Diff: main.cpp

Revision:

0:d8abb9cdbd04

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 09 00:33:50 2018 +0000
@@ -0,0 +1,82 @@
+#include "mbed.h"
+#include "PinDetect.h"
+
+//Class to control an RGB LED using three PWM pins
+class RGBLed
+{
+public:
+    RGBLed(PinName redpin, PinName greenpin, PinName bluepin);
+    void write(float red,float green, float blue);
+private:
+    PwmOut _redpin;
+    PwmOut _greenpin;
+    PwmOut _bluepin;
+};
+
+RGBLed::RGBLed (PinName redpin, PinName greenpin, PinName bluepin)
+    : _redpin(redpin), _greenpin(greenpin), _bluepin(bluepin)
+{
+    //50Hz PWM clock default a bit too low, go to 2000Hz (less flicker)
+    _redpin.period(0.0005);
+}
+
+void RGBLed::write(float red,float green, float blue)
+{
+    _redpin = red;
+    _greenpin = green;
+    _bluepin = blue;
+}
+
+//Setup RGB led using PWM pins and class
+RGBLed myRGBled(p21,p22,p23); //RGB PWM pins
+
+DigitalIn r(p24);
+DigitalIn g(p25);
+DigitalIn b(p26);
+
+PinDetect pb1(p8);
+PinDetect pb2(p7);
+
+// Global pwm variable
+float volatile pwm=1.0f;
+
+// Callback routine is interrupt activated by a debounced pb1 hit
+void pb1_hit_callback (void)
+{
+    pwm -= 0.1f;
+    if (pwm < 0.0f) {
+        pwm = 0.0f;
+    }
+}
+
+// Callback routine is interrupt activated by a debounced pb2 hit
+void pb2_hit_callback (void)
+{
+    pwm += 0.1f;
+    if (pwm > 1.0f) {
+        pwm = 1.0f;
+    }
+}
+
+int main()
+{
+    r.mode(PullUp);
+    g.mode(PullUp);
+    b.mode(PullUp);
+
+    // Use internal pullups for pushbutton
+    pb1.mode(PullUp);
+    pb2.mode(PullUp);
+    // Delay for initial pullup to take effect
+    wait(.01);
+    // Setup Interrupt callback functions for a pb hit
+    pb1.attach_deasserted(&pb1_hit_callback);
+    pb2.attach_deasserted(&pb2_hit_callback);
+    // Start sampling pb inputs using interrupts
+    pb1.setSampleFrequency();
+    pb2.setSampleFrequency();
+
+    while(1) {
+        myRGBled.write(!r*pwm,!g*pwm,!b*pwm);
+    }
+}