龙芯1c平台的rtt统一标准的I2C接口

bsp/ls1cdev/drivers/drv_i2c.c

+/*
+ * File      : drv_i2c.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2012, 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
+ * 2017-11-14     勤为本       first version
+ */
+
+#include <rtthread.h>
+#include <drivers/i2c.h>
+#include <drivers/i2c-bit-ops.h>
+#include "drv_i2c.h"
+#include "../libraries/ls1c_gpio.h"
+#include "../libraries/ls1c_delay.h"
+
+
+#define LS1C_I2C_SCL                (57)    // gpio57
+#define LS1C_I2C_SDA                (56)    // gpio56
+
+#define LS1C_SET_GPIO_MODE
+
+static void ls1c_i2c_gpio_init(void)
+{
+    gpio_init(LS1C_I2C_SCL, gpio_mode_output);
+    gpio_set(LS1C_I2C_SCL, gpio_level_high);
+
+    gpio_init(LS1C_I2C_SDA, gpio_mode_output);
+    gpio_set(LS1C_I2C_SDA, gpio_level_high);
+
+    return ;
+}
+
+
+static void ls1c_udelay(rt_uint32_t us)
+{
+    delay_us((int)us);
+}
+
+
+static void ls1c_set_sda(void *data, rt_int32_t state)
+{
+#ifdef LS1C_SET_GPIO_MODE
+    gpio_init(LS1C_I2C_SDA, gpio_mode_output);
+    ls1c_udelay(5);
+#endif
+    gpio_set(LS1C_I2C_SDA, state);
+    return ;
+}
+
+
+static void ls1c_set_scl(void *data, rt_int32_t state)
+{
+#ifdef LS1C_SET_GPIO_MODE
+    gpio_init(LS1C_I2C_SCL, gpio_mode_output);
+    ls1c_udelay(5);
+#endif
+    gpio_set(LS1C_I2C_SCL, state);
+    return ;
+}
+
+
+static rt_int32_t ls1c_get_sda(void *data)
+{
+#ifdef LS1C_SET_GPIO_MODE
+    gpio_init(LS1C_I2C_SDA, gpio_mode_input);
+    ls1c_udelay(5);
+#endif
+    return gpio_get(LS1C_I2C_SDA);
+}
+
+
+static rt_int32_t ls1c_get_scl(void *data)
+{
+#ifdef LS1C_SET_GPIO_MODE
+    gpio_init(LS1C_I2C_SCL, gpio_mode_input);
+    ls1c_udelay(5);
+#endif
+    return gpio_get(LS1C_I2C_SCL);
+}
+
+
+static const struct rt_i2c_bit_ops bit_ops = {
+    .data       = RT_NULL,
+    .set_sda    = ls1c_set_sda,
+    .set_scl    = ls1c_set_scl,
+    .get_sda    = ls1c_get_sda,
+    .get_scl    = ls1c_get_scl,
+
+    .udelay     = ls1c_udelay,
+
+    .delay_us   = 20,       // 此值为周期(us)
+    .timeout    = 10,       // 单位为tick
+};
+
+
+
+int ls1c_i2c_init(void)
+{
+    static struct rt_i2c_bus_device bus = {0};
+
+    bus.priv = (void *)&bit_ops;
+
+    ls1c_i2c_gpio_init();
+
+    rt_i2c_bit_add_bus(&bus, "i2c2");
+
+    return RT_EOK;
+}
+
+
+
+
+

bsp/ls1cdev/drivers/drv_i2c.h

+/*
+ * File      : drv_i2c.h
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006 - 2012, 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
+ * 2017-11-14     ÇÚΪ±¾       first version
+ */
+
+#ifndef LS1C_DRV_I2C_H
+#define LS1C_DRV_I2C_H
+
+
+int ls1c_i2c_init(void);
+
+
+
+#endif
+

bsp/ls1cdev/rtconfig.h

@@ -231,6 +231,9 @@
 #define RT_USING_SPI0
 #define RT_USING_SPI1
 
+#define RT_USING_I2C
+#define RT_USING_I2C_BITOPS
+
 
 // </RDTConfigurator>