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#include <avr/io.h> // Include file for I/O operations
#define BITVAL(bit) (1 << (bit))
#define CLRBIT(sfr, bit) (_SFR_BYTE(sfr) &= ~BITVAL(bit))
#define SETBIT(sfr, bit) (_SFR_BYTE(sfr) |= BITVAL(bit))
#define GETBIT(sfr, bit) (_SFR_BYTE(sfr) & BITVAL(bit))
int main (void)
{
uint8_t val;
DDRA = 0; // Port A as Input
PORTA = 1; // Enable pullup on PORTA, bit 0
DDRB = 1; // Pin 0 of Port B as output
for(;;)
{
val = GETBIT(PINA, 0);
if (val != 0)
SETBIT(PORTB, 0);
else
CLRBIT(PORTB, 0);
}
}
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