buzzer pwm&power

[FormerMember]

I want to use the pwm to control buzzer, but when I use init function, the power will increase 880 uA, how to decrease the power.

void beep_on(void)//beep on
{
	  app_pwm_channel_duty_set(&PWM1, 0, warning_voice);
}

void beep_off(void)
{
		app_pwm_channel_duty_set(&PWM1, 0, 0);  
}

void beep_on_on(void)
{
		beep_pwm_init();
}
void beep_off_off(void)
{
	  app_pwm_uninit(&PWM1);//in this 
		nrf_gpio_cfg_output(BEEP);							
		nrf_gpio_pin_clear(BEEP);
}
bool ready_flag1=0;
void pwm1_ready_callback(uint32_t pwm_id)    // PWM callback function
{
    ready_flag1 = true;
}
void beep_pwm_init(void)
{
		app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(260,BEEP);//(250L,1,9);//
		pwm1_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_HIGH;
	  app_pwm_init(&PWM1,&pwm1_cfg,pwm1_ready_callback);
    app_pwm_enable(&PWM1);
		app_pwm_channel_duty_set(&PWM1, 0, 0);
}

1、first, I use beep_pwm_init() before for(;;), and the testing instrument display the power is increase 880uA. and then, I use beep_on() and beep_off() to start or stop the buzzer. and the connection is good, not always disconnected.

2、I use another way. I use beep_on_on() function when I want the buzzer work, and when I want the buzzer off, I use the beep_off_off(), the power is decreased, but the connection is no longer stable.

please help me to over come this question, thanks.

[FormerMember]

the buzzer I need to control it not just on and off, I should change the duty to control the volume

[Ole Bauck]

You can make a function for calulating the ticks from us, see this post. Remeber that if you set the period low you will have lower resolution on the duty cycle. For example if you set the period to 60us you will have three options for duty cycle: 0%, 50% and 100%.

The low power pwm module should almost not consume any current (1uA for the LFCLK+RTC). How much current are you seeing? It may be something else in your code that is causing the high current draw.