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Add I2C_TRANSFER based wrappers for I2C_TRANSFER as well

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This commit is contained in:
Gregory Nutt
2016-01-26 10:57:51 -06:00
parent d4a53ee131
commit b6b3c2be3e
5 changed files with 276 additions and 8 deletions
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include/nuttx/i2c.h
+66 -5
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@@ -228,9 +228,10 @@ 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 (*write)(FAR struct i2c_dev_s *dev, FAR const uint8_t *buffer,
int buflen);
int (*read)(FAR struct i2c_dev_s *dev, FAR 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);
@@ -338,13 +339,25 @@ int up_i2cuninitialize(FAR struct i2c_dev_s *dev);
int up_i2creset(FAR struct i2c_dev_s *dev);
#endif
/************************************************************************************
/****************************************************************************
* Name: i2c_writeread
*
* Description:
* Write to then read from the I2C device.
* Send a block of data on I2C using the previously, followed by restarted
* read access. This provides a convenient wrapper to the transfer function.
*
************************************************************************************/
* Input Parameters:
* dev - Device-specific state data
* config - Described the I2C configuration
* wbuffer - A pointer to the read-only buffer of data to be written to device
* wbuflen - The number of bytes to send from the buffer
* rbuffer - A pointer to a buffer of data to receive the data from the device
* rbuflen - The requested number of bytes to be read
*
* Returned Value:
* 0: success, <0: A negated errno
*
****************************************************************************/
#ifdef CONFIG_I2C_TRANSFER
int i2c_writeread(FAR struct i2c_dev_s *dev, FAR const struct i2c_config_s *config,
@@ -352,6 +365,54 @@ int i2c_writeread(FAR struct i2c_dev_s *dev, FAR const struct i2c_config_s *conf
FAR uint8_t *rbuffer, int rbuflen);
#endif
/****************************************************************************
* Name: i2c_write
*
* Description:
* Send a block of data on I2C. Each write operational will be an 'atomic'
* operation in the sense that any other I2C actions will be serialized
* and pend until this write completes.
*
* Input Parameters:
* dev - Device-specific state data
* config - Described the I2C configuration
* buffer - A pointer to the read-only buffer of data to be written to device
* buflen - The number of bytes to send from the buffer
*
* Returned Value:
* 0: success, <0: A negated errno
*
****************************************************************************/
#ifdef CONFIG_I2C_TRANSFER
int i2c_write(FAR struct i2c_dev_s *dev, FAR const struct i2c_config_s *config,
FAR const uint8_t *buffer, int buflen);
#endif
/****************************************************************************
* Name: i2c_read
*
* Description:
* Receive a block of data from I2C using the previously selected I2C
* frequency and slave address. Each read operational will be an 'atomic'
* operation in the sense that any other I2C actions will be serialized
* and pend until this read completes. Required.
*
* Input Parameters:
* dev - Device-specific state data
* buffer - A pointer to a buffer of data to receive the data from the device
* buflen - The requested number of bytes to be read
*
* Returned Value:
* 0: success, <0: A negated errno
*
****************************************************************************/
#ifdef CONFIG_I2C_TRANSFER
int i2c_read(FAR struct i2c_dev_s *dev, FAR const struct i2c_config_s *config,
FAR uint8_t *buffer, int buflen);
#endif
#undef EXTERN
#if defined(__cplusplus)
}