NRF52840 LATCH always set no matter which pin causes the wake up

Question

Hi I'm using the PCA10056 DK and ran into an issue. I can configure the nrf52 to wake up using input pins(although some pins can't wake it up for some reason), however, when it wakes up, all the bits that correspond to pins that can wake up the MCU is set no matter which pin actually causes it. I have attached my source code below:

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#include <stdint.h>

#include "app_error.h"
#include "ble.h"

#include "ble_hci.h"
#include "fds.h"
#include "nordic_common.h"
#include "nrf.h"

#include "nrf_pwr_mgmt.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "nrf_sdh_soc.h"

#include "nrf_nvic.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"

#include "nrf_delay.h"

#include "ble_module.hpp"

#include "advertising_module.hpp"

#include "connection_module.hpp"

#include "gatt_module.hpp"

#include "gap_module.hpp"

#include "peer_manager_handler.h"
#include "pm_module.hpp"

#include "bms_module.hpp"
#include "qwr_module.hpp"

#include "bas_module.hpp"

#include "timetable_service_module.hpp"

#include "adc_module.hpp"

#include "power_module.hpp"

#include "computer_switch_module.hpp"

#include "rv3028.hpp"
#include "twi_module.hpp"

#include "state_machine.hpp"

#include "misc_module.hpp"
#include "nrf_log_default_backends.h"

/**@brief Callback function for asserts in the SoftDevice.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in]   line_num   Line number of the failing ASSERT call.
 * @param[in]   file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t* p_file_name) {
  NRF_LOG_FINAL_FLUSH();
  //!< Value used as error code on stack dump, can be used to identify stack location on
  //!< stack unwind.
  app_error_handler(0xDEADBEEF, line_num, p_file_name);
}

// TODO(khoi): Remove this after development is done
#pragma GCC diagnostic ignored "-Wunused-function"

// void testFunc() { SEGGER_SYSVIEW_RecordU32(0 + testModule.EventOffset, 5); }

// NOTE: SOME PINS CAN'T WAKE UP THE CPU
constexpr nrfx_gpiote_pin_t COMPUTER_SWITCH_PIN     = NRF_GPIO_PIN_MAP(0, 9);
constexpr nrfx_gpiote_pin_t USER_INPUT_PIN          = NRF_GPIO_PIN_MAP(0, 3);
constexpr nrfx_gpiote_pin_t RTC_INTERRUPT_INPUT_PIN = NRF_GPIO_PIN_MAP(0, 2);
constexpr nrfx_gpiote_pin_t RTC_TIME_STAMP_PIN      = NRF_GPIO_PIN_MAP(0, 10);
constexpr nrfx_gpiote_pin_t RESET_PIN               = NRF_GPIO_PIN_MAP(0, 13);

void configure_reset_pin() {
  nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false);
  in_config.pull                       = NRF_GPIO_PIN_PULLUP;

  const auto err_code = nrf_drv_gpiote_in_init(
      RESET_PIN, &in_config, [](nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action) {
        nrf_drv_gpiote_in_event_disable(RESET_PIN);
        ble::pm::delete_all_bonds_unsafe();
        sd_nvic_SystemReset();
      });
  APP_ERROR_CHECK(err_code);

  nrf_drv_gpiote_in_event_enable(RESET_PIN, true);
}

// APP_TIMER_DEF(m_timer_id);

int main(void) {
  {
    const auto err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
  }
  auto err_code = nrf_pwr_mgmt_init();
  APP_ERROR_CHECK(err_code);
  {
    const auto err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);
  }

  configure_reset_pin();

  // need to initialize but not call nrf_drv_gpiote_in_event_enable otherwise
  // latch clear doesn't seem to work
  {
    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false);
    in_config.pull                       = NRF_GPIO_PIN_PULLUP;
    const auto err_code = nrf_drv_gpiote_in_init(RTC_INTERRUPT_INPUT_PIN, &in_config, nullptr);
    APP_ERROR_CHECK(err_code);
    nrf_drv_gpiote_in_event_disable(RTC_INTERRUPT_INPUT_PIN);
  }
  {
    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false);
    in_config.pull                       = NRF_GPIO_PIN_PULLUP;
    const auto err_code = nrf_drv_gpiote_in_init(USER_INPUT_PIN, &in_config, nullptr);
    APP_ERROR_CHECK(err_code);
    nrf_drv_gpiote_in_event_disable(USER_INPUT_PIN);
  }
  if (nrf_gpio_pin_latch_get(USER_INPUT_PIN)) { NRF_LOG_INFO("user input latch set"); }
  if (nrf_gpio_pin_latch_get(RTC_INTERRUPT_INPUT_PIN)) { NRF_LOG_INFO("rtc interrupt latch set"); }
  if (nrf_gpio_pin_latch_get(RESET_PIN)) { NRF_LOG_INFO("reset latch set"); }

  NRF_GPIO->LATCH = NRF_GPIO->LATCH;

  // give the latch some time to clear
  NRF_LOG_INFO("Yo");
  NRF_LOG_INFO("Yo");
  NRF_LOG_INFO("Yo");
  NRF_LOG_INFO("Yo");
  NRF_LOG_FLUSH();

  while (nrf_gpio_pin_latch_get(USER_INPUT_PIN) ||
         nrf_gpio_pin_latch_get(RTC_INTERRUPT_INPUT_PIN)) {
    // make sure the latch is cleared
  }

  NRF_LOG_INFO("Preparing to Sleep");
  NRF_LOG_FLUSH();

  nrf_drv_gpiote_in_event_enable(RTC_INTERRUPT_INPUT_PIN, true);
  nrf_drv_gpiote_in_event_enable(USER_INPUT_PIN, true);

  {
    auto err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Fetch the start address of the application RAM.
    uint32_t ram_start;
    err_code = nrf_sdh_ble_default_cfg_set(1, &ram_start);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);

    NRF_SDH_BLE_OBSERVER(m_ble_observer, 3, nullptr, NULL);

    ble_opt_t opt;

    memset(&opt, 0x00, sizeof(opt));
    opt.common_opt.conn_evt_ext.enable = 1;

    err_code = sd_ble_opt_set(BLE_COMMON_OPT_CONN_EVT_EXT, &opt);
    APP_ERROR_CHECK(err_code);
  }

  sd_power_system_off();
  while (1) {
    // in debug mode, sleep is emulated
  }
}

/**
 * @}
 */