71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
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* Copyright (c) 2006-2018, Synwit Technology Co.,Ltd.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018-05-31 ZYH first version
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* 2018-12-10 Zohar_Lee format file
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#include <board.h>
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static void drv_set_sda(void *data, rt_int32_t state)
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{
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rt_pin_mode(BSP_I2C_SDA, PIN_MODE_OUTPUT);
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rt_pin_write(BSP_I2C_SDA, state);
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}
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static void drv_set_scl(void *data, rt_int32_t state)
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{
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rt_pin_mode(BSP_I2C_SCL, PIN_MODE_OUTPUT);
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rt_pin_write(BSP_I2C_SCL, state);
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}
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static rt_int32_t drv_get_sda(void *data)
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{
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rt_pin_mode(BSP_I2C_SDA, PIN_MODE_INPUT_PULLUP);
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return rt_pin_read(BSP_I2C_SDA);
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}
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static rt_int32_t drv_get_scl(void *data)
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{
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rt_pin_mode(BSP_I2C_SCL, PIN_MODE_INPUT_PULLUP);
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return rt_pin_read(BSP_I2C_SCL);
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}
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static void drv_udelay(rt_uint32_t us)
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{
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int i = (SystemCoreClock / 4000000 * us);
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while (i)
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{
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i--;
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}
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}
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static const struct rt_i2c_bit_ops drv_bit_ops =
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{
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RT_NULL,
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drv_set_sda,
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drv_set_scl,
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drv_get_sda,
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drv_get_scl,
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drv_udelay,
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1,
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100
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};
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int rt_hw_i2c_init(void)
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{
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static struct rt_i2c_bus_device i2c2_bus;
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rt_memset((void *)&i2c2_bus, 0, sizeof(struct rt_i2c_bus_device));
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i2c2_bus.priv = (void *)&drv_bit_ops;
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rt_i2c_bit_add_bus(&i2c2_bus, BSP_I2C_BUS_NAME);
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return RT_EOK;
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}
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INIT_DEVICE_EXPORT(rt_hw_i2c_init);
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