[add] adc framework

components/drivers/include/drivers/adc.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-05-07     aozima       the first version
+ * 2018-11-16     Ernest Chen  add finsh command and update adc function
+ */
+
+#ifndef __ADC_H__
+#define __ADC_H__
+#include <rtthread.h>
+
+struct rt_adc_device;
+struct rt_adc_ops
+{
+    rt_err_t (*enabled)(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled);
+    rt_err_t (*convert)(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value);
+};
+
+struct rt_adc_device
+{
+    struct rt_device parent;
+    const struct rt_adc_ops *ops;
+};
+typedef struct rt_adc_device *rt_adc_device_t;
+
+typedef enum
+{
+    RT_ADC_CMD_ENABLE,
+    RT_ADC_CMD_DISABLE,
+} rt_adc_cmd_t;
+
+rt_err_t rt_hw_adc_register(rt_adc_device_t adc,const char *name, const struct rt_adc_ops *ops, const void *user_data);
+
+rt_uint32_t rt_adc_read(rt_adc_device_t dev, rt_uint32_t channel);
+rt_err_t rt_adc_enable(rt_adc_device_t dev, rt_uint32_t channel);
+rt_err_t rt_adc_disable(rt_adc_device_t dev, rt_uint32_t channel);
+
+#endif /* __ADC_H__ */

components/drivers/include/rtdevice.h

@@ -99,6 +99,10 @@ extern "C" {
 #include "drivers/cputime.h"
 #endif
 
+#ifdef RT_USING_ADC
+#include "drivers/adc.h"
+#endif
+
 #ifdef RT_USING_PWM
 #include "drivers/rt_drv_pwm.h"
 #endif