M400C uses a microcontroller to connect the internal audio DSP to USB. This microcontroller
provides a USB Audio Class (UAC) [1] sound card as well as other endpoints, based on the control
mode. For more details see Section 3.2. The sound card receives and sends audio in 2 channel,
6
Resolution Aspect Ratio
3840x2160 16:9
1920x1080 16:9
1920x1080 16:9
2052x1536 4:3
3840x2160 16:9
1920x1080 16:9
4160x3120 4:3
2052x1536 4:3
Revision 7
Frames Per Second
30
60
30
30
n/a
n/a
n/a
n/a
Vuzix Corporation