Stage-1 Students SoCEM / Mbed OS Task525Solution-FZ429

Updated for FZ429

main.cpp@2:07ab11686702, 2018-11-12 (annotated)

Committer:
noutram
Date:
Mon Nov 12 14:40:23 2018 +0000
Revision:
2:07ab11686702
Parent:
0:3506f73fe611 
Updated for FZ429

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:3506f73fe611 1 #include "mbed.h"
noutram 0:3506f73fe611 2
noutram 0:3506f73fe611 3 //Global PWM object
noutram 2:07ab11686702 4 PwmOut pwmRed(D6);
noutram 0:3506f73fe611 5
noutram 0:3506f73fe611 6 InterruptIn SWOn(D4); //Fade ON
noutram 0:3506f73fe611 7 InterruptIn SWOff(D3); //Fade OFF
noutram 0:3506f73fe611 8
noutram 0:3506f73fe611 9 int T = 100; //100uS
noutram 0:3506f73fe611 10 volatile int Tmark = 0; //0us
noutram 0:3506f73fe611 11 volatile int delta = 1; //1us
noutram 0:3506f73fe611 12
noutram 0:3506f73fe611 13 //Timer
noutram 0:3506f73fe611 14 Ticker t;
noutram 0:3506f73fe611 15
noutram 0:3506f73fe611 16 //Function prototype
noutram 0:3506f73fe611 17 void doTwinkle();
noutram 0:3506f73fe611 18 void doSwitchON();
noutram 0:3506f73fe611 19 void doSwitchOFF();
noutram 0:3506f73fe611 20
noutram 0:3506f73fe611 21 //Flags
noutram 0:3506f73fe611 22 volatile int switchONFlag=0;
noutram 0:3506f73fe611 23 volatile int switchOFFFlag=0;
noutram 0:3506f73fe611 24 volatile int tickerFlag = 0;
noutram 0:3506f73fe611 25
noutram 0:3506f73fe611 26 int main() {
noutram 0:3506f73fe611 27 //Setup switch interrupts
noutram 0:3506f73fe611 28 SWOn.rise(doSwitchON);
noutram 0:3506f73fe611 29 SWOff.rise(doSwitchOFF);
noutram 0:3506f73fe611 30
noutram 0:3506f73fe611 31 //Initial PWM state
noutram 0:3506f73fe611 32 pwmRed.period_us(T);
noutram 0:3506f73fe611 33 pwmRed.pulsewidth_us(Tmark);
noutram 0:3506f73fe611 34
noutram 0:3506f73fe611 35
noutram 0:3506f73fe611 36 printf("Ready\n");
noutram 0:3506f73fe611 37
noutram 0:3506f73fe611 38 while(1) {
noutram 0:3506f73fe611 39 sleep();
noutram 0:3506f73fe611 40
noutram 0:3506f73fe611 41 //Which interrupt occured?
noutram 0:3506f73fe611 42 if (switchONFlag == 1) {
noutram 0:3506f73fe611 43 switchONFlag = 0;
noutram 0:3506f73fe611 44 delta = 5;
noutram 0:3506f73fe611 45 t.attach(doTwinkle, 0.1);
noutram 0:3506f73fe611 46 printf("ON button pressed\n");
noutram 0:3506f73fe611 47 }
noutram 0:3506f73fe611 48 else if (switchOFFFlag == 1) {
noutram 0:3506f73fe611 49 switchOFFFlag = 0;
noutram 0:3506f73fe611 50 delta = -5;
noutram 0:3506f73fe611 51 t.attach(doTwinkle, 0.1);
noutram 0:3506f73fe611 52 printf("OFF button pressed\n");
noutram 0:3506f73fe611 53 }
noutram 0:3506f73fe611 54
noutram 0:3506f73fe611 55 //Has ticker hit the end stop?
noutram 0:3506f73fe611 56 if (tickerFlag == 1) {
noutram 0:3506f73fe611 57 tickerFlag = 0;
noutram 0:3506f73fe611 58 delta = 0; //Pedantic
noutram 0:3506f73fe611 59 t.detach(); //Turn off ticker
noutram 0:3506f73fe611 60 printf("Timer finished\n");
noutram 0:3506f73fe611 61 }
noutram 0:3506f73fe611 62 //Update PWM
noutram 0:3506f73fe611 63 pwmRed.pulsewidth_us(Tmark);
noutram 0:3506f73fe611 64
noutram 0:3506f73fe611 65 printf("Tmark = %d\n", Tmark); //Debug
noutram 0:3506f73fe611 66 }
noutram 0:3506f73fe611 67 }
noutram 0:3506f73fe611 68
noutram 0:3506f73fe611 69 void doSwitchON()
noutram 0:3506f73fe611 70 {
noutram 0:3506f73fe611 71 switchONFlag=1;
noutram 0:3506f73fe611 72 }
noutram 0:3506f73fe611 73
noutram 0:3506f73fe611 74 void doSwitchOFF()
noutram 0:3506f73fe611 75 {
noutram 0:3506f73fe611 76 switchOFFFlag=1;
noutram 0:3506f73fe611 77 }
noutram 0:3506f73fe611 78
noutram 0:3506f73fe611 79 //ISR for Timer
noutram 0:3506f73fe611 80 void doTwinkle()
noutram 0:3506f73fe611 81 {
noutram 0:3506f73fe611 82 //Add on delta
noutram 0:3506f73fe611 83 Tmark += delta;
noutram 0:3506f73fe611 84
noutram 0:3506f73fe611 85 //Cap at extremes
noutram 0:3506f73fe611 86 if (Tmark > 100) {
noutram 0:3506f73fe611 87 Tmark = 100;
noutram 0:3506f73fe611 88 }
noutram 0:3506f73fe611 89 else if (Tmark < 0) {
noutram 0:3506f73fe611 90 Tmark = 0;
noutram 0:3506f73fe611 91 }
noutram 0:3506f73fe611 92
noutram 0:3506f73fe611 93 //Check bounds
noutram 0:3506f73fe611 94 if ((Tmark == 100) || (Tmark == 0)) {
noutram 0:3506f73fe611 95 tickerFlag = 1;
noutram 0:3506f73fe611 96 }
noutram 0:3506f73fe611 97 }