Unable to trigger bsp_event_handler when press button

Question

I am writing a program that waits for Button 1 to be pressed. Once it is press, then it will call the function blecomm() in another c file. My code is as below:

#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "app_error.h"
#include "boards.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "bsp.h"
#include "bsp_btn_ble.h"
#include "sensorsim.h"
#include "nrf_gpio.h"
#include "nrf_error.h"

#define NRF_LOG_MODULE_NAME "APP"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "SEGGER_RTT.h"

#define NRF_LOG_USES_RTT 1      	



#define DEVICE_NAME                     "Main"                          
#define MANUFACTURER_NAME               "NordicSemiconductor"                      

#define APP_TIMER_PRESCALER             0                                           /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE         4                                           /**< Size of timer operation queues. */
#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

void blecomm();



/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module. This creates and starts application timers.
 */
static void timers_init(void)
{
    // Initialize timer module.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
}



/**@brief Function for putting the chip into sleep mode.
 *
 * @note This function will not return.
 */
static void sleep_mode_enter(void)
{
    uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);

    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}



/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated when button is pressed.
 */
static void bsp_event_handler(bsp_event_t event)
{
	SEGGER_RTT_printf(0, "bsp_event_handler function");
    switch (event)
    {
        case BSP_EVENT_SLEEP:
            sleep_mode_enter();
            break; // BSP_EVENT_SLEEP

        case BSP_EVENT_KEY_0:
        	SEGGER_RTT_printf(0, "Button 1 is pressed!\n");
        	blecomm();
            break;

        case BSP_EVENT_KEY_1:
        	SEGGER_RTT_printf(0, "Button 2 is pressed!\n");
        	break;
        default:
            break;
    }
}


/**@brief Function for initializing buttons and leds.
 *
 * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
 */
static void buttons_leds_init(bool * p_erase_bonds)
{
    bsp_event_t startup_event;

    uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,
                                 APP_TIMER_TICKS(100, APP_TIMER_PRESCALER),
                                 bsp_event_handler);

    APP_ERROR_CHECK(err_code);

    err_code = bsp_btn_ble_init(NULL, &startup_event);
    APP_ERROR_CHECK(err_code);

    *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}



/**@brief Function for application main entry.
 */
int main(void)
{
    uint32_t err_code;
    bool     erase_bonds;

    // Initialize.
    err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    timers_init();
    buttons_leds_init(&erase_bonds);
    SEGGER_RTT_printf(0, "Template started\r\n");
    nrf_gpio_pin_toggle(LED_1);


    // Enter main loop.
    while(true){
    	 SEGGER_RTT_printf(0, "in loop \n");
        if (NRF_LOG_PROCESS() == false)
        {
            SEGGER_RTT_printf(0, "false\n");
        } else{
        	SEGGER_RTT_printf(0, "true\n");
        }
    }

//    for(;;){
//    	SEGGER_RTT_printf(0, "for loop\n");
//    }
}

When running this, it enters the while loop but when I press Button 1 on Nordic nRF51dk, it does not enter into the 'bsp_event_handler' function. What am I doing wrong here?

(Function blecomm() needs to be triggered upon Button 1 press)

I am using S130 with nRF51DK and Eclipse IDE.