Sunny Singh
LED chaser, like Knightrider sequence. Speed of sequence is controlled using serial interrupts.
main.cpp@0:b44ffe9b1e5b, 2010-07-29 (annotated)
- Committer:
- RandomSingh
- Date:
- Thu Jul 29 11:56:42 2010 +0000
- Revision:
- 0:b44ffe9b1e5b
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| RandomSingh | 0:b44ffe9b1e5b | 1 | /****************************************************************************** |
| RandomSingh | 0:b44ffe9b1e5b | 2 | ¬ Knightrider.c ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 3 | ¬ Uses the onboard LEDS on mBED to continuously perform LED chaser sequence ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 4 | ¬ LED Chaser sequence timimg can be changed by using the serial comms and ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 5 | ¬ activity on digital port. ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 6 | ¬ ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 7 | ¬ Written by RandomSingh. 05/2010 ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 8 | ¬ ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 9 | ******************************************************************************/ |
| RandomSingh | 0:b44ffe9b1e5b | 10 | |
| RandomSingh | 0:b44ffe9b1e5b | 11 | /* Libraries */ |
| RandomSingh | 0:b44ffe9b1e5b | 12 | #include "mbed.h" |
| RandomSingh | 0:b44ffe9b1e5b | 13 | |
| RandomSingh | 0:b44ffe9b1e5b | 14 | /* Output Assignements */ |
| RandomSingh | 0:b44ffe9b1e5b | 15 | DigitalOut myled(LED1); |
| RandomSingh | 0:b44ffe9b1e5b | 16 | DigitalOut myled2(LED2); |
| RandomSingh | 0:b44ffe9b1e5b | 17 | DigitalOut myled3(LED3); |
| RandomSingh | 0:b44ffe9b1e5b | 18 | DigitalOut myled4(LED4); |
| RandomSingh | 0:b44ffe9b1e5b | 19 | |
| RandomSingh | 0:b44ffe9b1e5b | 20 | /* Input Assignments */ |
| RandomSingh | 0:b44ffe9b1e5b | 21 | DigitalIn enable(p5); |
| RandomSingh | 0:b44ffe9b1e5b | 22 | |
| RandomSingh | 0:b44ffe9b1e5b | 23 | /* Interrupt Assignemnts */ |
| RandomSingh | 0:b44ffe9b1e5b | 24 | InterruptIn event(USBRX); |
| RandomSingh | 0:b44ffe9b1e5b | 25 | InterruptIn event2(p16); |
| RandomSingh | 0:b44ffe9b1e5b | 26 | |
| RandomSingh | 0:b44ffe9b1e5b | 27 | /* Serial Port Assignment */ |
| RandomSingh | 0:b44ffe9b1e5b | 28 | Serial pc(USBTX, USBRX); // tx, rx |
| RandomSingh | 0:b44ffe9b1e5b | 29 | |
| RandomSingh | 0:b44ffe9b1e5b | 30 | |
| RandomSingh | 0:b44ffe9b1e5b | 31 | /* Macro Definitions */ |
| RandomSingh | 0:b44ffe9b1e5b | 32 | #define LONGER 0.9 |
| RandomSingh | 0:b44ffe9b1e5b | 33 | #define LONG 0.4 |
| RandomSingh | 0:b44ffe9b1e5b | 34 | #define SHORT 0.05 |
| RandomSingh | 0:b44ffe9b1e5b | 35 | #define FWD 0 |
| RandomSingh | 0:b44ffe9b1e5b | 36 | #define REV 1 |
| RandomSingh | 0:b44ffe9b1e5b | 37 | #define SLOW 0 |
| RandomSingh | 0:b44ffe9b1e5b | 38 | #define MEDIUM 1 |
| RandomSingh | 0:b44ffe9b1e5b | 39 | #define FAST 2 |
| RandomSingh | 0:b44ffe9b1e5b | 40 | #define ON 1 |
| RandomSingh | 0:b44ffe9b1e5b | 41 | #define OFF 0 |
| RandomSingh | 0:b44ffe9b1e5b | 42 | |
| RandomSingh | 0:b44ffe9b1e5b | 43 | /* Prototype Function declartions */ |
| RandomSingh | 0:b44ffe9b1e5b | 44 | void initialise_LEDS(); |
| RandomSingh | 0:b44ffe9b1e5b | 45 | void trigger(); |
| RandomSingh | 0:b44ffe9b1e5b | 46 | void LED_chaser_sequence(); |
| RandomSingh | 0:b44ffe9b1e5b | 47 | |
| RandomSingh | 0:b44ffe9b1e5b | 48 | /* External Variables */ |
| RandomSingh | 0:b44ffe9b1e5b | 49 | int timer; |
| RandomSingh | 0:b44ffe9b1e5b | 50 | short speed; |
| RandomSingh | 0:b44ffe9b1e5b | 51 | int direction = FWD; |
| RandomSingh | 0:b44ffe9b1e5b | 52 | int phase; |
| RandomSingh | 0:b44ffe9b1e5b | 53 | |
| RandomSingh | 0:b44ffe9b1e5b | 54 | |
| RandomSingh | 0:b44ffe9b1e5b | 55 | |
| RandomSingh | 0:b44ffe9b1e5b | 56 | int main() { |
| RandomSingh | 0:b44ffe9b1e5b | 57 | |
| RandomSingh | 0:b44ffe9b1e5b | 58 | event.rise(&trigger); // Set up interrupts |
| RandomSingh | 0:b44ffe9b1e5b | 59 | event2.rise(&trigger); |
| RandomSingh | 0:b44ffe9b1e5b | 60 | initialise_LEDS(); |
| RandomSingh | 0:b44ffe9b1e5b | 61 | pc.printf("Speed is slow\r\n"); // Default speed is slow |
