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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* 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_FREQ_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_FREQ_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)
{
__IO uint32_t Delay = us * (SystemCoreClock / 8U / 1000000U);
do
{
__NOP();
}
while (Delay --);
}
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 */
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