University of Plymouth - Stages 1, 2 and 3
/
Task330_blocking
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Task330_blocking
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University of Plymouth - Stages 1, 2 and 3
main.cpp@5:a9a9d3b7f62a, 2017-10-24 (annotated)
- Committer:
- noutram
- Date:
- Tue Oct 24 13:27:27 2017 +0000
- Revision:
- 5:a9a9d3b7f62a
- Parent:
- 4:e71c1e3bc4a6
- Child:
- 6:2050203fd22b
for students
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| noutram | 0:397b84c74d17 | 1 | #include "mbed.h" |
| noutram | 0:397b84c74d17 | 2 | #define N 1000000 |
| noutram | 0:397b84c74d17 | 3 | #define RELEASED 0 |
| noutram | 0:397b84c74d17 | 4 | #define PRESSED 1 |
| noutram | 0:397b84c74d17 | 5 | |
| noutram | 0:397b84c74d17 | 6 | //Hardware objects |
| noutram | 0:397b84c74d17 | 7 | DigitalOut red_led(PE_15); //CountUp is in its critical section |
| noutram | 0:397b84c74d17 | 8 | DigitalOut yellow_led(PB_10); //CountDown is in its critical section |
| noutram | 0:397b84c74d17 | 9 | DigitalOut green_led(PB_11); //counter != 0 |
| noutram | 0:397b84c74d17 | 10 | DigitalOut onboardLED(LED1); |
| noutram | 0:397b84c74d17 | 11 | |
| noutram | 0:397b84c74d17 | 12 | DigitalIn button(USER_BUTTON); |
| noutram | 0:397b84c74d17 | 13 | DigitalIn sw1(PE_12); |
| noutram | 0:397b84c74d17 | 14 | DigitalIn sw2(PE_14); |
| noutram | 0:397b84c74d17 | 15 | |
| noutram | 2:ca251bdda621 | 16 | //The code below is hugely flawed and is only to |
| noutram | 2:ca251bdda621 | 17 | //illustrate the problem of blocking hardware |
| noutram | 0:397b84c74d17 | 18 | int main() { |
| noutram | 0:397b84c74d17 | 19 | |
| noutram | 2:ca251bdda621 | 20 | //Light up |
| noutram | 2:ca251bdda621 | 21 | red_led = 1; |
| noutram | 0:397b84c74d17 | 22 | yellow_led = 1; |
| noutram | 2:ca251bdda621 | 23 | green_led = 1; |
| noutram | 2:ca251bdda621 | 24 | onboardLED = 1; |
| noutram | 2:ca251bdda621 | 25 | |
| noutram | 0:397b84c74d17 | 26 | //Now loop forever |
| noutram | 0:397b84c74d17 | 27 | while(1) { |
| noutram | 3:a39db8aa11e8 | 28 | |
| noutram | 3:a39db8aa11e8 | 29 | while (sw1 == RELEASED) {}; |
| noutram | 3:a39db8aa11e8 | 30 | wait(0.2); |
| noutram | 3:a39db8aa11e8 | 31 | while (sw1 == PRESSED) {}; |
| noutram | 3:a39db8aa11e8 | 32 | red_led = !red_led; |
| noutram | 3:a39db8aa11e8 | 33 | wait(0.2); |
| noutram | 2:ca251bdda621 | 34 | |
| noutram | 3:a39db8aa11e8 | 35 | while (sw2 == RELEASED) {}; |
| noutram | 3:a39db8aa11e8 | 36 | wait(0.2); |
| noutram | 3:a39db8aa11e8 | 37 | while (sw2 == PRESSED) {}; |
| noutram | 3:a39db8aa11e8 | 38 | green_led = !green_led; |
| noutram | 3:a39db8aa11e8 | 39 | wait(0.2); |
| noutram | 3:a39db8aa11e8 | 40 | |
| noutram | 2:ca251bdda621 | 41 | //Flash the yellow |
| noutram | 2:ca251bdda621 | 42 | yellow_led = !yellow_led; |
| noutram | 2:ca251bdda621 | 43 | wait(0.5); |
| noutram | 0:397b84c74d17 | 44 | }; |
| noutram | 0:397b84c74d17 | 45 | } |
| noutram | 0:397b84c74d17 | 46 |