Decoder/Annotator

[jbush001]

Add plugins that allow displaying a more readable/higher level interpretation of signals. For example, given clock and data lines for a SPI interface, have a second trace that displays each byte that is transferred.

• Each row can be drag reordered and deleted just like a waveform trace.
• This should allow layering protocols, so a second trace can be built on the first (for example, one decodes serial bytes, the second shows HDLC framing of the first)
• The user can right click to bring up a configuration dialog that selects parameters (e.g. baud rate) and which signals to use.
• Each annotation consists of regions that include a start and end time, and a textual value.

Currently much of the design makes assumptions that each row of the trace is a transition vector. Make this logic more generic so there is a base class for delegating drawing rows (there's some of this already in WaveformPainter, just make it less waveform specific).

[jbush001]

Examples include:

• SPI
• SD car protocol
• UART
• Instruction disassemblers
• Bus protocols (Wishbone/AXI)
• I2C
• CAN

[jbush001]

Basic implementation in c55f4047380136df79cf52a4d3f8b9a9fa9e293a