From 6ac0c51e72f857963d2121c247458e9af95ce295 Mon Sep 17 00:00:00 2001
From: Toby <tobscott@gmail.com>
Date: Sun, 30 Jun 2013 16:26:13 +0100
Subject: [PATCH] Added read ADC function

---
 arduino/arduino.py |   5 ++
 prototype.pde      | 122 +++++++++++++++++++++++++++++++++------------
 2 files changed, 94 insertions(+), 33 deletions(-)

diff --git a/arduino/arduino.py b/arduino/arduino.py
index 58f3890..51355e5 100644
--- a/arduino/arduino.py
+++ b/arduino/arduino.py
@@ -48,6 +48,11 @@ def analogRead(self, pin):
         self.__sendData(pin)
         return self.__getData()
 
+    def readADC(self,pin):
+        self.__sendData('5')
+        self.__sendData(pin)
+        return self.__getData()
+
     def turnOff(self):
         for each_pin in self.__OUTPUT_PINS:
             self.setLow(each_pin)
diff --git a/prototype.pde b/prototype.pde
index 524d5ae..f9819e4 100644
--- a/prototype.pde
+++ b/prototype.pde
@@ -7,45 +7,101 @@
 #define SERIAL_TIMEOUT      5
 #endif
 
+#define SELPIN 10 //Selection Pin 
+#define DATAOUT 11//MOSI 
+#define DATAIN  12//MISO 
+#define SPICLOCK  13//Clock 
+int readvalue; 
+
 void setup() {
-    Serial.begin(SERIAL_RATE);
-    Serial.setTimeout(SERIAL_TIMEOUT);
+	Serial.begin(SERIAL_RATE);
+	Serial.setTimeout(SERIAL_TIMEOUT);
+
+	int cmd = readData();
+	for (int i = 0; i < cmd; i++) {
+		pinMode(readData(), OUTPUT);
+	}
+	//set pin modes 
+	pinMode(SELPIN, OUTPUT); 
+	pinMode(DATAOUT, OUTPUT); 
+	pinMode(DATAIN, INPUT); 
+	pinMode(SPICLOCK, OUTPUT); 
+	//disable device to start with 
+	digitalWrite(SELPIN,HIGH); 
+	digitalWrite(DATAOUT,LOW); 
+	digitalWrite(SPICLOCK,LOW); 
 
-    int cmd = readData();
-    for (int i = 0; i < cmd; i++) {
-        pinMode(readData(), OUTPUT);
-    }
+	Serial.begin(9600); 
 }
 
 void loop() {
-    switch (readData()) {
-        case 0 :
-            //set digital low
-            digitalWrite(readData(), LOW); break;
-        case 1 :
-            //set digital high
-            digitalWrite(readData(), HIGH); break;
-        case 2 :
-            //get digital value
-            Serial.println(digitalRead(readData())); break;
-        case 3 :
-            // set analog value
-            analogWrite(readData(), readData()); break;
-        case 4 :
-            //read analog value
-            Serial.println(analogRead(readData())); break;
-        case 99:
-            //just dummy to cancel the current read, needed to prevent lock 
-            //when the PC side dropped the "w" that we sent
-            break;
-    }
+	switch (readData()) {
+		case 0 :
+			//set digital low
+			digitalWrite(readData(), LOW); break;
+		case 1 :
+			//set digital high
+			digitalWrite(readData(), HIGH); break;
+		case 2 :
+			//get digital value
+			Serial.println(digitalRead(readData())); break;
+		case 3 :
+			// set analog value
+			analogWrite(readData(), readData()); break;
+		case 4 :
+			//read analog value
+			Serial.println(analogRead(readData())); break;
+		case 5 :
+			//read MCP3208 value
+			Serial.println(readADC(readData())); break;
+
+
+
+		case 99:
+			//just dummy to cancel the current read, needed to prevent lock 
+			//when the PC side dropped the "w" that we sent
+			break;
+	}
 }
 
 char readData() {
-    Serial.println("w");
-    while(1) {
-        if(Serial.available() > 0) {
-            return Serial.parseInt();
-        }
-    }
+	Serial.println("w");
+	while(1) {
+		if(Serial.available() > 0) {
+			return Serial.parseInt();
+		}
+	}
+}
+
+int readADC(int channel) {
+	int adcvalue = 0;
+	byte commandbits = B11000000; //command bits - start, mode, chn (3), dont care (3)
+
+	//allow channel selection
+	commandbits|=((channel-1)<<3);
+
+	digitalWrite(SELPIN,LOW); //Select adc
+	// setup bits to be written
+	for (int i=7; i>=3; i--){
+		digitalWrite(DATAOUT,commandbits&1<<i);
+		//cycle clock
+		digitalWrite(SPICLOCK,HIGH);
+		digitalWrite(SPICLOCK,LOW);    
+	}
+
+	digitalWrite(SPICLOCK,HIGH);    //ignores 2 null bits
+	digitalWrite(SPICLOCK,LOW);
+	digitalWrite(SPICLOCK,HIGH);  
+	digitalWrite(SPICLOCK,LOW);
+
+	//read bits from adc
+	for (int i=11; i>=0; i--){
+		adcvalue+=digitalRead(DATAIN)<<i;
+		//cycle clock
+		digitalWrite(SPICLOCK,HIGH);
+		digitalWrite(SPICLOCK,LOW);
+	}
+	digitalWrite(SELPIN, HIGH); //turn off device
+	return adcvalue;
+
 }