Diff: main.cpp

Revision:

0:d04469a1b180

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 06 00:20:37 2019 +0000
@@ -0,0 +1,48 @@
+#include "mbed.h"
+
+Timeout timer;
+DigitalOut my_led(LED1);
+DigitalOut my_pwm(D10); // IO used by pwm_io function
+
+int on_delay = 0;
+int off_delay = 0;
+
+void toggleOff(void);
+
+void toggleOn(void) {
+    my_pwm = 1;
+    timer.attach_us(toggleOff, on_delay);
+}
+
+void toggleOff(void) {
+    my_pwm = 0;
+    timer.attach_us(toggleOn, off_delay);
+}
+
+// p_us = signal period in micro_seconds
+// dc   = signal duty-cycle (0.0 to 1.0)
+void pwm_io(int p_us, float dc) {
+    timer.detach();
+    if ((p_us == 0) || (dc == 0)) {
+        my_pwm = 0;
+        return;
+    }
+    if (dc >= 1) {
+        my_pwm = 1;
+        return;
+    }
+    on_delay = (int)(p_us * dc);
+    off_delay = p_us - on_delay;
+    toggleOn();
+}
+
+int main() {
+    
+    pwm_io(20000, 0.25); // 20ms - 25%
+    
+    while(1) {
+        my_led = !my_led;
+        wait(0.5);
+    }
+}
+ 
\ No newline at end of file