display_frame_usb_phase_t Struct Reference

Display frame counter and USB frame counter values at frame draw time. More...

Data Fields
uint16_t	display_frame_counter
	Counter that is incremented once per frame draw, i.e. nominally every 40ms.
uint16_t	usb_frame_counter
	Value of the USB frame counter when the frame is drawn, providing a common ms time base for all USB display devices on the same USB bus.

Detailed Description

Display frame counter and USB frame counter values at frame draw time.

Upon frame timer roll-over, the USB frame counter value is latched such that a comparison can be made between multiple devices as to when they are drawing frames relative to each other. If different devices are in phase, then the diffence between the usb frame counter values should be an exact multiple of 40 (i.e. 40 ms or 25 FPS), with the factor of 40 being the difference between the display frame counters.

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The documentation for this struct was generated from the following file:

• frame_timer.h