Diff: main.cpp

Revision:

0:85d6be554642

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Aug 30 13:57:45 2012 +0000
@@ -0,0 +1,178 @@
+/*
+ * (c) Copyright 2012 EVRYTHNG Ltd London / Zurich
+ * www.evrythng.com
+ *
+ * --- DISCLAIMER ---
+ *
+ * EVRYTHNG provides this source code "as is" and without warranty of any kind,
+ * and hereby disclaims all express or implied warranties, including without
+ * limitation warranties of merchantability, fitness for a particular purpose,
+ * performance, accuracy, reliability, and non-infringement.
+ *
+ *
+ * --- READ ME ---
+ *
+ * This is a demo application that uses EVRYTHNG's mbed wrapper to read and
+ * write value to EVRYTHNG's engine. Please refer to the online documentation
+ * available at http://dev.evrythng.com/mbed.
+ *
+ *
+ * Author: Michel Yerly
+ *
+ */
+
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include <time.h>
+#include "EvrythngApi.h"
+#include "util.h"
+#include "eventqueue.h"
+
+/*
+ * Configuration
+ */
+ 
+// Your EVRYTHNG api key.
+const char* API_KEY = "";
+
+// Your thng id, the one that represents your mbed device.
+const char* THNG_ID = "";
+
+// The property you want values to be pushed to.
+const char* THNG_PROP_SET = "prop3";
+
+// The property you want values to be read from.
+const char* THNG_PROP_GET = "prop3";
+
+
+
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+
+static char displayVal = 0;
+
+/*
+ * Displays a value between 0 and 15 as binary on the 4 LEDs.
+ */
+void display(char x)
+{
+    led1 = x & (char)8 ? 1 : 0;
+    led2 = x & (char)4 ? 1 : 0;
+    led3 = x & (char)2 ? 1 : 0;
+    led4 = x & (char)1 ? 1 : 0;
+    displayVal = x;
+}
+
+/*
+ * Flashes the 4 LEDs, and restores the state of the last display().
+ */
+void flash()
+{
+    char s = displayVal;
+    for (int i = 0; i < 2; ++i) {
+        display(0x0F);
+        wait(0.1);
+        display(0x00);
+        wait(0.1);
+    }
+    display(s);
+}
+
+/* 
+ * Function to get the number of milliseconds elapsed since the system startup.
+ * It is imprecise and if called repetitively and quickly, it may always return
+ * the same result. It MUST be called at least every 30 minutes.
+ * NOTE: I'm not proud of it.
+ */
+int64_t getMillis()
+{
+    static Timer tmr;
+    static int64_t clk = 0;
+    
+    tmr.stop();
+    clk += tmr.read_ms();
+    tmr.reset();
+    tmr.start();
+    
+    char str[21];
+    char* end;
+    sprinti64(str, clk, &end);
+    *end = '\0';
+    dbg.printf("%s ", str);
+    
+    return clk;
+}
+
+/*
+ * Entry point.
+ *
+ * This demo application uses an event loop to set and get property values
+ * on EVRYTHNG engine at given intervals.
+ */
+int main()
+{
+    dbg.printf("Initializing ethernet interface\r\n");
+    EthernetInterface eth;
+    eth.init(); //Use DHCP
+    eth.connect();
+    dbg.printf("IP address: %s\r\n", eth.getIPAddress());
+
+    EvrythngApi api(API_KEY);
+
+    // intervals in ms
+    const int SET_INTERVAL = 5000;
+    const int GET_INTERVAL = 2000;
+
+    int curVal = 0;
+    display(curVal);
+
+    int putVal = 0;
+    char strPutVal[3];  
+    int64_t timestamp = 1345736694000LL; // 2012-08-23 10:44:54am EST
+
+    EventQueue eventQueue;
+    eventQueue.put(getMillis()+GET_INTERVAL, EVT_GET_PROP);
+    eventQueue.put(getMillis()+SET_INTERVAL, EVT_SET_PROP);
+
+    while (!eventQueue.empty()) {
+        EventType event = eventQueue.waitNext(getMillis());
+
+        switch (event) {
+
+            case EVT_SET_PROP:
+
+                eventQueue.put(SET_INTERVAL + getMillis(), EVT_SET_PROP);
+
+                putVal = (putVal + 1) & 0xF;
+                sprintf(strPutVal, "%d", putVal);
+                timestamp++;
+                api.setThngPropertyValue(THNG_ID, THNG_PROP_SET, string(strPutVal), timestamp);
+
+                break;
+
+            case EVT_GET_PROP:
+
+                eventQueue.put(GET_INTERVAL + getMillis(), EVT_GET_PROP);
+
+                string v;
+                int r = api.getThngPropertyValue(THNG_ID, THNG_PROP_GET, v);
+                if (r == 0) {
+                    flash();
+                    int newVal = atoi(v.c_str());
+                    if (newVal != curVal) {
+                        curVal = newVal;
+                        display(curVal);
+                    }
+                }
+                break;
+        }
+    }
+
+    dbg.printf("Disconnecting ethernet interface\r\n");
+    eth.disconnect();
+
+    dbg.printf("Done.\r\n");
+    while(1) {}
+}
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