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Extend I2C interface definition 

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2700 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-05-26 12:45:54 +00:00
parent 658ef2bd59
commit a74feef081
1 changed files with 44 additions and 1 deletions
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45
include/nuttx/i2c.h
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@ -1,7 +1,7 @@
/****************************************************************************
* include/nuttx/i2c.h
*
* Copyright(C) 2009 Gregory Nutt. All rights reserved.
* Copyright(C) 2009-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@ -71,6 +71,11 @@
#define I2C_READADDR10H(a) (I2C_ADDR10H(a) | I2C_READBIT)
#define I2C_READADDR10L(a) I2C_ADDR10L(a)
/* Bit definitions for the flags field in struct i2c_ops_s */
#define I2C_M_READ 0x0001 /* read data, from slave to master */
#define I2C_M_TEN 0x0002 /* ten bit address */
/* Access macros */
/****************************************************************************
@ -152,6 +157,27 @@
#define I2C_READ(d,b,l) ((d)->ops->read(d,b,l))
/****************************************************************************
* Name: I2C_TRANSFER
*
* Description:
* Perform a sequence of I2C transfers, each transfer is started with a
* START and the final transfer is completed with a STOP. Each sequence
* will be an 'atomic' operation in the sense that any other I2C actions
* will be serialized and pend until this read completes. Optional.
*
* Input Parameters:
* dev - Device-specific state data
* msgs - A pointer to a set of message descriptors
* msgcount - The number of transfers to perform
*
* Returned Value:
* The number of transfers completed
*
****************************************************************************/
#define I2C_TRANSFER(d,m,c) ((d)->ops->transfer(d,m,c))
/****************************************************************************
* Public Types
****************************************************************************/
@ -159,12 +185,29 @@
/* The I2C vtable */
struct i2c_dev_s;
struct i2c_msg_s;
struct i2c_ops_s
{
uint32_t (*setfrequency)(FAR struct i2c_dev_s *dev, uint32_t frequency);
int (*setaddress)(FAR struct i2c_dev_s *dev, int addr, int nbits);
int (*write)(FAR struct i2c_dev_s *dev, const uint8_t *buffer, int buflen);
int (*read)(FAR struct i2c_dev_s *dev, uint8_t *buffer, int buflen);
#ifdef CONFIG_I2C_TRANSFER
int (*transfer)(FAR struct i2c_dev_s *dev, FAR struct i2c_msg_s *msgs, int count);
#endif
};
/* I2C transaction segment beginning with a START. A number of these can
* be transfered together to form an arbitrary sequence of write/read transfer
* to an I2C slave device.
*/
struct i2c_msg_s
{
uint16_t addr; /* Slave address */
uint16_t flags; /* See I2C_M_* definitions */
uint8_t *buffer;
int length;
};
/* I2C private data. This structure only defines the initial fields of the