Difference between revisions of "Component: PWM (Internal) (General Output)"

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==PWM (Internal) component==
 
==PWM (Internal) component==
 
Pulse Width Modulation, a versitile way of generating a digital pulse using mark / space modulation. Uses the capture compare peripherals onboard most Microcontrollers to generate accurate waveforms without any intervention from the processor. Useful for generating audio, controlling the speed of motors, brightness of LED etc.
 
Pulse Width Modulation, a versitile way of generating a digital pulse using mark / space modulation. Uses the capture compare peripherals onboard most Microcontrollers to generate accurate waveforms without any intervention from the processor. Useful for generating audio, controlling the speed of motors, brightness of LED etc.
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==Version information==
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Library Version, Component Version, Date, Author, Info
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11, 11.0, 15-10-24, BR, Fixed change frequency and duty for ESP32
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12, 12.0, 15-10-24, MW, Fixed Digital version as visually looks wrong
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==Detailed description==
 
==Detailed description==
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==Examples==
 
==Examples==
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Digital PWM trace
 
Digital PWM trace
  
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[[File:PWMDigital.jpg]]
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[[File:PWMDigital.png]]
  
  
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{{Fcfile|PWM_fader.fcfx|PWM Fader}}
 
{{Fcfile|PWM_fader.fcfx|PWM Fader}}
  
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==Downloadable macro reference==
 
  
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==Macro reference==
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===ChangePeriod===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
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===Disable===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
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===Enable===
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
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|-
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| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Enable'''
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|-
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| colspan="2" | Enables a PWM channel as an output overriding the default output pin state. 
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|-
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|-
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
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| width="90%" style="border-top: 2px solid #000;" | ''Return''
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|}
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===SetDutyCycle===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
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===SetDutyCycle10Bit===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
|-
 
|-
 
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
 
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Enable'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SetDutyCycle10Bit'''
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|-
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| colspan="2" | PIC/AVR - Sets the full scale PWM duty cycle based on the current period setting. If period = 255 then Duty of 512 is equal to 50%.  16-bit PICs have a 16-bit period range available. If period = 65535 then Duty of 32768 is equal to 50%. 
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|-
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| colspan="2" | Enables a PWM channel as an output overriding the default output pin state. 
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| width="10%" align="center" | [[File:Fc9-u16-icon.png]] - UINT
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| width="90%" | Duty
 
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|-
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| colspan="2" | PWM duty PIC/AVR: 0-1023 16-bit PIC: 0-65535 
 
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
 
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
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===SetFrequency===
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
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|}
 
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==Property reference==
  
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
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|-
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| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''SetDutyCycle10Bit'''
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''  
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|-
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|-
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Connections
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|-
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|-
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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| width="90%" | Channel
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|-
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| colspan="2" | Selects which PWM channel the component is connected to. 
 
|-
 
|-
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| colspan="2" | PIC/AVR - Sets the full scale PWM duty cycle based on the current period setting. If period = 255 then Duty of 512 is equal to 50%.  16-bit PICs have a 16-bit period range available. If period = 65535 then Duty of 32768 is equal to 50%. 
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| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
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| width="90%" | Alternative pin
 
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|-
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| colspan="2" | Allows an alternate pin to be used if available.  Note that on some devices you will also have to change this setting in the device configuration. 
 
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| width="10%" align="center" | [[File:Fc9-u16-icon.png]] - UINT
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| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
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| width="90%" | Duty
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| width="90%" | PWM Pin
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| colspan="2" | Specifies the pin assigned to the PWM channel selected 
 
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| colspan="2" | PWM duty PIC/AVR: 0-1023 16-bit PIC: 0-65535 
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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| width="90%" | Remap Pin
 
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
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| colspan="2" | Allows the PWM hardware pin to be reassigned to another pin 
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| width="90%" style="border-top: 2px solid #000;" | ''Return''
 
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|}
 
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==Property reference==
 
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
 
|-
 
|-
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| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | PWM Frequency
 
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| colspan="2" | Displays the frequency of PWM cycles per second. 
 
| colspan="2" | Displays the frequency of PWM cycles per second. 
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Calculations
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|-
 
|-
 
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| width="10%" align="center" | [[File:Fc9-type-15-icon.png]]
 
| width="10%" align="center" | [[File:Fc9-type-15-icon.png]]
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| colspan="2" | Applies the calculated period and prescaler settings to the PWM component default settings. 
 
| colspan="2" | Applies the calculated period and prescaler settings to the PWM component default settings. 
 
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|-
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| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-conn-icon.png]]
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Connections'''
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Simulation
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|-
 
−
|-
 
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 
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| width="90%" | Channel
 
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| colspan="2" | Selects which PWM channel the component is connected to. 
 
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|-
 
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| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
 
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| width="90%" | Alternative pin
 
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|-
 
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| colspan="2" | Allows an alternate pin to be used if available.  Note that on some devices you will also have to change this setting in the device configuration. 
 
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|-
 
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| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
 
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| width="90%" | PWM Pin
 
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|-
 
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| colspan="2" | Specifies the pin assigned to the PWM channel selected 
 
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|-
 
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 
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| width="90%" | Remap Pin
 
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|-
 
−
| colspan="2" | Allows the PWM hardware pin to be reassigned to another pin 
 
−
|-
 
−
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-conn-icon.png]]
 
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Simulations'''
 
 
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| colspan="2" | Edits how the PWM is shown on the simulation panel. 
 
| colspan="2" | Edits how the PWM is shown on the simulation panel. 
 
|}
 
|}
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==Component Source Code==
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Please click here to download the component source project: [https://www.flowcode.co.uk/wiki/componentsource/FC_Comp_Source_PWM_Output.fcfx FC_Comp_Source_PWM_Output.fcfx]
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Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_PWM_Output.fcfx FC_Comp_Source_PWM_Output.fcfx]

Latest revision as of 21:16, 27 January 2026

Author Matrix Ltd
Version 12.0
Category General Output


PWM (Internal) component

Pulse Width Modulation, a versitile way of generating a digital pulse using mark / space modulation. Uses the capture compare peripherals onboard most Microcontrollers to generate accurate waveforms without any intervention from the processor. Useful for generating audio, controlling the speed of motors, brightness of LED etc.

