rt-thread-official/bsp/stm32f429-armfly/drivers/drv_i2c.c

114 lines
2.3 KiB
C

/*
* File : drv_iic.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2017 RT-Thread Develop Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2017-06-05 tanek first implementation.
*/
#include "drv_i2c.h"
#include <board.h>
#include <finsh.h>
#include <rtdevice.h>
#include <rthw.h>
#define DEBUG
#ifdef DEBUG
#define DEBUG_PRINTF(...) rt_kprintf(__VA_ARGS__)
#else
#define DEBUG_PRINTF(...)
#endif
#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_9
#define I2C_SDA_PORT GPIOB
#define I2C_SDL_PORT_CLK_ENABLE()
static struct rt_i2c_bus_device i2c_bus;
static void stm32f4_i2c_gpio_init()
{
GPIO_InitTypeDef GPIO_Initure;
I2C_SCL_PORT_CLK_ENABLE();
I2C_SDL_PORT_CLK_ENABLE();
GPIO_Initure.Pin = I2C_SCL_PIN | I2C_SDA_PIN;
GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
GPIO_Initure.Pull = GPIO_NOPULL;
GPIO_Initure.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(I2C_SDA_PORT, &GPIO_Initure);
HAL_GPIO_WritePin(I2C_SDA_PORT, I2C_SDA_PIN, GPIO_PIN_SET);
HAL_GPIO_WritePin(I2C_SCL_PORT, I2C_SCL_PIN, GPIO_PIN_SET);
}
static void stm32f4_set_sda(void *data, rt_int32_t state)
{
HAL_GPIO_WritePin(I2C_SDA_PORT, I2C_SDA_PIN, (GPIO_PinState)state);
}
static void stm32f4_set_scl(void *data, rt_int32_t state)
{
HAL_GPIO_WritePin(I2C_SCL_PORT, I2C_SCL_PIN, (GPIO_PinState)state);
}
static rt_int32_t stm32f4_get_sda(void *data)
{
return (rt_int32_t)HAL_GPIO_ReadPin(I2C_SDA_PORT, I2C_SDA_PIN);
}
static rt_int32_t stm32f4_get_scl(void *data)
{
return (rt_int32_t)HAL_GPIO_ReadPin(I2C_SCL_PORT, I2C_SCL_PIN);
}
static void stm32f4_udelay(rt_uint32_t us)
{
rt_int32_t i;
for (; us > 0; us--)
{
i = 50;
while (i > 0)
{
i--;
}
}
}
static const struct rt_i2c_bit_ops bit_ops = {
RT_NULL,
stm32f4_set_sda,
stm32f4_set_scl,
stm32f4_get_sda,
stm32f4_get_scl,
stm32f4_udelay,
50,
100
};
int stm32f4_i2c_init(void)
{
i2c_bus.priv = (void *)&bit_ops;
stm32f4_i2c_gpio_init();
rt_i2c_bit_add_bus(&i2c_bus, "i2c0");
return RT_EOK;
}
INIT_DEVICE_EXPORT(stm32f4_i2c_init);