Merge pull request #9 from scartmell-arm/add-example-queue

Add Queue example code used in documentation to repository

Author: Cruz Monrreal

Queue/README.md

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+# Queue Example
+
+This example shows Queue and MemoryPool managing measurements.
+

Queue/main.cpp

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+#include "mbed.h"
+
+typedef struct {
+    float    voltage;   /* AD result of measured voltage */
+    float    current;   /* AD result of measured current */
+    uint32_t counter;   /* A counter value               */
+} message_t;
+
+MemoryPool<message_t, 16> mpool;
+Queue<message_t, 16> queue;
+Thread thread;
+
+/* Send Thread */
+void send_thread (void) {
+    uint32_t i = 0;
+    while (true) {
+        i++; // fake data update
+        message_t *message = mpool.alloc();
+        message->voltage = (i * 0.1) * 33;
+        message->current = (i * 0.1) * 11;
+        message->counter = i;
+        queue.put(message);
+        wait(1);
+    }
+}
+
+int main (void) {
+    thread.start(callback(send_thread));
+
+    while (true) {
+        osEvent evt = queue.get();
+        if (evt.status == osEventMessage) {
+            message_t *message = (message_t*)evt.value.p;
+            printf("\r\n");
+            printf("Voltage: %.2f V\r\n"     , message->voltage);
+            printf("Current: %.2f A\r\n"     , message->current);
+            printf("Number of cycles: %u\r\n", message->counter);
+
+            mpool.free(message);
+        }
+    }
+}

Queue/mbed-os.lib

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+https://github.com/ARMmbed/mbed-os/#c53d51fe9220728bf8ed27afe7afc1ecc3f6f5d7