6. PWM Example

1. Overview

The K230 integrates two PWM hardware modules, each providing 3 output channels. These channels share a clock, but the duty cycle can be adjusted independently. Therefore, channels 0, 1, and 2 share one clock, while channels 3, 4, and 5 share another clock. The configuration of the output IO can be set through the IOMUX module.

2. Example

The following example demonstrates how to use the PWM interface for output control.

Example

from machine import PWM

# Initialize channel 0, set output frequency to 1 kHz, duty cycle to 50%, and enable it
pwm0 = PWM(0, 1000, 50, enable=True)

# Disable channel 0 output
pwm0.enable(False)

# Set channel 0 output frequency to 2 kHz
pwm0.freq(2000)

# Set channel 0 output duty cycle to 10%
pwm0.duty(10)

# Enable channel 0 output
pwm0.enable(True)

# Release channel 0
pwm0.deinit()

3. Code Explanation

1. Initialize PWM Channel:

   • Create a PWM object, specify the channel number (0 in this example), set the initial frequency to 1 kHz, the duty cycle to 50%, and immediately enable the output.

2. Disable PWM Output:

   • Call the enable(False) method to disable the output of channel 0, which might be necessary to temporarily stop signal output in some situations.

3. Adjust Frequency and Duty Cycle:

   • Use the freq(2000) method to change the output frequency of channel 0 to 2 kHz.

   • Use the duty(10) method to adjust the duty cycle to 10%.

4. Enable PWM Output:

   • Use the enable(True) method to re-enable the PWM output, starting to send signals with the new frequency and duty cycle.

5. Release Channel Resources:

   • Call the deinit() method to release the channel, which is usually done when the PWM functionality is no longer needed to free up resources.

Tip

For detailed interfaces and usage of the PWM module, please refer to the API documentation.