111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
|
|
* File : drv_i2c.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2006 - 2018, 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
|
|
* 2017-06-05 tanek first implementation.
|
|
* 2018-03-08 ZYH Porting for stm32f4xx
|
|
*/
|
|
#include <rthw.h>
|
|
#include <rtthread.h>
|
|
#include <rtdevice.h>
|
|
#include "drv_i2c.h"
|
|
#include <board.h>
|
|
/*user can change this*/
|
|
#define I2C_BUS_NAME "i2c2"
|
|
/*user should change this to adapt specific board*/
|
|
#define I2C_SCL_PIN GPIO_PIN_6
|
|
#define I2C_SCL_PORT GPIOB
|
|
#define I2C_SCL_PORT_CLK_ENABLE __HAL_RCC_GPIOB_CLK_ENABLE
|
|
#define I2C_SDA_PIN GPIO_PIN_7
|
|
#define I2C_SDA_PORT GPIOB
|
|
#define I2C_SDA_PORT_CLK_ENABLE __HAL_RCC_GPIOB_CLK_ENABLE
|
|
|
|
static void drv_i2c_gpio_init()
|
|
{
|
|
GPIO_InitTypeDef GPIO_Initure;
|
|
I2C_SCL_PORT_CLK_ENABLE();
|
|
I2C_SDA_PORT_CLK_ENABLE();
|
|
GPIO_Initure.Pin = I2C_SCL_PIN;
|
|
GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
|
|
GPIO_Initure.Pull = GPIO_PULLUP;
|
|
GPIO_Initure.Speed = GPIO_SPEED_HIGH;
|
|
HAL_GPIO_Init(I2C_SCL_PORT, &GPIO_Initure);
|
|
GPIO_Initure.Pin = I2C_SDA_PIN;
|
|
GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
|
|
GPIO_Initure.Pull = GPIO_PULLUP;
|
|
GPIO_Initure.Speed = GPIO_SPEED_HIGH;
|
|
HAL_GPIO_Init(I2C_SDA_PORT, &GPIO_Initure);
|
|
HAL_GPIO_WritePin(I2C_SCL_PORT, I2C_SCL_PIN, GPIO_PIN_SET);
|
|
HAL_GPIO_WritePin(I2C_SDA_PORT, I2C_SDA_PIN, GPIO_PIN_SET);
|
|
}
|
|
|
|
static void drv_set_sda(void *data, rt_int32_t state)
|
|
{
|
|
HAL_GPIO_WritePin(I2C_SDA_PORT, I2C_SDA_PIN, state ? GPIO_PIN_SET : GPIO_PIN_RESET);
|
|
}
|
|
|
|
static void drv_set_scl(void *data, rt_int32_t state)
|
|
{
|
|
HAL_GPIO_WritePin(I2C_SCL_PORT, I2C_SCL_PIN, state ? GPIO_PIN_SET : GPIO_PIN_RESET);
|
|
}
|
|
|
|
static rt_int32_t drv_get_sda(void *data)
|
|
{
|
|
return HAL_GPIO_ReadPin(I2C_SDA_PORT, I2C_SDA_PIN) ? 1 : 0;
|
|
}
|
|
|
|
static rt_int32_t drv_get_scl(void *data)
|
|
{
|
|
return HAL_GPIO_ReadPin(I2C_SCL_PORT, I2C_SCL_PIN) ? 1 : 0;
|
|
}
|
|
|
|
static void drv_udelay(rt_uint32_t us)
|
|
{
|
|
int i = (HAL_RCC_GetHCLKFreq() / 4000000 * us);
|
|
while (i)
|
|
{
|
|
i--;
|
|
}
|
|
}
|
|
|
|
static const struct rt_i2c_bit_ops drv_bit_ops =
|
|
{
|
|
RT_NULL,
|
|
drv_set_sda,
|
|
drv_set_scl,
|
|
drv_get_sda,
|
|
drv_get_scl,
|
|
drv_udelay,
|
|
1,
|
|
100
|
|
};
|
|
|
|
int drv_i2c_init(void)
|
|
{
|
|
static struct rt_i2c_bus_device i2c2_bus;
|
|
drv_i2c_gpio_init();
|
|
rt_memset((void *)&i2c2_bus, 0, sizeof(struct rt_i2c_bus_device));
|
|
i2c2_bus.priv = (void *)&drv_bit_ops;
|
|
rt_i2c_bit_add_bus(&i2c2_bus, I2C_BUS_NAME);
|
|
return RT_EOK;
|
|
}
|
|
INIT_DEVICE_EXPORT(drv_i2c_init);
|
|
/* end of i2c driver */
|