21 lines
911 B
Plaintext
21 lines
911 B
Plaintext
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Registers involved:
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GPIO:
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DDRB: Data Direction Register for Port B= 0xFF for output
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PWM Module:
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OCR0A: Output Compare Register A=Value here is compared with the Timer value,and when the value matches, the specific pin[pin OC0A(pin 13) in this case] gets toggled
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TCCR0A: Timer/Counter 0 Control Register A = 0x83
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Bit [7:6]= COM0A-Compare Output Mode A = 10-Non-inverting PWM-Clear OC0A on Compare Match
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Bit [1:0]= WGM[1:0]- Waveform Generation Mode=11- for non-inverting fast PWM.
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TCCR0B: Timer/Counter 0 Control Register B = 0x03
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Bit [2:0] – CS0[2:0]-Clock Select = 011- for prescaler=64 in order to obtain frequency of 1kHz
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The PWM runs in a loop with duty-cycle varying(i.e. changing value of OCR0A) such that the mean value follows a linear pattern. This function maybe helpful in AC generators.
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inbuilt delay function used to induce a delay of 0.5 seconds before the duty cycle of the PWM changes
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