Diff: main.cpp

Revision:

0:2c40be1aaaeb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 09 00:33:31 2018 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+#include "PinDetect.h"
+// must import Cookbook PinDetct library into project
+// URL: http://mbed.org/users/AjK/libraries/PinDetect/lkyxpw
+
+PwmOut myled(p23);
+
+PinDetect pb1(p8);
+PinDetect pb2(p7);
+// SPST Pushbutton debounced count demo using interrupts and callback
+// no external PullUp resistor needed
+// Pushbutton from P8 to GND.
+// Second Pushbutton from P7 to GND.
+// A pb hit generates an interrupt and activates the callback function
+// after the switch is debounced
+
+// 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()
+{
+
+    // 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) {
+        myled = pwm;
+    }
+
+}