blinky_freertos example adds Serial UART but nrf_serial_init() fail

Question

SDK version: nRF5_SDK_15.3.0 
 Platform: nRF52840 DK 
 SoftDevice: s140 
 -- 
 Hi All, 
 I use blinky_freertos example to add nrf_serial lib to send/receive AT command by UART port. 
 It's work when I press "build and run" on SES IDE, 
 bit if I switch the power key on nRF52840DK, it's didn't work. 
 I try to trace to find that nrf_serial_init() call nrf_queue_reset() and the nrf_queue_reset() can not return. 
 I don't know why. 
 
 NRF_SERIAL_UART_DEF(serial1_uarte, 1);

NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uarte1_drv_config,
 ARDUINO_0_PIN, ARDUINO_1_PIN,
 RTS_PIN_NUMBER, CTS_PIN_NUMBER,
 NRF_UART_HWFC_DISABLED, NRF_UART_PARITY_EXCLUDED,
 NRF_UART_BAUDRATE_115200,
 UART_DEFAULT_CONFIG_IRQ_PRIORITY);

NRF_SERIAL_CONFIG_DEF(serial1_config, NRF_SERIAL_MODE_DMA,
 &serial1_queues, &serial1_buffs, NULL, sleep_handler);

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,
 UART_HWFC,
 false,
#if defined (UART_PRESENT)
 NRF_UART_BAUDRATE_115200
#else
 NRF_UARTE_BAUDRATE_115200
#endif
 };

 APP_UART_FIFO_INIT(&comm_params,
 UART_RX_BUF_SIZE,
 UART_TX_BUF_SIZE,
 uart_error_handle,
 APP_IRQ_PRIORITY_LOWEST,
 err_code);

 APP_ERROR_CHECK(err_code);
}


int main(void)
{
 ret_code_t err_code;
 ret_code_t ret;
 uart_init();

 ret = nrf_drv_clock_init();
 APP_ERROR_CHECK(ret);
 ret = nrf_drv_power_init(NULL);
 APP_ERROR_CHECK(ret);
 

 nrf_drv_clock_lfclk_request(NULL);
 ret = app_timer_init();
 APP_ERROR_CHECK(ret);

 bsp_board_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS);
 
 ret = nrf_serial_init(&serial1_uarte, &m_uarte1_drv_config, &serial1_config);
 APP_ERROR_CHECK(ret);

 xMutex = xSemaphoreCreateMutex();
 
 at_setting(_AT, 3000);
 at_setting(_QICSGP, 200);
 at_setting(_QIACT_1, 2000);
 at_setting(_QIACT_IP, 2000);
 
 // MQTT AT Command
 at_setting(_QMTCFG_VER_0, 300);
 at_setting(_QMTOPEN_0, 5000);
 at_setting(_QMTCONN_0, 3000);
 
 if( xMutex != NULL )
 {
 UNUSED_VARIABLE(xTaskCreate(mqtt_sub_task_function, "SUB", configMINIMAL_STACK_SIZE + 200, NULL, 3, &mqtt_sub_task_handle));
 UNUSED_VARIABLE(xTaskCreate(mqtt_pub_task_function, "PUB", configMINIMAL_STACK_SIZE + 200, NULL, 3, &mqtt_pub_task_handle));

 // Activate deep sleep mode 
 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
 vTaskStartScheduler();
 }
 while (true)
 {
 // FreeRTOS should not be here... FreeRTOS goes back to the start of stack
 // in vTaskStartScheduler function. 
 }
 
} 
 BTW, this example I use app_timer(RTC1) and FreeRTOS timer(RTC2) 
 
 Thanks. 
 Tim