Version information

Library Version, Component Version, Date, Author, Info
11, 11.0, 15-10-24, BR, Fixed change frequency and duty for ESP32
12, 12.0, 15-10-24, MW, Fixed Digital version as visually looks wrong


Detailed description

No detailed description exists yet for this component

Examples

Here is a basic example to control the PWM duty based on an ADC reading.

FC6 Icon.png PWMDemo

Digital PWM trace

PWMDigital.png


Here is another basic example which ramps the PWM duty cycle up and down. If the PWM output pin is connected to a LED and series resistor then the LED will smoothly transition between on bright and off.

FC6 Icon.png PWM Fader


Macro reference

ChangePeriod

Fc9-comp-macro.png ChangePeriod
Sets the overall period and prescaler of the output PWM signal. 
Fc9-u16-icon.png - UINT Period
The maximum number that will represent 100% on, PIC/AVR: 0-255 16-bit PIC: 0-65535 
Fc9-s16-icon.png - INT Prescaler
The scaler used to divide the system clock speed down to the PWM rate. 
Fc9-void-icon.png - VOID Return


Disable

Fc9-comp-macro.png Disable
Disables a PWM channel and allows the default output / input state to be resumed 
Fc9-void-icon.png - VOID Return


Enable

Fc9-comp-macro.png Enable
Enables a PWM channel as an output overriding the default output pin state. 
Fc9-void-icon.png - VOID Return


SetDutyCycle

Fc9-comp-macro.png SetDutyCycle
Sets the PWM duty cycle in terms of on/off based on the current period setting. E.g. if period = 255 then duty of 128 is equal to 50% on and 50% off. 16-bit PIC users should use the 10bit duty function to access the full range. 
Fc9-u8-icon.png - BYTE Duty
8-bit PWM duty 0-255 
Fc9-void-icon.png - VOID Return


SetDutyCycle10Bit

Fc9-comp-macro.png SetDutyCycle10Bit
PIC/AVR - Sets the full scale PWM duty cycle based on the current period setting. If period = 255 then Duty of 512 is equal to 50%. 16-bit PICs have a 16-bit period range available. If period = 65535 then Duty of 32768 is equal to 50%. 
Fc9-u16-icon.png - UINT Duty
PWM duty PIC/AVR: 0-1023 16-bit PIC: 0-65535 
Fc9-void-icon.png - VOID Return


SetFrequency

Fc9-comp-macro.png SetFrequency
Sets a PWM of the specifed frequency at a duty of 50% Ideal use is a frequency generator 
Fc9-u32-icon.png - ULONG Frequency
Enter frequency in Hz 
Fc9-void-icon.png - VOID Return


Property reference

Fc9-prop-icon.png Properties
Fc9-conn-icon.png Connections
Fc9-type-16-icon.png Channel
Selects which PWM channel the component is connected to. 
Fc9-type-7-icon.png Alternative pin
Allows an alternate pin to be used if available. Note that on some devices you will also have to change this setting in the device configuration. 
Fc9-type-5-icon.png PWM Pin
Specifies the pin assigned to the PWM channel selected 
Fc9-type-16-icon.png Remap Pin
Allows the PWM hardware pin to be reassigned to another pin 
Fc9-conn-icon.png PWM Frequency
Fc9-type-16-icon.png PWM Timer
Timer associated with PWM to drive the output. Warning - All PWM channels linked to the same timer will share the same period and prescaler settings. 
Fc9-type-21-icon.png Period Overflow
Allows the user to change the number of counts for the whole PWM period. Note that all PWM channels based on the same timer will share the same period overflow. PIC/AVR Range: 0 - 255 16-bit PIC Range: 0 - 65535 
Fc9-type-16-icon.png Prescaler
Allows the user to change the number of program cycles per PWM cycle count. Note that all PWM channels based on the same timer will share the same prescaler. 
Fc9-type-15-icon.png Period (us)
Displays the length of time to complete one PWM cycle. 
Fc9-type-15-icon.png Frequency (Hz)
 
Fc9-type-15-icon.png Frequency (KHz)
Displays the frequency of PWM cycles per second. 
Fc9-conn-icon.png Calculations
Fc9-type-15-icon.png Required Frequency (Hz)
Type in your required frequency in Hz and the component will automatically calculate the best prescaler and period to acheive the frequency with the maximum possible resolution. 
Fc9-type-15-icon.png Calculated Frequency (Hz)
The frequency we have ended up acheiving using the calculated period and prescaler 
Fc9-type-21-icon.png Calculated Period
The suggested period setting to use to acheive the calculated frequency. 
Fc9-type-21-icon.png Calculated Prescaler
The suggested prescaler setting to use to acheive the calculated frequency. 
Fc9-type-7-icon.png Apply To Defaults
Applies the calculated period and prescaler settings to the PWM component default settings. 
Fc9-conn-icon.png Simulation
Fc9-type-16-icon.png Representation
Edits how the PWM is shown on the simulation panel. 

Component Source Code

Please click here to download the component source project: FC_Comp_Source_PWM_Output.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_PWM_Output.fcfx

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