Peiling Yi / Mbed OS TSI_week5_01

Lab5-1

Dependencies:   TSI

Fork of TSI_sample by William Marsh

main.cpp@1:e6ffa08ad8bf, 2017-02-15 (annotated)

Committer:
WilliamMarshQMUL
Date:
Wed Feb 15 14:41:10 2017 +0000
Revision:
1:e6ffa08ad8bf
Parent:
0:4374caa1ef17
Child:
4:d54e74fbf82c
Added comment about polling rate

Who changed what in which revision?

UserRevisionLine numberNew contents of line
WilliamMarshQMUL 0:4374caa1ef17 1 #include "mbed.h"
WilliamMarshQMUL 0:4374caa1ef17 2 #include "rtos.h"
WilliamMarshQMUL 0:4374caa1ef17 3 #include "TSISensor.h"
WilliamMarshQMUL 0:4374caa1ef17 4
WilliamMarshQMUL 0:4374caa1ef17 5 // Example program for lab 5
WilliamMarshQMUL 0:4374caa1ef17 6 // -------------------------
WilliamMarshQMUL 0:4374caa1ef17 7 // A value is read from the touch sensor and use
WilliamMarshQMUL 0:4374caa1ef17 8 // to control two LEDs
WilliamMarshQMUL 0:4374caa1ef17 9 // The value is also output to the serial interface
WilliamMarshQMUL 0:4374caa1ef17 10
WilliamMarshQMUL 0:4374caa1ef17 11 Serial pc(USBTX, USBRX); // tx, rx
WilliamMarshQMUL 0:4374caa1ef17 12 DigitalOut redLED(LED_RED);
WilliamMarshQMUL 0:4374caa1ef17 13 DigitalOut greenLED(LED_GREEN);
WilliamMarshQMUL 0:4374caa1ef17 14 TSISensor tsi;
WilliamMarshQMUL 0:4374caa1ef17 15
WilliamMarshQMUL 0:4374caa1ef17 16 Thread redThread ; // thread for red LED
WilliamMarshQMUL 0:4374caa1ef17 17 Thread greenThread ; // thread for green LED
WilliamMarshQMUL 0:4374caa1ef17 18
WilliamMarshQMUL 0:4374caa1ef17 19 void red_thread() { // method to run in thread
WilliamMarshQMUL 0:4374caa1ef17 20 while (true) {
WilliamMarshQMUL 0:4374caa1ef17 21 Thread::signal_wait(0x1);
WilliamMarshQMUL 0:4374caa1ef17 22 redLED = false ; // turn on
WilliamMarshQMUL 0:4374caa1ef17 23 Thread::wait(5000);
WilliamMarshQMUL 0:4374caa1ef17 24 redLED = true ; // turn off
WilliamMarshQMUL 0:4374caa1ef17 25 redThread.signal_clr(0x1) ;
WilliamMarshQMUL 0:4374caa1ef17 26 // Signal are automatically cleared by wait_signal but
WilliamMarshQMUL 0:4374caa1ef17 27 // the signal might have been set again while LED on
WilliamMarshQMUL 0:4374caa1ef17 28 }
WilliamMarshQMUL 0:4374caa1ef17 29 }
WilliamMarshQMUL 0:4374caa1ef17 30
WilliamMarshQMUL 0:4374caa1ef17 31 void green_thread() { // method to run in thread
WilliamMarshQMUL 0:4374caa1ef17 32 while (true) {
WilliamMarshQMUL 0:4374caa1ef17 33 Thread::signal_wait(0x1);
WilliamMarshQMUL 0:4374caa1ef17 34 greenLED = false ; // turn on
WilliamMarshQMUL 0:4374caa1ef17 35 Thread::wait(5000);
WilliamMarshQMUL 0:4374caa1ef17 36 greenLED = true ; // turn off
WilliamMarshQMUL 0:4374caa1ef17 37 greenThread.signal_clr(0x1) ;
WilliamMarshQMUL 0:4374caa1ef17 38 // Signal are automatically cleared by wait_signal but
WilliamMarshQMUL 0:4374caa1ef17 39 // the signal might have been set again while LED on
WilliamMarshQMUL 0:4374caa1ef17 40 }
WilliamMarshQMUL 0:4374caa1ef17 41 }
WilliamMarshQMUL 0:4374caa1ef17 42
WilliamMarshQMUL 0:4374caa1ef17 43 int main(void) {
WilliamMarshQMUL 0:4374caa1ef17 44 redLED = true ; // turn off
WilliamMarshQMUL 0:4374caa1ef17 45 greenLED = true ; // turn off
WilliamMarshQMUL 0:4374caa1ef17 46 redThread.start(&red_thread) ; // start the red thread
WilliamMarshQMUL 0:4374caa1ef17 47 greenThread.start(&green_thread) ; // start the green thread
WilliamMarshQMUL 0:4374caa1ef17 48
WilliamMarshQMUL 0:4374caa1ef17 49 while (true) {
WilliamMarshQMUL 0:4374caa1ef17 50 uint8_t d = tsi.readDistance() ; // Distance is between 0 and 39
WilliamMarshQMUL 0:4374caa1ef17 51 // When no touch --> 0
WilliamMarshQMUL 0:4374caa1ef17 52 // Left --> low value Right --> high value
WilliamMarshQMUL 0:4374caa1ef17 53 pc.printf("%d", d) ;
WilliamMarshQMUL 1:e6ffa08ad8bf 54 pc.putc(' ') ;
WilliamMarshQMUL 0:4374caa1ef17 55 if (d == 10) redThread.signal_set(0x1) ;
WilliamMarshQMUL 0:4374caa1ef17 56 if (d == 20) greenThread.signal_set(0x1) ;
WilliamMarshQMUL 1:e6ffa08ad8bf 57 Thread::wait(200); // This polling rate is too slow - increase it
WilliamMarshQMUL 1:e6ffa08ad8bf 58 // The slower rate maks it easier to output on the terminal
WilliamMarshQMUL 0:4374caa1ef17 59 }
WilliamMarshQMUL 0:4374caa1ef17 60 }