So, ich bin fündig geworden:

Da gab's ein Prog von Jan-Peter Müller (LCD_DCFUhrsuche1_1.bas) für den RP5 mit Erweiterungsplatine (aber ohne CC2!):
Code:
'       Jan-Peter Müller
'       28.12.2003
'       DCFUhrsuche V 1.1
'
'
' --------------------------------------------------------------------------
'                       FUNKTION DES PROGRAMMS
' --------------------------------------------------------------------------
'                 Beispiel 1
'       Robby wird hingestellt, und sucht sich das DCF-Signal selbstständig.
'
'       Meine Messungen haben ergeben , dass das DCF-Modul von Conrad
'        Best.-Nr.:641138 einen Erfassungsbereich von 60 Grad hat.
'
'       Da Robby sich ja drehen kann , sucht er alleine das Signal !
'
'       Achtung kann bis zu 20 Minuten dauern !!!!!!!!!!!!!!!!!!!!!!!!!
'
'       Abruch nach 24 Minuten (evtl. kein Empfang)
'
'       Anzeige der Minuten über LED 1...8 , auf der Erweiterungsplatine
'       pro Minute ein LED
'
'---------------------------------------------------------------------------
'Hardware:
'               Robby
'               Erweiterungsplatine
'               Experimentierplatine
'               DCF-Modul Best.-Nr.:641138
'
'Achtung DCF-Modul im Abstand von ca. 5 cm montieren zur Experimentierplatine
'             , sonst kein Empfang !!!!!!!!!!!!!!!!!!
'
'-----------------------------------------------------------------------
'RESOURCEN:
'Sie finden in allen Beispielen sämtliche Systemroutinen die zum Betrieb des
'Roboters notwendig sind.
'----------------------------------------------------------------------------

'--------------------------
'------ I/O PORTS ---------
'--------------------------
'- INTERFACE LCD/EXTPORT --
define sdio         port[1]
define sclio        port[3]
define strobe       port[4]
define LSTROBE      port[7]
'-- INTERFACE COM/NAV -----
define DATALINE     port[1]
define CLOCKLINE    port[2]
'-- CC2 INTERFACE   -------
define CC2POWER     port[8]
'------ LCD INTERFACE ------
define lcd_port byteport[2]
define lcd_rs port[14]
define lcd_rw port[13]
define lcd_e port[15]
'--------------------------
'------ SENSORS ---------
'--------------------------
define LIGHT_L      ad[7]
define LIGHT_R      ad[6]
define SYS_VOLTS    ad[3]
define CHRG_CURRENT ad[2]
define SYS_CURRENT  ad[1]
define MIC          ad[4]
define TOUCH        ad[5]
'---------------------------
'------  DRIVE -------------
'---------------------------
define SPEED_L        da[1]
define SPEED_R        da[2]
define REV_L        port[6]
define REV_R        port[5]
'--------------------------
'---- SYSTEM MEMORY -------
'--------------------------
'--- INTERFACE BUFFER ----
define LBYTE         byte[1]
define HBYTE         byte[2]
define SUBCMD        byte[3]
'---- OPERATION DATA ------
define EXTPORT       byte[4]
define LED1_F        bit[29]
define LED2_F        bit[30]
define LED3_F        bit[31]
define LED4_F        bit[32]
define SYSTEM_STATUS byte[5]
define LEDPORT       byte[6]
define L1_F          bit[41]
define L2_F          bit[42]
define L3_F          bit[43]
define L4_F          bit[44]
define L5_F          bit[45]
define L6_F          bit[46]
define L7_F          bit[47]
define L8_F          bit[48]
'---- LCD DRIVER -------------
define lcd_buf   byte[7]
define lcd_param byte[8]
'--------------------------
'----  USER MEMORY  -------
'--------------------------
'--- BIN-DEZIMAL-CONVERTER ---
define hunderter byte [10]
define zehner    byte[11]
define einer     byte[12]
define value     byte[13]
define minutealt byte [14]
'--- SYSTEMROUTINEN -----------
define PLM_SLOW      &H01C2
define SYSTEM        &H01C7
define LED_DRIVE     &H01CA
define COMNAV        &H0144
'- ERWEITERTE SYSTEM ROUTINEN -
define REVR          &H0101   'ANTRIEB RECHTS RÜCKWÄRTS
define REVL          &H0106   'ANTRIEB LINKS RÜCKWÄRTS
define FWDR          &H010B   'ANTRIEG RECHTS VORWÄRTS
define FWDL          &H0110   'ANTRIEB LINKS VORWÄRTS
define ROTR          &H0115   'RECHTS DREHEN
define ROTL          &H0119   'LINKS DREHEN
define REV           &H011D   'RÜCKWÄRTS
define FWD           &H0121   'VORWÄRTS
define COMNAV_STATUS &H0125   'UPDATED ALLE FLAGS IM STATUS-REGISTER
define ACS_LO        &H01E0   'ACS POWER LO
define ACS_HI        &H01E8   '
define ACS_MAX       &H01F0   '
define SEND_TLM      &H013A   'SENDET TELEMETRIE (CH=HBYTE,DATEN=LBYTE)
define SEND_SYSSTAT  &H0134   'SENDET TLM KANAL 0,SYSTEM STATUS
                              '(FLAGS für ACS,FWD/REV, ACS_LO/HI/MAX)
'---------- INIT---------------
LSTROBE=off
gosub SUBSYS_PWR_ON:REV_L=on:REV_R=on:sys PLM_SLOW         'Muss immer im Programm stehen !
gosub lcd_init
beep 400,10,50
minutealt = minute
gosub LOFF
gosub LED4OFF
LBYTE=0
'----------------------------------------------------------
'- Programmanfang   DEMO  Uhrzeit   Synchronisieren      --
'----------------------------------------------------------
#start
        gosub CLR_DISTANCE