| RandomSingh | 0:b44ffe9b1e5b | 62 | |
| RandomSingh | 0:b44ffe9b1e5b | 63 | while(1) |
| RandomSingh | 0:b44ffe9b1e5b | 64 | {// Start of while |
| RandomSingh | 0:b44ffe9b1e5b | 65 | |
| RandomSingh | 0:b44ffe9b1e5b | 66 | LED_chaser_sequence(); |
| RandomSingh | 0:b44ffe9b1e5b | 67 | |
| RandomSingh | 0:b44ffe9b1e5b | 68 | }// End of while |
| RandomSingh | 0:b44ffe9b1e5b | 69 | }// End of main |
| RandomSingh | 0:b44ffe9b1e5b | 70 | |
| RandomSingh | 0:b44ffe9b1e5b | 71 | |
| RandomSingh | 0:b44ffe9b1e5b | 72 | /****************************************************************************** |
| RandomSingh | 0:b44ffe9b1e5b | 73 | ¬ trigger function - ISR ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 74 | ¬ If activity on the rx line of the serial port then this ISR executes ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 75 | ¬ This ISR changes the external variable 'speed' value, which is used for ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 76 | ¬ timing of the sequence. ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 77 | ¬ ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 78 | ¬ The objective of this ISR is to change the 'speed' value & transmit a ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 79 | ¬ a message to the serial port. ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 80 | ¬ ¬ |
| RandomSingh | 0:b44ffe9b1e5b | 81 | ******************************************************************************/ |
| RandomSingh | 0:b44ffe9b1e5b | 82 | void trigger() |
| RandomSingh | 0:b44ffe9b1e5b | 83 | {// Start of trigger |
| RandomSingh | 0:b44ffe9b1e5b | 84 | if(speed > FAST) // This bit of the code limits value of speed to 2 |
| RandomSingh | 0:b44ffe9b1e5b | 85 | {// Start of if // as there are only three levels of timing |
| RandomSingh | 0:b44ffe9b1e5b | 86 | speed = SLOW; |
| RandomSingh | 0:b44ffe9b1e5b | 87 | pc.printf("Speed is slow\r\n"); |
| RandomSingh | 0:b44ffe9b1e5b | 88 | }// End of if |
| RandomSingh | 0:b44ffe9b1e5b | 89 | else |
| RandomSingh | 0:b44ffe9b1e5b | 90 | {// Start of else |
| RandomSingh | 0:b44ffe9b1e5b | 91 | speed++; |
| RandomSingh | 0:b44ffe9b1e5b | 92 | }// End of else |
| RandomSingh | 0:b44ffe9b1e5b | 93 | |
| RandomSingh | 0:b44ffe9b1e5b | 94 | if(speed == MEDIUM) |
| RandomSingh | 0:b44ffe9b1e5b | 95 | pc.printf("Speed is medium\r\n"); |
| RandomSingh | 0:b44ffe9b1e5b | 96 | |
| RandomSingh | 0:b44ffe9b1e5b | 97 | if(speed == FAST) |
| RandomSingh | 0:b44ffe9b1e5b | 98 | pc.printf("Speed is fast\r\n"); |
| RandomSingh | 0:b44ffe9b1e5b | 99 | |
| RandomSingh | 0:b44ffe9b1e5b | 100 | }// End of trigger |
| RandomSingh | 0:b44ffe9b1e5b | 101 | |
| RandomSingh | 0:b44ffe9b1e5b | 102 | void LED_chaser_sequence() |
| RandomSingh | 0:b44ffe9b1e5b | 103 | {// Start of LED_chaser_sequence |
| RandomSingh | 0:b44ffe9b1e5b | 104 | switch(phase) |
| RandomSingh | 0:b44ffe9b1e5b | 105 | {// Start of switch |
| RandomSingh | 0:b44ffe9b1e5b | 106 | case 0: myled = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 107 | myled2 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 108 | myled3 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 109 | myled4 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 110 | wait(LONG); |
| RandomSingh | 0:b44ffe9b1e5b | 111 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 112 | direction = FWD; |
| RandomSingh | 0:b44ffe9b1e5b | 113 | phase++; |
| RandomSingh | 0:b44ffe9b1e5b | 114 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 115 | case 1: myled = ON; |
| RandomSingh | 0:b44ffe9b1e5b | 116 | myled2 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 117 | myled3 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 118 | myled4 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 119 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 120 | if(direction == FWD) |
| RandomSingh | 0:b44ffe9b1e5b | 121 | {// Start of if |
| RandomSingh | 0:b44ffe9b1e5b | 122 | phase++; |
| RandomSingh | 0:b44ffe9b1e5b | 123 | }// End of if |
