2.6 KiB
PWM Module
| Since | Origin / Contributor | Maintainer | Source |
|---|---|---|---|
| 2014-12-22 | Zeroday | Zeroday | pwm.c |
pwm.close()
Quit PWM mode for the specified GPIO pin.
Syntax
pwm.close(pin)
Parameters
pin 1~12, IO index
Returns
nil
See also
pwm.getclock()
Get selected PWM frequency of pin.
Syntax
pwm.getclock(pin)
Parameters
pin 1~12, IO index
Returns
number PWM frequency of pin
See also
See also
pwm.getduty()
Get selected duty cycle of pin.
Syntax
pwm.getduty(pin)
Parameters
pin 1~12, IO index
Returns
number duty cycle, max 1023
See also
pwm.setclock()
Set PWM frequency. Note: Setup of the PWM frequency will synchronously change other setups as well if there are any. Only one PWM frequency can be allowed for the system.
Syntax
pwm.setclock(pin, clock)
Parameters
pin1~12, IO indexclock1~1000, PWM frequency
Returns
nil
See also
pwm.setduty()
Set duty cycle for a pin.
Syntax
pwm.setduty(pin, duty)
Parameters
pin1~12, IO indexduty0~1023, pwm duty cycle, max 1023 (10bit)
Returns
nil
Example
-- D1 is connected to green led
-- D2 is connected to blue led
-- D3 is connected to red led
pwm.setup(1, 500, 512)
pwm.setup(2, 500, 512)
pwm.setup(3, 500, 512)
pwm.start(1)
pwm.start(2)
pwm.start(3)
function led(r, g, b)
pwm.setduty(1, g)
pwm.setduty(2, b)
pwm.setduty(3, r)
end
led(512, 0, 0) -- set led to red
led(0, 0, 512) -- set led to blue.
pwm.setup()
Set pin to PWM mode. Only 6 pins can be set to PWM mode at the most.
Syntax
pwm.setup(pin, clock, duty)
Parameters
pin1~12, IO indexclock1~1000, pwm frequencyduty0~1023, pwm duty cycle, max 1023 (10bit)
Returns
nil
Example
-- set pin index 1 as pwm output, frequency is 100Hz, duty cycle is half.
pwm.setup(1, 100, 512)
See also
pwm.start()
PWM starts, the waveform is applied to the GPIO pin.
Syntax
pwm.start(pin)
####Parameters
pin 1~12, IO index
Returns
nil
See also
pwm.stop()
Pause the output of the PWM waveform.
Syntax
pwm.stop(pin)
Parameters
pin 1~12, IO index
Returns
nil