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package com.diozero.api;
/*-
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: I2CDeviceInterface.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
/**
* Inter-Integrated Circuit (I2C) Interface
*/
public interface I2CDeviceInterface extends DeviceInterface, I2CSMBusInterface {
//
default int readNoStop(byte registerAddress, int rxLength, byte[] rxData, boolean repeatedStart) {
throw new UnsupportedOperationException("I2C readNoStop not supported");
}
default void readWrite(I2CMessage[] messages, byte[] buffer) {
throw new UnsupportedOperationException("I2C readWrite not supported");
}
public static class I2CMessage {
// https://www.kernel.org/doc/Documentation/i2c/i2c-protocol
// Write data, from master to slave
public static final int I2C_M_WR = 0;
// Read data, from slave to master
public static final int I2C_M_RD = 0x0001;
// In a read message, master A/NA bit is skipped.
public static final int I2C_M_NO_RD_ACK = 0x0800;
/*- Normally message is interrupted immediately if there is [NA] from the
* client. Setting this flag treats any [NA] as [A], and all of
* message is sent. */
public static final int I2C_M_IGNORE_NAK = 0x1000;
/*- In a combined transaction, no 'S Addr Wr/Rd [A]' is generated at some
* point. For example, setting I2C_M_NOSTART on the second partial message
* generates something like:
* S Addr Rd [A] [Data] NA Data [A] P
* rather than:
* S Addr Rd [A] [Data] NA S Addr Wr [A] Data [A] P
*/
public static final int I2C_M_NOSTART = 0x4000;
public int flags;
public int len;
public I2CMessage(int flags, int len) {
this.flags = flags;
this.len = len;
}
}
}
