Diff: GasUseCounter.cpp

Revision:

5:5bccf48799d4

Child:

19:0367cb46d003

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/GasUseCounter.cpp	Tue Feb 17 21:33:39 2015 +0000
@@ -0,0 +1,71 @@
+#include "GasUseCounter.h"
+
+// Callback from web server to handle getting current gas count
+char* GasUseCounter::getGasUseCallback(char* cmdStr, char* argStr)
+{
+    sprintf(_gasCountStr, "{\"gasUseCount\":\"%d\"}", GetCount());
+    return _gasCountStr;
+}
+
+// Init
+void GasUseCounter::Init()
+{
+    GetGasCountFromSD();
+}
+    
+// Service function
+bool GasUseCounter::Service()
+{
+    // Check for an edge
+    bool edgeDetected = _pulseDetector->Service();
+    if (edgeDetected)
+    {
+        // Check if we need to store in non-volatile storage
+        if (GetCount() >= _lastWrittenGasCount + MAX_PULSES_BEFORE_STORE_NV)
+        {
+            WriteGasCountToSD();
+            _lastWrittenGasCount = GetCount();
+        }
+            
+        // Show count
+        _pc.printf("Count %d Rate(ms) %d\r\n", _pulseDetector->GetPulseCount(), _pulseDetector->GetPulseRateMs());
+    }   
+    return edgeDetected;
+}
+    
+// Get the current usage count from SD card
+void GasUseCounter::GetGasCountFromSD()
+{
+    FILE* fp = fopen(_gasUseFilename, "r");
+    if (fp == NULL)
+    {
+        _pc.printf ("Read Gas ... Filename %s not found\r\n", _gasUseFilename);
+    }
+    else
+    {
+        int curCount = 0;
+        int retVal = fscanf(fp, "%d", &curCount);
+        fclose(fp);
+        if (retVal == 1)
+            _pc.printf ("Read from SD last gas count = %d\r\n", curCount);
+        else
+            _pc.printf ("Failed to read gas count from SD card\r\n");
+        _lastWrittenGasCount = curCount;
+        _pulseDetector->SetPulseCount(curCount);
+    }
+}
+
+void GasUseCounter::WriteGasCountToSD()
+{
+    FILE* fp = fopen(_gasUseFilename, "w");
+    if (fp == NULL)
+    {
+        _pc.printf ("WriteGas ... Filename %s not found\r\n", _gasUseFilename);
+    }
+    else
+    {
+        fprintf(fp, "%d", GetCount());
+        _pc.printf ("Written to SD last gas count = %d\r\n", GetCount());
+        fclose(fp);
+    }
+}