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99 lines
2.4 KiB
99 lines
2.4 KiB
#include <Wire.h>
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#define MCP23017_ADDRESS 0x20
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// registers (from https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/blob/master/Adafruit_MCP23017.h)
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#define MCP23017_IODIRA 0x00
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#define MCP23017_IPOLA 0x02
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#define MCP23017_GPINTENA 0x04
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#define MCP23017_DEFVALA 0x06
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#define MCP23017_INTCONA 0x08
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#define MCP23017_IOCONA 0x0A
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#define MCP23017_GPPUA 0x0C
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#define MCP23017_INTFA 0x0E
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#define MCP23017_INTCAPA 0x10
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#define MCP23017_GPIOA 0x12
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#define MCP23017_OLATA 0x14
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#define MCP23017_IODIRB 0x01
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#define MCP23017_IPOLB 0x03
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#define MCP23017_GPINTENB 0x05
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#define MCP23017_DEFVALB 0x07
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#define MCP23017_INTCONB 0x09
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#define MCP23017_IOCONB 0x0B
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#define MCP23017_GPPUB 0x0D
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#define MCP23017_INTFB 0x0F
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#define MCP23017_INTCAPB 0x11
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#define MCP23017_GPIOB 0x13
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#define MCP23017_OLATB 0x15
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int _addr = 0;
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int _value[16];
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void setup() {
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Serial.begin(9600);
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Wire.begin();
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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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}
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void 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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printValue(_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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printValue(_addr,pin,value);
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}
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}
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}
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void printValue(int id, int pin, int value) {
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Serial.print("id: ");
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Serial.print(id);
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Serial.print(" pin: ");
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Serial.print(pin);
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Serial.print(" value: ");
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Serial.print(value);
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Serial.println();
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}
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