130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
/*
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* File : drv_i2c.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2017-11-14 ÇÚΪ±¾ first version
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*/
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#include <rtthread.h>
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#include <drivers/i2c.h>
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#include <drivers/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 (57) // gpio57
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#define LS1C_I2C_SDA (56) // 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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.data = RT_NULL,
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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, // ´ËֵΪÖÜÆÚ(us)
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.timeout = 10, // µ¥Î»Îªtick
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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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ls1c_i2c_gpio_init();
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rt_i2c_bit_add_bus(&bus, "i2c2");
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return RT_EOK;
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}
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