NXP fan (in Japan)
Sample code for testing PwmOut setting range
Information
Program sample for https://twitter.com/nxpfan/status/559538527306649601
Revision 0:2033fe73a33d, committed 2015-01-26
- Comitter:
- nxpfan
- Date:
- Mon Jan 26 02:27:03 2015 +0000
- Commit message:
- sample code for testing PwmOut setting range
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /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 );
+ }
+ }
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jan 26 02:27:03 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5 \ No newline at end of file