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app_timer_cnt_get returning zero on nrf52832

Hi,

I am getting only two values on startup and the remaining values as zero when using app_timer_cnt_get. EDIT: updated entire main.c file

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "app_button.h"
#include "ble_nus.h"
#include "app_uart.h"
#include "app_util_platform.h"
#include "bsp.h"
#include "bsp_btn_ble.h"
#include "nrf_delay.h"
#include "MPU6050.h"
#include <stdlib.h>
#include "nrf_drv_gpiote.h"

#define PIN_IN 11
//============================================
// MAX30100 functions
void PulseOximeter_begin();
void begin(void);
void setMode(enum Mode mode);
void setLedsPulseWidth(enum LEDPulseWidth ledPulseWidth);
void setSamplingRate(enum SamplingRate samplingRate);
void setLedsCurrent(enum LEDCurrent irLedCurrent, enum LEDCurrent redLedCurrent);
void setHighresModeEnabled(bool enabled);
void readMaxFIFO(void);
void SetMaxInterrupt(uint8_t interrupt_mode);
uint32_t millis(void);
//================================================
static uint8_t sample_flag=0;
uint8_t readRegister(uint8_t device_Id,uint8_t address,uint8_t length);
void writeRegister(uint8_t device_Id,uint8_t address,uint8_t data);
float obj_temp=0.0;
float amb_temp =0.0;
uint8_t Obj_temp[10];
uint8_t Amb_temp[10];
uint8_t read_data[4];

nrf_drv_twi_t twi_instance = NRF_DRV_TWI_INSTANCE(0);
typedef struct
{
    uint8_t  x;
    uint8_t  y;
    uint8_t  z;
	  uint8_t w;
  //  uint8_t tilt;
} sample_t;

static sample_t  m_sample;
/*UART buffer size. */
float TemperatureFahrenheit(float celcius);
float receiveTemperature(sample_t *p_new_sample);

uint8_t device_address = 0; // Address used to temporarily store the current address being checked
bool device_found = false; 
bool read_flag=false;
static volatile bool m_xfer_done =true;
uint8_t num_of_bytes_to_read=1;

#define IS_SRVC_CHANGED_CHARACT_PRESENT 0                                           /**< Include the service_changed characteristic. If not enabled, the server's database cannot be changed for the lifetime of the device. */

#define CENTRAL_LINK_COUNT              0                                           /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
#define PERIPHERAL_LINK_COUNT           1                                           /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/

#define DEVICE_NAME                     "Waferchips"                               /**< Name of device. Will be included in the advertising data. */
#define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_VENDOR_BEGIN                  /**< UUID type for the Nordic UART Service (vendor specific). */

#define APP_ADV_INTERVAL                64                                          /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS      180                                         /**< The advertising timeout (in units of seconds). */

#define APP_TIMER_PRESCALER             0                                           /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE         4                                           /**< Size of timer operation queues. */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY                   0                                           /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER)  /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */

#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */

static ble_nus_t                        m_nus;                                      /**< Structure to identify the Nordic UART Service. */
static uint16_t                         m_conn_handle = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */

static ble_uuid_t                       m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};  /**< Universally unique service identifier. */


/**@brief Function for assert macro callback.
 *
 * @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 analyse 
 *          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] p_file_name File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}


/**@brief Function for the GAP initialization.
 *
 * @details This function will set up all the necessary GAP (Generic Access Profile) parameters of 
 *          the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
    
    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *) DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the data from the Nordic UART Service.
 *
 * @details This function will process the data received from the Nordic UART BLE Service and send
 *          it to the UART module.
 *
 * @param[in] p_nus    Nordic UART Service structure.
 * @param[in] p_data   Data to be send to UART module.
 * @param[in] length   Length of the data.
 */
/**@snippet [Handling the data received over BLE] */
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    for (uint32_t i = 0; i < length; i++)
    {
        while(app_uart_put(p_data[i]) != NRF_SUCCESS);
    }
    while(app_uart_put('\n') != NRF_SUCCESS);
}
/**@snippet [Handling the data received over BLE] */


