Revision 0:08313411c8a1, committed 2011-01-16

Comitter:

okini3939

Date:

Sun Jan 16 03:09:47 2011 +0000

Commit message:

Changed in this revision

diff -r 000000000000 -r 08313411c8a1 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jan 16 03:09:47 2011 +0000
@@ -0,0 +1,55 @@
+#include "mbed.h"
+#include <math.h>
+
+Ticker ticker;
+volatile long val;
+volatile int offset, count;
+
+DigitalOut myled(LED1);
+AnalogIn adc_offset(p15), adc_watt1(p16), adc_watt3(p18);
+Serial pc(USBTX, USBRX); 
+
+void sample_watt () {
+    int i;
+
+    i = ((adc_watt3.read_u16() >> 4) & 0x0fff) - offset;
+    if (i < -1 || i > 1) {
+        val = val + (i * i);
+    }
+    count ++;
+}
+
+int main() {
+    float v, f, g;
+
+    offset = (adc_offset.read_u16() >> 4) & 0x0fff;
+    val = 0;
+    count = 0;
+
+    ticker.attach_us(&sample_watt, 100); // 10kHz
+    pc.printf("begin\r\n");
+
+    while(1) {
+        if (count >= 10000) {
+            myled = 1;
+            // RMS
+            __disable_irq();
+            v = sqrt((float)val / count) * (3.3 / 0x1000);
+            f = v / (0.99 * 330.0 / 3000.0);
+            val = 0;
+            count = 0;
+
+            g = ((adc_watt1.read_u16() >> 4) & 0x0fff) - offset;
+            g = g * (3.3 / 0x1000);
+            g = g / (0.99 * 330.0 / 3000.0); 
+
+            offset = (adc_offset.read_u16() >> 4) & 0x0fff;
+            __enable_irq();
+
+            pc.printf("%.2f A ave , ", g);
+            pc.printf("%.2f A rms\r\n", f);
+
+            myled = 0;
+        }
+    }
+}

diff -r 000000000000 -r 08313411c8a1 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Jan 16 03:09:47 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e