41 lines
1.0 KiB
C
41 lines
1.0 KiB
C
#include <avr/io.h>
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#define SET(REGISTER, BIT) REGISTER |= 1 << BIT
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#define CLEAR(REGISTER, BIT) REGISTER &= ~(1 << BIT)
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#define TEST(REGISTER, BIT) REGISTER & 1 << BIT
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#define TOGGLE(REGISTER, BIT) REGISTER ^= 1 << BIT
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#define D1 0
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#define D2 1
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#define D3 2
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#define D4 4
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int main()
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{
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// DDRx : select direction of the pin
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// - 1 = output (pull-up off)
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// - 0 = input
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// PORTx :
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// if DDRx = 1 (output mode) :
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// - 1 = HIGH (5V)
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// - 0 = LOW (0V)
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// if DDRx = 0 (input mode) :
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// - 1 = pull-up on
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// - 0 = pull-up off
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// PINx :
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SET(DDRB, D1); // make PB0 as OUTPUT (pullup is off)
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CLEAR(PORTB, D1); // make PB0 as HIGH (LED turns ON)
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// SET(DDRB, D2); // make PB1 as OUTPUT (pullup is off)
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// CLEAR(PORTB, D2); // make PB1 as LOW (LED turns OFF)
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// CLEAR(DDRB, D3); // make PB2 as INPUT
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// SET(PORTB, D3); // make PB2 pullup on
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// CLEAR(DDRB, D4); // make PB4 as INPUT
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// CLEAR(PORTB, D4); // make PB4 pullup off
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return 0;
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} |