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Why is no PWM signal generated using Timer 2?

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1

I managed to work with timer 0 and 1 but am unable to generate a PWM with timer 2 in my atmega328p.

This is the code:

#include <avr/io.h>



int main(void)

{

    /* PD6 output */

    DDRD |= (1 << DDD6);



    /* 50% duty cycle */

    OCR2A = 128;



    /* fast PWM  */

    TCCR2A |= (1 << WGM21) | (1 << WGM20);



    /* prescaler = 8 */

    TCCR2B |= (1 << CS21);



    while (1);



}

Could someone explain what the issue is and why I am not seeing a pwm signal on pin 6 of my arduino uno board?

Thanks

timers

share|improve this question

edited 7 hours ago

Duncan C

1,9801618

asked 8 hours ago

traduceradtraducerad

1062

New contributor

traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1

I managed to work with timer 0 and 1 but am unable to generate a PWM with timer 2 in my atmega328p.

This is the code:

#include <avr/io.h>



int main(void)

{

    /* PD6 output */

    DDRD |= (1 << DDD6);



    /* 50% duty cycle */

    OCR2A = 128;



    /* fast PWM  */

    TCCR2A |= (1 << WGM21) | (1 << WGM20);



    /* prescaler = 8 */

    TCCR2B |= (1 << CS21);



    while (1);



}

Could someone explain what the issue is and why I am not seeing a pwm signal on pin 6 of my arduino uno board?

Thanks

timers

share|improve this question

edited 7 hours ago

Duncan C

1,9801618

asked 8 hours ago

traduceradtraducerad

1062

New contributor

traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I managed to work with timer 0 and 1 but am unable to generate a PWM with timer 2 in my atmega328p.

This is the code:

#include <avr/io.h>



int main(void)

{

    /* PD6 output */

    DDRD |= (1 << DDD6);



    /* 50% duty cycle */

    OCR2A = 128;



    /* fast PWM  */

    TCCR2A |= (1 << WGM21) | (1 << WGM20);



    /* prescaler = 8 */

    TCCR2B |= (1 << CS21);



    while (1);



}

Could someone explain what the issue is and why I am not seeing a pwm signal on pin 6 of my arduino uno board?

Thanks

timers

share|improve this question

edited 7 hours ago

Duncan C

1,9801618

asked 8 hours ago

traduceradtraducerad

1062

New contributor

traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

#include <avr/io.h>



int main(void)

{

    /* PD6 output */

    DDRD |= (1 << DDD6);



    /* 50% duty cycle */

    OCR2A = 128;



    /* fast PWM  */

    TCCR2A |= (1 << WGM21) | (1 << WGM20);



    /* prescaler = 8 */

    TCCR2B |= (1 << CS21);



    while (1);



}

share|improve this question

edited 7 hours ago

Duncan C

1,9801618

asked 8 hours ago

traduceradtraducerad

1062

New contributor

traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 7 hours ago

Duncan C

1,9801618

asked 8 hours ago

traduceradtraducerad

1062

New contributor

traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 7 hours ago

Duncan C

1,9801618

edited 7 hours ago

Duncan C

1,9801618

asked 8 hours ago

traduceradtraducerad

1062

New contributor

traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 8 hours ago

traduceradtraducerad

1062

1 Answer
1

active

oldest

votes

3

The output compare unit of timer 2 is connected to pins PB3 (OC2A) and PD3 (OC2B). So you have to configure those as outputs.
Keep in mind that you can't choose any pin when using hardware pwm, this hardware feature is linked to fix pins.

Edit: you also have to set COM2A1 in TCCR2A. Otherwise OC2A is disconnected from the output compare unit (ref: Table 17-3 in datasheet).
The effect of COM2A0/1 depends on the configuration in WGM20-WGM22.
The same applies to OC2B respectively.

share|improve this answer

edited 23 mins ago

answered 7 hours ago

Sim SonSim Son

966

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
  
  – traducerad
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I compiled/flashed your code and I found that in TCCR2A you have to set COM2A1 (see my edit).
  
  – Sim Son
  22 mins ago
  
  
  

  
  
  
  

add a comment | 

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3

The output compare unit of timer 2 is connected to pins PB3 (OC2A) and PD3 (OC2B). So you have to configure those as outputs.
Keep in mind that you can't choose any pin when using hardware pwm, this hardware feature is linked to fix pins.

Edit: you also have to set COM2A1 in TCCR2A. Otherwise OC2A is disconnected from the output compare unit (ref: Table 17-3 in datasheet).
The effect of COM2A0/1 depends on the configuration in WGM20-WGM22.
The same applies to OC2B respectively.

share|improve this answer

edited 23 mins ago

answered 7 hours ago

Sim SonSim Son

966

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
  
  – traducerad
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I compiled/flashed your code and I found that in TCCR2A you have to set COM2A1 (see my edit).
  
  – Sim Son
  22 mins ago
  
  
  

  
  
  
  

add a comment | 

3

The output compare unit of timer 2 is connected to pins PB3 (OC2A) and PD3 (OC2B). So you have to configure those as outputs.
Keep in mind that you can't choose any pin when using hardware pwm, this hardware feature is linked to fix pins.

Edit: you also have to set COM2A1 in TCCR2A. Otherwise OC2A is disconnected from the output compare unit (ref: Table 17-3 in datasheet).
The effect of COM2A0/1 depends on the configuration in WGM20-WGM22.
The same applies to OC2B respectively.

share|improve this answer

edited 23 mins ago

answered 7 hours ago

Sim SonSim Son

966

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
  
  – traducerad
  1 hour ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I compiled/flashed your code and I found that in TCCR2A you have to set COM2A1 (see my edit).
  
  – Sim Son
  22 mins ago
  
  
  

  
  
  
  

add a comment | 

The output compare unit of timer 2 is connected to pins PB3 (OC2A) and PD3 (OC2B). So you have to configure those as outputs.
Keep in mind that you can't choose any pin when using hardware pwm, this hardware feature is linked to fix pins.

Edit: you also have to set COM2A1 in TCCR2A. Otherwise OC2A is disconnected from the output compare unit (ref: Table 17-3 in datasheet).
The effect of COM2A0/1 depends on the configuration in WGM20-WGM22.
The same applies to OC2B respectively.

share|improve this answer

edited 23 mins ago

answered 7 hours ago

Sim SonSim Son

966

share|improve this answer

edited 23 mins ago

answered 7 hours ago

Sim SonSim Son

966

answered 7 hours ago

Sim SonSim Son

966

answered 7 hours ago

Sim SonSim Son

966