Why is no PWM signal generated using Timer 2?
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
edited Apr 6 at 13:45
Duncan C
1,9801618
asked Apr 6 at 12:58
traduceradtraducerad
1183
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
edited Apr 6 at 13:45
Duncan C
1,9801618
asked Apr 6 at 12:58
traduceradtraducerad
1183
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.
2
The post is definitely on topic. I don't understand why it has attracted a vote to be closed.
– MichaelT
Apr 6 at 23:45
I am the one who up-voted the question, one of the three up-votes for the answer, and just up-voted your comment :)
– VE7JRO
Apr 7 at 0:12
It's a shame that multitudes of "leave open" votes don't cancel our erroneous "off-topic" votes. Clearly on-topic. And timers are always such fun! :)
– Madivad
9 hours ago
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
edited Apr 6 at 13:45
Duncan C
1,9801618
asked Apr 6 at 12:58
traduceradtraducerad
1183
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.
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
timers
edited Apr 6 at 13:45
Duncan C
1,9801618
asked Apr 6 at 12:58
traduceradtraducerad
1183
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 Apr 6 at 13:45
Duncan C
1,9801618
asked Apr 6 at 12:58
traduceradtraducerad
1183
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 Apr 6 at 13:45
Duncan C
1,9801618
edited Apr 6 at 13:45
Duncan C
1,9801618
edited Apr 6 at 13:45
Duncan C
1,9801618
1,9801618
asked Apr 6 at 12:58
traduceradtraducerad
1183
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 Apr 6 at 12:58
traduceradtraducerad
1183
asked Apr 6 at 12:58
traduceradtraducerad
1183
1183
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.
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.
traducerad is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
2
The post is definitely on topic. I don't understand why it has attracted a vote to be closed.
– MichaelT
Apr 6 at 23:45
I am the one who up-voted the question, one of the three up-votes for the answer, and just up-voted your comment :)
– VE7JRO
Apr 7 at 0:12
It's a shame that multitudes of "leave open" votes don't cancel our erroneous "off-topic" votes. Clearly on-topic. And timers are always such fun! :)
– Madivad
9 hours ago
add a comment |
2
The post is definitely on topic. I don't understand why it has attracted a vote to be closed.
– MichaelT
Apr 6 at 23:45
I am the one who up-voted the question, one of the three up-votes for the answer, and just up-voted your comment :)
– VE7JRO
Apr 7 at 0:12
It's a shame that multitudes of "leave open" votes don't cancel our erroneous "off-topic" votes. Clearly on-topic. And timers are always such fun! :)
– Madivad
9 hours ago
2
2
The post is definitely on topic. I don't understand why it has attracted a vote to be closed.
– MichaelT
Apr 6 at 23:45
The post is definitely on topic. I don't understand why it has attracted a vote to be closed.
– MichaelT
Apr 6 at 23:45
I am the one who up-voted the question, one of the three up-votes for the answer, and just up-voted your comment :)
– VE7JRO
Apr 7 at 0:12
I am the one who up-voted the question, one of the three up-votes for the answer, and just up-voted your comment :)
– VE7JRO
Apr 7 at 0:12
It's a shame that multitudes of "leave open" votes don't cancel our erroneous "off-topic" votes. Clearly on-topic. And timers are always such fun! :)
– Madivad
9 hours ago
It's a shame that multitudes of "leave open" votes don't cancel our erroneous "off-topic" votes. Clearly on-topic. And timers are always such fun! :)
– Madivad
9 hours ago
add a comment |
1 Answer
1
active
oldest
votes
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 specific pins.
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.
answered Apr 6 at 13:30
Sim SonSim Son
1316
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I compiled/flashed your code and I found that inTCCR2Ayou have to setCOM2A1(see my edit).
– Sim Son
Apr 6 at 20:37
@traducerad: The comment// enable timer 2in your code is wrong. It should be// disable timer 2in order to be consistent with what the following line actually does.
– Edgar Bonet
2 days ago
add a comment |
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1 Answer
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1 Answer
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oldest
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votes
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 specific pins.
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.
answered Apr 6 at 13:30
Sim SonSim Son
1316
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I compiled/flashed your code and I found that inTCCR2Ayou have to setCOM2A1(see my edit).
– Sim Son
Apr 6 at 20:37
@traducerad: The comment// enable timer 2in your code is wrong. It should be// disable timer 2in order to be consistent with what the following line actually does.
– Edgar Bonet
2 days 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 specific pins.
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.
answered Apr 6 at 13:30
Sim SonSim Son
1316
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I compiled/flashed your code and I found that inTCCR2Ayou have to setCOM2A1(see my edit).
– Sim Son
Apr 6 at 20:37
@traducerad: The comment// enable timer 2in your code is wrong. It should be// disable timer 2in order to be consistent with what the following line actually does.
– Edgar Bonet
2 days 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 specific pins.
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.
answered Apr 6 at 13:30
Sim SonSim Son
1316
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 specific pins.
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.
answered Apr 6 at 13:30
Sim SonSim Son
1316
edited Apr 6 at 23:57
answered Apr 6 at 13:30
Sim SonSim Son
1316
answered Apr 6 at 13:30
Sim SonSim Son
1316
answered Apr 6 at 13:30
Sim SonSim Son
1316
1316
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I compiled/flashed your code and I found that inTCCR2Ayou have to setCOM2A1(see my edit).
– Sim Son
Apr 6 at 20:37
@traducerad: The comment// enable timer 2in your code is wrong. It should be// disable timer 2in order to be consistent with what the following line actually does.
– Edgar Bonet
2 days ago
add a comment |
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I compiled/flashed your code and I found that inTCCR2Ayou have to setCOM2A1(see my edit).
– Sim Son
Apr 6 at 20:37
@traducerad: The comment// enable timer 2in your code is wrong. It should be// disable timer 2in order to be consistent with what the following line actually does.
– Edgar Bonet
2 days ago
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I tried what you suggested, but that doesn't seem to work: paste.ubuntu.com/p/K8KmKnqyvV Any suggestions?
– traducerad
Apr 6 at 19:40
I compiled/flashed your code and I found that in
TCCR2A you have to set COM2A1 (see my edit).– Sim Son
Apr 6 at 20:37
I compiled/flashed your code and I found that in
TCCR2A you have to set COM2A1 (see my edit).– Sim Son
Apr 6 at 20:37
@traducerad: The comment
// enable timer 2 in your code is wrong. It should be // disable timer 2 in order to be consistent with what the following line actually does.– Edgar Bonet
2 days ago
@traducerad: The comment
// enable timer 2 in your code is wrong. It should be // disable timer 2 in order to be consistent with what the following line actually does.– Edgar Bonet
2 days ago
add a comment |
traducerad is a new contributor. Be nice, and check out our Code of Conduct.
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2
The post is definitely on topic. I don't understand why it has attracted a vote to be closed.
– MichaelT
Apr 6 at 23:45
I am the one who up-voted the question, one of the three up-votes for the answer, and just up-voted your comment :)
– VE7JRO
Apr 7 at 0:12
It's a shame that multitudes of "leave open" votes don't cancel our erroneous "off-topic" votes. Clearly on-topic. And timers are always such fun! :)
– Madivad
9 hours ago