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mbed/drivers/PortOut.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_PORTOUT_H
+#define MBED_PORTOUT_H
+
+#include "platform/platform.h"
+
+#if DEVICE_PORTOUT
+
+#include "hal/port_api.h"
+#include "platform/mbed_critical.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+/** A multiple pin digital out
+ *
+ * @Note Synchronization level: Interrupt safe
+ *
+ * Example:
+ * @code
+ * // Toggle all four LEDs
+ *
+ * #include "mbed.h"
+ *
+ * // LED1 = P1.18  LED2 = P1.20  LED3 = P1.21  LED4 = P1.23
+ * #define LED_MASK 0x00B40000
+ *
+ * PortOut ledport(Port1, LED_MASK);
+ *
+ * int main() {
+ *     while(1) {
+ *         ledport = LED_MASK;
+ *         wait(1);
+ *         ledport = 0;
+ *         wait(1);
+ *     }
+ * }
+ * @endcode
+ */
+class PortOut {
+public:
+
+    /** Create an PortOut, 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)
+     */
+    PortOut(PortName port, int mask = 0xFFFFFFFF) {
+        core_util_critical_section_enter();
+        port_init(&_port, port, mask, PIN_OUTPUT);
+        core_util_critical_section_exit();
+    }
+
+    /** Write the value to the output port
+     *
+     *  @param value An integer specifying a bit to write for every corresponding PortOut pin
+     */
+    void write(int value) {
+        port_write(&_port, value);
+    }
+
+    /** Read the value currently output on the port
+     *
+     *  @returns
+     *    An integer with each bit corresponding to associated PortOut pin setting
+     */
+    int read() {
+        return port_read(&_port);
+    }
+
+    /** A shorthand for write()
+     */
+    PortOut& operator= (int value) {
+        write(value);
+        return *this;
+    }
+
+    PortOut& operator= (PortOut& rhs) {
+        write(rhs.read());
+        return *this;
+    }
+
+    /** A shorthand for read()
+     */
+    operator int() {
+        return read();
+    }
+
+private:
+    port_t _port;
+};
+
+} // namespace mbed
+
+#endif
+
+#endif
+
+/** @}*/