/projects/cubeos/src_current/hardware/pcf8584.h Source File

00001 /*  src_experimental/hardware/pcf8584.h
00002     CubeOS Version 0.4.90 experimental
00003     Copyright (C) 1999,2000 Holger Kenn
00004 
00005     CubeOS is free software; you can redistribute it and/or
00006     modify it under the terms of the GNU Library General Public
00007     License as published by the Free Software Foundation; either
00008     version 2 of the License, or any later version.
00009 
00010     CubeOS is distributed in the hope that it will be useful,
00011     but WITHOUT ANY WARRANTY; without even the implied warranty of
00012     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013     Library General Public License for more details.
00014 
00015 */  
00016 /* Writable Flags in Control register */
00017 
00018 #define ACK     0x01    /* Acknowledge cycle */
00019 #define STO     0x02    /* Stop condition */
00020 #define STA     0x04    /* Start condition */
00021 #define ENI     0x08    /* Enable interrupt */
00022 #define ESO     0x40    /* Enable i2c bus interface */
00023 
00024 /* Readable Flags in Control Register */
00025 
00026 #define BB      0x01    /* i2c bus busy */
00027 #define LAB     0x02    /* lost arbitration */
00028 #define AAS     0x04    /* Addressed as slave */
00029 #define LRB     0x08    /* last received bit */
00030 #define BER     0x10    /* bus error */
00031 #define STS     0x20    /* stop condition detected */
00032 #define PIN     0x80    /* pending interrupt (active low) */
00033 
00034 struct i2c_device {
00035   unsigned char data;
00036   unsigned char control;
00037 };