PWM can't output low level when it is idle.

Question

Hi， ncs v3.2.0，nRF54LM20-DK， I drive a buzzer. When the buzzer doesn't ring, I need a low level. I tried it according to the following method. I can't output a low level when pwm is idle. ①Change PWM_POLARITY_NORMAL to PWM_POLARITY_INVERTED，Pwm can't output low when it is idle. ② nrf_pwm_channel_idle_set(NRF_PWM21, 0, false); Pwm can't output low when it is idle. ③ void buzzer_off ( void ) function i had try pwm_set_dt ( & buzzer_pwm , PWM_PERIOD_2_7KHZ_NS , PWM_PERIOD_2_7KHZ_NS ); and pwm_set_dt(&buzzer_pwm, PWM_PERIOD_2_7KHZ_NS, 0);Pwm can't output low when it is idle. /* Code */ void buzzer_on(void) { if (!device_is_ready(buzzer_pwm.dev)) { LOG_ERR("PWM device not ready"); return; } int ret = pwm_set_dt(&buzzer_pwm, PWM_PERIOD_2_7KHZ_NS, PWM_PERIOD_2_7KHZ_NS / 2); if (ret < 0) { LOG_ERR("Failed to turn on buzzer: %d", ret); } else { LOG_INF("Buzzer ON (2.7KHz)"); } } void buzzer_off(void) { int ret = pwm_set_pulse_dt(&buzzer_pwm, 0); if (ret < 0) { LOG_ERR("Failed to turn off buzzer: %d", ret); } else { LOG_INF("Buzzer OFF"); } } /* overlay */ & pwm21 { status = "okay" ; pinctrl-0 = < & pwm21_default >; pinctrl-1 = < & pwm21_sleep >; pinctrl-names = "default" , "sleep" ; zephyr,pm-device-runtime-auto ; }; /omit-if-no-ref/ pwm21_default : pwm21_default { group1 { psels = < NRF_PSEL ( PWM_OUT0, 1, 23 )>; nordic,invert ; /* 添加这一行来反转极性 */ }; }; /omit-if-no-ref/ pwm21_sleep : pwm21_sleep { group1 { psels = < NRF_PSEL ( PWM_OUT0, 1, 23 )>; low-power-enable ; }; }; pwm_peripherals : pwm-peripherals { compatible = "pwm-leds" ; status = "okay" ; buzzer0: buzzer { pwms = < & pwm21 0 PWM_MSEC ( 20 ) PWM_POLARITY_INVERTED >; label = "Buzzer" ; }; };