Monitor PIN change

[Amit]

I am new to NRF52832. I want to monitor continuously PIN 3 where I have connected USB to check whether my USB is connected or not. How can I do that. Please reply ASAP.

[ved]

Hi..Amit

first define PIN 3 and After that ,create timer instance for repeated mode and start it.

then initalize , configure nrf_drv_gpiote_init driver based on ur configuration and enable input event on it.

for more information u can look at example pin_change_int in SDK example folder.

Regards.

[Amit]

Hi Thanks for the prompt reply. I had looked into the example and what I can find out is in any of the case whether the PIN 3 changes from Low to High or High to Low the control goes to the in_pin_handler function. How can I trace whether the PIN has gone to low to high or high to low? Sorry for asking simple question but I am new.

Regards, Amit

[ved]

it is very simple. just configure "sense" in nrf_drv_gpiote_in_config_t struct. then it will generate event when change.

[Amit]

I had configured "sense" but the issue i am facing is it is either sensing Low to High or High to Low not both

[Amit]

The code I am using is as follows-

int x=-99;

void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action) { //nrf_drv_gpiote_out_toggle(PIN_OUT); nrf_drv_gpiote_in_config_t in_config1;

if( in_config1.sense == NRF_GPIO_PIN_SENSE_HIGH)
{
    LEDS_OFF(1 << 17);
    LEDS_ON(1 << 18);
}
else if ( in_config1.sense == NRF_GPIO_PIN_SENSE_LOW)
{
    LEDS_OFF(1 << 18);
    LEDS_OFF(1 << 17);
}

// if( (nrf_gpio_pins_read() & (1 << 3)) == NRF_GPIO_PIN_SENSE_LOW) // { // LEDS_OFF(1 << 17); // LEDS_ON(1 << 18); // } //
//
// if( (nrf_gpio_pins_read() & (1 << 3)) == NRF_GPIO_PIN_SENSE_HIGH) // { // LEDS_OFF(1 << 17); // LEDS_OFF(1 << 18);
// } //
//
//
//

} /**

• @brief Function for configuring: PIN_IN pin for input, PIN_OUT pin for output,

• and configures GPIOTE to give an interrupt on pin change. */ static void gpio_init(void) { ret_code_t err_code;

  err_code = nrf_drv_gpiote_init(); APP_ERROR_CHECK(err_code);

  nrf_drv_gpiote_out_config_t out_config = GPIOTE_CONFIG_OUT_SIMPLE(false);

  err_code = nrf_drv_gpiote_out_init(PIN_OUT, &out_config); APP_ERROR_CHECK(err_code);

  nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true); in_config.pull = NRF_GPIO_PIN_PULLUP;

  err_code = nrf_drv_gpiote_in_init(3, &in_config, in_pin_handler); APP_ERROR_CHECK(err_code);

  nrf_drv_gpiote_in_event_enable(3, true); }

/**

• @brief Function for application main entry. */ int main(void) { LEDS_CONFIGURE(LEDS_MASK); gpio_init();

  while (true) {

  } }

/** @} */