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S.N.A.P is an free and open network protocol. The protocol was primary developed for PLM-24 based
home automation and control systems
but it is a generic protocol and not limited to this. S.N.A.P can be
used in any
type of applications where an easy to learn and light weighted network protocol is needed.
Features.
| - Easy to learn, use and implement. | |
| - Free and open network protocol. | |
| - Free development tools available. | |
| - Scaleable binary protocol with small overhead. | |
| - Requires minimal MCU resources to implement. | |
| - Up to 16.7 million node addresses. | |
| - Up to 24 protocol specific flags. | |
| - Optional ACK/NAK request. | |
| - Optional command mode. | |
| - 8 different error detecting methods (Checksum, CRC, FEC etc.). | |
| - Can be used in master/slave and/or peer-to-peer. | |
| - Supports broadcast messages. | |
| - Media independent (power line, RF, TP, IR etc.). | |
| - Works with simplex, half-, full- duplex links. | |
| - Header is scaleable from 3-12 bytes. | |
| - User specified number of preamble bytes (0-n). | |
| - Works with synchronous and asynchronous communication. | |
| - Works with our free PLM-24 < > TCP/IP Gateway software. |
S.N.A.P network protocol documentation.
You can download the S.N.A.P documentation in PDF-format by clicking on the link below. To view it youwill need the free Acrobat Reader from Adobe. If you don't already have it click on the "Get Acrobat Reader"
icon.
S.N.A.P Version 1.00 (75 KByte).
SNAPSCII Version 0.94 [Draft] (15 KByte).S.N.A.P development tools.
S.N.A.P Lab.
S.N.A.P Test.
S.N.A.P Protocol Encoder/Decoder DLL.
S.N.A.P Linux dynamic library.
S.N.A.P TCP/IP for PalmPilot.
S.N.A.P Serial for PalmPilot.More to come...
S.N.A.P related links.
S.N.A.P vendor list.
Request your own S.N.A.P Vendor ID#.
S.N.A.P DLL bug report form.
S.N.A.P Linux library bug report form.
Debugsoft - Author of S.N.A.P DLL etc.
Carl Walkers S.N.A.P - Linux home page.
S.N.A.P examples.
Below is a list of examples currently available for download. The S.N.A.P examples includes schematicsand well documented source code so they should give you an easy start. In some examples there are room
for much improvement and possibility to add more functionallity, we wanted to keep it as simple as possible
for easy understanding.
WIP = Work In Progress
| Filename | MCU | Ver. | Description |
| SNAP-001.ZIP | BS1-IC | 1.02 | Turn a LED on and off |
| SNAP-002.ZIP | BS1-IC | 1.02 | Lampdimmer node for PLM-24 |
| SNAP-003.ZIP | BS1-IC | 1.02 | Domestic AC current meter with PLM-24 |
| SNAP-004.ZIP | BS1-IC | 1.02 | Simple temperature node for PLM-24 |
| SNAP-005.ZIP | BS1-IC | 1.02 | Simple light measuring node for PLM-24 |
| SNAP-006.ZIP | BS1-IC | 1.02 | Air quality node for PLM-24 |
| SNAP-007.ZIP | BS1-IC | 1.02 | Simple humidity node for PLM-24 |
| SNAP-008.ZIP | BS1-IC | 1.02 | Simple 4-bit input node for PLM-24 |
| SNAP-009.ZIP | BS1-IC | 1.02 | WakeUp alarm node for PLM-24 |
| SNAP-010.ZIP | BS1-IC | 1.02 | Four channel plant moisture sensor I |
| SNAP-011.ZIP | BS2-IC | 1.02 | Turn a LED on and off |
| SNAP-012.ZIP | BS2-IC | 1.02 | Shows how to implement background tasks |
| SNAP-013.ZIP | BS2-IC | 1.02 | PLM-24 to X-10 Gateway |
| SNAP-014.ZIP | BS2-IC | 1.02 | 8-bit parallel input node for PLM-24 |
| SNAP-015.ZIP | BS2-IC | WIP | Programmable light monitor node for PLM-24 |
| SNAP-016.ZIP | 89C2051 | 1.02 | Turn a LED on and off |
| SNAP-017.ZIP | BS2-IC | 1.02 | IR detector alarm node for PLM-24 |
| SNAP-018.ZIP | BS2-IC | 1.02 | Four channel relay node with local control |
| SNAP-019.ZIP | BS2-IC | 1.02 | 1-8 zones security system node for PLM-24 |
| SNAP-020.ZIP | BS2-IC | WIP | DCF-77 atomic clock node for PLM-24 |
| SNAP-021.ZIP | BS2-IC | 1.02 | Fire alarm node for PLM-24 |
| SNAP-022.ZIP | BS1-IC | 1.02 | 1-channel 8-bit A/D converter node |
| SNAP-023.ZIP | 89C2051 | 1.02 | Simple 16 x 1 LCD terminal node for PLM-24 |
| SNAP-024.ZIP | 89C2051 | 1.02 | Simple 16 x 1 LCD info node for PLM-24 |
| SNAP-025.ZIP | 89C2051 | 1.02 | S.N.A.P packet spy node for PLM-24 | SNAP-026.ZIP | BS2-IC | 1.00 | Testprogram for S.N.A.P Serial for PalmPilot |
| - | - | - | More to come... |
User supplied S.N.A.P examples.
Below is a list of examples submitted by S.N.A.P users. If you have any examples that you would like toshare with others feel free to e-mail them to us and we will add it to the list. All credits should go to the author
of respectively example.
| Filename | Author | Description |
| SNAPAVR.ZIP | Mike Eitel | AVR example using a 90S8515 and STK200 development kit |
| SNAP-IO.ZIP | Claus Kuehnel | BASCOM-AVR example turning simple LED ON/OFF |
| SNAP-MON.ZIP | Claus Kuehnel | BASCOM-AVR example displays S.N.A.P packets on LCD |
| PICTOOLS.ZIP | Emiliano Castricini | Implement S.N.A.P in PIC assembler includes Windows 9x utility |
| AVRSNAP01.ZIP | Göran Nordahl | S.N.A.P AVR assembler example for Atmel AT90Sxxxx |
| AVRSNAP02.ZIP | Göran Nordahl | Interrupt driven node that implements S.N.A.P in AVR-assembler |
| AVRSNAP03.ZIP | Göran Nordahl | S.N.A.P AVR assembler example for Atmel AT90Sxxxx |
| AVRSNAP04.ZIP | Göran Nordahl | S.N.A.P AVR assembler example for Atmel AT90Sxxxx |
| C-HEADER.ZIP | Frits Senders | C-header file for SNAP.DLL 1.10 |
| CC139.ZIP | Colin O'Flynn | Source code and PCB to S.N.A.P article in Circuit Cellar #139 |
| GCC01.ZIP | Colin O'Flynn | CHKSUM, CRC8 and CRC16 routines in AVR-GCC |
| - | - | More to come... |
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