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    uint32_t       err_code;
    ble_nus_init_t nus_init;
    
    memset(&nus_init, 0, sizeof(nus_init));

    nus_init.data_handler = nus_data_handler;
    
    err_code = ble_nus_init(&m_nus, &nus_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling an event from the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module
 *          which are passed to the application.
 *
 * @note All this function does is to disconnect. This could have been done by simply setting
 *       the disconnect_on_fail config parameter, but instead we use the event handler
 *       mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    uint32_t err_code;
    
    if(p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for handling errors from the Connection Parameters module.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    uint32_t               err_code;
    ble_conn_params_init_t cp_init;
    
    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;
    
    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}


/**@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 advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;
        case BLE_ADV_EVT_IDLE:
         //   sleep_mode_enter();
            break;
        default:
            break;
    }
}


/**@brief Function for the application's SoftDevice event handler.
 *
 * @param[in] p_ble_evt SoftDevice event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t                         err_code;
    
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            break;
            
        case BLE_GAP_EVT_DISCONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_IDLE);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            break;

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported
            err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break;

        default:
            // No implementation needed.
            break;
    }
}


/**@brief Function for dispatching a SoftDevice event to all modules with a SoftDevice 
 *        event handler.
 *
 * @details This function is called from the SoftDevice event interrupt handler after a 
 *          SoftDevice event has been received.
 *
 * @param[in] p_ble_evt  SoftDevice event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_nus_on_ble_evt(&m_nus, p_ble_evt);
    on_ble_evt(p_ble_evt);
    ble_advertising_on_ble_evt(p_ble_evt);
    bsp_btn_ble_on_ble_evt(p_ble_evt);
    
}


/**@brief Function for the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;
    
    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;
    
    // Initialize SoftDevice.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);
    
    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);
        
    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);
    // Enable BLE stack.
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);
    
    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_t err_code;
    switch (event)
    {
        case BSP_EVENT_SLEEP:
        //    sleep_mode_enter();
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            err_code = ble_advertising_restart_without_whitelist();
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        default:
            break;
    }
}


/**@brief   Function for handling app_uart events.
 *
 * @details This function will receive a single character from the app_uart module and append it to 
 *          a string. The string will be be sent over BLE when the last character received was a 
 *          'new line' i.e '\n' (hex 0x0D) or if the string has reached a length of 
 *          @ref NUS_MAX_DATA_LENGTH.
 */
/**@snippet [Handling the data received over UART] */
void uart_event_handle(app_uart_evt_t * p_event)
{
    static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
    static uint8_t index = 0;
    uint32_t       err_code;

    switch (p_event->evt_type)
    {
        case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;

            if ((data_array[index - 1] == '\n') || (index >= (BLE_NUS_MAX_DATA_LEN)))
            {
                err_code = ble_nus_string_send(&m_nus, data_array, index);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
                
                index = 0;
            }
            break;

        case APP_UART_COMMUNICATION_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_communication);
            break;

        case APP_UART_FIFO_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_code);
            break;

        default:
            break;
    }
}
/**@snippet [Handling the data received over UART] */


/**@brief  Function for initializing the UART module.
 */
/**@snippet [UART Initialization] */
static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_ENABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud115200
    };

    APP_UART_FIFO_INIT( &comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOW,
                       err_code);
    APP_ERROR_CHECK(err_code);
}
/**@snippet [UART Initialization] */


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    ble_advdata_t scanrsp;

    // Build advertising data struct to pass into @ref ble_advertising_init.
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = false;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    memset(&scanrsp, 0, sizeof(scanrsp));
    scanrsp.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    scanrsp.uuids_complete.p_uuids  = m_adv_uuids;

    ble_adv_modes_config_t options = {0};
    options.ble_adv_fast_enabled  = BLE_ADV_FAST_ENABLED;
    options.ble_adv_fast_interval = APP_ADV_INTERVAL;
    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@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 TWI events handler.
 */
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{   
	
