// (c) 2008 Thomas Oltzen //
// This program is free software; you can redistribute it and/or //
// modify it under the terms of the GNU General Public License //
// as published by the Free Software Foundation; either version2 of //
// the License, or (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU //
// General Public License for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program (see COPYING); if not, write to the //
// Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. //
package i2c;
import java.io.IOException;
import de.wenzlaff.twusb.schnittstelle.TWUsb;
import de.wenzlaff.twusb.schnittstelle.exception.TWUsbException;
public class K8055_I2C {
int device = 3;
private boolean openflag;
final static int SDA_PIN = 1;
final static int SCL_PIN = 2;
public K8055_I2C(int device_no) {
device = device_no;
}
/** Set the data line. */
private void SDA(boolean bool) throws TWUsbException
{
// Wenn der Ausgang auf Off gesetzt wird, setzt der Pull-up Widerstand auf 5V!
// Ist der Ausgang auf On, so wird die Leitung auf GND gelegt.
if (bool)
TWUsb.ClearDigitalChannel(SDA_PIN);
else
TWUsb.SetDigitalChannel(SDA_PIN);
}
/** Set the clock line. */
private void SCL(boolean bool) throws TWUsbException
{
// Wenn der Ausgang auf Off gesetzt wird, setzt der Pull-up Widerstand auf 5V!
// Ist der Ausgang auf On, so wird die Leitung auf GND gelegt.
if (bool)
TWUsb.ClearDigitalChannel(SCL_PIN);
else
TWUsb.SetDigitalChannel(SCL_PIN);
}
/** Send a bit on I2C */
public void sendBit(boolean bool) throws TWUsbException
{
if (bool) {
SDA(true);
}
SCL(true);
SCL(false);
SDA(false);
}
/** Send the start condition. */
public void sendStart() throws TWUsbException
{
SCL(true);
SDA(true);
SDA(false);
SCL(false);
}
/** Send the stop condition. */
public void sendStop() throws TWUsbException
{
SDA(false);
SCL(true);
SDA(true);
}
/** Receive a bit from slave. */
public boolean receiveBit() throws TWUsbException
{
SDA(true);
SCL(true);
// Leider muss hier ca. 300ms gewartet werden bis der K8055 die Eingangsleitung erkennt.
delay();
boolean ret = TWUsb.ReadDigitalChannel(SDA_PIN);
SCL(false);
return ret;
}
/** Read a acknowledge from slave. */
public void readAck() throws Exception
{
if (!receiveBit())
throw new Exception("No I2C ACK from Slave.");
}
/** Send a byte to Slave
*
* @param by
* @throws Exception
*/
public void sendDataByte(int by) throws Exception
{
for (int k = 7; k >= 0; k--)
sendBit((by & (1 << k)) > 0);
}
/** Send a Adress to Slave
*
* @param addr
* @throws Exception
*/
public void sendAddress(int addr) throws Exception
{
System.out.println("sendAddress " + addr);
for (int k = 6; k >= 0; k--)
sendBit((addr & (1 << k)) > 0);
}
/** Read a byte from I2C.
*
* @return
* @throws Exception
*/
public int recDataByte() throws Exception
{
int k, val = 0;
for (k = 7; k >= 0; k--)
if (receiveBit())
val |= 1 << k;
System.out.println("read=" + val);
return val;
}
/** Close the connection to k8055 */
public void closeConnection()
{
TWUsb.CloseDevice();
openflag = false;
}
/** Is the connection to K8055 establish. */
public boolean isOpen()
{
return openflag;
}
/** Open the connection to k8055 */
public void openConnection() throws TWUsbException
{
System.out.println("openConnection:" + TWUsb.OpenDevice(3));
sendStop();
openflag = true;
}
/** Send the write bit to I2C. */
public void sendWriteFlag() throws TWUsbException
{
System.out.println("Send Write Flag");
sendBit(false);
}
/** Send the read bit to I2C. */
public void sendReadFlag() throws TWUsbException
{
System.out.println("Send Read Flag");
sendBit(true);
}
/** Wait 300ms. */
private void delay()
{
try {
Thread.sleep(300);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/** Send the acknowledge bit to I2C. */
public void sendAck(boolean b) throws TWUsbException
{
sendBit(!b);
}
}
HobbyCi