'#LCD_Laufschrift                                       '1.Zeile
        lcd_param = &H80
        lcd_buf = OFF
        gosub LCD_WRITE
        gosub Nachricht1                                'Zeichenausgabe

        for einer = 1 to 40                             '40 mal nach Links schieben

                lcd_port = 1
                tog lcd_e
                tog lcd_e
                lcd_port = 8
                tog lcd_e
                tog lcd_e
                pause 5
        next einer
 #loop
        SPEED_R=0:SPEED_L=0
        if hour <> 0 then goto ende                     'Sprung wenn DCF-Uhr gestellt hat
                                                        'geht nicht zwischen 00:00:00 und 00:59:59 sorry!
        if (minute - 4) = minutealt then gosub dreh1
        if (minute - 8) = minutealt then gosub dreh1
        if (minute - 12)= minutealt then gosub dreh1
        if (minute - 16)= minutealt then gosub dreh1
        if (minute - 20)= minutealt then gosub dreh1
        if (minute - 24)= minutealt then goto Fehler
        if minute = 1 then gosub L1ON                   'LED 1 an , nach einer Minute
        If minute = 2 then gosub L2ON                   'LED 2 an , nach zwei Minuten
        If minute = 3 then gosub L3ON                   'LED 3 an , nach drei Minuten
        If minute = 4 then gosub L4ON                   'LED 4 an , nach vier Minuten
        if minute = 5 then gosub L5ON                   'LED 5 an
        If minute = 6 then gosub L6ON                   'LED 6 an
        If minute = 7 then gosub L7ON                   'LED 7 an
        If minute = 8 then gosub L8ON                   'LED 8 an
        If minute = 9 then gosub L9ON                   'LED 8 an und LED 1
        If minute = 10 then gosub L10ON                 'LED 8 an und LED 2
        If minute = 11 then gosub L11ON                 'LED 8 an und LED 3
        If minute = 12 then gosub L12ON                 'LED 8 an und LED 4
        lcd_param = 2 : gosub lcd_gotoline
        lcd_param = &H20 : gosub lcd_writechar          '4 Leerzeichen
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        value=hour                                      ' Ausgabe Stunden
        gosub convert2
        lcd_param = &H3A : gosub lcd_writechar          ':
        value=minute                                    ' Ausgabe Minuten
        gosub convert2
        lcd_param = &H3A : gosub lcd_writechar          ':
        value=second                                    ' Ausgabe Sekunden
        gosub convert2

        goto loop

#dreh1
        gosub LOFF
        gosub CLR_DISTANCE
        minutealt=minute
        SPEED_R=100:SPEED_L=100:sys ROTR                'Rotieren nach rechts