	uint8_t err_code,i;
    switch(p_event->type)
    {
        case NRF_DRV_TWI_EVT_DONE:
            // If EVT_DONE (event done) is received a device is found and responding on that particular address
  //          printf("\r\n!****************************!\r\nDevice found at 7-bit address: %#x!\r\n!****************************!\r\n\r\n", device_address);
            
						if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_TX)
            {
							  device_found = true;
                m_xfer_done=false;
                /* Read 4 bytes from the specified address. */
							if(read_flag==1){
								
                 nrf_drv_twi_rx(&twi_instance, 0x57, (uint8_t*)&m_sample, num_of_bytes_to_read );// sizeof(m_sample));
							}
      //          printf("\r\n%d",m_sample.x);
		//					 printf(" %d ",m_sample.y);
			//				 printf(" %d\r\n ",m_sample.z);
							 
            }
						else{
			//				printf("m_xfer_true\r\n");
						//	obj_temp=receiveTemperature(&m_sample);
					//		sprintf(Obj_temp,"%.2f",obj_temp);
						//	device_found = true;
							m_xfer_done =true;
						}
            break;
        case NRF_DRV_TWI_EVT_ADDRESS_NACK:
            printf("No address ACK on address: %#x!\r\n", device_address);
            break;
        case NRF_DRV_TWI_EVT_DATA_NACK:
            printf("No data ACK on address: %#x!\r\n", device_address);
            break;
        default:
            break;        
    }   
}

/**@brief Function for placing the application in low power state while waiting for events.
 */
static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);
}

/**
 * @brief UART initialization.
 */
void twi_init (void)
{
    ret_code_t err_code;
    
    const nrf_drv_twi_config_t twi_config = {
       .scl                = DEVICE_SCL_PIN,
       .sda                = DEVICE_SDA_PIN,
       .frequency          = NRF_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH
    };
    
    err_code = nrf_drv_twi_init(&twi_instance, &twi_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);
    
    nrf_drv_twi_enable(&twi_instance);
}

void start_clock(void)
{
    NRF_CLOCK->LFCLKSRC             = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
    NRF_CLOCK->EVENTS_LFCLKSTARTED  = 0;
    NRF_CLOCK->TASKS_LFCLKSTART     = 1;
    while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0)
    {
        // Do nothing.
    }
    NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
}

void timer_handler(void * p_context)
{   
	
	uint8_t err_code,i;
      
}

void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
  //  nrf_drv_gpiote_out_toggle(25);
	  sample_flag = 1;	
}
static void gpio_init(void)
{
    ret_code_t err_code;
    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);

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

    err_code = nrf_drv_gpiote_in_init(PIN_IN, &in_config, in_pin_handler);
    APP_ERROR_CHECK(err_code);
	
    nrf_drv_gpiote_in_event_enable(PIN_IN, true);
}
/**@brief Application main function.
 */
float MPU6050_Acc[3] = {0};
char PrintBuffer[100] = {0};
int main(void)
{
    uint32_t err_code;
    bool erase_bonds;
		uint16_t length = 0;
    // Initialize.	
		nrf_gpio_cfg_output(25);
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    uart_init();
    gpio_init();
    buttons_leds_init(&erase_bonds);
    ble_stack_init();
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();
		
    printf("\r\nUART Start!\r\n");
    err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);
     twi_init();
	
	
// writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_MODE_CONFIGURATION,DEFAULT_MODE);  // configuring MAX30100_REG_MODE_CONFIGURATION TO DEFAULT MODE(0X02);

    PulseOximeter_begin();
    uint8_t dummy_data[] = {1};
		uint32_t dummy_char =0x0000;
    uint32_t ticks1,ticks2,ti;
    uint8_t max_read_reg = 0;
    max_read_reg =MAX30100_REG_MODE_CONFIGURATION;
	float seconds_elapsed;
    // Enter main loop.
		max_read_reg=0;//MAX30100_REG_INTERRUPT_ENABLE;
    for (;;)
    {
			
      //      app_timer_cnt_get(&ticks1);
            ticks1 =  millis();
            nrf_delay_ms(100);
       //        app_timer_cnt_get(&ticks2);
      			ticks2 = millis();
            app_timer_cnt_diff_compute(ticks2,ticks1,&ti);
			
