is there any complete code for LPCOM + SAADC working same time?

[Shahrear]

Hello, i am working on a rotation counter, i am using adc and LPCOM with nrf52832 DK board. but LPCOM code is not working.

static void lpcomp_event_handler(nrf_lpcomp_event_t event)
{
	// Clear event
   if (event == NRF_LPCOMP_EVENT_CROSS)
    {
     
       rotation_int++;
    }
  
	
	// Toggle pin to indicate triggering of event
	
}

/**
 * @brief Initialize LPCOMP driver.
 */
void LPCOMP_init(void)
{	
	
	
	 uint32_t err_code;


    // initialize LPCOMP driver, from this point LPCOMP will be active and provided
    // event handler will be executed when defined action is detected
    err_code = nrf_drv_lpcomp_init(NULL, lpcomp_event_handler);
    APP_ERROR_CHECK(err_code);
    nrf_drv_lpcomp_enable();
}

[Shahrear]

after i inject one pulse the toggle pin output like this. yellow line is lpcomp input and cyne color line is toggle pin output

static void lpcomp_event_handler(nrf_lpcomp_event_t event)

{

if (event == NRF_LPCOMP_EVENT_UP)
{
   
   int_rotate++;
	
	 nrf_gpio_pin_toggle(6);
	 
	
}
 
	

}

[Jørgen Holmefjord]

What have you configured as reference? And what level is the pulse at? How many events are generated?

[Shahrear]

as reference its VDD*4/8. where VDD is 3V. those pulse are 3V peak to peak and total 84 events are generated. i am getting mad.

[Jørgen Holmefjord]

Most likely there is noise on the signal, making it cross the reference mulitple times. How do you apply the signal? Have you tried using a GPIO of the chip to set the output high/low? I see only 1 event when using GPIO, but multiple events if using jumper cable from input to VDD/GND.

[Shahrear]

the signal comes from one encoder ic which give sawtooth output.and its one teeth for one revulation. there are some noise but its 50mv peak to peak.

[Jørgen Holmefjord]

Try enabling hysteresis:

config.hal.hyst = NRF_LPCOMP_HYST_50mV;