Diff: main.cpp

Revision:

0:9bc069e1c225

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Apr 17 14:50:50 2011 +0000
@@ -0,0 +1,38 @@
+/* This program makes a sine wave. This converts 360 degrees 
+into radian every once from 0 and gives it in sine function. 
+The value multiply 0.5 by the result of the calculation and add 0.5 
+to give an offset voltage. As for the value that calculated, 
+it becomes a sin wave of center level 1.65V, 0V at the minimum,
+up to 3.3V with a DA converter in this way. 
+The sine wave is stored in a local file. Extension is .CSV. 
+You can make a graph by Excel and confirm a sine wave.
+*/
+#include "mbed.h"
+#include "TextLCD.h"
+
+TextLCD lcd(p24, p26, p27, p28, p29, p30);
+
+LocalFileSystem local("local");
+DigitalOut busy(LED2);
+AnalogOut DA(p18);
+AnalogIn AD(p20);
+
+int main() {
+    lcd.printf("SinWave\n");
+    FILE *fp;
+
+    if ( NULL == (fp = fopen( "/local/sinewave.csv", "w" )) )
+        error( "" );
+
+    busy  = 1;
+
+    for (float i=0; i<360; i++) {
+        DA = sin(i/180*3.14)*0.5+0.5;
+        wait(0.05);
+        lcd.locate(0,1);
+        lcd.printf("DA out %0.5fV", AD.read()*3.3);
+        fprintf( fp, "%f\n", (float)AD.read()*3.3 );
+    }
+    fclose( fp );
+    busy   = 0;
+}