		//	dummy_char=readRegister(MAX30100_DEVICE_ID,max_read_reg,1);
                sprintf(Amb_temp,"T=%d",ticks1);
                err_code = ble_nus_string_send(&m_nus, Amb_temp, 9);    
                    
                 nrf_delay_ms(900);

  //  dummy_char=readRegister(MAX30100_DEVICE_ID,max_read_reg,1);
			/*
if(sample_flag==1){
	sample_flag=0;
			//////////////////////////////////////////////////
   	readMaxFIFO();
    dummy_char = (m_sample.x << 8) | m_sample.y;
		sprintf(Obj_temp,"I=%d",dummy_char);
		err_code = ble_nus_string_send(&m_nus, Obj_temp, 8);
		nrf_delay_ms(150);
		dummy_char = (m_sample.z<<8)|m_sample.w;
		sprintf(Obj_temp,"R=%d",dummy_char);
		err_code = ble_nus_string_send(&m_nus, Obj_temp, 8);
		nrf_delay_ms(150);
			////////////////////////////////////////////////////////////
}
*/
//		APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
		/*
		max_read_reg =MAX30100_REG_SPO2_CONFIGURATION;
    dummy_char=readRegister(MAX30100_DEVICE_ID,max_read_reg,1);

		sprintf(Obj_temp,"S=%d",dummy_char);
		err_code = ble_nus_string_send(&m_nus, Obj_temp, 5);
		nrf_delay_ms(1000);
       
	*/
			
			
				
 //       power_manage();
    }
}


/** 
 * @}
 */
 /****************************************************************
	 * Function Name: Temperature_calculation
	 * Description: receive and print out temperature in Celcius and fahrenheit
	 * Parameters: Temperature_type- choose ambient or object Temperature
	 * Return:  true for ok, false for failure
	****************************************************************/
	float receiveTemperature(sample_t *p_new_sample) {
		
		
		uint8_t temp;
//		int dev = (DEVICE_ADDR << 1);                               // 5B is the device address
		uint8_t dataLow = 0;                              // initially setting data low as zero
	    uint8_t dataHigh = 0;                             // initially setting data high as zero
//		char pec = 0;
		float celcius = 0.0;

		// This combines high and low bytes together and processes temperature, MSB is a error bit and is ignored for temps
		double resolutionFactor = 0.02;                // resolution factor of the MLX90614
		double temperature = 0x0000; 
		int frac;                                      // data past the decimal point

		dataHigh=p_new_sample->y;
		dataLow=p_new_sample->x;
		temperature = (double)(((dataHigh & 0x007F) << 8) | dataLow); // removes error bit of high byte by shifting and adds the low byte 
		temperature= (temperature * resolutionFactor) ;//- 0.01;         // multiplying temperature value with resolutionFactor 
    celcius = (float)(temperature)- 273.15;
	//printf("Temp= %f \r\n",TemperatureFahrenheit(celcius));
	
		return celcius;                                               // return the value of temperature in celcius
			
	}
/*
	* convert temperature in celsius to fahrenheit
	*/
	float TemperatureFahrenheit(float celcius){                       // convert celcius into fahrenheit      
		return (celcius*1.8) + 32;                                    // returns fahrenheit = (celcius*1.8) + 32;
	}
	
	
	void writeRegister(uint8_t device_id,uint8_t address,uint8_t data){
		
		uint8_t w2_dat[6], i;
	
	//configuring default mode
	w2_dat[0]= address; //0x06
	w2_dat[1] =data;   //0x02
	
	device_found=false;
	nrf_drv_twi_tx(&twi_instance, device_id, w2_dat, 2, false);
	while(device_found == false);
	}
	
uint8_t readRegister(uint8_t device_Id,uint8_t address,uint8_t length){
	uint8_t err_code,High,Low,ret_data;
	num_of_bytes_to_read = length;
	
	m_xfer_done=false;	
	
		
	double temp_data=0;
	read_flag=1;
		 err_code=nrf_drv_twi_tx(&twi_instance, device_Id, &address, sizeof(address), true);   // sending register
	//	printf("Error code=%d \r\n",err_code);
		do{
			__WFE();
		}while(m_xfer_done==false);
		read_flag=0;
		
