RTOS/CC2640R2F: Sample test using only internal crystals

Part Number: CC2640R2F

Tool/software: TI-RTOS

Hi,

I would like to create a small project using only the internal crystals. I have a functional project using the internal 32Khz RCOSC but I also would like to use the internal 48Mhz. No BLE is needed or Advertising, only a LED blinking every second. I created a clock and through the main loop I blink the LED

The CC2640R2F is starting,blink the LED for 2-3 seconds, and then crash. I doesn't go into low power mode (current drawn stay at 2-3mA). I tried to change some options into the configuration file but the behavior is always the same. Maybe there is a register to set to prevent clock switching or something like this ?

Here's what I'm planning to do :

// Test clock only
static Clock_Struct Clock_TestClock;	
// LED management
static const PIN_Config aPinListHui[] =
{
 LED1   | PIN_GPIO_OUTPUT_EN    | PIN_PULLDOWN  | PIN_PUSHPULL  | PIN_DRVSTR_MIN,   // ON / OFF LED1
 PIN_TERMINATE
};
static PIN_State hStateHui; 	

// Main function
static void SimplePeripheral_taskFxn(UArg a0, UArg a1)
{
	// Register to Icall events
	ICall_registerApp(&selfEntity, &syncEvent);

    // Create an RTOS queue for message from profile to be sent to app.
    appMsgQueue = Util_constructQueue(&appMsg);
	
	// Create Clock
	const unsigned int CLOCK_LENGTH = 300;
    Util_constructClock(&Clock_TestClock, SimplePeripheral_clockHandler, CLOCK_LENGTH, CLOCK_LENGTH, true, EVENT_PERIODIC);
	
	// Application main loop
    for (;;)
    {
        uint32 events;

        // Waits for an event to be posted associated with the calling thread.
        // Note that an event associated with a thread is posted when a
        // message is queued to the message receive queue of the thread
        events = Event_pend(syncEvent, Event_Id_NONE, SBP_ALL_EVENTS, ICALL_TIMEOUT_FOREVER);

        if (events)
        {
            ICall_EntityID dest;
            ICall_ServiceEnum src;
            ICall_HciExtEvt *pMsg = NULL;

            // Fetch any available messages that might have been sent from the stack
            if (ICall_fetchServiceMsg(&src, &dest, (void **)&pMsg) == ICALL_ERRNO_SUCCESS)
            {
				//...
			}
			//...
		}
		
		// --------------------------------------------------------------------
        // Periodic event, test only
        // --------------------------------------------------------------------
        if (events & EVENT_PERIODIC)
        {
            events &= ~EVENT_PERIODIC;                      // Remove event

            if(PIN_open(&hStateHui, aPinListHui))
            {
                PIN_setPortOutputValue(&hStateHui, (1<<LED1));
                Task_sleep(25000);
                PIN_close(&hStateHui);
                Task_sleep(25000);
            }
        }
	}
}

Thanks in advance