44 lines
886 B
Plaintext
44 lines
886 B
Plaintext
/*Program code written for WinAVR toolset:
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-------------------------*/
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#include <avr\io.h>
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int main(void) {
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//Port D pins as input
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DDRD=0x00;
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//Enable internal pull ups
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PORTD=0xFF;
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//Set PORTB1 pin as output
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DDRB=0xFF;
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//TOP=ICR1;
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//Output compare OC1A 8 bit non inverted PWM
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//Clear OC1A on Compare Match, set OC1A at TOP
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//Fast PWM
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//ICR1=20000 defines 50Hz PWM
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ICR1=20000;
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TCCR1A|=(0<<COM1A0)|(1<<COM1A1)|(0<<COM1B0)|(0<<COM1B1)|
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(0<<FOC1A)|(0<<FOC1B)|(1<<WGM11)|(0<<WGM10);
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TCCR1B|=(0<<ICNC1)|(0<<ICES1)|(1<<WGM13)|(1<<WGM12)|
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(0<<CS12)|(1<<CS11)|(0<<CS10);
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//start timer with prescaler 8
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for (;;) {
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if(bit_is_clear(PIND, 0)){
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//increase duty cycle
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OCR1A+=10;
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loop_until_bit_is_set(PIND, 0);
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}
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if(bit_is_clear(PIND, 1)) {
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//decease duty cycle
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OCR1A-=10;
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loop_until_bit_is_set(PIND, 1);
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}
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}
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}
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//----------------------------------
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