Merge pull request #1277 from uestczyh222/master

[Bsp][STM32F4xx-HAL]Add I2C driver

bsp/stm32f4xx-HAL/drivers/SConscript

@@ -30,8 +30,13 @@ if GetDepend(['RT_USING_USB_DEVICE']):
 
 if GetDepend(['RT_USING_RTC']):
     src += ['drv_rtc.c']
+
 if GetDepend(['RT_USING_USB_HOST']):
     src += ['drv_usbh.c']
+
+if GetDepend(['RT_USING_I2C']):
+	src += ['drv_i2c.c']
+
 CPPPATH = [cwd]
 
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = CPPPATH)

bsp/stm32f4xx-HAL/drivers/drv_i2c.c

+/*
+ * File      : drv_i2c.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * 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_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_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)
+{
+    int i = ( HAL_RCC_GetHCLKFreq() / 4000000 * us);
+    while(i)
+    {
+        i--;
+    }
+}
+
+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 */

bsp/stm32f4xx-HAL/drivers/drv_i2c.h

+/*
+ * File      : drv_i2c.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2018, RT-Thread Development Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-06-05     tanek        first implementation.
+ */
+
+#ifndef __DRV_I2C__
+#define __DRV_I2C__
+
+int hw_i2c_init(void);
+
+#endif