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CC1310 rfPacketRx例程问题

在测试例程中,打印函数没问题的,但是放到这里就不打印了,请问这是怎么回事?

/* Enter RX mode and stay forever in RX */
    RF_EventMask terminationReason = RF_runCmd(rfHandle, (RF_Op*)&RF_cmdPropRx,
                                               RF_PriorityNormal, &callback,
                                               RF_EventRxEntryDone);
    Display_printf(uartDisplayHandle, 0, 0, "ok");
    switch(terminationReason)
    {
        case RF_EventCmdDone:
            // A radio operation command in a chain finished
            break;
        case RF_EventLastCmdDone:
            // A stand-alone radio operation command or the last radio
            // operation command in a chain finished.          
            break;
        case RF_EventCmdCancelled:
            // Command cancelled before it was started; it can be caused
            // by RF_cancelCmd() or RF_flushCmd().
            break;
        case RF_EventCmdAborted:
            // Abrupt command termination caused by RF_cancelCmd() or
            // RF_flushCmd().
            break;
        case RF_EventCmdStopped:
            // Graceful command termination caused by RF_cancelCmd() or
            // RF_flushCmd().
            break;
        default:
            // Uncaught error event
            while(1);
    }