Diff: AnalogOut.h

Revision:

0:a8fa94490a0a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AnalogOut.h	Sat Sep 22 10:32:07 2012 +0000
@@ -0,0 +1,112 @@
+/* mbed Microcontroller Library - AnalogOut
+ * Copyright (c) 2006-2011 ARM Limited. All rights reserved.
+ */ 
+ 
+#ifndef MBED_ANALOGOUT_H
+#define MBED_ANALOGOUT_H
+
+#include "device.h"
+
+#if DEVICE_ANALOGOUT
+
+#include "platform.h"
+#include "PinNames.h"
+#include "PeripheralNames.h"
+#include "Base.h"
+
+namespace mbed {
+
+/* Class: AnalogOut
+ *  An analog output, used for setting the voltage on a pin
+ *
+ * Example:
+ * > // Make a sawtooth output
+ * > 
+ * > #include "mbed.h"
+ * > 
+ * > AnalogOut tri(p18);
+ * > int main() {
+ * >     while(1) {
+ * >         tri = tri + 0.01;
+ * >         wait_us(1);
+ * >         if(tri == 1) {
+ * >             tri = 0;
+ * >         }
+ * >     }
+ * > }
+ */
+class AnalogOut : public Base {
+
+public:
+
+	/* Constructor: AnalogOut
+	 *  Create an AnalogOut connected to the specified pin
+	 * 
+	 * Variables:
+	 *  pin - AnalogOut pin to connect to (18)
+	 */
+	AnalogOut(PinName pin, const char *name = NULL);
+	
+    /* Function: write
+     *  Set the output voltage, specified as a percentage (float)
+     *
+     * Variables:
+     *  percent - A floating-point value representing the output voltage, 
+     *    specified as a percentage. The value should lie between
+     *    0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
+     *    Values outside this range will be saturated to 0.0f or 1.0f.	 
+     */
+    void write(float value);
+    
+    /* Function: write_u16
+     *  Set the output voltage, represented as an unsigned short in the range [0x0, 0xFFFF]
+     *
+     * Variables:
+     *  value - 16-bit unsigned short representing the output voltage,
+     *            normalised to a 16-bit value (0x0000 = 0v, 0xFFFF = 3.3v)
+     */
+    void write_u16(unsigned short value);
+
+    /* Function: read
+     *  Return the current output voltage setting, measured as a percentage (float)
+     *
+     * Variables:
+     *  returns - A floating-point value representing the current voltage being output on the pin, 
+     *    measured as a percentage. The returned value will lie between
+     *    0.0f (representing 0v / 0%) and 1.0f (representing 3.3v / 100%).
+     *
+     * Note:
+     *  This value may not match exactly the value set by a previous <write>.
+     */	
+    float read();
+
+
+#ifdef MBED_OPERATORS
+    /* Function: operator=
+     *  An operator shorthand for <write()>
+     */
+	AnalogOut& operator= (float percent);
+	AnalogOut& operator= (AnalogOut& rhs);
+
+    /* Function: operator float()
+     *  An operator shorthand for <read()>
+     */	
+	operator float();
+#endif
+
+#ifdef MBED_RPC
+    virtual const struct rpc_method *get_rpc_methods();
+    static struct rpc_class *get_rpc_class();
+#endif
+
+protected:
+
+	DACName _dac;
+
+};
+
+} // namespace mbed
+
+#endif
+
+#endif