1. Assume there are 8 LEDs on a development board and also assume that LEDs blin

Question

1.      Assume there are 8 LEDs on a development board and also assume that LEDs blink with step 1 and 2 pattern recursively on 8 LEDs as illustrated in Fig. 1

. Also assume that the LEDs are active-high enabled on the develop

ment board.

a.      Write a C program that performs a LED blinking pattern. Grading: header/include file declaration (1 pts), I/O ports declaration (1 pts), delay function (1 pts), LED patterns (7 pts)

b.      Draw a LED wiring diagram that allows a LED to come on with a low signal and to come off with a high signal.

Assume there are 8 LEDs on a development board and also assume that LEDs blink with step 1 and 2 pattern recursively on 8 LEDs as illustrated in Fig. 1 Also assume that the LEDs are active-high enabled on the develop ment board. Write a C program that performs a LED blinking pattern. Grading: header/include file declaration , I/O ports declaration , delay function , LED patterns Draw a LED wiring diagram that allows a LED to come on with a low signal and to come off with a high signal.

Explanation / Answer

#include #define F_CPU 4000000UL #include int main() { DDRC = 0xFF; // Configure port C as output... while(1) { PORTC = 0xAA; // Turn ON LEDs _delay_ms(250); // Wait 250ms... u can change this if u want PORTC = 0x55; // Turn OFF LEDs _delay_ms(250); // Wail 250ms } return 0; }

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