115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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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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* 2017-11-14 勤为本 first version
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*/
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#include <rtthread.h>
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#include <drivers/dev_i2c.h>
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#include <drivers/dev_i2c_bit_ops.h>
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#include "drv_i2c.h"
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#include "../libraries/ls1c_gpio.h"
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#include "../libraries/ls1c_delay.h"
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#define LS1C_I2C_SCL (51) // gpio57
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#define LS1C_I2C_SDA (50) // gpio56
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#define LS1C_SET_GPIO_MODE
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static void ls1c_i2c_gpio_init(void)
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{
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gpio_init(LS1C_I2C_SCL, gpio_mode_output);
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gpio_set(LS1C_I2C_SCL, gpio_level_high);
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gpio_init(LS1C_I2C_SDA, gpio_mode_output);
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gpio_set(LS1C_I2C_SDA, gpio_level_high);
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return ;
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}
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static void ls1c_udelay(rt_uint32_t us)
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{
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delay_us((int)us);
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}
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static void ls1c_set_sda(void *data, rt_int32_t state)
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{
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#ifdef LS1C_SET_GPIO_MODE
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gpio_init(LS1C_I2C_SDA, gpio_mode_output);
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ls1c_udelay(5);
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#endif
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gpio_set(LS1C_I2C_SDA, state);
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return ;
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}
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static void ls1c_set_scl(void *data, rt_int32_t state)
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{
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#ifdef LS1C_SET_GPIO_MODE
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gpio_init(LS1C_I2C_SCL, gpio_mode_output);
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ls1c_udelay(5);
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#endif
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gpio_set(LS1C_I2C_SCL, state);
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return ;
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}
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static rt_int32_t ls1c_get_sda(void *data)
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{
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#ifdef LS1C_SET_GPIO_MODE
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gpio_init(LS1C_I2C_SDA, gpio_mode_input);
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ls1c_udelay(5);
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#endif
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return gpio_get(LS1C_I2C_SDA);
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}
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static rt_int32_t ls1c_get_scl(void *data)
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{
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#ifdef LS1C_SET_GPIO_MODE
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gpio_init(LS1C_I2C_SCL, gpio_mode_input);
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ls1c_udelay(5);
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#endif
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return gpio_get(LS1C_I2C_SCL);
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}
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static const struct rt_i2c_bit_ops bit_ops =
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{
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.data = RT_NULL,
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.pin_init = ls1c_i2c_gpio_init,
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.set_sda = ls1c_set_sda,
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.set_scl = ls1c_set_scl,
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.get_sda = ls1c_get_sda,
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.get_scl = ls1c_get_scl,
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.udelay = ls1c_udelay,
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.delay_us = 20, // 此值为周期(us)
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.timeout = 10, // 单位为tick
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.i2c_pin_init_flag = RT_FALSE
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};
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int ls1c_i2c_init(void)
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{
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static struct rt_i2c_bus_device bus = {0};
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bus.priv = (void *)&bit_ops;
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rt_i2c_bit_add_bus(&bus, "i2c3");
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return RT_EOK;
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}
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