58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2017 Linaro Ltd.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
/**
|
|
* @brief Functions for setting and getting the state of the I2C lines.
|
|
*
|
|
* These need to be implemented by the user of this library.
|
|
*/
|
|
struct i2c_bitbang_io {
|
|
/* Set the state of the SCL line (zero/non-zero value) */
|
|
void (*set_scl)(void *io_context, int state);
|
|
/* Set the state of the SDA line (zero/non-zero value) */
|
|
void (*set_sda)(void *io_context, int state);
|
|
/* Return the state of the SDA line (zero/non-zero value) */
|
|
int (*get_sda)(void *io_context);
|
|
};
|
|
|
|
/**
|
|
* @brief Instance data for i2c_bitbang
|
|
*
|
|
* A driver or other code wishing to use the i2c_bitbang library should
|
|
* create one of these structures then use it via the library APIs.
|
|
* Structure members are private, and shouldn't be accessed directly.
|
|
*/
|
|
struct i2c_bitbang {
|
|
const struct i2c_bitbang_io *io;
|
|
void *io_context;
|
|
u32_t delays[2];
|
|
};
|
|
|
|
/**
|
|
* @brief Initialize an i2c_bitbang instance
|
|
*
|
|
* @param bitbang The instance to initialize
|
|
* @param io Functions to use for controlling I2C bus lines
|
|
* @param io_context Context pointer to pass to i/o functions when then are
|
|
* called.
|
|
*/
|
|
void i2c_bitbang_init(struct i2c_bitbang *bitbang,
|
|
const struct i2c_bitbang_io *io, void *io_context);
|
|
|
|
/**
|
|
* Implementation of the functionality required by the 'configure' function
|
|
* in struct i2c_driver_api.
|
|
*/
|
|
int i2c_bitbang_configure(struct i2c_bitbang *bitbang, u32_t dev_config);
|
|
|
|
/**
|
|
* Implementation of the functionality required by the 'transfer' function
|
|
* in struct i2c_driver_api.
|
|
*/
|
|
int i2c_bitbang_transfer(struct i2c_bitbang *bitbang,
|
|
struct i2c_msg *msgs, u8_t num_msgs,
|
|
u16_t slave_address);
|