Sebastian Barrera / Mbed OS Lab5_part1

Part 1

Dependencies:   TSI

main.cpp@6:71ef35e456ab, 2020-02-20 (annotated)

Committer:
WilliamMarshQMUL
Date:
Thu Feb 20 11:28:36 2020 +0000
Revision:
6:71ef35e456ab
Parent:
5:2a9a3d74a1d8
Child:
7:002686a28225
Update RTOS and use sleep_for

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WilliamMarshQMUL 0:4374caa1ef17 1 #include "mbed.h"
WilliamMarshQMUL 0:4374caa1ef17 2 #include "TSISensor.h"
WilliamMarshQMUL 0:4374caa1ef17 3
WilliamMarshQMUL 0:4374caa1ef17 4 // Example program for lab 5
WilliamMarshQMUL 0:4374caa1ef17 5 // -------------------------
WilliamMarshQMUL 0:4374caa1ef17 6 // A value is read from the touch sensor and use
WilliamMarshQMUL 0:4374caa1ef17 7 // to control two LEDs
WilliamMarshQMUL 0:4374caa1ef17 8 // The value is also output to the serial interface
WilliamMarshQMUL 0:4374caa1ef17 9
WilliamMarshQMUL 0:4374caa1ef17 10 Serial pc(USBTX, USBRX); // tx, rx
WilliamMarshQMUL 0:4374caa1ef17 11 DigitalOut redLED(LED_RED);
WilliamMarshQMUL 0:4374caa1ef17 12 DigitalOut greenLED(LED_GREEN);
WilliamMarshQMUL 0:4374caa1ef17 13 TSISensor tsi;
WilliamMarshQMUL 0:4374caa1ef17 14
WilliamMarshQMUL 0:4374caa1ef17 15 Thread redThread ; // thread for red LED
WilliamMarshQMUL 0:4374caa1ef17 16 Thread greenThread ; // thread for green LED
WilliamMarshQMUL 5:2a9a3d74a1d8 17
WilliamMarshQMUL 5:2a9a3d74a1d8 18 # define REDFLAG 0x01
WilliamMarshQMUL 5:2a9a3d74a1d8 19 # define GREENFLAG 0x02
WilliamMarshQMUL 5:2a9a3d74a1d8 20 EventFlags signals; // event flags for signalling; 2 used
WilliamMarshQMUL 0:4374caa1ef17 21
WilliamMarshQMUL 0:4374caa1ef17 22 void red_thread() { // method to run in thread
WilliamMarshQMUL 0:4374caa1ef17 23 while (true) {
WilliamMarshQMUL 5:2a9a3d74a1d8 24 signals.wait_any(REDFLAG);
WilliamMarshQMUL 5:2a9a3d74a1d8 25 redLED = false ; // turn on
WilliamMarshQMUL 6:71ef35e456ab 26 ThisThread::sleep_for(5000) ; // wait(5.0);
WilliamMarshQMUL 0:4374caa1ef17 27 redLED = true ; // turn off
WilliamMarshQMUL 5:2a9a3d74a1d8 28 signals.clear(REDFLAG) ;
WilliamMarshQMUL 5:2a9a3d74a1d8 29 // Signal are automatically cleared by wait_any but
WilliamMarshQMUL 0:4374caa1ef17 30 // the signal might have been set again while LED on
WilliamMarshQMUL 0:4374caa1ef17 31 }
WilliamMarshQMUL 0:4374caa1ef17 32 }
WilliamMarshQMUL 0:4374caa1ef17 33
WilliamMarshQMUL 0:4374caa1ef17 34 void green_thread() { // method to run in thread
WilliamMarshQMUL 0:4374caa1ef17 35 while (true) {
WilliamMarshQMUL 5:2a9a3d74a1d8 36 signals.wait_any(GREENFLAG);
WilliamMarshQMUL 0:4374caa1ef17 37 greenLED = false ; // turn on
WilliamMarshQMUL 6:71ef35e456ab 38 ThisThread::sleep_for(5000) ; // wait(5.0);
WilliamMarshQMUL 0:4374caa1ef17 39 greenLED = true ; // turn off
WilliamMarshQMUL 5:2a9a3d74a1d8 40 signals.clear(GREENFLAG) ;
WilliamMarshQMUL 5:2a9a3d74a1d8 41 // Signal are automatically cleared by wait_any but
WilliamMarshQMUL 0:4374caa1ef17 42 // the signal might have been set again while LED on
WilliamMarshQMUL 0:4374caa1ef17 43 }
WilliamMarshQMUL 0:4374caa1ef17 44 }
WilliamMarshQMUL 0:4374caa1ef17 45
WilliamMarshQMUL 0:4374caa1ef17 46 int main(void) {
WilliamMarshQMUL 0:4374caa1ef17 47 redLED = true ; // turn off
WilliamMarshQMUL 0:4374caa1ef17 48 greenLED = true ; // turn off
WilliamMarshQMUL 5:2a9a3d74a1d8 49 redThread.start(red_thread) ; // start the red thread
WilliamMarshQMUL 5:2a9a3d74a1d8 50 greenThread.start(green_thread) ; // start the green thread
WilliamMarshQMUL 0:4374caa1ef17 51
WilliamMarshQMUL 0:4374caa1ef17 52 while (true) {
WilliamMarshQMUL 0:4374caa1ef17 53 uint8_t d = tsi.readDistance() ; // Distance is between 0 and 39
WilliamMarshQMUL 0:4374caa1ef17 54 // When no touch --> 0
WilliamMarshQMUL 0:4374caa1ef17 55 // Left --> low value Right --> high value
WilliamMarshQMUL 0:4374caa1ef17 56 pc.printf("%d", d) ;
WilliamMarshQMUL 1:e6ffa08ad8bf 57 pc.putc(' ') ;
WilliamMarshQMUL 5:2a9a3d74a1d8 58 if (d == 10) signals.set(REDFLAG) ;
WilliamMarshQMUL 5:2a9a3d74a1d8 59 if (d == 20) signals.set(GREENFLAG) ;
WilliamMarshQMUL 6:71ef35e456ab 60 ThisThread::sleep_for(500) ; // This polling rate is too slow - increase it
WilliamMarshQMUL 5:2a9a3d74a1d8 61 // The slower rate maks it easier to output on the terminal
WilliamMarshQMUL 0:4374caa1ef17 62 }
WilliamMarshQMUL 0:4374caa1ef17 63 }