University of Plymouth - Stages 1, 2 and 3
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Task135Solution
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Task135Solution
by 
Nicholas Outram
main.cpp@2:a151e7fd279a, 2019-09-11 (annotated)
- Committer:
- noutram
- Date:
- Wed Sep 11 13:29:03 2019 +0000
- Revision:
- 2:a151e7fd279a
- Parent:
- 0:9333cd80614f
2019
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| noutram | 0:9333cd80614f | 1 | //This is known as a “header file” |
| noutram | 0:9333cd80614f | 2 | //In short, this copies and pastes the text file |
| noutram | 0:9333cd80614f | 3 | //mbed.h into this code |
| noutram | 0:9333cd80614f | 4 | #include "mbed.h" |
| noutram | 0:9333cd80614f | 5 | |
| noutram | 0:9333cd80614f | 6 | #define kRED 1 |
| noutram | 0:9333cd80614f | 7 | #define kYELLOW 2 |
| noutram | 0:9333cd80614f | 8 | #define kGREEN 4 |
| noutram | 0:9333cd80614f | 9 | |
| noutram | 0:9333cd80614f | 10 | BusOut binaryOutput(D7, D6, D5); //Outputs as an integer |
| noutram | 0:9333cd80614f | 11 | |
| noutram | 0:9333cd80614f | 12 | unsigned int state = 0; |
| noutram | 0:9333cd80614f | 13 | void toggleYellow() |
| noutram | 0:9333cd80614f | 14 | { |
| noutram | 0:9333cd80614f | 15 | if (state == 0) { |
| noutram | 0:9333cd80614f | 16 | binaryOutput = kYELLOW; |
| noutram | 0:9333cd80614f | 17 | state = 1; |
| noutram | 0:9333cd80614f | 18 | } else { |
| noutram | 0:9333cd80614f | 19 | binaryOutput = 0; |
| noutram | 0:9333cd80614f | 20 | state = 0; |
| noutram | 0:9333cd80614f | 21 | } |
| noutram | 0:9333cd80614f | 22 | } |
| noutram | 0:9333cd80614f | 23 | |
| noutram | 0:9333cd80614f | 24 | //The main function - all executable C / C++ |
| noutram | 0:9333cd80614f | 25 | //applications have a main function. This is |
| noutram | 0:9333cd80614f | 26 | //out entry point in the software |
| noutram | 0:9333cd80614f | 27 | Ticker T; |
| noutram | 0:9333cd80614f | 28 | |
| noutram | 0:9333cd80614f | 29 | int main() { |
| noutram | 0:9333cd80614f | 30 | |
| noutram | 0:9333cd80614f | 31 | binaryOutput = 0; |
| noutram | 0:9333cd80614f | 32 | |
| noutram | 0:9333cd80614f | 33 | // ALL the code is contained in a |
| noutram | 0:9333cd80614f | 34 | // “while loop" |
| noutram | 0:9333cd80614f | 35 | |
| noutram | 0:9333cd80614f | 36 | // THIS IS NOT AN IDEAL SOLUTION. HOWEVER IT IS SIMPLE |
| noutram | 0:9333cd80614f | 37 | |
| noutram | 0:9333cd80614f | 38 | |
| noutram | 0:9333cd80614f | 39 | while(1) |
| noutram | 0:9333cd80614f | 40 | { |
| noutram | 0:9333cd80614f | 41 | //The code between the { curly braces } |
| noutram | 0:9333cd80614f | 42 | //is the code that is repeated |
| noutram | 0:9333cd80614f | 43 | |
| noutram | 0:9333cd80614f | 44 | //STATE 1 (R) |
| noutram | 0:9333cd80614f | 45 | binaryOutput = kRED; |
| noutram | 0:9333cd80614f | 46 | wait(4.0); |
| noutram | 0:9333cd80614f | 47 | |
| noutram | 0:9333cd80614f | 48 | //STATE 2 (RA) |
| noutram | 0:9333cd80614f | 49 | binaryOutput = kRED + kYELLOW; |
| noutram | 0:9333cd80614f | 50 | wait(4.0); |
| noutram | 0:9333cd80614f | 51 | |
| noutram | 0:9333cd80614f | 52 | //STATE 3 (G) |
| noutram | 0:9333cd80614f | 53 | binaryOutput = kGREEN; |
| noutram | 0:9333cd80614f | 54 | wait(4.0); |
| noutram | 0:9333cd80614f | 55 | |
| noutram | 0:9333cd80614f | 56 | //STATE 4 (Flashing A) |
| noutram | 0:9333cd80614f | 57 | T.attach(toggleYellow, 0.25); |
| noutram | 0:9333cd80614f | 58 | wait(4.0); |
| noutram | 0:9333cd80614f | 59 | T.detach(); |
| noutram | 0:9333cd80614f | 60 | |
| noutram | 0:9333cd80614f | 61 | } |
| noutram | 0:9333cd80614f | 62 | } |