how to stop pwm and set pin to clear

[wuvo.leo]

Hi,all.i use pwm with sdk8.1 sample (SDK8.1\example\peripheral\pwm),my question is how to stop pwm and set the pin to low level? is my code correct? my pwm init code:

---

static uint32_t init_pwm(uint32_t perior,uint8_t pin)
 {	 
	 	uint32_t err_code = 0; 
    /* 2-channel PWM, 200Hz, output on DK LED pins. */
	  app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_1CH(perior, pin);
	 
	 pwm1_cfg.pin_polarity[0] = APP_PWM_POLARITY_ACTIVE_LOW;
    
    /* Initialize and enable PWM. */
    err_code = app_pwm_init(&PWM1,&pwm1_cfg,pwm_ready_callback);
    APP_ERROR_CHECK(err_code);

    return err_code;
}
------------------------------------------------------------------------------

pwm stop code:
void pwm_stop( void )
{
   app_pwm_disable(&PWM1);
}
----------------------------------------------------------------------------

pwm start code:
void pwm_start( void )
{   
   app_pwm_enable(&PWM1);
}

[Susheel Nuguru]

Hi wuvo, I have noticed that app_pwm library does not disable a GPIOTE config, which means that it does not free the pin from gpiote after you are done. I created a ticket for it for the team.

For your code you can do this.

1. before initializing pwm library, you configure the pin through gpio interface

   nrf_gpio_pin_dir_set(pin_number, NRF_GPIO_PIN_DIR_OUTPUT); nrf_gpio_pin_clear(pin_number);

2. Then you initialize PWM using app_pwm library, do your stuff

3. in your pwm_stop add three lines to it

   void pwm_stop( void ) { app_pwm_disable(&PWM1); nrf_drv_gpiote_out_task_disable(pin_number); nrf_gpio_cfg_output(pin_number) nrf_gpio_pin_clear(pin_number); }

Now as soon as the pin is freed by nrf_drv_gpiote_out_task_disable then gpio configuration will take into effect.

EDIT: 10.08.2015

PAN-73 workaround is enabled by default in app_pwm_init

PAN-73 workaround is disabled in app_pwm_uninit

This means there will be increase in power consumption (~50uA) if the PAN-72 workaround is enabled.

Check here

[wuvo.leo]

my device's current is about 7uA before call pwm_start(),and call it,current is about 300uA.