	//	read_data[0] = m_sample.x;
	//	read_data[1] = m_sample.y;
	//	read_data[2] = m_sample.z;
	//	read_data[3] = m_sample.w;
		
		ret_data = m_sample.x;
		return ret_data;
		
}


void readMaxFIFO(void){
	uint8_t err_code,regAdd,Low;
	uint32_t ret_data;
	
	m_xfer_done=false;	
	num_of_bytes_to_read=4;
		regAdd =0x05;
	double temp_data=0;
	read_flag=1;
		 err_code=nrf_drv_twi_tx(&twi_instance, MAX30100_DEVICE_ID, &regAdd, sizeof(regAdd), true);   // sending register
	//	printf("Error code=%d \r\n",err_code);
		do{
			__WFE();
		}while(m_xfer_done==false);
		read_flag=0;
		
		
}

void PulseOximeter_begin()
{
	
  //debuggingMode = debuggingMode_;						// ?
    begin();
    setMode(MAX30100_MODE_SPO2_HR);      //MAX30100_MODE_SPO2_HR  //MAX30100_MODE_HRONLY
    setLedsCurrent(IR_LED_CURRENT, RED_LED_CURRENT_START);    // (50mA,27.1mA)
//    irDCRemover = DCRemover(DC_REMOVER_ALPHA);				  // filter	
//    redDCRemover = DCRemover(DC_REMOVER_ALPHA);				  // filter
//    state = PULSEOXIMETER_STATE_IDLE;                         // ???  
	SetMaxInterrupt(MAX30100_IE_ENB_SPO2_RDY);
	SetMaxInterrupt(MAX30100_IE_ENB_HR_RDY);
	SetMaxInterrupt(MAX30100_IE_ENB_TEMP_RDY);
	SetMaxInterrupt(MAX30100_IE_ENB_A_FULL);
	
	
}


void begin(void)
{
    setMode(DEFAULT_MODE);                                     			//Default mode is MAX30100 as HR mode ONLY
    setLedsPulseWidth(DEFAULT_PULSE_WIDTH);					   			// 1600	
    setSamplingRate(DEFAULT_SAMPLING_RATE);					   			// 100HZ 	
    setLedsCurrent(DEFAULT_IR_LED_CURRENT, DEFAULT_RED_LED_CURRENT);    // 50mA
    setHighresModeEnabled(true);
}

void setMode(enum Mode mode)
{
    writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_MODE_CONFIGURATION, mode);
}

void setLedsPulseWidth(enum LEDPulseWidth ledPulseWidth)
{
    uint8_t previous = readRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION,1);
    writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION, (previous & 0xFC) | ledPulseWidth);
}

void setSamplingRate(enum SamplingRate samplingRate)
{
    uint8_t previous = readRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION,1);
    writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION, (previous & 0xE3) | (samplingRate << 2));
}

void setLedsCurrent(enum LEDCurrent irLedCurrent, enum LEDCurrent redLedCurrent)
{
    writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_LED_CONFIGURATION, redLedCurrent << 4 | irLedCurrent);
}

void setHighresModeEnabled(bool enabled)
{
    uint8_t previous = readRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION,1);
    if (enabled) {
        writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION, previous | MAX30100_SPC_SPO2_HI_RES_EN);
    } else {
        writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_SPO2_CONFIGURATION, previous & ~MAX30100_SPC_SPO2_HI_RES_EN);
    }
}

void SetMaxInterrupt(uint8_t interrupt_mode){

	uint8_t previous = readRegister(MAX30100_DEVICE_ID,MAX30100_REG_INTERRUPT_ENABLE,1);
  writeRegister(MAX30100_DEVICE_ID,MAX30100_REG_INTERRUPT_ENABLE, (previous & 0xFF) | interrupt_mode);
}

uint32_t millis(void){
	uint32_t count;
	count = NRF_RTC0->COUNTER;

	
	return (count/32);
}

please help.

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