PWM functionality

[cass3825Participant March 17, 2019 at 18:10 Post count: 2]

#633

I have ch7 configured as pwm output for a buzzer using the following commands on screen 0 pre-init:

pwm7=50 // duty cycle
cfgpio 7,3,0 // buzzer pin
pwmf=1000 // frequency

This works great, the buzzer immediately sounds. The issue is turning it off! Common sense says pio7=0 should work, but no luck. I’m currently setting pwmf=65535 to make the buzzer inaudible, but this limits pwm functionality on pins 4 through 6. Reconfiguring pin 7 as an input also works to silence the buzzer, but this seems clunky. Is there a better way?

[Patrick MartinKeymaster March 27, 2019 at 01:11 Post count: 3]

#636

pio7=0 would work if the io7 was configured for output.
You have io7 configured for PWM, so pio7=1 and pio7=0 are less useful.

I achieve silence by

cfgpio 7,2,0
pio7=0

Other settings tend to have a slight residual noise.

[DotTuminParticipant September 2, 2019 at 16:29 Post count: 1]

#769

Hi…the option of controlling the fan speed and the satisfaction of silent computing were not always present when it comes to personal computers. The early x86 computers did not have active cooling because not much heat was generated, right until the introduction of the first 486 models. From that time and up until now, the computer power consumption and thermal dissipation have grown exponentially, as well as their performance.

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