Oliver Ainhirn / Mbed OS 85_Event_State

erweitert um RGB LED

main.cpp@0:f0345f20337e, 2019-04-02 (annotated)

Committer:
corsa1600
Date:
Tue Apr 02 17:24:04 2019 +0000
Revision:
0:f0345f20337e
Child:
1:dc7c5869f9e1
mit RGB LED

Who changed what in which revision?

UserRevisionLine numberNew contents of line
corsa1600 0:f0345f20337e 1 #include "mbed.h"
corsa1600 0:f0345f20337e 2
corsa1600 0:f0345f20337e 3 DigitalOut led1(LED1);
corsa1600 0:f0345f20337e 4 DigitalOut led2(LED2);
corsa1600 0:f0345f20337e 5 DigitalOut led3(LED3);
corsa1600 0:f0345f20337e 6
corsa1600 0:f0345f20337e 7 DigitalOut red(p23);
corsa1600 0:f0345f20337e 8 DigitalOut green(p24);
corsa1600 0:f0345f20337e 9 DigitalOut blue(p25);
corsa1600 0:f0345f20337e 10
corsa1600 0:f0345f20337e 11 class StopLight {
corsa1600 0:f0345f20337e 12 private:
corsa1600 0:f0345f20337e 13 EventQueue _queue;
corsa1600 0:f0345f20337e 14 int _pending;
corsa1600 0:f0345f20337e 15
corsa1600 0:f0345f20337e 16 enum state { RED, GREEN, YELLOW };
corsa1600 0:f0345f20337e 17
corsa1600 0:f0345f20337e 18 // The _step function is a traditional FSM which enqueues transitions onto the event queue
corsa1600 0:f0345f20337e 19 void _step(state transition) {
corsa1600 0:f0345f20337e 20 switch (transition) {
corsa1600 0:f0345f20337e 21 case RED:
corsa1600 0:f0345f20337e 22 set_red();
corsa1600 0:f0345f20337e 23 _pending = _queue.call_in(1000, this, &StopLight::_step, GREEN);
corsa1600 0:f0345f20337e 24 break;
corsa1600 0:f0345f20337e 25
corsa1600 0:f0345f20337e 26 case GREEN:
corsa1600 0:f0345f20337e 27 set_green();
corsa1600 0:f0345f20337e 28 _pending = _queue.call_in(1000, this, &StopLight::_step, YELLOW);
corsa1600 0:f0345f20337e 29 break;
corsa1600 0:f0345f20337e 30
corsa1600 0:f0345f20337e 31 case YELLOW:
corsa1600 0:f0345f20337e 32 set_yellow();
corsa1600 0:f0345f20337e 33 _pending = _queue.call_in(500, this, &StopLight::_step, RED);
corsa1600 0:f0345f20337e 34 break;
corsa1600 0:f0345f20337e 35 }
corsa1600 0:f0345f20337e 36 }
corsa1600 0:f0345f20337e 37 void set_red(){
corsa1600 0:f0345f20337e 38 red = 0; green = 1; blue = 1;
corsa1600 0:f0345f20337e 39 }
corsa1600 0:f0345f20337e 40 void set_green(){
corsa1600 0:f0345f20337e 41 red = 1; green = 0; blue = 1;
corsa1600 0:f0345f20337e 42 }
corsa1600 0:f0345f20337e 43 void set_yellow() {
corsa1600 0:f0345f20337e 44 red = 0; green = 0; blue = 1;
corsa1600 0:f0345f20337e 45 }
corsa1600 0:f0345f20337e 46 public:
corsa1600 0:f0345f20337e 47 // The fire function can immediately change states in the FSM
corsa1600 0:f0345f20337e 48 void fire() {
corsa1600 0:f0345f20337e 49 _queue.cancel(_pending);
corsa1600 0:f0345f20337e 50 _queue.call(this, &StopLight::_step, GREEN);
corsa1600 0:f0345f20337e 51 _queue.dispatch();
corsa1600 0:f0345f20337e 52 }
corsa1600 0:f0345f20337e 53 };
corsa1600 0:f0345f20337e 54
corsa1600 0:f0345f20337e 55 StopLight sl;
corsa1600 0:f0345f20337e 56
corsa1600 0:f0345f20337e 57 int main (void) {
corsa1600 0:f0345f20337e 58 sl.fire();
corsa1600 0:f0345f20337e 59 wait(osWaitForever);
corsa1600 0:f0345f20337e 60 }