mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-03 16:34:29 +00:00
aa363178d3
On some SoCs the frequency of the system clock is obtained at run time as the exact configuration of the hardware is not known at compile time. On such platforms using CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC define directly introduces timing errors. This commit replaces CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC by the call to inline function sys_clock_hw_cycles_per_sec() which always returns correct frequency of the system clock. Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
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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u32_t delays[2];
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};
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/**
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* @brief Initialize an i2c_bitbang instance
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*
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* @param bitbang The instance to initialize
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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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