volatile uint8_t data_rdy_flag = 0;

int main(void)
{
    uint32_t err_code;

    NRF_TIMER1->MODE = TIMER_MODE_MODE_Timer;   // Set the timer in Timer Mode.
    NRF_TIMER1->PRESCALER = 7;  // Prescaler 7 produces 125†000 Hz timer frequency => 1 tick = 8 us.
    NRF_TIMER1->BITMODE        = TIMER_BITMODE_BITMODE_16Bit;  // 16 bit mode.
    NRF_TIMER1->TASKS_CLEAR    = 1;                            // clear the task first to be usable for later.

    NRF_TIMER1->CC[0] = 125;
    NRF_TIMER1->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos);
    /* Create an Event-Task shortcut to clear TIMER1 on COMPARE[0] event. */
    NRF_TIMER1->SHORTS = (TIMER_SHORTS_COMPARE0_CLEAR_Enabled << TIMER_SHORTS_COMPARE0_CLEAR_Pos);

    err_code = sd_nvic_SetPriority(TIMER1_IRQn,APP_IRQ_PRIORITY_LOW);
    APP_ERROR_CHECK(err_code);
    err_code = sd_nvic_ClearPendingIRQ(TIMER1_IRQn);
    APP_ERROR_CHECK(err_code);
    err_code = sd_nvic_EnableIRQ(TIMER1_IRQn);
    APP_ERROR_CHECK(err_code);

    NRF_TIMER1->TASKS_START = 1;

    while (1)
    {
        power_manage();
        if (data_rdy_flag != 0)
        {
            data_rdy_flag = 0;
        }
    }
}
void TIMER1_IRQHandler(void)
{
    if (NRF_TIMER1->EVENTS_COMPARE[0] != 0)
    {
        NRF_TIMER1->EVENTS_COMPARE[0] = 0; //clear interrupt

        data_rdy_flag = 1;
    }
}