Diff: cpp/AnalogIn.h

Revision:

0:fd0d7bdfcdc2

Child:

2:143cac498751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cpp/AnalogIn.h	Tue Nov 20 17:24:08 2012 +0000
@@ -0,0 +1,109 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef MBED_ANALOGIN_H
+#define MBED_ANALOGIN_H
+
+#include "platform.h"
+
+#if DEVICE_ANALOGIN
+
+#include "analogin_api.h"
+
+namespace mbed {
+
+/** An analog input, used for reading the voltage on a pin
+ *
+ * Example:
+ * @code
+ * // Print messages when the AnalogIn is greater than 50%
+ * 
+ * #include "mbed.h"
+ * 
+ * AnalogIn temperature(p20);
+ * 
+ * int main() {
+ *     while(1) {
+ *         if(temperature > 0.5) {
+ *             printf("Too hot! (%f)", temperature.read());
+ *         }
+ *     }
+ * }
+ * @endcode
+ */
+class AnalogIn {
+
+public:
+
+    /** Create an AnalogIn, connected to the specified pin
+     *
+     * @param pin AnalogIn pin to connect to 
+     * @param name (optional) A string to identify the object
+     */
+    AnalogIn(PinName pin) {
+        analogin_init(&_adc, pin);
+    }
+    
+    /** Read the input voltage, represented as a float in the range [0.0, 1.0]
+     *
+     * @returns A floating-point value representing the current input voltage, measured as a percentage
+     */
+    float read() {
+        return analogin_read(&_adc);
+    }
+
+    /** Read the input voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
+     *
+     * @returns
+     *   16-bit unsigned short representing the current input voltage, normalised to a 16-bit value 
+     */
+    unsigned short read_u16() {
+        return analogin_read_u16(&_adc);
+    }
+
+#ifdef MBED_OPERATORS
+    /** An operator shorthand for read()
+     *
+     * The float() operator can be used as a shorthand for read() to simplify common code sequences
+     *
+     * Example:
+     * @code
+     * float x = volume.read();
+     * float x = volume;
+     * 
+     * if(volume.read() > 0.25) { ... }
+     * if(volume > 0.25) { ... }
+     * @endcode
+     */
+    operator float() {
+        return read();
+    }
+#endif
+
+protected:
+    analogin_t _adc;
+};
+
+} // namespace mbed
+
+#endif
+
+#endif