added libraries and clean up

2013-02-14 02:59:15 +01:00
parent 52975c9dba
commit d94fed811b
16 changed files with 528 additions and 162 deletions
@@ -0,0 +1,99 @@
+#include <Wire.h>
+
+#define MCP23017_ADDRESS 0x20
+
+// registers (from https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/blob/master/Adafruit_MCP23017.h)
+#define MCP23017_IODIRA 0x00
+#define MCP23017_IPOLA 0x02
+#define MCP23017_GPINTENA 0x04
+#define MCP23017_DEFVALA 0x06
+#define MCP23017_INTCONA 0x08
+#define MCP23017_IOCONA 0x0A
+#define MCP23017_GPPUA 0x0C
+#define MCP23017_INTFA 0x0E
+#define MCP23017_INTCAPA 0x10
+#define MCP23017_GPIOA 0x12
+#define MCP23017_OLATA 0x14
+
+#define MCP23017_IODIRB 0x01
+#define MCP23017_IPOLB 0x03
+#define MCP23017_GPINTENB 0x05
+#define MCP23017_DEFVALB 0x07
+#define MCP23017_INTCONB 0x09
+#define MCP23017_IOCONB 0x0B
+#define MCP23017_GPPUB 0x0D
+#define MCP23017_INTFB 0x0F
+#define MCP23017_INTCAPB 0x11
+#define MCP23017_GPIOB 0x13
+#define MCP23017_OLATB 0x15
+
+int _addr = 0;
+int _value[16];
+
+void setup() {
+  Serial.begin(9600);
+	Wire.begin();
+	
+	// set defaults!
+	Wire.beginTransmission(MCP23017_ADDRESS | _addr);
+	Wire.write((byte)MCP23017_IODIRA);
+	Wire.write(0xFF);  // all inputs on port A
+	Wire.endTransmission();
+
+	Wire.beginTransmission(MCP23017_ADDRESS | _addr);
+	Wire.write(MCP23017_IODIRB);
+	Wire.write(0xFF);  // all inputs on port B
+	Wire.endTransmission();
+	
+	
+	Wire.beginTransmission(MCP23017_ADDRESS | _addr);
+	Wire.write(MCP23017_GPPUA); 
+	Wire.write(0xFF);	// all pullup resistors on port A
+	Wire.endTransmission();
+	
+	Wire.beginTransmission(MCP23017_ADDRESS | _addr);
+	Wire.write(MCP23017_GPPUB); 
+	Wire.write(0xFF);	// all pullup resistors on port B
+	Wire.endTransmission();
+}
+
+void loop() {
+   	uint8_t pin,bank;
+	int value;
+	//read bank A
+	Wire.beginTransmission(MCP23017_ADDRESS | _addr);
+	Wire.write(MCP23017_GPIOA);
+	Wire.endTransmission();
+    Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
+	bank = Wire.read();
+	for (pin=0; pin<8; pin++) {
+		value = (bank >> pin) & 0x1;
+		if (_value[pin] != value) {
+			_value[pin] = value;
+		printValue(_addr,pin,value);
+		}
+	}  	
+	//read bank B
+	Wire.beginTransmission(MCP23017_ADDRESS | _addr);
+	Wire.write(MCP23017_GPIOB);
+	Wire.endTransmission();
+    Wire.requestFrom(MCP23017_ADDRESS | _addr, 1);
+	bank = Wire.read();
+	for (pin=8; pin<16; pin++) {
+		value = (bank >> (pin-8)) & 0x1;
+		if (_value[pin] != value) {
+			_value[pin] = value;
+		printValue(_addr,pin,value);
+		}		
+	}
+}
+
+void printValue(int id, int pin, int value) {
+   Serial.print("id: ");
+   Serial.print(id);
+   Serial.print(" pin: ");
+   Serial.print(pin);
+   Serial.print(" value: ");
+   Serial.print(value);
+   Serial.println();
+}