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