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/*
* File : drv_i2c.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2017-11-14 ���� first version
*/
#include <rtthread.h>
#include <drivers/i2c.h>
#include <drivers/i2c-bit-ops.h>
#include "drv_i2c.h"
#include "../libraries/ls1c_gpio.h"
#include "../libraries/ls1c_delay.h"
#define LS1C_I2C_SCL (57) // gpio57
#define LS1C_I2C_SDA (56) // gpio56
#define LS1C_SET_GPIO_MODE
static void ls1c_i2c_gpio_init(void)
{
gpio_init(LS1C_I2C_SCL, gpio_mode_output);
gpio_set(LS1C_I2C_SCL, gpio_level_high);
gpio_init(LS1C_I2C_SDA, gpio_mode_output);
gpio_set(LS1C_I2C_SDA, gpio_level_high);
return ;
}
static void ls1c_udelay(rt_uint32_t us)
{
delay_us((int)us);
}
static void ls1c_set_sda(void *data, rt_int32_t state)
{
#ifdef LS1C_SET_GPIO_MODE
gpio_init(LS1C_I2C_SDA, gpio_mode_output);
ls1c_udelay(5);
#endif
gpio_set(LS1C_I2C_SDA, state);
return ;
}
static void ls1c_set_scl(void *data, rt_int32_t state)
{
#ifdef LS1C_SET_GPIO_MODE
gpio_init(LS1C_I2C_SCL, gpio_mode_output);
ls1c_udelay(5);
#endif
gpio_set(LS1C_I2C_SCL, state);
return ;
}
static rt_int32_t ls1c_get_sda(void *data)
{
#ifdef LS1C_SET_GPIO_MODE
gpio_init(LS1C_I2C_SDA, gpio_mode_input);
ls1c_udelay(5);
#endif
return gpio_get(LS1C_I2C_SDA);
}
static rt_int32_t ls1c_get_scl(void *data)
{
#ifdef LS1C_SET_GPIO_MODE
gpio_init(LS1C_I2C_SCL, gpio_mode_input);
ls1c_udelay(5);
#endif
return gpio_get(LS1C_I2C_SCL);
}
static const struct rt_i2c_bit_ops bit_ops = {
.data = RT_NULL,
.set_sda = ls1c_set_sda,
.set_scl = ls1c_set_scl,
.get_sda = ls1c_get_sda,
.get_scl = ls1c_get_scl,
.udelay = ls1c_udelay,
.delay_us = 20, // ��ֵΪ����(us)
.timeout = 10, // ��λΪtick
};
int ls1c_i2c_init(void)
{
static struct rt_i2c_bus_device bus = {0};
bus.priv = (void *)&bit_ops;
ls1c_i2c_gpio_init();
rt_i2c_bit_add_bus(&bus, "i2c2");
return RT_EOK;
}
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