AS3992阅读器主程序里为什么要用莫尔斯编码？完全不懂啊，哪位大神指教一下啊。

/*
*****************************************************************************
* Copyright @ 2009 by austriamicrosystems AG                                *
* All rights are reserved.                                                  *
*                                                                           *
* IMPORTANT - PLEASE READ CAREFULLY BEFORE COPYING, INSTALLING OR USING     *
* THE SOFTWARE.                                                             *
*                                                                           *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT         *
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS         *
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  *
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,     *
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT          *
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,     *
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY     *
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT       *
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE     *
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.      *
*****************************************************************************
*/
/** @file
  *
  *
  * @author Ulrich Herrmann
  */



#include "c8051F340.h"
#include "uart.h"
#include "as399x_public.h"
#include "as399x.h"
#include "gen2.h"
#include "global.h"
#include "iso6b.h"
#include "timer.h"
#include "usb_commands.h"
#include "as399x_config.h"
#include "F340_FlashPrimitives.h"
#include "F3xx_USB0_Register.h"
#include "F3xx_Blink_Control.h"
#include "F3xx_USB0_InterruptServiceRoutine.h"
#include "F3xx_USB0_Descriptor.h"

extern  Freq Frequencies;
extern XDATA Tag tags_[MAXTAG];
#define ENTRY_POINT_ADDR 0

static bool continueAlways( ) {return 1; }
static void calcBestSlotSize( void )
{
    u8 round;
    u8 powSlot;
    u8 numTags;

    for ( powSlot = 0; powSlot < 15 ; powSlot ++)  //try every q
    {
        u8 maxTags=0;
        u16 tagsFound=0;
        for ( round = 0; round < 255 ; round ++)
        {
            numTags = gen2SearchForTags(tags_,16,0,0,powSlot,0, continueAlways);
            tagsFound+= numTags;
            if ( numTags > maxTags) maxTags = numTags;
        }
        CON_print("found with powSlot=%hhx %x tags, max %hhx\n",
                                      powSlot,        tagsFound,maxTags);
    }
}

static const u8 codes[0x10] =
{
    /* upper 3 bits length, lower 5 bits shorts/longs */
    0xbf, /* 0 ----- */
    0xaf, /* 1 .---  */
    0xa7, /* 2 ..--- */
    0xa3, /* 3 ...-- */
    0xa1, /* 4 ....- */
    0xa0, /* 5 ..... */
    0xb0, /* 6 -.... */
    0xb8, /* 7 --... */
    0xbc, /* 8 ---.. */
    0xbe, /* 9 ----. */
    0x41, /* a .-    */
    0x88, /* b -...  */
    0x8a, /* c -.-.  */
    0x64, /* d -..   */
    0x20, /* e .     */
    0x82, /* f ..-.  */
};

static void morse_nibble( u8 nibble )
{
    u8 i, cod, code_len;

    if (nibble > 0xf) nibble = 0x89; /* -..- = "x" */

    cod = codes[nibble];
    code_len = cod >> 5;

    for ( i = code_len; i>0; i-- )
    {
        LED1(0);
        if ( cod & (1<<(i-1)) )
        {
            CON_print("-");
            mdelay(450);
        }
        else
        {
            CON_print(".");
            mdelay(150);
        }
        LED1(1);
        mdelay(150);
    }
    CON_print(" %hhx\n", nibble);
    mdelay(450);
}

/** main function
  + It dosn't take any parameter and it doesn't return a value
  */
void main(void)
{

    u8 count = 0;
    u16 failure;
    unsigned  short  counter = 200;
    u8 a;
    PCA0MD &= ~0x40;                         /* WDTE = 0 (clear watchdog timer */

    /* System_Init already sets clocks, do this before initing uart */
    System_Init ();
       

    EA = 1; /* enable all interrupts */

    initUART();

    initCommands(); /* USB report commands */

    CON_print("Hello World\n");

    /* Fill frequencies interval used in usb_commands.c with values */
    /* European channels since we are developping in Europe, values can be changed using GUI */
    Frequencies.freq[0]= 866900;Frequencies.rssiThreshold[0]=-40;
    Frequencies.freq[1]= 865700;Frequencies.rssiThreshold[1]=-40;
    Frequencies.freq[2]= 866300;Frequencies.rssiThreshold[2]=-40;
    Frequencies.freq[3]= 867500;Frequencies.rssiThreshold[3]=-40;
    Frequencies.activefreq=4;

    failure = as399xInitialize(912000); /* Initializes also the parallel interface. */
    if (failure)
    {
        mdelay(1000);
        morse_nibble(failure);
        mdelay(1000);
    }

    CON_print("as399xInitialize() returned %x\n",failure);

    //iso6bInitialize();


    //calcBestSlotSize();

#ifdef ENTRY_POINT_ADDR
    /* systems seems to be up and running. set the magic byte to tell the bootloader引导模式
       to boot the image also next time */
    if (ENTRY_POINT_ADDR > 0)
    {
        FLASH_ByteWrite(ENTRY_POINT_ADDR-1, 0xaa);
    }
#endif
#if ！ UARTSUPPORT  //in as399x_config.h #define   UARTSUPPORT 1
    Usb_Init ();         
#endif
         
    while (1)
    {
        if (counter)
        {
            counter--;
        }
        else
        {
            counter = (24000<<(failure?4:0));
            if (a) {
                a=0;
                LED1(0);
            }
            else {
                a=1;
                LED1(1);
            }
        }  

#if UARTSUPPORT
        uartCommands();         /* main trigger for operation commands received by UART. */
#else
        commands(); /* main trigger for operation commands received by USB. */   
#endif
    }
}

好长的程序，看得懂的走起来~~

这只是主函数。不知道为什么要用莫尔斯编码啊