how to stop PWM

RE: how to stop PWM

Sigurd — Thu, 02 Mar 2017 12:54:12 GMT

Then you should looking into using a app_timer. Take a look at the Application Timer Tutorial. You should stop the PWM in the app_timer timeout handler. The ble_app_uart example already includes the app-timer. Here is some code snippets on how you can implement this.

APP_TIMER_DEF(m_pwm_timer_id);

// Timeout handler for the timer
static void timer_handler(void * p_context)
{
    // ADD CODE TO TURN OFF PWM
}

static void create_timer()
{   
    uint32_t err_code;

    // Create timers
    err_code = app_timer_create(&m_pwm_timer_id,
                                APP_TIMER_MODE_SINGLE_SHOT,
                                timer_handler);
    APP_ERROR_CHECK(err_code);
}



static void start_pwm_timer()
{
    uint32_t err_code;

    //ADD CODE TO START THE PWM. (app_pwm_enable() + set duty cycle)

    // Start timer, call the timout handler afte 2 sec
    err_code = app_timer_start(m_pwm_timer_id,
                                APP_TIMER_TICKS(2000, APP_TIMER_PRESCALER),
                                NULL);
    APP_ERROR_CHECK(err_code);
}

RE: how to stop PWM

saiteja — Thu, 02 Mar 2017 12:41:53 GMT

i want to run the PWM for 2 sec and then it should stop. how to do this with out using while(true)

RE: how to stop PWM

Sigurd — Thu, 02 Mar 2017 11:48:10 GMT

Hi,

You can disable the PWM instance using the function app_pwm_disable(), and uninitialize the PWM instance using app_pwm_uninit(). Note that your function "PWM_init" is will be stuck in the while(true) loop, constantly changing the duty cycle.