dev_i2c_local.h

i2c总线接口驱动程序

/*===========================================================================
    Copyright 2000, 2001 Holley Communications. All rights reserved.
*/

/*****************************************************************************
 *
 * DEV_I2C_LOCAL.H - I2C Interface: Local Definitions
 *
 * PURPOSE:
 *    To define local definitions used within the I2C communication
 *    interface module.
 *    
 * HISTORY:
 *    V 1.00 - Mar 25, 1998 - G.Catt
 *             Creation
 *           - May 12, 1998 - G.Catt      
 *             Standardized symbol naming.
 *           - Jul 17, 2000 - Yanbing
 *             Performance improvements of I2C low level functions
 *
 * NOTE:
 *    
 *
 *****************************************************************************/

#ifndef DEV_I2C_LOCAL_H
#define DEV_I2C_LOCAL_H

#include "main_system.h"

/*--- I2C Signal States ---*/

/* Data States */
#define DEV_I2C_SIGNAL_HIGH      1                  /* High     (driven) */
#define DEV_I2C_SIGNAL_LOW       0                  /* Low      (driven) */

/* Control States */
#define DEV_I2C_SIGNAL_INACTIVE  DEV_I2C_SIGNAL_HIGH    /* Signal floating   */
#define DEV_I2C_SIGNAL_ASSERT    DEV_I2C_SIGNAL_LOW     /* Asserted (driven) */

/* Data Acknowledgements */
#define DEV_I2C_SIGNAL_NOACK     DEV_I2C_SIGNAL_INACTIVE/* No ACK (floating)   */
#define DEV_I2C_SIGNAL_ACK       DEV_I2C_SIGNAL_ASSERT  /* ACK    (driven low) */


/***********************************************************************
 *  Yanbing - The following defines are for I2C low level control.
 *  It is modified to improve I2C performances.
 ***********************************************************************/
#define MMI_I2C_SCL     13
#define MMI_I2C_SDA     14

#define DEV_PIO_SetDirection(dir, bit)  { if (dir) REG32(GPIO_BASE+GPIO_DIR) |= BIT(bit); \
                                          else REG32(GPIO_BASE+GPIO_DIR) &= ~BIT(bit); }

#define DEV_PIO_WRITE_PIO(val, bit)     { if (val) REG32(GPIO_BASE+GPIO_OUT) |= BIT(bit); \
                                          else REG32(GPIO_BASE+GPIO_OUT) &= ~BIT(bit); }

#define DEV_PIO_READ_PIO(bit)       (REG32(GPIO_BASE+GPIO_PIN) & BIT(bit))
#define SET_DIR_SCL(a)              DEV_PIO_SetDirection(a,MMI_I2C_SCL)
#define SET_DIR_SDA(a)              DEV_PIO_SetDirection(a,MMI_I2C_SDA)
#define WRITE_SCL(a)                DEV_PIO_WRITE_PIO(a,MMI_I2C_SCL)
#define WRITE_SDA(a)                DEV_PIO_WRITE_PIO(a,MMI_I2C_SDA)
#define READ_SCL()                  DEV_PIO_READ_PIO(MMI_I2C_SCL)
#define READ_SDA()                  DEV_PIO_READ_PIO(MMI_I2C_SDA)

#define READ_I2C_SLAVE_MUTE()       DEV_PIO_READ_PIO(UIM_SLAVE_I2C_MUTE)

#if BOARD_PHOENIX
# define dev_i2c_io_scllow()         { DEV_PIO_SetOutput(MMI_I2C_SCL); DEV_PIO_WRITE_LOW(MMI_I2C_SCL); }
# define dev_i2c_io_scltristate()    { DEV_PIO_SetInput(MMI_I2C_SCL); }
# define dev_i2c_io_sdalow()         { DEV_PIO_SetOutput(MMI_I2C_SDA); DEV_PIO_WRITE_LOW(MMI_I2C_SDA); }
# define dev_i2c_io_sdatristate()    { DEV_PIO_SetInput(MMI_I2C_SDA); }
#else
# define dev_i2c_io_scllow()         { SET_DIR_SCL(PIO_OUTPUT); WRITE_SCL(PIO_LOW); }
# define dev_i2c_io_scltristate()    { SET_DIR_SCL(PIO_INPUT); }
# define dev_i2c_io_sdalow()         { SET_DIR_SDA(PIO_OUTPUT); WRITE_SDA(PIO_LOW); }
# define dev_i2c_io_sdatristate()    { SET_DIR_SDA(PIO_INPUT); }
#endif
/* Local function prototypes */
void dev_i2c_io_initialize ( void );

Bool dev_i2c_io_sclstate ( void );
Bool dev_i2c_io_sdastate ( void );
#endif