DA14681 pro board works well with debugger, but halted when run alone

Hi IM_Dialog,
Thank you vour kindly replay. Here's the init code:
bool i2c_devices_async_init(void)
{
bool ret1, ret2;
静态const i2c_config cfg = {
.speed = HW_I2C_SPEED_STANDARD,
.mode = HW_I2C_MODE_MASTER,
.addr_mode = HW_I2C_ADDRESSING_7B,
};

hw_i2c_init(HW_I2C1, &cfg);
srand(OS_GET_TICK_COUNT());

/ *
* Get handle to temperature sensor device.
* This call does not configure I2C controller yet.
*/
// tpdev = ad_i2c_open(TP_MMS427);
imudev = ad_i2c_open(IMU_LSM6DS3);
// magdev = ad_i2c_open（mag_ak09915）;
/ *
* Create event that will be used by GUI to wait for I2C transactions to finish.
* This event will be used for access temperature sensor or EEPROM from GUI task.
*/
init_event(&i2c_signal);

// ret1 = tp_device_init();

ret2 = imu_6axes_init();
/ *ret1 = ret1 && ret2;

ret2 = mag_device_init();
ret1 = ret1 && ret2;

//for test only
mag_set_power_mode(4); //100hz refresh
*/ return (ret2);
}
And the refresh sensor code, which excute in timer notify :
静电void refresh_sensor（void）
{
int32_t imudata[6];
int16_t magdata[3];
uint8_t k1status, tpirqstatus;
uint8_t xy[2];

// pm_stay_alive();
k1status =（uint8_t）hw_gpio_get_pin_status（app_button_gpio_port，app_button_gpio_pin）;
tpirqstatus = (uint8_t)hw_gpio_get_pin_status(TP_IRQ_GPIO_PORT, TP_IRQ_GPIO_PIN);

if (imu_6axes_read_data(imudata)) {
printf("IO:%d|%d Acc:%d,%d,%d, ", k1status, tpirqstatus, (int)imudata[0], (int)imudata[1], (int)imudata[2]);

printf("Gyro:%d,%d,%d\r\n", (int)imudata[3], (int)imudata[4], (int)imudata[5]);
}
/ * if（tp_drv_read_coorder（xy））{
printf("TP:%u,%u ", xy[0], xy[1]);

}
if (mag_device_read(magdata)) {
printf("mag:%d,%d,%d\r\n", magdata[0], magdata[1], magdata[2]);

}*/
// pm_resume_sleep();

}

the function imu_6axes_read_data use imu_i2c_read function read several registers from IMU and calculate values:

bool imu_i2c_read(uint8_t* pBuffer, uint8_t DeviceAddr, uint8_t RegisterAddr,
uint16_t NumByteToRead)
{
bool ret = false;

ad_i2c_device_acquire(imudev);

if(HW_I2C_ABORT_NONE != i2c_device_read_async(imudev, &RegisterAddr, pBuffer, 1, NumByteToRead, &i2c_signal))
goto exit;

ret = true;

exit:
ad_i2c_device_release(imudev);
return ret;
}
the I2C read registers function: the signal related funtions are the same as in i2c_demo.c.

static HW_I2C_ABORT_SOURCE i2c_device_read_async(i2c_device dev, uint8_t* reg, const uint8_t *buf, uint8_t reglen,
uint8_t buflen, i2c_event *event)
{
/ *
* Make sure event is not in signal state yet;
*/
reset_event(event);

/ *
* Writing sensor register, use callback that will signal event for synchronization.
*/
ad_i2c_async_transact(dev, I2C_SND(reg, reglen), I2C_RCV(buf, buflen),
I2C_CB1(signal_event, event), I2C_END);
/ *
* Wait for transaction to complete.
*/
wait_for_event(event);

/ *
* Error code if any is stored in event, return it.
*/
return event->error;

}

I need to emphasize that I can successfully init and read the IMU data for dozens of times before the system halt. the printf output like this:

2017/1/11 10:08:05.658 [RX] -
IMU XG_ID：0x69
Advertise started!
IO:1|1 Acc:-38,16,1043, Gyro:1680,-10710,-7630
IO:1|1 Acc:-38,16,1041, Gyro:1610,-10570,-7630
IO:1|1 Acc:-38,16,1041, Gyro:1680,-10640,-7630
IO：1 | 1 ACC：-38,17,1040，陀螺仪：1750，-10640，-7560
IO:1|1 Acc:-38,16,1041, Gyro:1680,-10640,-7630
IO:1|1 Acc:-38,16,1041, Gyro:1680,-10640,-7630
...

问候，
Duan

Thank you for your replay.
I followed the demo demo_i2c_async.c exactly. the declare of devices were made in a copy of platform_devices.h in config foler like the demo:
I2C_BUS(I2C1)

#ifdef CONFIG_IMU_LSM6DS3
/ *Example temperature sensor FM75 */
I2C_SLAVE_DEVICE(I2C1, IMU_LSM6DS3, 0x6A, HW_I2C_ADDRESSING_7B, HW_I2C_SPEED_STANDARD);
#endif
#ifdef CONFIG_MAG_AK09915
/ *Example temperature sensor FM75 */
I2C_SLAVE_DEVICE(I2C1, MAG_AK09915, 0x0c, HW_I2C_ADDRESSING_7B, HW_I2C_SPEED_STANDARD);
#endif

but I can't find any initialize like I2C_BUS_INIT(I2C1); in the demo. So I didn't add them in previous code.

And I add the macro in init between hardware init and devices open:
hw_i2c_init(HW_I2C1, &cfg);
srand(OS_GET_TICK_COUNT());
I2C_BUS_INIT(I2C1);

I2C_DEVICE_INIT(IMU_LSM6DS3);
I2C_DEVICE_INIT(MAG_AK09915);
/ *
* Get handle to temperature sensor device.
* This call does not configure I2C controller yet.
*/
// tpdev = ad_i2c_open(TP_MMS427);
imudev = ad_i2c_open(IMU_LSM6DS3);
magdev = ad_i2c_open(MAG_AK09915);

But get the same result. What should I try next? Thank you!