LED effects demo for LPC1768 using version 5 RTOS Details at https://os.mbed.com/users/4180_1/notebook/led-lighting-effects-for-modelers/ - NOTE: Requires firmware update for proper wait times
main.cpp@0:4087d19c8e7b, 2019-09-06 (annotated)
- Committer:
- 4180_1
- Date:
- Fri Sep 06 12:42:09 2019 +0000
- Revision:
- 0:4087d19c8e7b
ver 1.0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
4180_1 | 0:4087d19c8e7b | 1 | #include "mbed.h" |
4180_1 | 0:4087d19c8e7b | 2 | //LED effects demo using RTOS, threads, and built-in LEDs |
4180_1 | 0:4087d19c8e7b | 3 | // info at https://os.mbed.com/users/4180_1/notebook/led-lighting-effects-for-modelers/ |
4180_1 | 0:4087d19c8e7b | 4 | // NOTE: waits will take too long unless firmware is upgraded on LPC1768 board |
4180_1 | 0:4087d19c8e7b | 5 | // See https://os.mbed.com/handbook/Firmware-LPC1768-LPC11U24 |
4180_1 | 0:4087d19c8e7b | 6 | Thread thread1, thread2, thread3; |
4180_1 | 0:4087d19c8e7b | 7 | DigitalOut myled(LED1); |
4180_1 | 0:4087d19c8e7b | 8 | PwmOut myled2(LED2); |
4180_1 | 0:4087d19c8e7b | 9 | PwmOut myled3(LED3); |
4180_1 | 0:4087d19c8e7b | 10 | PwmOut myled4(LED4); |
4180_1 | 0:4087d19c8e7b | 11 | |
4180_1 | 0:4087d19c8e7b | 12 | inline float random_number() |
4180_1 | 0:4087d19c8e7b | 13 | { |
4180_1 | 0:4087d19c8e7b | 14 | return (rand()/(float(RAND_MAX))); |
4180_1 | 0:4087d19c8e7b | 15 | } |
4180_1 | 0:4087d19c8e7b | 16 | |
4180_1 | 0:4087d19c8e7b | 17 | void beacon() |
4180_1 | 0:4087d19c8e7b | 18 | { |
4180_1 | 0:4087d19c8e7b | 19 | while(1) { |
4180_1 | 0:4087d19c8e7b | 20 | //LED warm up effect using PWM |
4180_1 | 0:4087d19c8e7b | 21 | for(int i=0; i<50; i++) { |
4180_1 | 0:4087d19c8e7b | 22 | myled2 = i/50.0; |
4180_1 | 0:4087d19c8e7b | 23 | wait(0.02); |
4180_1 | 0:4087d19c8e7b | 24 | } |
4180_1 | 0:4087d19c8e7b | 25 | //LED at full brightness level |
4180_1 | 0:4087d19c8e7b | 26 | myled2 = 1.0; |
4180_1 | 0:4087d19c8e7b | 27 | wait(0.25); |
4180_1 | 0:4087d19c8e7b | 28 | //LED cool down effect using PWM |
4180_1 | 0:4087d19c8e7b | 29 | for(int i=49; i>0; i--) { |
4180_1 | 0:4087d19c8e7b | 30 | myled2 = i/50.0; |
4180_1 | 0:4087d19c8e7b | 31 | wait(0.02); |
4180_1 | 0:4087d19c8e7b | 32 | } |
4180_1 | 0:4087d19c8e7b | 33 | //LED off |
4180_1 | 0:4087d19c8e7b | 34 | myled2 = 0.0; |
4180_1 | 0:4087d19c8e7b | 35 | wait(1.5); |
4180_1 | 0:4087d19c8e7b | 36 | } |
4180_1 | 0:4087d19c8e7b | 37 | } |
4180_1 | 0:4087d19c8e7b | 38 | void welding() |
4180_1 | 0:4087d19c8e7b | 39 | { |
4180_1 | 0:4087d19c8e7b | 40 | float x = 0.0; |
4180_1 | 0:4087d19c8e7b | 41 | |
