Diff: main.cpp

Revision:

0:4087d19c8e7b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Sep 06 12:42:09 2019 +0000
@@ -0,0 +1,90 @@
+#include "mbed.h"
+//LED effects demo using RTOS, threads, and built-in LEDs
+// info at https://os.mbed.com/users/4180_1/notebook/led-lighting-effects-for-modelers/
+// NOTE: waits will take too long unless firmware is upgraded on LPC1768 board
+// See https://os.mbed.com/handbook/Firmware-LPC1768-LPC11U24
+Thread thread1, thread2, thread3;
+DigitalOut myled(LED1);
+PwmOut myled2(LED2);
+PwmOut myled3(LED3);
+PwmOut myled4(LED4);
+
+inline float random_number()
+{
+    return (rand()/(float(RAND_MAX)));
+}
+
+void beacon()
+{
+    while(1) {
+        //LED warm up effect using PWM
+        for(int i=0; i<50; i++) {
+            myled2 = i/50.0;
+            wait(0.02);
+        }
+        //LED at full brightness level
+        myled2 = 1.0;
+        wait(0.25);
+        //LED cool down effect using PWM
+        for(int i=49; i>0; i--) {
+            myled2 = i/50.0;
+            wait(0.02);
+        }
+        //LED off
+        myled2 = 0.0;
+        wait(1.5);
+    }
+}
+void welding()
+{
+    float x = 0.0;
+
+    while(1) {
+        //get a new random number for PWM
+        x = random_number();
+        //add some exponential brightness scaling
+        //for more of a fast flash effect
+        myled3 = x*x*x;
+        //fast update rate for welding flashes
+        wait(0.02);
+        //add a random pause between welds
+        if (random_number()>0.9925) {
+            myled3 = 0.0;
+            wait(4.0*random_number());
+        }
+    }
+}
+
+void lighthouse()
+{
+    float y=0.0;
+
+    while(1) {
+        for(double x=0.0; x <= 3.14159; x = x + 0.0314159) {
+            y = sin(x); //nice periodic function 0..1..0
+            myled4 = y*y*y;//exponential effect - needs a sharp peak
+            wait(.025);
+        }
+        myled4 = 0.0;
+        //most lighthouses have a 5 second delay - so add another 2.5
+        wait(2.5);
+    }
+}
+
+int main()
+{
+    myled2.period(1.0/10000.0);
+    myled3.period(1.0/10000.0);
+    myled4.period(1.0/10000.0);
+    sleep_manager_lock_deep_sleep(); //lock out all 10ms deep sleep delays
+    thread1.start(callback(beacon));
+    thread2.start(callback(welding));
+    thread3.start(callback(lighthouse));
+    //main runs standard LED blink demo
+    while(1) {
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(0.2);
+    }
+}