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115 lines
2.8 KiB
115 lines
2.8 KiB
#include <Wire.h>
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#include "Arduino.h"
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#include "INPUT_MCP23017.h"
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void INPUT_MCP23017::begin(uint8_t addr,CallbackFunction cbF) {
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Wire.begin();
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if (addr > 7)
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_addr = 7;
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else _addr = addr;
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_callbackFunction = cbF;
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// set defaults!
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write((byte)MCP23017_IODIRA);
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Wire.write(0xFF); // all inputs on port A
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_IODIRB);
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Wire.write(0xFF); // all inputs on port B
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPPUA);
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Wire.write(0xFF); // all pullup resistors on port A
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPPUB);
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Wire.write(0xFF); // all pullup resistors on port B
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write((byte)MCP23017_IPOLA);
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Wire.write(0xFF); // inverse all inputs
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Wire.endTransmission();
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_IPOLB);
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Wire.write(0xFF); // inverse all inputs
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Wire.endTransmission();
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//init start values
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uint8_t pin,bank;
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//read bank A
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIOA);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=0; pin<8; pin++)
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_value[pin] = (bank >> pin) & 0x1;
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//read bank B
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIOB);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=8; pin<16; pin++)
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_value[pin] = (bank >> (pin-8)) & 0x1;
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}
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void INPUT_MCP23017::loop() {
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uint8_t pin,bank;
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int value;
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//read bank A
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIOA);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=0; pin<8; pin++) {
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value = (bank >> pin) & 0x1;
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if (_value[pin] != value) {
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_value[pin] = value;
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(*_callbackFunction)(_addr,pin,value);
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}
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}
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//read bank B
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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Wire.write(MCP23017_GPIOB);
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Wire.endTransmission();
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Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
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bank = Wire.read();
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for (pin=8; pin<16; pin++) {
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value = (bank >> (pin-8)) & 0x1;
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if (_value[pin] != value) {
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_value[pin] = value;
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(*_callbackFunction)(_addr,pin,value);
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}
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}
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}
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int INPUT_MCP23017::getSpecificValue(uint8_t pin) {
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if (pin > 16)
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return LOW;
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Wire.beginTransmission(MCP23017_ADDRESS | _addr);
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uint8_t p = pin;
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if (pin > 8) {
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Wire.write(MCP23017_GPIOB);
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p -= 8;
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} else
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Wire.write(MCP23017_GPIOA);
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Wire.endTransmission();
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uint8_t bank = Wire.read();
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int value = (bank >> p) & 0x1;
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_value[pin] = value;
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return value;
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}
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