https://www.marcelpost.com/wiki/index.php?action=history&feed=atom&title=ATtiny85_PWM 2026-05-17T04:11:25Z Revision history for this page on the wiki MediaWiki 1.39.17 https://www.marcelpost.com/wiki/index.php?title=ATtiny85_PWM&diff=2140&oldid=prev 2016-02-01T09:12:34Z

<p></p> <p><b>New page</b></p><div>This is a cut-and-paste example of setting PWM on a Atmel AVR ATtiny85. It uses pin PB0.<br /> <br /> [[File:Attiny85_pinout.png]]<br /> <br /> <br /> <br /> Tested on: ATtiny85<br /> <br /> &lt;pre&gt;<br /> <br /> #include &lt;avr/io.h&gt;<br /> #include &lt;util/delay.h&gt;<br /> #include &lt;avr/pgmspace.h&gt;<br /> <br /> #define HIGH 1<br /> #define LOW 0<br /> #define INPUT 1<br /> #define OUTPUT 0<br /> <br /> #define LED PB0 // OC0A PWM output pin (on t84=PB2, t85=PB0)<br /> #define SWITCH PB4 // ptt switch<br /> <br /> const uint8_t sine_wave_50[] PROGMEM= <br /> {<br /> 133,145,158,168,179,189,196,204,209,214,<br /> 217,219,219,219,217,212,207,199,191,184,<br /> 176,166,156,143,133,122,112, 99, 89, 79,<br /> 71, 64, 56, 48, 43, 38, 36, 36, 36, 38,<br /> 41, 46, 51, 59, 66, 77, 87, 97,110,122,<br /> };<br /> <br /> void init_pwm()<br /> {<br /> //Set PORTB1 pin as output<br /> DDRB=0xFF;<br /> // initial OCR1A value<br /> OCR0A=80;<br /> //Output compare OC1A 8 bit non inverted PWM<br /> TCCR0A=0x91;<br /> //start timer without prescaler<br /> TCCR0B=0x01;<br /> //enable output compare interrupt for OCR1A<br /> TIMSK=0x10;<br /> }<br /> <br /> int main()<br /> {<br /> pinMode(SWITCH,OUTPUT);<br /> digitalWrite(SWITCH,LOW);<br /> <br /> init_pwm();<br /> uint8_t step=0;<br /> <br /> while(1)<br /> {<br /> <br /> digitalWrite(SWITCH,HIGH);<br /> <br /> // send a 1000Hz tone <br /> for (step=0; step&lt;50; step++)<br /> {<br /> OCR0A = pgm_read_byte(&amp;sine_wave_50[step]);<br /> _delay_us(20); <br /> }<br /> <br /> }<br /> <br /> return 0;<br /> }<br /> <br /> &lt;/pre&gt;<br /> <br /> <br /> <br /> See also:<br /> <br /> * [[ATtiny84_PWM]]<br /> * [[ATtiny85_ADC]]</div>

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