i2c serial passthrough

groundboard/groundboard.ino

@@ -0,0 +1,87 @@
+byte MyAddress = 0x01;  //My i2c address
+byte Target = 0x00;  	// who i will be talking to
+//all the bytes ALL THE BYTES
+byte command[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; 
+int commandlength = 0; //how many bytes i actually use
+#include <Wire.h> // the part that makes i2c work without all that painful stuff
+
+void setup() //setup all the things that need to be done
+{
+	Wire.begin(MyAddress);        		//claim your place on the i2c bus
+	Wire.onReceive(receiveEvent); 		//someone sent me some stuff w00t
+	Serial.begin(115200); 				// spew this out as fast as I can
+}
+
+void loop()
+{
+	sendCommand;  	//send the stuff to i2c target
+	parseSerial; 	//get stuff from the computer
+}
+
+void receiveEvent(int howMany) //i2c recieve then spew to the serial port
+{
+	byte databiatch;				//be prepared to get incoming data
+	while(0 < Wire.available()) 	// loop through all the incoming data
+	{
+		databiatch = Wire.read(); 	// receive byte
+		Serial.print(databiatch); 	// print the byte
+	}
+	Serial.println();
+}
+
+void sendCommand(){
+	int sendstatus = 1; 	//status is not successfull yet
+	int fail=0;				//FAIL
+	if ( 0 != commandlength ) // if i have something
+	{
+		while ( 0 != sendstatus && 10 >= fail ) //try until it goes through or you fail to much
+		{
+			Wire.beginTransmission(Target); // transmit to target
+			for ( int data = 0; data < commandlength; data++)   //while still have data loop
+			{
+				Wire.write(command[data]);    //send it
+			}
+			sendstatus = Wire.endTransmission();    // stop transmitting
+			if ( 0 != sendstatus && fail < 10 ) 
+			{
+				fail++;								//haha fail
+				delay(random(0,100));				//wait for random
+			}
+		}
+		if ( 0 == sendstatus )	
+		{
+			Serial.println("ack");				//YAY you win
+		}
+		else
+		{
+			Serial.println("nack");				//haha fail
+		}
+
+	}
+	commandlength = 0;
+}
+
+void parseSerial(){
+	if (Serial.available() > 0)  				//if you have data start doing stuff
+	{			
+		if ( 0 == commandlength )				//if it is a new dataset get the header
+		{	
+			commandlength = Serial.read(); 	//message length number of bytes excluding this byte
+			Target = Serial.read(); 		//target device address
+			commandlength--;				// already took 1 thing
+		}
+		for ( int step=0; step = (commandlength-1); step++ )	//do until you have no stuff
+		{	
+			//make sure that you have as much data as you hoped
+			if (Serial.available() > 0 && step < commandlength )	
+			{
+				command[commandlength] = Serial.read();  			//read the serial until you have it
+			}
+			else
+			{
+				Serial.println("NACK");						//haha fail
+			}
+		}
+		Serial.println("ACK");							//YAY you win
+	}
+}