mdf::CgFlag Namespace Reference

Channel group flags.

Variables
constexpr uint16_t	VlsdChannel = 0x0001
	Flag is used to indicate the this block is a variable length CG block.
constexpr uint16_t	BusEvent = 0x0002
	Bus event flag.
constexpr uint16_t	PlainBusEvent = 0x0004
	Plain bus event flag.
constexpr uint16_t	RemoteMaster = 0x0008
	Remote master flag.
constexpr uint16_t	EventSignal = 0x00010
	Event signal group. The group store events not values.

Variable Documentation

VlsdChannel

uint16_t mdf::CgFlag::VlsdChannel = 0x0001

constexpr

If a CG block is marked as a variable length data (VLSD) block. This technique is used when writing byte arrays with variable length. Bus recorders uses this technique instead of using SD blocks.

The problem with SD blocks is that they need to be temporary stored in primary memory. For long time recording this is not acceptable due to the risk of loss of power during th measurement.

The draw-back is that the VLSD CG block requires some extra internal functionality both for reading and writing.