Hallo,

ich habe einen Sensor, der seine Daten per RS485 an eine Anzeigeeinheit sendet. Wenn ich beide mega´s neu starte, klappt alles einwandfrei. Sobald ich die Anzeigeeinheit jedoch was in Richtung Sensor schicken lasse, kommt die Anzeige durcheinander und zeigt mir nicht mehr die richtigen werte an.

So sollte es aussehen:

118 cm ( funktioniert bis ich von der Anzeige was an den sensor schicke )

So sieht es aus, nachdem ich was gesendet habe.

811 cm ( also die Zahlen verschoben )

hier ist der Code von der Anzeigeeinheit:




Code:
'----------------- CPU Config ---------------------------
$regfile = "m16def.dat"
$crystal = 1000000
$baud = 1200
'--------------- Portdefinition ------------------------
Config Porta = Output
Config Portb = Output
Config Portd.7 = Input
Config Portd.6 = Input
Config Portc = Output
Config Portd.2 = Output
Config Debounce = 100
'---------------------------------------- LCD ----------------------------------
Config Lcd = 16 * 2
Config Lcdpin = Pin , Db4 = Portc.0 , Db5 = Portc.1 , Db6 = Portc.2 , Db7 = Portc.3 , E = Portc.4 , Rs = Portc.5
'----------------------------------- Timer --------------------
Enable Interrupts
'----------------- Sub ------------------------------
Declare Sub Balken
Declare Sub Anzeige
'-------------- Alias -----------------------------------
Led1 Alias Porta.7
Led2 Alias Porta.6
Led3 Alias Porta.5
Led4 Alias Porta.4
Backlight Alias Portb.4
Rs485 Alias Portd.2
Taster2 Alias Pind.6
Taster1 Alias Pind.7
'--------------------------------- Timer ------------------
Config Timer0 = Timer , Prescale = 8
Enable Timer0
On Timer0 Hintergrundzeit
'-------------------------- RS485 -----------------------
Rs485 = 0
On Urxc Onrxd
'-------------------- Dims ---------------------------
Dim Ubertrag As String * 3
Dim Wert As Integer
Dim Xtast As Bit
Dim X1 As Byte
Dim Backtime As Integer
Deflcdchar 1 , 17 , 14 , 17 , 17 , 17 , 17 , 14 , 32
'----------------------------- Variable -------------
X1 = 1
'------------------- Main -------------------------------
Xtast = 0
Cls
Cursor Off Noblink
Backlight = 1
Wait 1
Locate 1 , 1
Lcd " " ; Chr(1) ; "ltank  Sensor "
Locate 2 , 1
Lcd "  by Kay Pohl "
Wait 2
Cls
Locate 1 , 1
Lcd "-- Tankinhalt --"
Wait 1
Enable Urxc
Led2 = 1
Led3 = 1
Led4 = 1
'-------------------- Hauptprogramm ---------------
_start:
Debounce Taster2 , 0 , Sprungmain
Debounce Taster1 , 0 , Licht
Goto _start
'---------- Einlesen ----------
Onrxd:
Inputbin Ubertrag
Toggle Led4
Call Anzeige
Return
'---------------------------------------- Zeichenanzeige --------------------------------------
Sub Anzeige
Locate 2 , 1
Lcd Ubertrag ; " cm" ; "             "
End Sub
'------------------------------------------- Hintergrundzeit --------------------------------
Hintergrundzeit:
Incr Backtime
If Backtime = 30000 Then
   Backlight = 0
End If
Return
'------------------------------------------------ Licht -------------------------------------------
Licht:
Backlight = 1
Backtime = 0
Goto _start
'-------------------------------------- Sprungmain ------------------
Sprungmain:
Disable Urxc
Rs485 = 1
         Print "1"
                  Do
         Loop Until Ucsra.txc = 1
        Set Ucsra.txc

