[components][drivers] add encoder driven framework

components/drivers/misc/SConscript

@@ -13,6 +13,9 @@ if GetDepend(['RT_USING_ADC']):
     
 if GetDepend(['RT_USING_PWM']):
     src = src + ['rt_drv_pwm.c']
+    
+if GetDepend(['RT_USING_ENCODER']):
+    src = src + ['encoder.c']
 
 if len(src):
     group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)

components/drivers/misc/encoder.c

@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-08-08     balanceTWK   the first version
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+
+static rt_err_t rt_encoder_init(struct rt_device *dev)
+{
+    rt_encoder_t *encoder;
+
+    encoder = (rt_encoder_t *)dev;
+    if (encoder->ops->init)
+    {
+        return encoder->ops->init(encoder);
+    }
+    else
+    {
+        return -RT_ENOSYS;
+    }
+}
+
+static rt_err_t rt_encoder_open(struct rt_device *dev, rt_uint16_t oflag)
+{
+    rt_encoder_t *encoder;
+
+    encoder = (rt_encoder_t *)dev;
+    if (encoder->ops->control)
+    {
+        return encoder->ops->control(encoder, ENCODER_SWITCH_ON, RT_NULL);
+    }
+    else
+    {
+        return -RT_ENOSYS;
+    }
+}
+
+static rt_err_t rt_encoder_close(struct rt_device *dev)
+{
+    rt_encoder_t *encoder;
+
+    encoder = (rt_encoder_t *)dev;
+    if (encoder->ops->control)
+    {
+        return encoder->ops->control(encoder, ENCODER_SWITCH_OFF, RT_NULL);
+    }
+    else
+    {
+        return -RT_ENOSYS;
+    }
+}
+
+static rt_size_t rt_encoder_read(struct rt_device *dev, rt_off_t pos, void *buffer, rt_size_t size)
+{
+    rt_encoder_t *encoder;
+
+    encoder = (rt_encoder_t *)dev;
+    if (encoder->ops->get_count)
+    {
+        *(rt_int32_t *)buffer = encoder->ops->get_count(encoder);
+    }
+    return 1;
+}
+
+static rt_err_t rt_encoder_control(struct rt_device *dev, int cmd, void *args)
+{
+    rt_err_t result;
+    rt_encoder_t *encoder;
+
+    result = RT_EOK;
+    encoder = (rt_encoder_t *)dev;
+    switch (cmd)
+    {
+    case ENCODER_INFO_GET:
+        *(struct rt_encoder_info *)args = *encoder->info;
+        break;
+    case ENCODER_SWITCH_ON:
+    case ENCODER_SWITCH_OFF:
+    case ENCODER_COUNT_CLEAR:
+        result = encoder->ops->control(encoder, cmd, args);
+        break;
+    default:
+        result = -RT_ENOSYS;
+        break;
+    }
+
+    return result;
+}
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops encoder_ops =
+{
+    rt_encoder_init,
+    rt_encoder_open,
+    rt_encoder_close,
+    rt_encoder_read,
+    RT_NULL,
+    rt_encoder_control
+};
+#endif
+
+rt_err_t rt_device_encoder_register(rt_encoder_t *encoder, const char *name, void *user_data)
+{
+    struct rt_device *device;
+
+    RT_ASSERT(encoder != RT_NULL);
+    RT_ASSERT(encoder->ops != RT_NULL);
+    RT_ASSERT(encoder->info != RT_NULL);
+
+    device = &(encoder->parent);
+
+    device->type        = RT_Device_Class_Miscellaneous;
+    device->rx_indicate = RT_NULL;
+    device->tx_complete = RT_NULL;
+
+#ifdef RT_USING_DEVICE_OPS
+    device->ops         = &encoder_ops;
+#else
+    device->init        = rt_encoder_init;
+    device->open        = rt_encoder_open;
+    device->close       = rt_encoder_close;
+    device->read        = rt_encoder_read;
+    device->write       = RT_NULL;
+    device->control     = rt_encoder_control;
+#endif
+    device->user_data   = user_data;
+
+    return rt_device_register(device, name, RT_DEVICE_FLAG_RDONLY | RT_DEVICE_FLAG_STANDALONE);
+}