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#define DELAY 200
#define ON 0x01
#define OFF 0x00
#define NUM_LEDS 0x03
#define RED_LED 0x400000
#define BLUE_LED 0x200000
#define GREEN_LED 0x080000
void setup_GPIO();
int set_LED(int color, int state);
void setup_timer_irq();
void wait_for_irq();
void delay(int milliseconds);
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