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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-05-26 12:45:54 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-05-26 12:45:54 +0000 |
commit | aa523fbad99cbf5ee95d28bb11b6955a19bf6347 (patch) | |
tree | 8b62ef8f4ea621fcbe6977e6092a55de445462bd /nuttx/include/nuttx/i2c.h | |
parent | a3c42414f1a88d9c15343488d2be574bfa143093 (diff) | |
download | nuttx-aa523fbad99cbf5ee95d28bb11b6955a19bf6347.tar.gz nuttx-aa523fbad99cbf5ee95d28bb11b6955a19bf6347.tar.bz2 nuttx-aa523fbad99cbf5ee95d28bb11b6955a19bf6347.zip |
Extend I2C interface definition
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2700 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/include/nuttx/i2c.h')
-rw-r--r-- | nuttx/include/nuttx/i2c.h | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/nuttx/include/nuttx/i2c.h b/nuttx/include/nuttx/i2c.h index 8ebf65aa1..471d25619 100644 --- a/nuttx/include/nuttx/i2c.h +++ b/nuttx/include/nuttx/i2c.h @@ -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 */ /**************************************************************************** @@ -153,18 +158,56 @@ #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 ****************************************************************************/ /* 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 |