YASP 0.4

YASP project is a lightweight network protocol for micro controllers.
YASP is a simple and open protocol for building networks with small microcontrollers. It is designed to have a small footprint for easy implementation with minimal hardware resources, but without sacrifice advanced features and future growth.
The protocol scalability is implemented using variable length fields.
The physical layer use the NRZ encoding as in RS-232, but using dominant and recessive bus states to provide a reliable way to detect collisions.
Main features:
- Node adresses: 1 to n bytes
- Medium access: CDMA/CS/NDA (Carrier Sense Multiple Access / Collision Detection / Non-Destructive Arbitration)
- Addressing modes: unicast, broadcast and multicast
- Smallest frame: 6 bytes
- Error detection: CRC16
- Bus signaling: 1-wire "open collector" or 2-wire diferential (CAN transceiver)
- Current PIC implementation: about 480 words of code and 25 bytes of RAM (interrupt driven)
Enhancements:
- Fixed minor framing bugs that affect reception of consecutive frames.
- Added sample code for analog inputs node using 16f876.