Diff: main.cpp

Revision:

2:cfacbc7be12b

Parent:

1:5160ea45399b

--- a/main.cpp	Sun Sep 21 06:39:30 2014 +0000
+++ b/main.cpp	Thu Jun 22 19:10:11 2017 +0000
@@ -1,12 +1,129 @@
 #include "mbed.h"
+#include <ctype.h>
+#include "FastPWM.h"
 
-PwmOut led(LED1);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+FastPWM pwm(p21);
+DigitalOut trigger(p22);
+//AnalogIn analog_value(p20);
+Serial pc(USBTX, USBRX);
+double dutyCycle=.01;
+
 
+void seekPWM(double newDuty)
+{
+    if (dutyCycle<0.01 or newDuty <0.01)
+    {
+        if (newDuty > dutyCycle) {
+            while (newDuty/dutyCycle > 2) {
+                dutyCycle = dutyCycle * 1.5;
+                trigger=0;
+                pwm.write(dutyCycle);
+                trigger=1;
+                wait_ms(100);
+            }
+        } else {
+            while (newDuty/dutyCycle < .5) {
+                dutyCycle = dutyCycle * 0.75;
+                trigger=0;
+                pwm.write(dutyCycle);
+                trigger=1;
+                wait_ms(100);
+            }
+        }
+    }    
+    trigger=0;
+    dutyCycle = newDuty;
+    pwm.write(dutyCycle);    
+    trigger=1;
+
+
+}    
+    
 int main() {
+    char current_char=0;
+    
     // specify period first
-    led.period(4.0f);      // 4 second period
-    led.write(0.50f);      // 50% duty cycle, relative to period
+    //led.period(0.0050f);      // 200 Hz
+    //pwm.period(0.0100f);      // 100 Hz
+    
+    pwm.period_ms(10);
+    //led.write(0.10f);      // 10% duty cycle, relative to period
+    pwm.write(dutyCycle);       // 1%
     //led = 0.5f;          // shorthand for led.write()
     //led.pulsewidth(2);   // alternative to led.write, set duty cycle time in seconds
-    while(1);
+
+    
+    while(1)
+    {
+       
+        pc.printf("Current duty cycle = %f \r\n ", dutyCycle); 
+        pc.printf("U  to increase duty cycle \r\n ");  
+        pc.printf("D  to decrease duty cycle \r\n ");     
+        pc.printf("R  to ramp duty cycle \r\n ");     
+        pc.printf("Command?");
+        current_char = pc.getc();
+        pc.printf("%c\n\r",current_char);
+        
+        switch (tolower(current_char))
+        {
+            
+            case 'u':
+            {
+                dutyCycle = dutyCycle + 0.0002;
+                trigger=1;
+            }
+            break;
+            case 'd':
+            {
+                dutyCycle = dutyCycle - 0.0002;
+                trigger=1;
+            }
+            break;
+            case 'r':
+            {
+                trigger = 0;
+                seekPWM(0.0001);
+                wait(1.0);
+                trigger=0;
+                seekPWM(0.05);
+                trigger=0;
+                /*
+                trigger=0;
+                dutyCycle = 0.001;
+                pwm.write(dutyCycle);
+                wait(1.0);
+                //int pulseWidthUs = 10;
+                for (int i=0; i< 10;i++)
+                {
+                    trigger=1;
+                    pwm.write(dutyCycle);
+                    //pwm.pulsewidth_us(pulseWidthUs);
+                    pulseWidthUs *= 2;
+                    wait_ms(10);
+                    trigger=0;
+                    wait(1.0);
+                    
+                    //dutyCycle = dutyCycle+(.0001);
+                    pulseWidthUs = pulseWidthUs + 10;
+                    led1.write(i&0x01);
+                    led2.write((i&0x02)>>1);
+                    led3.write((i&0x04)>>2);
+                    led4.write((i&0x08)>>3);
+                }
+                */
+                    
+            }
+            break;
+        }
+        dutyCycle = dutyCycle < 1.0 ? dutyCycle : 1.0;
+        dutyCycle = dutyCycle > 0.0001 ? dutyCycle : 0.0001;
+        pwm.write(dutyCycle);
+        wait_ms(10);
+        trigger=0;
+        
+    } 
 }
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