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RPiMCP23S17
============

This is a Python module that abstracts the GPIO expander MCP23S17. It is intended for the use on a Raspberry Pi.

Provided Functions
------------------

As a quick overview, the module provides the following functions. Refer to the module documentation for details:

 - open
 - close
 - setPullupMode
 - setDirection
 - digitalRead
 - digitalWrite
 - writeGPIO
 - readGPIO

Installation
------------

If not already done, you need to install PIP via::

    sudo apt-get install python-dev python-pip

Install from `PyPI <https://pypi.python.org/pypi/RPiMCP23S17>`_::

    pip install RPiMCP23S17

Example
-------

The following demo peridically toggles all pins of two MCP23S17 components::

    from RPiMCP23S17.MCP23S17 import MCP23S17
    import time

    mcp1 = MCP23S17(bus=0x00, ce=0x00, deviceID=0x00)
    mcp2 = MCP23S17(bus=0x00, ce=0x00, deviceID=0x01)
    mcp1.open()
    mcp2.open()

    for x in range(0, 16):
        mcp1.setDirection(x, mcp1.DIR_OUTPUT)
        mcp2.setDirection(x, mcp1.DIR_OUTPUT)

    print "Starting blinky on all pins (CTRL+C to quit)"
    while (True):
        for x in range(0, 16):
            mcp1.digitalWrite(x, MCP23S17.LEVEL_HIGH)
            mcp2.digitalWrite(x, MCP23S17.LEVEL_HIGH)
        time.sleep(1)

        for x in range(0, 16):
            mcp1.digitalWrite(x, MCP23S17.LEVEL_LOW)
            mcp2.digitalWrite(x, MCP23S17.LEVEL_LOW)
        time.sleep(1)
        
        # the lines below essentially have the same effect as the lines above
        mcp1.writeGPIO(0xFFF)
        mcp2.writeGPIO(0xFFF)
        time.sleep(1)
        
        mcp1.writeGPIO(0x000)
        mcp2.writeGPIO(0x0000)
        time.sleep(1)