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+/*
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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 - 2018, 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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+ * 2017-06-05 tanek first implementation.
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+ * 2018-03-08 ZYH Porting for stm32f4xx
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+ */
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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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+
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+#include "drv_i2c.h"
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+#include <board.h>
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+
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+/*user can change this*/
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+#define I2C_BUS_NAME "i2c2"
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+
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+/*user should change this to adapt specific board*/
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+#define I2C_SCL_PIN GPIO_PIN_6
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+#define I2C_SCL_PORT GPIOB
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+#define I2C_SCL_PORT_CLK_ENABLE __HAL_RCC_GPIOB_CLK_ENABLE
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+#define I2C_SDA_PIN GPIO_PIN_7
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+#define I2C_SDA_PORT GPIOB
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+#define I2C_SDA_PORT_CLK_ENABLE __HAL_RCC_GPIOB_CLK_ENABLE
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+
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+
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+static void drv_i2c_gpio_init()
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+{
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+ GPIO_InitTypeDef GPIO_Initure;
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+
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+ I2C_SCL_PORT_CLK_ENABLE();
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+ I2C_SDA_PORT_CLK_ENABLE();
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+
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+ GPIO_Initure.Pin = I2C_SCL_PIN;
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+ GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
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+ GPIO_Initure.Pull = GPIO_PULLUP;
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+ GPIO_Initure.Speed = GPIO_SPEED_HIGH;
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+ HAL_GPIO_Init(I2C_SCL_PORT, &GPIO_Initure);
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+
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+ GPIO_Initure.Pin = I2C_SDA_PIN;
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+ GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
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+ GPIO_Initure.Pull = GPIO_PULLUP;
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+ GPIO_Initure.Speed = GPIO_SPEED_HIGH;
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+ HAL_GPIO_Init(I2C_SDA_PORT, &GPIO_Initure);
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+
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+ HAL_GPIO_WritePin(I2C_SCL_PORT, I2C_SCL_PIN, GPIO_PIN_SET);
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+ HAL_GPIO_WritePin(I2C_SDA_PORT, I2C_SDA_PIN, GPIO_PIN_SET);
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+}
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+
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+static void drv_set_sda(void *data, rt_int32_t state)
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+{
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+ HAL_GPIO_WritePin(I2C_SDA_PORT, I2C_SDA_PIN, state ? GPIO_PIN_SET : GPIO_PIN_RESET);
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+}
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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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+ HAL_GPIO_WritePin(I2C_SCL_PORT, I2C_SCL_PIN, state ? GPIO_PIN_SET : GPIO_PIN_RESET);
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+}
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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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+ return HAL_GPIO_ReadPin(I2C_SDA_PORT, I2C_SDA_PIN) ? 1 : 0;
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+}
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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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+ return HAL_GPIO_ReadPin(I2C_SCL_PORT, I2C_SCL_PIN) ? 1 : 0;
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+}
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+
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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 = ( HAL_RCC_GetHCLKFreq() / 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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+
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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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+
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+int drv_i2c_init(void)
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+{
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+ static struct rt_i2c_bus_device i2c2_bus;
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+
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+ drv_i2c_gpio_init();
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+
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+ rt_memset((void *)&i2c2_bus, 0, sizeof(struct rt_i2c_bus_device));
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+
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+ i2c2_bus.priv = (void *)&drv_bit_ops;
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+
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+ rt_i2c_bit_add_bus(&i2c2_bus, I2C_BUS_NAME);
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+
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+ return RT_EOK;
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+}
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+INIT_DEVICE_EXPORT(drv_i2c_init);
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+/* end of i2c driver */
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