Diff: mbed/BusOut.h

Revision:

0:871ab6846b18

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed/BusOut.h	Mon Feb 19 08:51:33 2018 +0000
@@ -0,0 +1,81 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_BUSOUT_H
+#define MBED_BUSOUT_H
+
+#include "DigitalOut.h"
+
+namespace mbed {
+
+/** A digital output bus, used for setting the state of a collection of pins
+ */
+class BusOut {
+
+public:
+
+    /** Create an BusOut, connected to the specified pins
+     *
+     *  @param p<n> DigitalOut pin to connect to bus bit <n> (p5-p30, NC)
+     *
+     *  @note
+     *  It is only required to specify as many pin variables as is required
+     *  for the bus; the rest will default to NC (not connected)
+     */
+    BusOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
+           PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
+           PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
+           PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
+
+    BusOut(PinName pins[16]);
+
+    virtual ~BusOut();
+
+    /** Write the value to the output bus
+     *
+     *  @param value An integer specifying a bit to write for every corresponding DigitalOut pin
+     */
+    void write(int value);
+
+    /** Read the value currently output on the bus
+     *
+     *  @returns
+     *    An integer with each bit corresponding to associated DigitalOut pin setting
+     */
+    int read();
+
+#ifdef MBED_OPERATORS
+    /** A shorthand for write()
+     */
+    BusOut& operator= (int v);
+    BusOut& operator= (BusOut& rhs);
+
+    /** A shorthand for read()
+     */
+    operator int();
+#endif
+
+protected:
+    DigitalOut* _pin[16];
+
+   /* disallow copy constructor and assignment operators */
+private:
+    BusOut(const BusOut&);
+    BusOut & operator = (const BusOut&);
+};
+
+} // namespace mbed
+
+#endif