#rot1
        SYS COMNAV_STATUS                               ';Abfrage des NAV
        gosub L_DISTANCE                                'Abfrage Linker Distanz-Sensor
        if LBYTE >= 1 then return                       'Wenn grosser 1 ,Sprung (60 Grad Drehung)
goto rot1                                               'Schleife, bis 1 erreicht ist

#ende
        gosub LOFF
        for einer = 50 to 250 step 5
        beep einer,0,0:next
        for einer = 50 to 250 step 5
        beep einer,0,0:next
        for einer = 50 to 250 step 5
        beep einer,0,0:next
        beep 200,1,1
        gosub LCD_CLS

#loop1
        lcd_param = 1 : gosub lcd_gotoline
        lcd_param = &H20 : gosub lcd_writechar          ' 3 Leerzeichen
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        value=hour                                      ' Ausgabe Stunden
        gosub convert2
        lcd_param = &H3A : gosub lcd_writechar          ':
        value=minute                                    ' Ausgabe Minuten
        gosub convert2
        lcd_param = &H3A : gosub lcd_writechar          ':
        value=second                                    ' Ausgabe Sekunden
        gosub convert2
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        on DOW gosub So,Mo,Di,Mi,Do,Fr,Sa
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = 2 : gosub lcd_gotoline
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        value=DAY                                       ' Ausgabe Tag
        gosub convert2
        lcd_param = &H2E : gosub lcd_writechar          '.
        value=MONTH                                     ' Ausgabe Monat
        gosub convert2
        lcd_param = &H2E : gosub lcd_writechar          '.
        value=YEAR                                      ' Ausgabe Jahr
        gosub convert2

        goto loop1

#Fehler
        gosub lcd_cls
        lcd_param = 1 : gosub lcd_gotoline
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H4B : gosub lcd_writechar          'K
        lcd_param = &H65 : gosub lcd_writechar          'e
        lcd_param = &H69 : gosub lcd_writechar          'i
        lcd_param = &H6E : gosub lcd_writechar          'n
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H45 : gosub lcd_writechar          'E
        lcd_param = &H6D : gosub lcd_writechar          'm
        lcd_param = &H70 : gosub lcd_writechar          'p
        lcd_param = &H66 : gosub lcd_writechar          'f
        lcd_param = &H61 : gosub lcd_writechar          'a
        lcd_param = &H6E : gosub lcd_writechar          'n
        lcd_param = &H67 : gosub lcd_writechar          'g
        lcd_param = &H20 : gosub lcd_writechar          '
        lcd_param = &H20 : gosub lcd_writechar          '
        beep 200,1,50
        beep 400,1,50
        beep 600,1,50
        end
'-------------------------------------------
'IIIIIII Nachricht 1 IIIIIIIIIII
 #Nachricht1
 gosub lcd_cls
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H20 : gosub lcd_writechar
 lcd_param = &H43 : gosub lcd_writechar    'C
 lcd_param = &H2D : gosub lcd_writechar    '-
 lcd_param = &H43 : gosub lcd_writechar    'C
 lcd_param = &H4F : gosub lcd_writechar    'O
 lcd_param = &H4E : gosub lcd_writechar    'N
 lcd_param = &H54 : gosub lcd_writechar    'T
 lcd_param = &H52 : gosub lcd_writechar    'R
 lcd_param = &H4F : gosub lcd_writechar    'O
 lcd_param = &H4C : gosub lcd_writechar    'L
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H52 : gosub lcd_writechar    'R
 lcd_param = &H4F : gosub lcd_writechar    'O
 lcd_param = &H42 : gosub lcd_writechar    'B
 lcd_param = &H4F : gosub lcd_writechar    'O
 lcd_param = &H54 : gosub lcd_writechar    'T
 lcd_param = &H20 : gosub lcd_writechar    '
 lcd_param = &H52 : gosub lcd_writechar    'R
 lcd_param = &H50 : gosub lcd_writechar    'P
 lcd_param = &H35 : gosub lcd_writechar    '5
 return