4180_1 | 0:4087d19c8e7b | 42 | while(1) { |
4180_1 | 0:4087d19c8e7b | 43 | //get a new random number for PWM |
4180_1 | 0:4087d19c8e7b | 44 | x = random_number(); |
4180_1 | 0:4087d19c8e7b | 45 | //add some exponential brightness scaling |
4180_1 | 0:4087d19c8e7b | 46 | //for more of a fast flash effect |
4180_1 | 0:4087d19c8e7b | 47 | myled3 = x*x*x; |
4180_1 | 0:4087d19c8e7b | 48 | //fast update rate for welding flashes |
4180_1 | 0:4087d19c8e7b | 49 | wait(0.02); |
4180_1 | 0:4087d19c8e7b | 50 | //add a random pause between welds |
4180_1 | 0:4087d19c8e7b | 51 | if (random_number()>0.9925) { |
4180_1 | 0:4087d19c8e7b | 52 | myled3 = 0.0; |
4180_1 | 0:4087d19c8e7b | 53 | wait(4.0*random_number()); |
4180_1 | 0:4087d19c8e7b | 54 | } |
4180_1 | 0:4087d19c8e7b | 55 | } |
4180_1 | 0:4087d19c8e7b | 56 | } |
4180_1 | 0:4087d19c8e7b | 57 | |
4180_1 | 0:4087d19c8e7b | 58 | void lighthouse() |
4180_1 | 0:4087d19c8e7b | 59 | { |
4180_1 | 0:4087d19c8e7b | 60 | float y=0.0; |
4180_1 | 0:4087d19c8e7b | 61 | |
4180_1 | 0:4087d19c8e7b | 62 | while(1) { |
4180_1 | 0:4087d19c8e7b | 63 | for(double x=0.0; x <= 3.14159; x = x + 0.0314159) { |
4180_1 | 0:4087d19c8e7b | 64 | y = sin(x); //nice periodic function 0..1..0 |
4180_1 | 0:4087d19c8e7b | 65 | myled4 = y*y*y;//exponential effect - needs a sharp peak |
4180_1 | 0:4087d19c8e7b | 66 | wait(.025); |
4180_1 | 0:4087d19c8e7b | 67 | } |
4180_1 | 0:4087d19c8e7b | 68 | myled4 = 0.0; |
4180_1 | 0:4087d19c8e7b | 69 | //most lighthouses have a 5 second delay - so add another 2.5 |
4180_1 | 0:4087d19c8e7b | 70 | wait(2.5); |
4180_1 | 0:4087d19c8e7b | 71 | } |
4180_1 | 0:4087d19c8e7b | 72 | } |
4180_1 | 0:4087d19c8e7b | 73 | |
4180_1 | 0:4087d19c8e7b | 74 | int main() |
4180_1 | 0:4087d19c8e7b | 75 | { |
4180_1 | 0:4087d19c8e7b | 76 | myled2.period(1.0/10000.0); |
4180_1 | 0:4087d19c8e7b | 77 | myled3.period(1.0/10000.0); |
4180_1 | 0:4087d19c8e7b | 78 | myled4.period(1.0/10000.0); |
4180_1 | 0:4087d19c8e7b | 79 | sleep_manager_lock_deep_sleep(); //lock out all 10ms deep sleep delays |
4180_1 | 0:4087d19c8e7b | 80 | thread1.start(callback(beacon)); |
4180_1 | 0:4087d19c8e7b | 81 | thread2.start(callback(welding)); |
4180_1 | 0:4087d19c8e7b | 82 | thread3.start(callback(lighthouse)); |
4180_1 | 0:4087d19c8e7b | 83 | //main runs standard LED blink demo |
4180_1 | 0:4087d19c8e7b | 84 | while(1) { |
4180_1 | 0:4087d19c8e7b | 85 | myled = 1; |
4180_1 | 0:4087d19c8e7b | 86 | wait(0.2); |
4180_1 | 0:4087d19c8e7b | 87 | myled = 0; |
4180_1 | 0:4087d19c8e7b | 88 | wait(0.2); |
4180_1 | 0:4087d19c8e7b | 89 | } |
4180_1 | 0:4087d19c8e7b | 90 | } |