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#include <avr/io.h>
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void led_on(volatile uint8_t* portp, uint8_t pinn) {
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*portp |= _BV(pinn);
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}
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void led_off(volatile uint8_t* portp, uint8_t pinn) {
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*portp &= ~ _BV(pinn);
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}
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void main()
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{
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led_on(&PORTB, 3);
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led_off(&PORTB, 5);
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led_on(&DDRB, 3);
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}
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