Reference for unit 'gpioexp'

GPIO expanders

`uses`
`System,`
`Classes,`
`SysUtils,`
`fpgpio,`		General Purpose Input/Output access classes for Free Pascal
`fpspi,`		Free Pascal SPI abstraction layer
`fpi2c,`		Free Pascal I2C abstraction layer
`mcp23017,`		Plain MCP23017 and MCP23S17 access
`bitmanip;`		Bit manipulations

Overview

This unit provides support for GPIO expanders. You will need an GPIO expander if your processor/microcontroller doesn't provide as much GPIO ports as you need.