'IIIIIIIIIII LED DRIVER IIIIIIIIIIIIIIIII
#LED1ON
LED1_F=on:goto EXTPORT_WRITE
#LED1OFF
LED1_F=off :goto EXTPORT_WRITE
#LED2ON
LED2_F=on:goto EXTPORT_WRITE
#LED2OFF
LED2_F=off:goto EXTPORT_WRITE
#LED3ON
LED3_F=on:goto EXTPORT_WRITE
#LED3OFF
LED3_F=off:goto EXTPORT_WRITE
#LED4ON
LED4_F=on:goto EXTPORT_WRITE
#LED4OFF
LED4_F=off:goto EXTPORT_WRITE
#LEDSOFF
EXTPORT=EXTPORT and &H0F
#EXTPORT_WRITE
SYS SYSTEM:pulse STROBE:RETURN
'--- LEDS AUF DER BASIS ERWEITERUNG  ------
#L1ON
L1_F=on:goto LEDPORT_WRITE
#L1OFF
L1_F=off :goto LEDPORT_WRITE
#L2ON
L2_F=on:goto LEDPORT_WRITE
#L2OFF
L2_F=off :goto LEDPORT_WRITE
#L3ON
L3_F=on:goto LEDPORT_WRITE
#L3OFF
L3_F=off :goto LEDPORT_WRITE
#L4ON
L4_F=on:goto LEDPORT_WRITE
#L4OFF
L4_F=off :goto LEDPORT_WRITE
#L5ON
L5_F=on:goto LEDPORT_WRITE
#L5OFF
L5_F=off :goto LEDPORT_WRITE
#L6ON
L6_F=on:goto LEDPORT_WRITE
#L6OFF
L6_F=off :goto LEDPORT_WRITE
#L7ON
L7_F=on:goto LEDPORT_WRITE
#L7OFF
L7_F=off :goto LEDPORT_WRITE
#L8ON
L8_F=on:goto LEDPORT_WRITE
#L8OFF
L8_F=off :goto LEDPORT_WRITE
#LOFF
LEDPORT=0
#LEDPORT_WRITE
SYS LED_DRIVE:pulse LSTROBE:RETURN
'---------------------------------------------
#L9ON
        gosub L8ON:gosub L1ON
        return
#L10ON
        gosub L8ON:gosub L2ON
        return
#L11ON
        gosub L8ON:gosub L3ON
        return
#L12ON
        gosub L8ON:gosub L4ON
        return
'--------------------------------------------
'++++++++++++ CONVERT BINARY TO DECIMAL +++++++++++++++
#convert2
 'zehner abfragen
 zehner=(value-(hunderter*100))/10
 lcd_param=zehner+&H30
 gosub lcd_writechar
 'einer abfragen
 einer=value-(hunderter*100)-(zehner*10)
 lcd_param=einer+&H30
 gosub lcd_writechar
 return
 '---------------------------------------------------
 #convert3
 hunderter=value/100
 if hunderter>0 then lcd_param=hunderter+&H30 else lcd_param=&H20
 gosub lcd_writechar
 'zehner abfragen
 zehner=(value-(hunderter*100))/10
 lcd_param=zehner+&H30
 gosub lcd_writechar
 'einer abfragen
 einer=value-(hunderter*100)-(zehner*10)
 lcd_param=einer+&H30
 gosub lcd_writechar
 return
'----------------------------------------
'------------- LCD ROUTINE  -------------
'----------------------------------------
#LCD_INIT
' alle ports 0
  lcd_port = OFF

' 8-Bit-Modus aktivieren
  lcd_param=&H38 : gosub LCD_WRITECMD

' mit 8-Bit-Command in 4-Bit-Modus umschalten
  lcd_port=&B00000010
  tog lcd_e
  tog lcd_e

' ab jetzt 4-Bit-Modus
  lcd_param = &H28 : gosub LCD_WRITECMD
  lcd_param = &H0C : gosub LCD_WRITECMD

' Display loeschen
#LCD_CLS
  lcd_param = &H02 : gosub LCD_WRITECMD
  lcd_param = &H01 : gosub LCD_WRITECMD
return
' Zeilenwechsel
#LCD_GOTOLINE
  if lcd_param = 1 then lcd_param = &H80
  if lcd_param = 2 then lcd_param = &HC0
  goto LCD_WRITECMD

