Diff: main.cpp

Revision:

0:2033fe73a33d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jan 26 02:27:03 2015 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+
+PwmOut  led( LED1 );
+PwmOut  out( p21 );
+Serial  pc( USBTX, USBRX );
+
+#define PWM_CHANGE_STEPS        0.05
+#define PERIOD_CHANGE_FACTOR    2.0
+
+int main()
+{
+    float   period  = 0.001;
+    float   pwm     = 0.5;
+
+    printf( "\r\n\r\nPwmOut period test\r\n" );
+    printf( "  use arrow key to change parameters : \r\n  left/right for period, up/down for PWM ratio\r\n" );
+
+    out.period( period );
+    out = pwm;
+    led = pwm;
+
+    printf( "period = %12g sec, pwm = %3.0f\r", period, pwm * 100.0 );
+    fflush( stdout );
+
+    while(1) {
+        if ( pc.readable() ) {
+            switch ( pc.getc() ) {
+                case 0x1B :
+                    if ( 0x5B == pc.getc() )
+                        //  arrow key pressed
+                        switch ( pc.getc() ) {
+                            case 0x44 : //  left arrow
+                                period   /= PERIOD_CHANGE_FACTOR;
+                                break;
+                            case 0x43 : //  right arrow
+                                period   *= PERIOD_CHANGE_FACTOR;
+                                break;
+                            case 0x41 : //  up arrow
+                                pwm += (pwm >= (1 - PWM_CHANGE_STEPS)) ? 0.0 : PWM_CHANGE_STEPS;
+                                break;
+                            case 0x42 : //  down arrow
+                                pwm -= (pwm <= PWM_CHANGE_STEPS) ? 0.0 : PWM_CHANGE_STEPS;
+                                break;
+                            default :
+                                break;
+                        }
+            }
+            out.period( period );
+            out = pwm;
+            led = pwm;
+
+            printf( "period = %12g sec, pwm = %3.0f\r", period, pwm * 100.0 );
+            fflush( stdout );
+        }
+    }
+}
+