deni setiawan
/
digitalInInterrupt_sample
assessed Interupt
Fork of digitalInInterrupt_sample by
main.cpp@4:4caae521ff66, 2018-02-02 (annotated)
- Committer:
- dhenis
- Date:
- Fri Feb 02 21:44:55 2018 +0000
- Revision:
- 4:4caae521ff66
- Parent:
- 3:05b6a1431a6b
Interupt Assessed
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
WilliamMarshQMUL | 0:a66a8cb0012c | 1 | #include "mbed.h" |
WilliamMarshQMUL | 0:a66a8cb0012c | 2 | |
WilliamMarshQMUL | 1:13e0c1956b54 | 3 | // Labs 2: Example program for using an interrupt (or callback) |
WilliamMarshQMUL | 1:13e0c1956b54 | 4 | // ----------------------------------------------------------- |
dhenis | 4:4caae521ff66 | 5 | // A callback function (corresponding to an ISR) is called when a button |
WilliamMarshQMUL | 1:13e0c1956b54 | 6 | // is pressed |
WilliamMarshQMUL | 1:13e0c1956b54 | 7 | // The callback uses a shared variable to signal another thread |
WilliamMarshQMUL | 0:a66a8cb0012c | 8 | |
WilliamMarshQMUL | 1:13e0c1956b54 | 9 | InterruptIn button(PTD0); |
dhenis | 4:4caae521ff66 | 10 | |
dhenis | 4:4caae521ff66 | 11 | InterruptIn button2(PTD2); |
dhenis | 4:4caae521ff66 | 12 | DigitalOut led1(LED_RED); |
dhenis | 4:4caae521ff66 | 13 | DigitalOut led2(LED_BLUE); |
WilliamMarshQMUL | 0:a66a8cb0012c | 14 | |
dhenis | 4:4caae521ff66 | 15 | |
dhenis | 4:4caae521ff66 | 16 | volatile int pressEvent1 = 0 ; |
dhenis | 4:4caae521ff66 | 17 | |
dhenis | 4:4caae521ff66 | 18 | volatile int pressEvent2 = 0 ; |
WilliamMarshQMUL | 0:a66a8cb0012c | 19 | |
WilliamMarshQMUL | 3:05b6a1431a6b | 20 | // This function is invoked when then interrupt occurs |
WilliamMarshQMUL | 3:05b6a1431a6b | 21 | // Signal that the button has been pressed |
dhenis | 4:4caae521ff66 | 22 | // Note: bounce may occur |
dhenis | 4:4caae521ff66 | 23 | void buttonCallback1(){ |
dhenis | 4:4caae521ff66 | 24 | |
dhenis | 4:4caae521ff66 | 25 | |
dhenis | 4:4caae521ff66 | 26 | pressEvent1 = 1 ; |
dhenis | 4:4caae521ff66 | 27 | |
dhenis | 4:4caae521ff66 | 28 | |
WilliamMarshQMUL | 0:a66a8cb0012c | 29 | } |
dhenis | 4:4caae521ff66 | 30 | void buttonCallback2(){ |
dhenis | 4:4caae521ff66 | 31 | |
dhenis | 4:4caae521ff66 | 32 | pressEvent2 = 1 ; |
WilliamMarshQMUL | 0:a66a8cb0012c | 33 | |
dhenis | 4:4caae521ff66 | 34 | |
dhenis | 4:4caae521ff66 | 35 | } |
WilliamMarshQMUL | 3:05b6a1431a6b | 36 | /* ---- Main function (default thread) ---- |
WilliamMarshQMUL | 3:05b6a1431a6b | 37 | Note that if this thread completes, nothing else works |
WilliamMarshQMUL | 3:05b6a1431a6b | 38 | */ |
WilliamMarshQMUL | 3:05b6a1431a6b | 39 | int main() { |
WilliamMarshQMUL | 3:05b6a1431a6b | 40 | button.mode(PullUp); // Ensure button i/p has pull up |
dhenis | 4:4caae521ff66 | 41 | button.fall(&buttonCallback1) ; // Attach function to falling edge |
dhenis | 4:4caae521ff66 | 42 | |
dhenis | 4:4caae521ff66 | 43 | |
dhenis | 4:4caae521ff66 | 44 | button2.mode(PullUp); // Ensure button i/p has pull up |
dhenis | 4:4caae521ff66 | 45 | button2.fall(&buttonCallback2) ; // Attach function to falling edge |
dhenis | 4:4caae521ff66 | 46 | |
