00001 /* src_experimental/drivers/i2c/i2cd.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 00017 #ifndef _I2CD_H 00018 #define _I2CD_H 00019 00024 #include <ssem.h> /* for semaphores */ 00025 00026 #define I2C_MASTER 0 00027 #define I2C_SLAVE 1 00028 00029 #define I2CA 0x41 00030 #define I2CB 0x42 00031 00032 #define I2C_TIMEOUT_VAL 1000 00033 #define I2CA_SLAVE_ADDR 0x55 00034 #define I2CB_SLAVE_ADDR 0x56 00035 #define I2C_SPEED 0x1c 00036 00037 #define I2C_MASTER_MODE 0 00038 #define I2C_SLAVE_MODE 1 00039 00040 /* States in Master Mode */ 00041 00042 #define MASTER_IDLE 0 00043 #define MASTER_SEND 1 00044 #define MASTER_WAIT_ACK 2 00045 #define MASTER_RECV 3 00046 #define MASTER_RECV_LAST 4 00047 00048 /* States in Slave Mode */ 00049 00050 #define SLAVE_IDLE 0 00051 #define SLAVE_SEND 1 00052 #define SLAVE_RECV 2 00053 00054 00055 #define MBUFLEN 10 /* num. mess. in master queue */ 00056 #define SBUFLEN 10 /* num. char in slave buffer */ 00057 00058 /* Mnemonics for the return messages of the driver */ 00059 00060 #define I2C_NOT_PROCESSED 0 /* so far unprocessed messages */ 00061 #define I2C_OK 1 /* transfer ended No Errors */ 00062 #define I2C_BUSY 2 /* transfer busy */ 00063 #define I2C_ERR 3 /* err: general error */ 00064 #define I2C_NACK_ON_DATA 4 /* err: No ack on data */ 00065 #define I2C_NACK_ON_ADDRESS 5 /* err: No ack on address */ 00066 #define I2C_ARBITRATION_LOST 6 /* err: Arbitration lost */ 00067 #define I2C_TIME_OUT 7 /* err: Time out occurred */ 00068 #define I2C_NO_BUS 8 /* err: No such i2c bus */ 00069 00070 /* Flags for execeptions in slave handler */ 00071 00072 #define I2C_SLAVE_OBUF_EMPTY 1 00073 #define I2C_SLAVE_IBUF_OVERFLOW 2 00074 #define I2C_SLAVE_ERR 4 00075 00080 struct i2cmess { 00081 unsigned char address; 00082 unsigned char nrBytes; 00083 unsigned char procBytes; 00084 unsigned char *buf; 00085 unsigned char status; 00086 }; 00087 00088 00093 struct i2c { 00094 struct i2c_device *ioaddr; 00095 int mode; 00096 int m_head; 00097 int m_tail; 00098 struct i2cmess* m_buff[MBUFLEN]; 00099 ssem_t m_sem; 00100 int m_cnt; 00101 int m_dcnt; 00102 void (*m_state_handler)(struct i2c *ptr); 00103 int m_state; 00104 int s_iptr; 00105 int s_icnt; 00106 ssem_t s_isem; 00107 char s_ibuff[SBUFLEN]; 00108 int s_optr; 00109 int s_ocnt; 00110 ssem_t s_osem; 00111 char s_obuff[SBUFLEN]; 00112 void (*s_state_handler)(struct i2c *ptr); 00113 int s_state; 00114 char s_status; 00115 }; 00116 00117 /* Interface functions */ 00118 00119 void I2C_inthandler(unsigned long minor); 00120 void _I2C_master_handler(struct i2c *p); 00121 void _I2C_slave_handler(struct i2c *p); 00122 int I2C_init(int which, unsigned long ioaddr); 00123 int I2C_process(unsigned char whichBus, unsigned char whichQueue, struct i2cmess *msg); 00124 int I2C_messagestatus(struct i2cmess * msg); 00125 int I2C_scanbus(unsigned char whichBus); 00126 extern struct i2c i2c[]; 00127 00128 /* externally defined assembler functions */ 00129 00130 void I2C_int_a(void); 00131 void I2C_int_b(void); 00132 #endif
1.2.14 written by Dimitri van Heesch,
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