[Bsp][stm32f1xx-hal]添加I2C驱动

bsp/stm32f10x-HAL/drivers/SConscript

@@ -20,6 +20,8 @@ if GetDepend(['RT_USING_USB_DEVICE']):
     src += ['drv_usb.c']
 if GetDepend(['RT_USING_SDCARD']):
     src += ['drv_sdcard.c']
+if GetDepend(['RT_USING_I2C', 'RT_USING_I2C_BITOPS']):
+    src += ['drv_i2c.c']
 
 if rtconfig.CROSS_TOOL == 'gcc':
     src += ['gcc_startup.s']

bsp/stm32f10x-HAL/drivers/drv_i2c.c

+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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)
+{
+    __IO uint32_t Delay = us * (SystemCoreClock / 8U / 1000000U);
+    do 
+    {
+        __NOP();
+    } 
+    while (Delay --);
+}
+
+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/stm32f10x-HAL/drivers/drv_i2c.h

+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-06-05     tanek        first implementation.
+ */
+#ifndef __DRV_I2C__
+#define __DRV_I2C__
+int hw_i2c_init(void);
+#endif