Adafruit_MCP23017.h

00001 /***************************************************
00002   This is a library for the MCP23017 i2c port expander
00003 
00004   These displays use I2C to communicate, 2 pins are required to
00005   interface
00006   Adafruit invests time and resources providing this open source code,
00007   please support Adafruit and open-source hardware by purchasing
00008   products from Adafruit!
00009 
00010   Written by Limor Fried/Ladyada for Adafruit Industries.
00011   BSD license, all text above must be included in any redistribution
00012  ****************************************************/
00013 
00014 #ifndef _Adafruit_MCP23017_H_
00015 #define _Adafruit_MCP23017_H_
00016 
00017 #include "mbed.h"
00018 
00019 class Adafruit_MCP23017
00020 {
00021 public:
00022     Adafruit_MCP23017(I2C *master);
00023     ~Adafruit_MCP23017(){};
00024 
00025     void pinMode(uint8_t p, bool input_mode);
00026     void digitalWrite(uint8_t p, bool high);
00027     void pullUp(uint8_t p, bool pullup_anable);
00028     uint8_t digitalRead(uint8_t p);
00029 
00030     void writeGPIOAB(uint16_t);
00031     uint16_t readGPIOAB();
00032 
00033 private:
00034     I2C *_master;
00035     char *_buffer;
00036 };
00037 
00038 //#define MCP23017_ADDRESS 0x20
00039 #define MCP23017_ADDRESS 0x40
00040 
00041 #define INPUT 1
00042 #define OUTPUT 0
00043 
00044 // registers
00045 #define MCP23017_IODIRA 0x00
00046 #define MCP23017_IPOLA 0x02
00047 #define MCP23017_GPINTENA 0x04
00048 #define MCP23017_DEFVALA 0x06
00049 #define MCP23017_INTCONA 0x08
00050 #define MCP23017_IOCONA 0x0A
00051 #define MCP23017_GPPUA 0x0C
00052 #define MCP23017_INTFA 0x0E
00053 #define MCP23017_INTCAPA 0x10
00054 #define MCP23017_GPIOA 0x12
00055 #define MCP23017_OLATA 0x14
00056 
00057 
00058 #define MCP23017_IODIRB 0x01
00059 #define MCP23017_IPOLB 0x03
00060 #define MCP23017_GPINTENB 0x05
00061 #define MCP23017_DEFVALB 0x07
00062 #define MCP23017_INTCONB 0x09
00063 #define MCP23017_IOCONB 0x0B
00064 #define MCP23017_GPPUB 0x0D
00065 #define MCP23017_INTFB 0x0F
00066 #define MCP23017_INTCAPB 0x11
00067 #define MCP23017_GPIOB 0x13
00068 #define MCP23017_OLATB 0x15
00069 
00070 #endif
00071