Diff: main.cpp

Revision:

0:be447af0921d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 25 14:32:50 2011 +0000
@@ -0,0 +1,52 @@
+#include "counter.h"
+
+//todo: implement 2k sample buffer and store results until client connects, implement real time clock
+
+Serial pc(USBTX, USBRX);
+counter SF800 (p29);
+Timer t_a, t_b;
+
+int main() {
+
+    t_a.start();
+    t_b.start();
+    int a_init_pulses = 0;
+    int b_init_pulses = 0;
+    float flowrate = 0;
+    int time_window = 10000;
+
+    bool a_b_flip_flop = true; // if true use window a
+    
+    pc.printf("\n\r*************\n\rMBED restarted\n\r*************\n");
+
+    while (1) {
+        wait(0.1);
+
+        if (a_b_flip_flop) {
+            flowrate = (float)(SF800.getPulses() - a_init_pulses)/(6000 * t_a.read_ms() / 60000);
+        } else {
+            flowrate = (float)(SF800.getPulses() - b_init_pulses)/(6000 * t_b.read_ms() / 60000);
+        }
+
+        if (t_a.read_ms() > time_window) { // switch to window B
+        
+            pc.printf("\rswitching to window B = %i pulses detected in window A\n", SF800.getPulses() - a_init_pulses);
+        
+            t_a.reset();
+            a_b_flip_flop = false;
+            a_init_pulses =  SF800.getPulses();
+        }
+        
+        if (t_a.read_ms() > time_window/2 && !a_b_flip_flop) { // switch to window A
+        
+            pc.printf("\rswitching to window A = %i pulses detected in window B\n", SF800.getPulses() - b_init_pulses);
+        
+            t_b.reset();
+            a_b_flip_flop = true;
+            b_init_pulses =  SF800.getPulses();
+        }
+
+        pc.printf("\rflowrate = %f l/min", flowrate);
+    }
+
+}