[bsp][stm32f429-disco] Add i2c support

bsp/stm32f429-disco/drivers/drv_i2c.c

+/*
+ * 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_GPIOA_CLK_ENABLE();
+	__HAL_RCC_GPIOC_CLK_ENABLE();
+    
+	GPIO_Initure.Pin = GPIO_PIN_8;
+	GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
+	GPIO_Initure.Pull = GPIO_PULLUP;
+	GPIO_Initure.Speed = GPIO_SPEED_FAST;
+	HAL_GPIO_Init(GPIOA, &GPIO_Initure);
+	
+	GPIO_Initure.Pin = GPIO_PIN_9;
+	GPIO_Initure.Mode = GPIO_MODE_OUTPUT_OD;
+	GPIO_Initure.Pull = GPIO_PULLUP;
+	GPIO_Initure.Speed = GPIO_SPEED_FAST;
+	HAL_GPIO_Init(GPIOC, &GPIO_Initure);
+    
+    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET);
+    HAL_GPIO_WritePin(GPIOC, GPIO_PIN_9, GPIO_PIN_SET);
+}
+
+static void stm32f4_set_sda(void *data, rt_int32_t state)
+{
+	HAL_GPIO_WritePin(GPIOC, GPIO_PIN_9, (GPIO_PinState)state);
+}
+
+static void stm32f4_set_scl(void *data, rt_int32_t state)
+{
+	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, (GPIO_PinState)state);
+}
+
+static rt_int32_t  stm32f4_get_sda(void *data)
+{
+	return (rt_int32_t)HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_9);
+}
+
+static rt_int32_t  stm32f4_get_scl(void *data)
+{
+	return (rt_int32_t)HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_8);
+}
+
+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, "i2c3");
+
+	return RT_EOK;
+}
+INIT_DEVICE_EXPORT(stm32f4_i2c_init);

bsp/stm32f429-disco/drivers/drv_i2c.h

+/*
+* File      : drv_i2c.h
+* 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.
+*/
+
+#ifndef STM32F4XX_IIC_INCLUDED
+#define STM32F4XX_IIC_INCLUDED
+
+#include <rtthread.h>
+#include <drivers/spi.h>
+
+#include "stm32f4xx_hal.h"
+
+
+#endif // STM32F20X_40X_SPI_H_INCLUDED