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libraries/Adafruit_LiquidCrystal/utility/Adafruit_MCP23008.cpp

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+/*************************************************** 
+  This is a library for the MCP23008 i2c port expander
+
+  These displays use I2C to communicate, 2 pins are required to  
+  interface
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#if ARDUINO >= 100
+ #include "Arduino.h"
+#else
+ #include "WProgram.h"
+#endif
+#include <Wire.h>
+#include "Adafruit_MCP23008.h"
+
+
+////////////////////////////////////////////////////////////////////////////////
+// RTC_DS1307 implementation
+
+void Adafruit_MCP23008::begin(uint8_t addr) {
+  addr &= 7;
+
+  i2caddr = addr;
+
+  Wire.begin();
+
+  // set defaults!
+  Wire.beginTransmission(MCP23008_ADDRESS | i2caddr);
+#if ARDUINO >= 100
+  Wire.write((byte)MCP23008_IODIR);
+  Wire.write((byte)0xFF);  // all inputs
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);
+  Wire.write((byte)0x00);	
+#else
+  Wire.send(MCP23008_IODIR);
+  Wire.send(0xFF);  // all inputs
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);
+  Wire.send(0x00);	
+#endif
+  Wire.endTransmission();
+
+}
+
+void Adafruit_MCP23008::begin(void) {
+  begin(0);
+}
+
+void Adafruit_MCP23008::pinMode(uint8_t p, uint8_t d) {
+  uint8_t iodir;
+  
+
+  // only 8 bits!
+  if (p > 7)
+    return;
+  
+  iodir = read8(MCP23008_IODIR);
+
+  // set the pin and direction
+  if (d == INPUT) {
+    iodir |= 1 << p; 
+  } else {
+    iodir &= ~(1 << p);
+  }
+
+  // write the new IODIR
+  write8(MCP23008_IODIR, iodir);
+}
+
+uint8_t Adafruit_MCP23008::readGPIO(void) {
+  // read the current GPIO input
+  return read8(MCP23008_GPIO);
+}
+
+void Adafruit_MCP23008::writeGPIO(uint8_t gpio) {
+  write8(MCP23008_GPIO, gpio);
+}
+
+
+void Adafruit_MCP23008::digitalWrite(uint8_t p, uint8_t d) {
+  uint8_t gpio;
+  
+  // only 8 bits!
+  if (p > 7)
+    return;
+
+  // read the current GPIO output latches
+  gpio = readGPIO();
+
+  // set the pin and direction
+  if (d == HIGH) {
+    gpio |= 1 << p; 
+  } else {
+    gpio &= ~(1 << p);
+  }
+
+  // write the new GPIO
+  writeGPIO(gpio);
+}
+
+void Adafruit_MCP23008::pullUp(uint8_t p, uint8_t d) {
+  uint8_t gppu;
+  
+  // only 8 bits!
+  if (p > 7)
+    return;
+
+  gppu = read8(MCP23008_GPPU);
+  // set the pin and direction
+  if (d == HIGH) {
+    gppu |= 1 << p; 
+  } else {
+    gppu &= ~(1 << p);
+  }
+  // write the new GPIO
+  write8(MCP23008_GPPU, gppu);
+}
+
+uint8_t Adafruit_MCP23008::digitalRead(uint8_t p) {
+  // only 8 bits!
+  if (p > 7)
+    return 0;
+
+  // read the current GPIO
+  return (readGPIO() >> p) & 0x1;
+}
+
+uint8_t Adafruit_MCP23008::read8(uint8_t addr) {
+  Wire.beginTransmission(MCP23008_ADDRESS | i2caddr);
+#if ARDUINO >= 100
+  Wire.write((byte)addr);	
+#else
+  Wire.send(addr);	
+#endif
+  Wire.endTransmission();
+  Wire.requestFrom(MCP23008_ADDRESS | i2caddr, 1);
+
+#if ARDUINO >= 100
+  return Wire.read();
+#else
+  return Wire.receive();
+#endif
+}
+
+
+void Adafruit_MCP23008::write8(uint8_t addr, uint8_t data) {
+  Wire.beginTransmission(MCP23008_ADDRESS | i2caddr);
+#if ARDUINO >= 100
+  Wire.write((byte)addr);
+  Wire.write((byte)data);
+#else
+  Wire.send(addr);	
+  Wire.send(data);
+#endif
+  Wire.endTransmission();
+}

libraries/Adafruit_LiquidCrystal/utility/Adafruit_MCP23008.h

@@ -0,0 +1,50 @@
+/*************************************************** 
+  This is a library for the MCP23008 i2c port expander
+
+  These displays use I2C to communicate, 2 pins are required to  
+  interface
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#ifndef _ADAFRUIT_MCP23008_H
+#define _ADAFRUIT_MCP23008_H
+// Don't forget the Wire library
+class Adafruit_MCP23008 {
+public:
+  void begin(uint8_t addr);
+  void begin(void);
+
+  void pinMode(uint8_t p, uint8_t d);
+  void digitalWrite(uint8_t p, uint8_t d);
+  void pullUp(uint8_t p, uint8_t d);
+  uint8_t digitalRead(uint8_t p);
+  uint8_t readGPIO(void);
+  void writeGPIO(uint8_t);
+
+ private:
+  uint8_t i2caddr;
+  uint8_t read8(uint8_t addr);
+  void write8(uint8_t addr, uint8_t data);
+};
+
+#define MCP23008_ADDRESS 0x20
+
+// registers
+#define MCP23008_IODIR 0x00
+#define MCP23008_IPOL 0x01
+#define MCP23008_GPINTEN 0x02
+#define MCP23008_DEFVAL 0x03
+#define MCP23008_INTCON 0x04
+#define MCP23008_IOCON 0x05
+#define MCP23008_GPPU 0x06
+#define MCP23008_INTF 0x07
+#define MCP23008_INTCAP 0x08
+#define MCP23008_GPIO 0x09
+#define MCP23008_OLAT 0x0A
+
+#endif