' LCD-Kommando
#LCD_WRITECMD
  lcd_buf = OFF
  goto LCD_WRITE

' Zeichenausgabe
#LCD_WRITECHAR
  lcd_buf = &B00100000

' Kommando oder Zeichen an Display senden
#LCD_WRITE
  lcd_port = lcd_buf or (lcd_param shr 4) ' Hi-Nibble
  tog lcd_e
  tog lcd_e
  lcd_port = lcd_buf or (lcd_param and &H0F)  ' Lo-Nibble
  tog lcd_e
  tog lcd_e
return

'--------------------------------------------
'-------------------- Wochentage für LCD-Ausgabe --------------------------

#So
        lcd_param = &H53 : gosub lcd_writechar    'S
        lcd_param = &H6F : gosub lcd_writechar    'o
        return
#Mo
        lcd_param = &H4D : gosub lcd_writechar    'M
        lcd_param = &H6F : gosub lcd_writechar    'o
        return
#Di
        lcd_param = &H44 : gosub lcd_writechar    'D
        lcd_param = &H69 : gosub lcd_writechar    'i
        return
#Mi
        lcd_param = &H4D : gosub lcd_writechar    'M
        lcd_param = &H69 : gosub lcd_writechar    'i
        return
#Do
        lcd_param = &H44 : gosub lcd_writechar    'D
        lcd_param = &H6F : gosub lcd_writechar    'o
        return
#Fr
        lcd_param = &H46 : gosub lcd_writechar    'F
        lcd_param = &H72 : gosub lcd_writechar    'r
        return
#Sa
        lcd_param = &H53 : gosub lcd_writechar    'S
        lcd_param = &H61 : gosub lcd_writechar    'a
        return
'--------------------------------------------------------------
'IIIIII SYSTEMROUTINEN COMM/NAV SYSTEM  IIIII
#GET_IRDATA
SUBCMD=1:sys COMNAV:return
#SEND_IRDATA
SUBCMD=0:sys COMNAV:return
#RC5
SUBCMD=4:sys COMNAV:LBYTE= HBYTE and &HFC
HBYTE=00:SUBCMD=2:sys COMNAV:return
#RC5_INT
SUBCMD=4:sys COMNAV:LBYTE= (HBYTE and &HFE)or 2
HBYTE=00:SUBCMD=2:sys COMNAV:return
#REC80
SUBCMD=4:sys COMNAV:LBYTE= (HBYTE or &H01)and&HFD
HBYTE=00:SUBCMD=2:sys COMNAV:return
#REC80_INT
SUBCMD=4:sys COMNAV:LBYTE= (HBYTE or &H03)
HBYTE=00:SUBCMD=2:sys COMNAV:return
'IIIIII   SYSTEMROUTINEN SYSTEM  IIIIIIIIIIII
#NO_ACS_INT
SUBCMD=4:sys COMNAV:LBYTE= HBYTE and &HFB
HBYTE=00:SUBCMD=2:sys COMNAV:return
#ACS_INT_200
SUBCMD=4:sys COMNAV:LBYTE= HBYTE or &H04
HBYTE=50:SUBCMD=2:sys COMNAV:return
#SUBSYS_PWR_ON
sdio=on:sclio=on:strobe=off:EXTPORT=(EXTPORT and &HFE)or 8
sys SYSTEM:return
#SUBSYS_PWR_OFF
EXTPORT=(EXTPORT and &HF7)or 1:sys SYSTEM
deact sdio:deact sclio:return


#CLR_DISTANCE
SUBCMD=3:sys COMNAV:return
#L_DISTANCE
SUBCMD=6:sys COMNAV:return
#R_DISTANCE
SUBCMD=7:sys COMNAV:return
'---------COM/NAV GERÄTETREIBER -------------
'syscode "p5driv12.s19"
Vielleicht hilft es beim Abgucken der Programmidee.
Bei mir half das Prog nicht so wirklich, weil mein Aufbau schon nach wenigen Minuten DCF-Empfang hatte (auch wenn das Modul nicht genau nach Frankfurt ausgerichtet war).

Gruß Dirk