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leJOS (pronounced like the Spanish word "lejos" for "far") is a tiny Java Virtual Machine. In 2013 it was ported to the LEGO EV3 brick.
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package lejos.remote.ev3;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import lejos.hardware.port.I2CPort;
public class RemoteRequestI2CPort extends RemoteRequestIOPort implements I2CPort {
private ObjectInputStream is;
private ObjectOutputStream os;
private int portNum;
public RemoteRequestI2CPort(ObjectInputStream is, ObjectOutputStream os) {
this.is = is;
this.os = os;
}
@Override
public boolean open(int typ, int portNum,
RemoteRequestPort remoteRequestPort) {
boolean res = super.open(typ,portNum,remoteRequestPort);
this.portNum = portNum;
EV3Request req = new EV3Request();
req.request = EV3Request.Request.OPEN_I2C_PORT;
req.intValue2 = typ;
sendRequest(req, true);
return res;
}
@Override
public void close() {
EV3Request req = new EV3Request();
req.request = EV3Request.Request.CLOSE_SENSOR_PORT;
sendRequest(req, false);
}
@Override
public void i2cTransaction(int deviceAddress, byte[] writeBuf,
int writeOffset, int writeLen, byte[] readBuf, int readOffset,
int readLen) {
EV3Request req = new EV3Request();
req.request = EV3Request.Request.I2C_TRANSACTION;
req.intValue2 = deviceAddress;
req.intValue3 = writeOffset;
req.intValue4 = writeLen;
req.intValue5 = readLen;
req.byteData = writeBuf;
EV3Reply reply = sendRequest(req, true);
for(int i=0;i