| RandomSingh | 0:b44ffe9b1e5b | 124 | else |
| RandomSingh | 0:b44ffe9b1e5b | 125 | {// Start of else |
| RandomSingh | 0:b44ffe9b1e5b | 126 | phase--; |
| RandomSingh | 0:b44ffe9b1e5b | 127 | }// End of else |
| RandomSingh | 0:b44ffe9b1e5b | 128 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 129 | case 2: myled = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 130 | myled2 = ON; |
| RandomSingh | 0:b44ffe9b1e5b | 131 | myled3 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 132 | myled4 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 133 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 134 | if(direction == FWD) |
| RandomSingh | 0:b44ffe9b1e5b | 135 | {// Start of if |
| RandomSingh | 0:b44ffe9b1e5b | 136 | phase++; |
| RandomSingh | 0:b44ffe9b1e5b | 137 | }// End of if |
| RandomSingh | 0:b44ffe9b1e5b | 138 | else |
| RandomSingh | 0:b44ffe9b1e5b | 139 | {// Start of else |
| RandomSingh | 0:b44ffe9b1e5b | 140 | phase--; |
| RandomSingh | 0:b44ffe9b1e5b | 141 | }// End of else |
| RandomSingh | 0:b44ffe9b1e5b | 142 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 143 | case 3: myled = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 144 | myled2 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 145 | myled3 = ON; |
| RandomSingh | 0:b44ffe9b1e5b | 146 | myled4 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 147 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 148 | if(direction == FWD) |
| RandomSingh | 0:b44ffe9b1e5b | 149 | {// Start of if |
| RandomSingh | 0:b44ffe9b1e5b | 150 | phase++; |
| RandomSingh | 0:b44ffe9b1e5b | 151 | }// End of if |
| RandomSingh | 0:b44ffe9b1e5b | 152 | else |
| RandomSingh | 0:b44ffe9b1e5b | 153 | {// Start of else |
| RandomSingh | 0:b44ffe9b1e5b | 154 | phase--; |
| RandomSingh | 0:b44ffe9b1e5b | 155 | }// End of else |
| RandomSingh | 0:b44ffe9b1e5b | 156 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 157 | case 4: myled = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 158 | myled2 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 159 | myled3 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 160 | myled4 = ON; |
| RandomSingh | 0:b44ffe9b1e5b | 161 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 162 | direction = REV; |
| RandomSingh | 0:b44ffe9b1e5b | 163 | phase--; |
| RandomSingh | 0:b44ffe9b1e5b | 164 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 165 | default : |
| RandomSingh | 0:b44ffe9b1e5b | 166 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 167 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 168 | |
| RandomSingh | 0:b44ffe9b1e5b | 169 | }// End of switch |
| RandomSingh | 0:b44ffe9b1e5b | 170 | |
| RandomSingh | 0:b44ffe9b1e5b | 171 | switch(speed) |
| RandomSingh | 0:b44ffe9b1e5b | 172 | {// Start of switch |
| RandomSingh | 0:b44ffe9b1e5b | 173 | case SLOW : wait(LONGER); |
| RandomSingh | 0:b44ffe9b1e5b | 174 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 175 | case MEDIUM : wait(LONG); |
| RandomSingh | 0:b44ffe9b1e5b | 176 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 177 | case FAST : wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 178 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 179 | default : |
| RandomSingh | 0:b44ffe9b1e5b | 180 | wait(SHORT); |
| RandomSingh | 0:b44ffe9b1e5b | 181 | break; |
| RandomSingh | 0:b44ffe9b1e5b | 182 | }// End of switch |
| RandomSingh | 0:b44ffe9b1e5b | 183 | |
| RandomSingh | 0:b44ffe9b1e5b | 184 | }// End of LED_chaser_sequence |
| RandomSingh | 0:b44ffe9b1e5b | 185 | |
| RandomSingh | 0:b44ffe9b1e5b | 186 | void initialise_LEDS() |
| RandomSingh | 0:b44ffe9b1e5b | 187 | {// Start of initialise_LEDS |
| RandomSingh | 0:b44ffe9b1e5b | 188 | |
| RandomSingh | 0:b44ffe9b1e5b | 189 | myled = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 190 | myled2 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 191 | myled3 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 192 | myled4 = OFF; |
| RandomSingh | 0:b44ffe9b1e5b | 193 | |
| RandomSingh | 0:b44ffe9b1e5b | 194 | }// End of initialise_LEDS |