114 lines
2.2 KiB
C
114 lines
2.2 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_iic.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
|
|
|
|
static void stm32f4_i2c_gpio_init()
|
|
{
|
|
GPIO_InitTypeDef GPIO_Initure;
|
|
|
|
__HAL_RCC_GPIOH_CLK_ENABLE();
|
|
|
|
GPIO_Initure.Pin = GPIO_PIN_4 | GPIO_PIN_5;
|
|
GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
|
|
GPIO_Initure.Pull = GPIO_PULLUP;
|
|
GPIO_Initure.Speed = GPIO_SPEED_FAST;
|
|
HAL_GPIO_Init(GPIOH, &GPIO_Initure);
|
|
|
|
HAL_GPIO_WritePin(GPIOH, GPIO_PIN_5, GPIO_PIN_SET);
|
|
HAL_GPIO_WritePin(GPIOH, GPIO_PIN_4, GPIO_PIN_SET);
|
|
}
|
|
|
|
static void stm32f4_set_sda(void *data, rt_int32_t state)
|
|
{
|
|
HAL_GPIO_WritePin(GPIOH, GPIO_PIN_5, (GPIO_PinState)state);
|
|
}
|
|
|
|
static void stm32f4_set_scl(void *data, rt_int32_t state)
|
|
{
|
|
HAL_GPIO_WritePin(GPIOH, GPIO_PIN_4, (GPIO_PinState)state);
|
|
}
|
|
|
|
static rt_int32_t stm32f4_get_sda(void *data)
|
|
{
|
|
return (rt_int32_t)HAL_GPIO_ReadPin(GPIOH, GPIO_PIN_5);
|
|
}
|
|
|
|
static rt_int32_t stm32f4_get_scl(void *data)
|
|
{
|
|
return (rt_int32_t)HAL_GPIO_ReadPin(GPIOH, GPIO_PIN_4);
|
|
}
|
|
|
|
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,
|
|
|
|
5,
|
|
100
|
|
};
|
|
|
|
int stm32f4_i2c_init(void)
|
|
{
|
|
struct rt_i2c_bus_device *bus;
|
|
|
|
bus = rt_malloc(sizeof(struct rt_i2c_bus_device));
|
|
if (bus == RT_NULL)
|
|
{
|
|
rt_kprintf("rt_malloc failed\n");
|
|
return -RT_ENOMEM;
|
|
}
|
|
|
|
rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus_device));
|
|
|
|
bus->priv = (void *)&bit_ops;
|
|
|
|
stm32f4_i2c_gpio_init();
|
|
|
|
rt_i2c_bit_add_bus(bus, "i2c0");
|
|
|
|
return RT_EOK;
|
|
}
|
|
INIT_DEVICE_EXPORT(stm32f4_i2c_init);
|