Demonstration of EventQueues
Dependencies: ELEC350-Practicals-FZ429
Fork of Task622Solution-mbedos54 by
main.cpp@10:3ab2495f24d9, 2017-11-20 (annotated)
- Committer:
- noutram
- Date:
- Mon Nov 20 10:51:32 2017 +0000
- Revision:
- 10:3ab2495f24d9
- Parent:
- 9:c46e831f8e4a
- Child:
- 11:67cb33bc247e
Initial demo of EventQueues
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
noutram | 0:f916cefba2f4 | 1 | #include "mbed.h" |
noutram | 10:3ab2495f24d9 | 2 | #include <iostream> |
noutram | 10:3ab2495f24d9 | 3 | #include "sample_hardware.hpp" |
noutram | 10:3ab2495f24d9 | 4 | #include "mbed_events.h" |
noutram | 10:3ab2495f24d9 | 5 | void buttonPressedISR(); |
noutram | 10:3ab2495f24d9 | 6 | void addSample(float t); |
noutram | 10:3ab2495f24d9 | 7 | void heartBeat(); |
noutram | 10:3ab2495f24d9 | 8 | |
noutram | 10:3ab2495f24d9 | 9 | DigitalOut led(LED1); |
noutram | 10:3ab2495f24d9 | 10 | InterruptIn btn(USER_BUTTON); |
noutram | 8:b28defacd894 | 11 | |
noutram | 10:3ab2495f24d9 | 12 | //Creates a queue with the default size |
noutram | 10:3ab2495f24d9 | 13 | EventQueue mainQueue(20); |
noutram | 0:f916cefba2f4 | 14 | |
noutram | 10:3ab2495f24d9 | 15 | Timer tmr1; |
noutram | 10:3ab2495f24d9 | 16 | Thread t1; |
noutram | 0:f916cefba2f4 | 17 | |
noutram | 10:3ab2495f24d9 | 18 | //Buffer |
noutram | 10:3ab2495f24d9 | 19 | float arrayOfTimes[10]; |
noutram | 8:b28defacd894 | 20 | |
noutram | 10:3ab2495f24d9 | 21 | int main() { |
noutram | 10:3ab2495f24d9 | 22 | //Power on self test |
noutram | 10:3ab2495f24d9 | 23 | post(); |
noutram | 10:3ab2495f24d9 | 24 | |
noutram | 10:3ab2495f24d9 | 25 | //Set up ISR |
noutram | 10:3ab2495f24d9 | 26 | btn.fall(buttonPressedISR); |
noutram | 10:3ab2495f24d9 | 27 | |
noutram | 10:3ab2495f24d9 | 28 | //Start timer |
noutram | 10:3ab2495f24d9 | 29 | tmr1.start(); |
noutram | 10:3ab2495f24d9 | 30 | |
noutram | 10:3ab2495f24d9 | 31 | //Background flash (backed by a Ticker) |
noutram | 10:3ab2495f24d9 | 32 | mainQueue.call_every(500, heartBeat); |
noutram | 10:3ab2495f24d9 | 33 | |
noutram | 10:3ab2495f24d9 | 34 | // events are executed by the dispatch method |
noutram | 10:3ab2495f24d9 | 35 | mainQueue.dispatch(); |
noutram | 10:3ab2495f24d9 | 36 | |
noutram | 10:3ab2495f24d9 | 37 | //Unreachable code |
noutram | 10:3ab2495f24d9 | 38 | printf("This should never appear!\n"); |
noutram | 8:b28defacd894 | 39 | } |
noutram | 8:b28defacd894 | 40 | |
noutram | 10:3ab2495f24d9 | 41 | void buttonPressedISR() { |
noutram | 10:3ab2495f24d9 | 42 | float t = tmr1.read(); //Immediately read time in seconds |
noutram | 10:3ab2495f24d9 | 43 | mainQueue.call(addSample, t); |
noutram | 0:f916cefba2f4 | 44 | } |
noutram | 0:f916cefba2f4 | 45 | |
noutram | 10:3ab2495f24d9 | 46 | // Add sample to buffer |
noutram | 10:3ab2495f24d9 | 47 | // Single parameter t, copy of latest switch time |
noutram | 10:3ab2495f24d9 | 48 | void addSample(float t) { |
noutram | 10:3ab2495f24d9 | 49 | |
noutram | 10:3ab2495f24d9 | 50 | //Manually shuffle the buffer |
noutram | 10:3ab2495f24d9 | 51 | for (unsigned int n=9; n>0; n--) { |
noutram | 10:3ab2495f24d9 | 52 | arrayOfTimes[n] = arrayOfTimes[n-1]; |
noutram | 10:3ab2495f24d9 | 53 | } |
noutram | 7:cd015e83995a | 54 | |
noutram | 10:3ab2495f24d9 | 55 | //Add new sample |
noutram | 10:3ab2495f24d9 | 56 | arrayOfTimes[0] = t; |
noutram | 10:3ab2495f24d9 | 57 | |
noutram | 10:3ab2495f24d9 | 58 | //Display deltas |
noutram | 10:3ab2495f24d9 | 59 | for (unsigned int n=9; n>0; n--) { |
noutram | 10:3ab2495f24d9 | 60 | float delta = (arrayOfTimes[n] - arrayOfTimes[n-1]); |
noutram | 10:3ab2495f24d9 | 61 | printf("%5.1f ", delta); |
noutram | 0:f916cefba2f4 | 62 | } |
noutram | 10:3ab2495f24d9 | 63 | printf("\n"); |
noutram | 0:f916cefba2f4 | 64 | } |
noutram | 2:70084af839d3 | 65 | |
noutram | 10:3ab2495f24d9 | 66 | //Flashing LED |
noutram | 10:3ab2495f24d9 | 67 | void heartBeat() { |
noutram | 10:3ab2495f24d9 | 68 | led = !led; |
noutram | 10:3ab2495f24d9 | 69 | } |