robert-hh 7775523b2d esp32/machine_pwm: Verify PWM is active when config methods are called.
Checks are added for pwm.freq(), pwm_duty(), pwm_duty_u10() and
pwm.duty_u16().  This avoids a core dump on ESP32C3, and misleading error
messages on Xtensa ESP32 devices.
2022-10-31 11:54:46 +11:00
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