137 lines
2.7 KiB
C++
137 lines
2.7 KiB
C++
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/***************************************************
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This is a library for the MCP23008 i2c port expander
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****************************************************/
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#include "MCP23008.h"
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#include <Wire.h>
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void MCP23008::begin(uint8_t address) {
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_i2cAddress = address;
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Wire.begin();
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// set defaults!
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Wire.beginTransmission(_i2cAddress);
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Wire.write((byte)MCP23008_IODIR);
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Wire.write((byte)0xFF); // all inputs
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Wire.write((byte)0x00);
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Wire.write((byte)0x00);
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Wire.write((byte)0x00);
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Wire.write((byte)0x06);
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Wire.write((byte)0x00);
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Wire.write((byte)0x00);
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Wire.write((byte)0x00);
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Wire.write((byte)0x00);
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Wire.write((byte)0x00);
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Wire.endTransmission();
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}
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void MCP23008::pinMode(uint8_t mode) {
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// write the new IODIR
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_write(MCP23008_IODIR, mode);
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}
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void MCP23008::pinMode(uint8_t pin, uint8_t mode) {
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uint8_t iodir = _read(MCP23008_IODIR);
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if (mode == OUTPUT)
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bitWrite(iodir, pin, 0);
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else{
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bitWrite(iodir, pin, 1);
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uint8_t pullup = _read(MCP23008_GPPU);
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if (mode == INPUT_PULLUP)
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bitWrite(pullup, pin, 1);
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else
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bitWrite(pullup, pin, 0);
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_write(MCP23008_GPPU, pullup);
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}
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// write the new IODIR
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_write(MCP23008_IODIR, iodir);
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}
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void MCP23008::setPullup(uint8_t pullup) {
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// write pullup values
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_write(MCP23008_GPPU, pullup);
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}
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uint8_t MCP23008::read(){
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return _read(MCP23008_GPIO);
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}
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uint8_t MCP23008::read(uint8_t pin){
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uint8_t gpio = _read(MCP23008_GPIO);
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return bitRead(gpio, pin);
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}
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void MCP23008::write(uint8_t values){
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_write(MCP23008_GPIO, values);
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}
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void MCP23008::write(uint8_t pin, uint8_t value){
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uint8_t gpio = _read(MCP23008_GPIO);
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bitWrite(gpio, pin, value);
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_write(MCP23008_GPIO, gpio);
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}
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void MCP23008::enableInterrupt(uint8_t pin, uint8_t mode){
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uint8_t gpinten, defval, intcon;
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gpinten =_read(MCP23008_GPINTEN);
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defval = _read(MCP23008_DEFVAL);
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intcon = _read(MCP23008_INTCON);
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bitSet(gpinten, pin);
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switch (mode)
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{
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case CHANGE:
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bitClear(intcon, pin);
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break;
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case RISING:
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bitSet(intcon, pin);
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bitClear(defval, pin);
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break;
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case FALLING:
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bitSet(intcon, pin);
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bitSet(defval, pin);
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break;
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}
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_write(MCP23008_GPINTEN, gpinten);
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_write(MCP23008_DEFVAL, defval);
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_write(MCP23008_INTCON, intcon);
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}
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void MCP23008::disableInterrupt(uint8_t pin){
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uint8_t gpinten =_read(MCP23008_GPINTEN);
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bitClear(gpinten, pin);
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_write(MCP23008_GPINTEN, gpinten);
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}
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uint8_t MCP23008::_read(uint8_t address) {
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Wire.beginTransmission(MCP23008_ADDRESS | _i2cAddress);
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Wire.write((byte)address);
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Wire.endTransmission();
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Wire.requestFrom(MCP23008_ADDRESS | _i2cAddress, 1);
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return Wire.read();
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}
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void MCP23008::_write(uint8_t addr, uint8_t data) {
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Wire.beginTransmission(MCP23008_ADDRESS | _i2cAddress);
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Wire.write((byte)addr);
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Wire.write((byte)data);
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Wire.endTransmission();
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}
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