CHIP_IO.PWM

Import the PWM module as follows

  import CHIP_IO.PWM as PWM

For the CHIP, this requires the PWM0 DTBO loaded via the OverlayManager or other means. For the CHIP, PWM1 is unavaiable For the CHIP Pro, PWM0 and PWM1 are setup in the base DTB by default

toggle_debug()

Enable/Disable the Debug

Parameters

None
Examples
```
PWM.toggle_debug()
```

is_chip_pro()

Function to report to the calling script if the SBC is a CHIP or a CHIP Pro

Parameters

None
Returns

int - 1 for CHIP Pro, 0 for CHIP
Examples
```
is_chip_pro = PWM.is_chip_pro()
```

start(channel, duty_cycle=0.0, frequency=2000.0, polarity=0)

Start the Software PWM

Parameters

channel - pin for software PWM is configured duty_cycle - initial duty cycle of the PWM (optional) frequency - frequency of the PWM (optional) polarity - signal polarity of the PWM (optional)
Returns

None

Examples

PWM.start("PWM0")
PWM.start("PWM0", 37.0)
PWM.start("PWM0", 10.0, 500.0)
PWM.start("PWM0", 50.0, 1000.0, 1)

stop(channel)

Stop the PWM

Parameters

channel - pin PWM is configured
Returns

None
Examples
```
PWM.stop("PWM0")
```

set_duty_cycle(channel, duty_cycle)

Set the duty cycle of the PWM

Parameters

channel - pin PWM is configured duty_cycle - duty cycle of the PWM (0.0 to 100.0)
Returns

None
Examples
```
PWM.set_duty_cycle("PWM0", 25.0)
```

set_pulse_width_ns(channel, pulse_width_ns)

Set the width of the PWM pulse in nano seconds

Parameters

channel - pin PWM is configured pulse_width_ns - pulse width of the PWM in nanoseconds
Returns

None
Examples
```
PWM.set_pulse_width_ns("PWM0", 2500.0)
```

set_frequency(channel, frequency)

Set the frequency of the PWM in Hertz

Parameters

channel - pin software PWM is configured frequency - frequency of the PWM
Returns

None
Examples
```
PWM.set_frequency("PWM0", 450.0)
```

set_period_ns(channel, pulse_width_ns)

Set the period of the PWM pulse in nano seconds

Parameters

channel - pin PWM is configured period_ns - period of the PWM in nanoseconds
Returns

None
Examples
```
PWM.set_period_ns("PWM0", 130.0)
```

cleanup(channel)

Cleanup PWM. If not channel input, all PWM will be cleaned up

Parameters

channel - pin PWM is configured (optional)
Returns

None
Examples
```
PWM.cleanup()
PWM.cleanup("PWM0")
```

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