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attiny [2019/12/06 15:47] – [prescaler] yairattiny [2019/12/14 17:15] – yair
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 attinyX5 Family in all their gory details attinyX5 Family in all their gory details
  
-{{:atmel-2586-avr-8-bit-microcontroller-attiny25-attiny45-attiny85_datasheet.pdf|ATtiny25-ATtiny45-ATtiny85_Datasheet}}+ 
 +====pinouts==== 
 +===ATtinyx5===
 <code c> <code c>
      ATTiny pinout      ATTiny pinout
                          +-\/-+                          +-\/-+
                   Reset 1|    |8  VCC                   Reset 1|    |8  VCC
-    (pin3) in 0 A3  PB3 2|    |7  PB2 (pin2) out mixed +    (pin3) in 0 A3  PB3 2|    |7  PB2 (pin2) out mixed / SCK 
-    (pin4) in 1 A2  PB4 3|    |6  PB1 (pin1) out 1 +    (pin4) in 1 A2  PB4 3|    |6  PB1 (pin1) out 1 / MISO 
-                    GND 4|    |5  PB0 (pin0) out 0+                    GND 4|    |5  PB0 (pin0) out 0 / MOSI
                          ------                          ------
 </code> </code>
 +{{:atmel-2586-avr-8-bit-microcontroller-attiny25-attiny45-attiny85_datasheet.pdf|ATtiny25-ATtiny45-ATtiny85_Datasheet}}
 +
 +===USBASP V2.0===
 +{{:usbasp-v2.0-idc-pinout.png?300}}\\
 +found [[https://tosiek.pl/usbasp-v2-0-warning-cannot-set-sck-period/|here]]
 +
 +drivers, linux "just works":, windows is [[https://forum.arduino.cc/index.php?topic=415210.msg2862244#msg2862244|a mess]]
 +
 +====CORE====
 +[[https://github.com/SpenceKonde/ATTinyCore|spencerCOre]]
 +note his warning\\
 +<quote>When using a chip for the first time, or after changing the clock speed or BOD settings, you must do "burn bootloader" to set the fuses, even if you are not using the chip with a bootloader</quote>
 ====System Clock Prescaler==== ====System Clock Prescaler====
 goal:to control prescaler goal:to control prescaler
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                   ------                   ------
 */ */
 +</code>
 +and
 +<code c>
 +// the setup function runs once when you press reset or power the board
 +void setup() {
 +
 +  DDRB = B00000111;  //could use this
 +
 +  // initialize timer1
 +  noInterrupts();           // disable all interrupts
 +
 +  TCCR1 = 0;                  //stop the timer
 +  TCNT1 = 0;                  //zero the timer
 +
 +  OCR1A = 200;     //50           //set the compare value
 +  OCR1C = 200;       //50         //set the compare value  ??? needed
 +
 +  TIMSK = _BV(OCIE1A);        //interrupt on Compare Match A
 +
 +  TCCR1 = _BV(CTC1) | _BV(CS11); // Start timer, ctc mode, prescaler clk/2
 +
 +  interrupts();             // enable all interrupts
 +}
 +
 </code> </code>
 {{:pasted:20191206-134349.png}} {{:pasted:20191206-134349.png}}