dhenis | 4:4caae521ff66 | 47 | bool flash1 = true; |
dhenis | 4:4caae521ff66 | 48 | |
dhenis | 4:4caae521ff66 | 49 | bool flash2 = true; |
dhenis | 4:4caae521ff66 | 50 | |
dhenis | 4:4caae521ff66 | 51 | |
dhenis | 4:4caae521ff66 | 52 | // bool cycle = false; // |
dhenis | 4:4caae521ff66 | 53 | |
dhenis | 4:4caae521ff66 | 54 | |
dhenis | 4:4caae521ff66 | 55 | bool check_flash1 = true; // check flash one ==> make flash 1 only change once in each cycle |
dhenis | 4:4caae521ff66 | 56 | |
dhenis | 4:4caae521ff66 | 57 | bool check_flash2 = true; // check flash one ==> make flash 1 only change once in each cycle |
WilliamMarshQMUL | 3:05b6a1431a6b | 58 | |
WilliamMarshQMUL | 0:a66a8cb0012c | 59 | while(true) { |
dhenis | 4:4caae521ff66 | 60 | |
dhenis | 4:4caae521ff66 | 61 | |
WilliamMarshQMUL | 3:05b6a1431a6b | 62 | // Toggle the LED every time the button is pressed |
dhenis | 4:4caae521ff66 | 63 | if (pressEvent1 and check_flash1) { |
dhenis | 4:4caae521ff66 | 64 | |
dhenis | 4:4caae521ff66 | 65 | // led1 = 1 ; //eend turn off light as default |
dhenis | 4:4caae521ff66 | 66 | flash1 = !flash1 ; |
dhenis | 4:4caae521ff66 | 67 | |
dhenis | 4:4caae521ff66 | 68 | pressEvent1 = 0 ; // Clear the event variable |
dhenis | 4:4caae521ff66 | 69 | |
dhenis | 4:4caae521ff66 | 70 | // dealing with bounce |
dhenis | 4:4caae521ff66 | 71 | check_flash1 = false; |
dhenis | 4:4caae521ff66 | 72 | |
dhenis | 4:4caae521ff66 | 73 | } |
dhenis | 4:4caae521ff66 | 74 | |
dhenis | 4:4caae521ff66 | 75 | // Toggle the LED every time the button is pressed |
dhenis | 4:4caae521ff66 | 76 | if (pressEvent2 and check_flash2) { |
dhenis | 4:4caae521ff66 | 77 | |
dhenis | 4:4caae521ff66 | 78 | //led2 = 1 ; //eend turn off light as default |
dhenis | 4:4caae521ff66 | 79 | flash2 = !flash2 ; |
dhenis | 4:4caae521ff66 | 80 | |
dhenis | 4:4caae521ff66 | 81 | pressEvent2 = 0 ; // Clear the event variable |
dhenis | 4:4caae521ff66 | 82 | |
dhenis | 4:4caae521ff66 | 83 | // dealing with bounce |
dhenis | 4:4caae521ff66 | 84 | check_flash2 = false; |
WilliamMarshQMUL | 0:a66a8cb0012c | 85 | } |
dhenis | 4:4caae521ff66 | 86 | |
dhenis | 4:4caae521ff66 | 87 | |
dhenis | 4:4caae521ff66 | 88 | if(flash1){ |
dhenis | 4:4caae521ff66 | 89 | |
dhenis | 4:4caae521ff66 | 90 | led1 = !led1 ; |
dhenis | 4:4caae521ff66 | 91 | |
dhenis | 4:4caae521ff66 | 92 | } |
dhenis | 4:4caae521ff66 | 93 | |
dhenis | 4:4caae521ff66 | 94 | if(flash2){ |
dhenis | 4:4caae521ff66 | 95 | |
dhenis | 4:4caae521ff66 | 96 | led2 = !led2 ; |
dhenis | 4:4caae521ff66 | 97 | } |
dhenis | 4:4caae521ff66 | 98 | |
dhenis | 4:4caae521ff66 | 99 | |
dhenis | 4:4caae521ff66 | 100 | Thread::wait(500) ; // 2x? |
dhenis | 4:4caae521ff66 | 101 | |
dhenis | 4:4caae521ff66 | 102 | // every cycle, just make 1 instruction |
dhenis | 4:4caae521ff66 | 103 | |
dhenis | 4:4caae521ff66 | 104 | check_flash1 = true; |
dhenis | 4:4caae521ff66 | 105 | |
dhenis | 4:4caae521ff66 | 106 | check_flash2 = true; |
dhenis | 4:4caae521ff66 | 107 | |
WilliamMarshQMUL | 0:a66a8cb0012c | 108 | } |
dhenis | 4:4caae521ff66 | 109 | } |