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/*
* File : drv_i2c.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
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);
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