pwm General PWM Example

A test of a PWM device driver. It simply enables a pulsed output for a specified frequency and duty for a specified period of time. This example can ONLY be built as an NSH built-in function.

This test depends on these specific PWM/NSH configurations settings (your specific PWM settings might require additional settings).

  • CONFIG_PWM – Enables PWM support.

  • CONFIG_PWM_PULSECOUNT – Enables PWM pulse count support (if the hardware supports it).

  • CONFIG_NSH_BUILTIN_APPS – Build the PWM test as an NSH built-in function.

Specific configuration options for this example include:

  • CONFIG_EXAMPLES_PWM_DEVPATH – The path to the default PWM device. Default: /dev/pwm0.

  • CONFIG_EXAMPLES_PWM_FREQUENCY – The initial PWM frequency. Default: 100 Hz

  • CONFIG_EXAMPLES_PWM_DUTYPCT – The initial PWM duty as a percentage. Default: 50%.

  • CONFIG_EXAMPLES_PWM_DURATION – The initial PWM pulse train duration in seconds. Used only if the current pulse count is zero (pulse count is only supported if CONFIG_PWM_PULSECOUNT is defined). Default: 5 seconds.

  • CONFIG_EXAMPLES_PWM_PULSECOUNT – The initial PWM pulse count. This option is only available if CONFIG_PWM_PULSECOUNT is non-zero. Default: 0 (i.e., use the duration, not the count).