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Add eZ80 I2C driver

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1679 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2009-04-04 20:27:37 +00:00
parent b1b2689519
commit affc606a1d
4 changed files with 990 additions and 8 deletions
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include/nuttx/i2c.h
+24 -5
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@@ -47,10 +47,28 @@
* Definitions
****************************************************************************/
/* I2C address calculation. Convert 7-bit address to 8-bit read/write address */
/* I2C address calculation. Convert 7- and 10-bit address to 8-bit and
* 16-bit read/write address
*/
#define I2C_READADDR(a) (((a) << 1) | 1)
#define I2C_WRITEADDR(a) ((a) << 1)
#define I2C_READBIT 0x01
/* Conver 7- to 8-bit address */
#define I2C_ADDR8(a) ((a) << 1)
#define I2C_WRITEADDR8(a) I2C_ADDR8(a)
#define I2C_READADDR8(a) (I2C_ADDR8(a) | I2C_READBIT)
/* Convert 10- to 16-bit address */
#define I2C_ADDR10H(a) (0xf0 | (((a) >> 7) & 0x06))
#define I2C_ADDR10L(a) ((a) & 0xff)
#define I2C_WRITEADDR10H(a) I2C_ADDR10H(a)
#define I2C_WRITEADDR10L(a) I2C_ADDR10L(a)
#define I2C_READADDR10H(a) (I2C_ADDR10H(a) | I2C_READBIT)
#define I2C_READADDR10L(a) I2C_ADDR10L(a)
/* Access macros */
@@ -82,13 +100,14 @@
* Input Parameters:
* dev - Device-specific state data
* address - The I2C slave address
* nbits - The number of address bits provided (7 or 10)
*
* Returned Value:
* Returns the actual frequency selected
*
****************************************************************************/
#define I2C_SETADDRESS(d,f) ((d)->ops->setaddress(d,f))
#define I2C_SETADDRESS(d,f,b) ((d)->ops->setaddress(d,f,b))
/****************************************************************************
* Name: I2C_WRITE
@@ -142,7 +161,7 @@ struct i2c_dev_s;
struct i2c_ops_s
{
uint32 (*setfrequency)(FAR struct i2c_dev_s *dev, uint32 frequency);
int (*setaddress)(FAR struct i2c_dev_s *dev, int addr);
int (*setaddress)(FAR struct i2c_dev_s *dev, int addr, int nbits);
int (*write)(FAR struct i2c_dev_s *dev, const ubyte *buffer, int buflen);
int (*read)(FAR struct i2c_dev_s *dev, ubyte *buffer, int buflen);
};