Specifications

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You can use a special type of comment called a “docstring”............................................................ 21

4. SNAPpy versus Python...................................................................................................................... 22

Modules.............................................................................................................................................. 22

Variables ............................................................................................................................................ 22

Functions............................................................................................................................................ 22

Data Types ......................................................................................................................................... 22

Keywords ........................................................................................................................................... 23

Operators............................................................................................................................................ 23

Slicing ................................................................................................................................................ 23

Concatenation .................................................................................................................................... 23

Subscripting ....................................................................................................................................... 23

Expressions ........................................................................................................................................ 24

Python Built-ins ................................................................................................................................. 24

Print.................................................................................................................................................... 24

5. SNAPpy Application Development................................................................................................... 25

Event-Driven Programming............................................................................................................... 25

SNAP Hooks...................................................................................................................................... 25

Transparent Data (Wireless Serial Port) ............................................................................................ 27

Scripted Serial I/O (SNAPpy STDIO)............................................................................................... 27

The Switchboard ................................................................................................................................ 27

Debugging.......................................................................................................................................... 30

Sample Application – Wireless UART.............................................................................................. 30

Code Density...................................................................................................................................... 33

6. Advanced SNAPpy Topics ................................................................................................................ 34

Interfacing to external CBUS slave devices ...................................................................................... 34

Interfacing to external SPI slave devices........................................................................................... 35

Interfacing to external I

C slave devices ........................................................................................... 38

Interfacing to multi-drop RS-485 devices.......................................................................................... 39

Encryption between SNAP nodes...................................................................................................... 40

Recovering an Unresponsive Node.................................................................................................... 41

7. SNAPpy – The API............................................................................................................................ 43

Alphabetical SNAP API .................................................................................................................... 43

bist() – Synapse internal use only.................................................................................................. 43

call(rawOpcodes, functionArgs…) – Call embedded C code....................................................... 43

callback(callback, remoteFunction, remoteFunctionArgs…).................................................... 43

callout(nodeAddress, callback, remoteFunction, remoteFunctionArgs…) ............................... 44

cbusRd(numToRead) – Read bytes in from the CBUS................................................................ 45

cbusWr(str) – Write bytes out to the CBUS................................................................................. 45

chr(number) – Generate a single-character-string........................................................................ 45

crossConnect(endpoint1, endpoint2) – Tie two endpoints together ............................................ 45

eraseImage() – Erase any SNAPpy image from the node ............................................................ 46

errno() – Read and reset latest error code..................................................................................... 46

flowControl(uart, isEnabled, isTxEnable) – Enable/disable flow control.................................. 47

getChannel() – Get which channel the node is on ........................................................................ 48

getEnergy() – Get energy reading from current channel .............................................................. 49

getI2cResult() – Get status code from most recent I

C operation ................................................ 50

Page 4 of 202 SNAP Reference Manual Document Number 600-0007K