57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
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/***************************************************
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This is a library for the MCP23008 i2c port expander
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These displays use I2C to communicate, 2 pins are required to
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interface
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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Written by Limor Fried/Ladyada for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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****************************************************/
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#ifndef _ADAFRUIT_MCP23008_H
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#define _ADAFRUIT_MCP23008_H
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// Don't forget the Wire library
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#ifdef __AVR_ATtiny85__
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#include <TinyWireM.h>
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#else
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#include <Wire.h>
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#endif
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class Adafruit_MCP23008 {
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public:
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void begin(uint8_t addr);
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void begin(void);
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void pinMode(uint8_t p, uint8_t d);
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void digitalWrite(uint8_t p, uint8_t d);
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void pullUp(uint8_t p, uint8_t d);
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uint8_t digitalRead(uint8_t p);
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uint8_t readGPIO(void);
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void writeGPIO(uint8_t);
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private:
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uint8_t i2caddr;
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uint8_t read8(uint8_t addr);
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void write8(uint8_t addr, uint8_t data);
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};
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#define MCP23008_ADDRESS 0x20
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// registers
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#define MCP23008_IODIR 0x00
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#define MCP23008_IPOL 0x01
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#define MCP23008_GPINTEN 0x02
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#define MCP23008_DEFVAL 0x03
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#define MCP23008_INTCON 0x04
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#define MCP23008_IOCON 0x05
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#define MCP23008_GPPU 0x06
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#define MCP23008_INTF 0x07
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#define MCP23008_INTCAP 0x08
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#define MCP23008_GPIO 0x09
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#define MCP23008_OLAT 0x0A
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#endif
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