index :: hw

hw.rpi.pwm

hardware PWM output for RaspberryPi

available since version: 0.9.8

---

information

|| Versions <5.0 The BCM283x SoC supports 2 hardware PWM channels. By default, the channels are mapped as follows: • PWM0 = GPIO12/GPIO18 • PWM1 = GPIO13/GPIO19 Consult the official documentation on how to enable and configure these. Note: the Raspberry Pi?s analog audio output uses both PWM channels. Playing audio and simultaneously accessing a PWM channel may cause issues. ~ || Raspberry Pi 5 and later The Raspberry Pi 5 support 4 hardware PWM channels. By default, the channels are mapped as follows: • PWM0 = GPIO12 • PWM1 = GPIO13 • PWM2 = GPIO18 • PWM3 = GPIO19 Consult the official documentation on how to enable and configure these. ~ Some of the GPIO pins capable of supporting hardware PWM can also be configured for use with other peripherals. Be careful not to enable two peripherals on the same pin at the same time.

arguments:

• PWM_CH PWM channel. See @ch
  type: int
  

methods:

• duty set duty cycle
  parameters:
  • DUTY duty cycle
    type: float
    required: True
    
• enable enable PWM. By default it is disabled.
  parameters:
  • ENABLE value
    type: bool
    required: True
    
• freq set frequency
  parameters:

  • FREQ frequency
    type: float
    units: Hz
    required: True
    

  • DUTY duty cycle
    type: float
    required: True
    

• period set period. Expected width<=pulse.
  parameters:
  • PERIOD the whole cycle period
    type: float
    units: ms
    required: True
    
• polarity set output polarity
  parameters:
  • INVERTED new value. If true: polarity is inverted
    type: bool
    required: True
    
• pwm set period and pulse width. Expected width<=pulse.
  parameters:

  • PERIOD the whole cycle period
    type: float
    units: ms
    required: True
    

  • WIDTH pulse width
    type: float
    units: ms
    required: True
    

• width set pulse width. Expected width<=pulse.
  parameters:
  • WIDTH pulse width
    type: float
    units: ms
    required: True
    

properties:

• @pwm_ch (initonly) Get/set PWM channel. Valid values are: 0-3. If equals -1: no PWM channel selected.
  type: int
  range: -1..3
  default: -1
  

inlets:

• input messages
  type: control

outlets:

• no output
  type: control

keywords:

pwm hawdware rpi raspberry

Authors: Serge Poltavsky

License: GPL3 or later