Sunny Singh
LED chaser, like Knightrider sequence. Speed of sequence is controlled using serial interrupts.
Revision 0:b44ffe9b1e5b, committed 2010-07-29
- Comitter:
- RandomSingh
- Date:
- Thu Jul 29 11:56:42 2010 +0000
- Commit message:
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r b44ffe9b1e5b main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Jul 29 11:56:42 2010 +0000
@@ -0,0 +1,194 @@
+/******************************************************************************
+¬ Knightrider.c ¬
+¬ Uses the onboard LEDS on mBED to continuously perform LED chaser sequence ¬
+¬ LED Chaser sequence timimg can be changed by using the serial comms and ¬
+¬ activity on digital port. ¬
+¬ ¬
+¬ Written by RandomSingh. 05/2010 ¬
+¬ ¬
+******************************************************************************/
+
+/* Libraries */
+#include "mbed.h"
+
+/* Output Assignements */
+DigitalOut myled(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+
+/* Input Assignments */
+DigitalIn enable(p5);
+
+/* Interrupt Assignemnts */
+InterruptIn event(USBRX);
+InterruptIn event2(p16);
+
+/* Serial Port Assignment */
+Serial pc(USBTX, USBRX); // tx, rx
+
+
+/* Macro Definitions */
+#define LONGER 0.9
+#define LONG 0.4
+#define SHORT 0.05
+#define FWD 0
+#define REV 1
+#define SLOW 0
+#define MEDIUM 1
+#define FAST 2
+#define ON 1
+#define OFF 0
+
+/* Prototype Function declartions */
+void initialise_LEDS();
+void trigger();
+void LED_chaser_sequence();
+
+/* External Variables */
+int timer;
+short speed;
+int direction = FWD;
+int phase;
+
+
+
+int main() {
+
+ event.rise(&trigger); // Set up interrupts
+ event2.rise(&trigger);
+ initialise_LEDS();
+ pc.printf("Speed is slow\r\n"); // Default speed is slow
+
+ while(1)
+ {// Start of while
+
+ LED_chaser_sequence();
+
+ }// End of while
+}// End of main
+
+
+/******************************************************************************
+¬ trigger function - ISR ¬
+¬ If activity on the rx line of the serial port then this ISR executes ¬
+¬ This ISR changes the external variable 'speed' value, which is used for ¬
+¬ timing of the sequence. ¬
+¬ ¬
+¬ The objective of this ISR is to change the 'speed' value & transmit a ¬
+¬ a message to the serial port. ¬
+¬ ¬
+******************************************************************************/
+void trigger()
+{// Start of trigger
+ if(speed > FAST) // This bit of the code limits value of speed to 2
+ {// Start of if // as there are only three levels of timing
+ speed = SLOW;
+ pc.printf("Speed is slow\r\n");
+ }// End of if
+ else
+ {// Start of else
+ speed++;
+ }// End of else
+
+ if(speed == MEDIUM)
+ pc.printf("Speed is medium\r\n");
+
+ if(speed == FAST)
+ pc.printf("Speed is fast\r\n");
+
+}// End of trigger
+
+void LED_chaser_sequence()
+{// Start of LED_chaser_sequence
+switch(phase)
+ {// Start of switch
+ case 0: myled = OFF;
+ myled2 = OFF;
+ myled3 = OFF;
+ myled4 = OFF;
+ wait(LONG);
+ wait(SHORT);
+ direction = FWD;
+ phase++;
+ break;
+ case 1: myled = ON;
+ myled2 = OFF;
+ myled3 = OFF;
+ myled4 = OFF;
+ wait(SHORT);
+ if(direction == FWD)
+ {// Start of if
+ phase++;
+ }// End of if
+ else
+ {// Start of else
+ phase--;
+ }// End of else
+ break;
+ case 2: myled = OFF;
+ myled2 = ON;
+ myled3 = OFF;
+ myled4 = OFF;
+ wait(SHORT);
+ if(direction == FWD)
+ {// Start of if
+ phase++;
+ }// End of if
+ else
+ {// Start of else
+ phase--;
+ }// End of else
+ break;
+ case 3: myled = OFF;
+ myled2 = OFF;
+ myled3 = ON;
+ myled4 = OFF;
+ wait(SHORT);
+ if(direction == FWD)
+ {// Start of if
+ phase++;
+ }// End of if
+ else
+ {// Start of else
+ phase--;
+ }// End of else
+ break;
+ case 4: myled = OFF;
+ myled2 = OFF;
+ myled3 = OFF;
+ myled4 = ON;
+ wait(SHORT);
+ direction = REV;
+ phase--;
+ break;
+ default :
+ wait(SHORT);
+ break;
+
+ }// End of switch
+
+ switch(speed)
+ {// Start of switch
+ case SLOW : wait(LONGER);
+ break;
+ case MEDIUM : wait(LONG);
+ break;
+ case FAST : wait(SHORT);
+ break;
+ default :
+ wait(SHORT);
+ break;
+ }// End of switch
+
+}// End of LED_chaser_sequence
+
+void initialise_LEDS()
+{// Start of initialise_LEDS
+
+ myled = OFF;
+ myled2 = OFF;
+ myled3 = OFF;
+ myled4 = OFF;
+
+}// End of initialise_LEDS
\ No newline at end of file
diff -r 000000000000 -r b44ffe9b1e5b mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Jul 29 11:56:42 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/3944f1e2fa4f