Task 3.4.2
main.cpp@1:965090fe87b9, 2017-07-13 (annotated)
- Committer:
- noutram
- Date:
- Thu Jul 13 14:50:24 2017 +0000
- Revision:
- 1:965090fe87b9
- Parent:
- 0:62df7f96de34
updated for mbed-os 5.5
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| noutram | 0:62df7f96de34 | 1 | #include "mbed.h" |
| noutram | 0:62df7f96de34 | 2 | |
| noutram | 0:62df7f96de34 | 3 | //Global objects |
| noutram | 0:62df7f96de34 | 4 | BusOut binaryOutput(D5, D6, D7); |
| noutram | 0:62df7f96de34 | 5 | DigitalIn SW1(D4); |
| noutram | 0:62df7f96de34 | 6 | |
| noutram | 0:62df7f96de34 | 7 | //Function prototypes |
| noutram | 0:62df7f96de34 | 8 | void waitForButtonPress(); |
| noutram | 0:62df7f96de34 | 9 | |
| noutram | 0:62df7f96de34 | 10 | //Main function |
| noutram | 0:62df7f96de34 | 11 | int main() { |
| noutram | 0:62df7f96de34 | 12 | |
| noutram | 0:62df7f96de34 | 13 | //Create a variable to hold the bit pattern |
| noutram | 0:62df7f96de34 | 14 | unsigned int u; |
| noutram | 0:62df7f96de34 | 15 | |
| noutram | 0:62df7f96de34 | 16 | //Flash LED's to indicate the code is running |
| noutram | 0:62df7f96de34 | 17 | binaryOutput = 7; |
| noutram | 0:62df7f96de34 | 18 | wait(0.5); |
| noutram | 0:62df7f96de34 | 19 | binaryOutput = 0; |
| noutram | 0:62df7f96de34 | 20 | |
| noutram | 0:62df7f96de34 | 21 | while(1) { |
| noutram | 0:62df7f96de34 | 22 | |
| noutram | 0:62df7f96de34 | 23 | u = 7; //Set initial value 111 |
| noutram | 0:62df7f96de34 | 24 | binaryOutput = u; //Show binary on LED's |
| noutram | 0:62df7f96de34 | 25 | waitForButtonPress(); //Call function |
| noutram | 0:62df7f96de34 | 26 | |
| noutram | 0:62df7f96de34 | 27 | //Use & to reset bit 1 |
| noutram | 0:62df7f96de34 | 28 | u = u & 5; //AND with binary 101 |
| noutram | 0:62df7f96de34 | 29 | binaryOutput = u; |
| noutram | 0:62df7f96de34 | 30 | waitForButtonPress(); |
| noutram | 0:62df7f96de34 | 31 | |
| noutram | 0:62df7f96de34 | 32 | //Modify u with & to reset bit 2 to a 0 |
| noutram | 0:62df7f96de34 | 33 | //WRITE CODE HERE |
| noutram | 0:62df7f96de34 | 34 | binaryOutput = u; |
| noutram | 0:62df7f96de34 | 35 | waitForButtonPress(); |
| noutram | 0:62df7f96de34 | 36 | |
| noutram | 0:62df7f96de34 | 37 | |
| noutram | 0:62df7f96de34 | 38 | //Modify u with & to reset bit 0 to a 0 |
| noutram | 0:62df7f96de34 | 39 | //WRITE CODE HERE |
| noutram | 0:62df7f96de34 | 40 | binaryOutput = u; |
| noutram | 0:62df7f96de34 | 41 | waitForButtonPress(); |
| noutram | 0:62df7f96de34 | 42 | |
| noutram | 0:62df7f96de34 | 43 | } //end while(1) |
| noutram | 0:62df7f96de34 | 44 | } //end main |
| noutram | 0:62df7f96de34 | 45 | |
| noutram | 0:62df7f96de34 | 46 | |
| noutram | 0:62df7f96de34 | 47 | void waitForButtonPress() { |
| noutram | 0:62df7f96de34 | 48 | while (SW1 == 0); |
| noutram | 0:62df7f96de34 | 49 | wait(0.25); |
| noutram | 0:62df7f96de34 | 50 | while (SW1 == 1); |
| noutram | 0:62df7f96de34 | 51 | } |