Rs485 = 0
Led2 = 0
Waitms 200
Led2 = 1
Waitms 10
Enable Urxc


Goto _start
und hier der Code vom Sensor :

Code:
'------------------------ CPU Config -------------------------
$regfile = "m8def.dat"
$crystal = 1000000
$baud = 1200
$framesize = 42
$swstack = 42
$hwstack = 42
'------------------------ Port Config --------------------------
Config Portb = Output
Config Portd.2 = Output
Config Scl = Portc.5
Config Sda = Portc.4
Const Srf02_slaveid = &HE0
'------------------------ Alias ----------------------------------
Led1 Alias Portb.0
Led2 Alias Portb.1
Led3 Alias Portb.2
Led4 Alias Portb.3
Rs485 Alias Portd.2
'-------------------------- Subs -------------------------------
Led1 = 1
Led2 = 1
Led3 = 1
Led4 = 1
'--------------------------- RS485 -------------------------------
Rs485 = 0
Enable Interrupts
On Urxc Onrxd
Enable Urxc
'----------------------------- Dims ------------------------------
Dim Entfernung As Integer
Dim V As Byte
Dim Wert As String * 3
Dim Ubertrag As String * 3
Dim Sendung As String * 1
Dim Zeit As Byte
Dim Temp1 As String * 3
Zeit = 1
'----------------------- Funcitons -------------------------
Declare Function Srf02_firmware(byval Slaveid As Byte) As Byte
Declare Function Srf02_entfernung(byval Slaveid As Byte) As Integer
Declare Sub Senden()
'------------------------- Boot ---------------------------------
Wait 1
I2cinit
V = 1
Waitms 100
'---------------------------------- Mainprogramm ------------------
Main:
Entfernung = Srf02_entfernung(srf02_slaveid)
Waitms 100
Wert = Str(entfernung)
Ubertrag = Format(wert , "000")
Waitms 100

Rs485 = 1

         Print Ubertrag ;
                  Do
         Loop Until Ucsra.txc = 1
         Set Ucsra.txc

Rs485 = 0
Waitms 500
Goto Main

'------------- Hilfsfunktionen für SRF02 ----------


Function Srf02_firmware(byval Slaveid As Byte) As Byte
Local Firmware As Byte
Local Slaveid_read As Byte

   Slaveid_read = Slaveid + 1

   I2cstart
   I2cwbyte Slaveid
   I2cwbyte 0                                               'Leseregister festlegen
   I2cstop

   I2cstart
   I2cwbyte Slaveid_read
   I2crbyte Firmware , Nack
   I2cstop

   Srf02_firmware = Firmware
End Function



Function Srf02_entfernung(byval Slaveid As Byte) As Integer
Local Lob As Byte
Local Hib As Byte
Local Firmware As Byte
Local Temp As Byte
Local Slaveid_read As Byte

   Slaveid_read = Slaveid + 1

   'Messvorgang in starten
   I2cstart
   I2cwbyte Slaveid
   I2cwbyte 0
   I2cwbyte 81                                              'in Zentimetern messen
   I2cstop


Warteaufmessung:
   Waitms 1
   Firmware = Srf02_firmware(slaveid)
   If Firmware = 255 Then Goto Warteaufmessung

   I2cstart
   I2cwbyte Slaveid
   I2cwbyte 2                                               'Leseregister festlegen
   I2cstop


   I2cstart
   I2cwbyte Slaveid_read
   I2crbyte Hib , Ack
   I2crbyte Lob , Nack
   I2cstop


   Srf02_entfernung = Makeint(lob , Hib)
End Function

'-------------------------------------------- Empfang -------------------------
Onrxd:
Inputbin Sendung

If Sendung = "1" Then
 Toggle Led1
End If

Return
'------------------------ Senden ---------------------------------------
Sub Senden()

End Sub
ich sitze jetzt schon seit 2 Tagen an dem Problem und befürchte, das ich irgendeinen Denkfehler mache. Könnt Ihr mir helfen ?

mfg Kay