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mbed/drivers/PortIn.h

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+/* 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_PORTIN_H
+#define MBED_PORTIN_H
+
+#include "platform/platform.h"
+
+#if DEVICE_PORTIN
+
+#include "hal/port_api.h"
+#include "platform/mbed_critical.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+
+/** A multiple pin digital input
+ *
+ * @Note Synchronization level: Interrupt safe
+ *
+ *  Example:
+ * @code
+ * // Switch on an LED if any of mbed pins 21-26 is high
+ *
+ * #include "mbed.h"
+ *
+ * PortIn     p(Port2, 0x0000003F);   // p21-p26
+ * DigitalOut ind(LED4);
+ *
+ * int main() {
+ *     while(1) {
+ *         int pins = p.read();
+ *         if(pins) {
+ *             ind = 1;
+ *         } else {
+ *             ind = 0;
+ *         }
+ *     }
+ * }
+ * @endcode
+ */
+class PortIn {
+public:
+
+    /** Create an PortIn, connected to the specified port
+     *
+     *  @param port Port to connect to (Port0-Port5)
+     *  @param mask A bitmask to identify which bits in the port should be included (0 - ignore)
+        */
+    PortIn(PortName port, int mask = 0xFFFFFFFF) {
+        core_util_critical_section_enter();
+        port_init(&_port, port, mask, PIN_INPUT);
+        core_util_critical_section_exit();
+    }
+
+    /** Read the value currently output on the port
+     *
+     *  @returns
+     *    An integer with each bit corresponding to associated port pin setting
+     */
+    int read() {
+        return port_read(&_port);
+    }
+
+    /** Set the input pin mode
+     *
+     *  @param mode PullUp, PullDown, PullNone, OpenDrain
+     */
+    void mode(PinMode mode) {
+        core_util_critical_section_enter();
+        port_mode(&_port, mode);
+        core_util_critical_section_exit();
+    }
+
+    /** A shorthand for read()
+     */
+    operator int() {
+        return read();
+    }
+
+private:
+    port_t _port;
+};
+
+} // namespace mbed
+
+#endif
+
+#endif
+
+/** @}*/