Der Code für den Drucksensor (noch nicht getestet), von http://www.kh-gps.de/

Code:
'BMP085_8_lcd2a_t       86% belegt    OK am 25.3.2010

'###############################################################################

$regfile = "m8def.dat"
$crystal = 8000000
$baud = 9600
$hwstack = 64
$swstack = 64
$framesize = 64
$sim

'###############################################################################
'Byte = 0 to 255
'Word = 0 to 65535
'Integer = -32768 to 32767
'Long = -214783648 to 2147483647
'Single = 1.5 x 10^-45 to 3.4 x 10^38
'Double = 5.0 x 10^-324 to 1.7 x 10^38

Dim Ac1 As Single
Dim Ac2 As Single
Dim Ac3 As Single
Dim Ac4 As Long
Dim Ac5 As Long
Dim Ac6 As Long

Dim B1 As Single
Dim B2 As Single
Dim B3 As Long
Dim B4 As Long
Dim B4a As Single
Dim B5 As Single
Dim B6 As Single
Dim B7 As Long

Dim Mb As Single
Dim Mc As Single
Dim Md As Single

Dim Ut As Long
Dim Up As Long

Dim X1 As Single
Dim X2 As Single
Dim X3 As Single

Dim Zwr1 As Single
Dim Zwr2 As Single
Dim Zwr3 As Single
Dim Zwr4 As Single

Dim T As Single
Dim T_str As String * 4
Dim P As Single
Dim P2 As Single

Dim Po As Single
Dim A As Single
Dim A2 As Word

Dim Adres As Byte
Dim Value As Byte
Dim Result As Integer

Dim Hi As Long
Dim Lo As Long
Dim Xlo As Long

Config Scl = Portb.1
Config Sda = Portb.0
I2cinit

Config Portb.6 = Output
Config Portb.7 = Output
Portb = &B11000000

Dim N As Byte
N = 1
Do
Portb.6 = 1
Portb.7 = 0
Waitms 50
Portb.6 = 0
Portb.7 = 1
Waitms 50
N = N + 1
Loop Until N = 20

Declare Sub Write_bmp(byval Adres As Byte , Byval Value As Byte)
Declare Sub Read_bmp(byval Adres As Byte , Value As Byte)
Declare Sub Read_reg

Const Addressw = &B11101110                                 'slave write address
Const Addressr = &B11101111                                 'slave read address

Config Lcd = 16 * 2
Config Lcdpin = Pin , Db4 = Portc.2 , Db5 = Portc.3 , Db6 = Portc.4 , Db7 = Portc.5 , E = Portc.1 , Rs = Portc.0
Cls
Cursor Off

Locate 1 , 1
Lcd " BMP085-DECODER "
Locate 2 , 1
Lcd "(C)2010 KHH V1.2"
Wait 3

'hole Kalibrierungsdaten
'-------------------------------------------------------------------------------
Adres = &HAA                                                'Startadresse calibration data

'Do
Waitms 50
Call Read_reg
Ac1 = Result
'Print "AC1= " ; Ac1
Call Read_reg
Ac2 = Result
'Print "AC2= " ; Ac2
Call Read_reg
Ac3 = Result
'Print "AC3= " ; Ac3
Call Read_reg
Ac4 = Result
'Print "AC4= " ; Ac4
Call Read_reg
Ac5 = Result
'Print "AC5= " ; Ac5
Call Read_reg
Ac6 = Result
'Print "AC6= " ; Ac6
Call Read_reg
B1 = Result
'Print "B1=  " ; B1
Call Read_reg
B2 = Result
'Print "B2=  " ; B2
Call Read_reg
Mb = Result
'Print "MB=  " ; Mb
Call Read_reg
Mc = Result
'Print "MC=  " ; Mc
Call Read_reg
Md = Result
'Print "MD=  " ; Md
'Print

Dim Xx As Byte
Xx = 1

Do
Waitms 100
'hole Rohdaten Temperatur
'-------------------------------------------------------------------------------
Call Write_bmp(&Hf4 , &H2E)
Waitms 5
Call Read_bmp(&Hf6 , Value)                                 'read it back
Hi = Value * 256
Call Read_bmp(&Hf7 , Value)                                 'read it back
Ut = Hi + Value
'Print "UT=  " ; Ut
'Print

Waitms 100
'hole Rohdaten Luftdruck
'-------------------------------------------------------------------------------
Call Write_bmp(&Hf4 , &H34)
Waitms 40
Call Read_bmp(&Hf6 , Value)                                 'read it back
Hi = Value * 256
Call Read_bmp(&Hf7 , Value)                                 'read it back
Up = Hi + Value
'Print "UP=  " ; Up
'Print

'Testwerte
'------------------------------------------------------
Ac1 = 408
Ac2 = -72
Ac3 = -14383
Ac4 = 32741
Ac5 = 32757
Ac6 = 23153
B1 = 6190
B2 = 4
Mb = -32768
Mc = -8711
Md = 2868

Ut = 27898                                                  'Temperatur
Up = 23843                                                  'Pressure

'kalkuliere tatsaechliche Temperatur
'-------------------------------------------------------------------------------
Zwr1 = Ut - Ac6
Zwr2 = 2 ^ 15
Zwr2 = Ac5 / Zwr2
X1 = Zwr1 * Zwr2
Print "X1=  " ; X1

Zwr1 = 2 ^ 11
Zwr2 = Mc * Zwr1
Zwr3 = X1 + Md
X2 = Zwr2 / Zwr3
Print "X2=  " ; X2

B5 = X1 + X2
Print "B5=  " ; B5

T = B5 + 8
Zwr3 = 2 ^ 4
T = T / Zwr3
T = T / 10
T_str = Str(t)
T_str = Left(t_str , 4)
Print "T=   " ; T_str ; " C"
Print

'kalkuliere tatsaechlichen Luftdruck
'-------------------------------------------------------------------------------
B6 = B5 - 4000
Print "B6=  " ; B6

Zwr1 = 2 ^ 11
Zwr2 = 2 ^ 12
Zwr3 = B6 / Zwr2
Zwr3 = B6 * Zwr3
Zwr4 = B2 * Zwr3
X1 = Zwr4 / Zwr1
Print "X1=  " ; X1

Zwr1 = 2 ^ 11
Zwr2 = B6 / Zwr1
X2 = Ac2 * Zwr2
Print "X2=  " ; X2

X3 = X1 + X2
Print "X3=  " ; X3

Zwr1 = Ac1 * 4
Zwr1 = Zwr1 + X3
Zwr1 = Zwr1 + 2

If Xx = 1 Then B3 = Zwr1 * 4                                '681
If Xx = 2 Then B3 = Zwr1 * 2                                '1006
If Xx = 3 Then B3 = Zwr1                                    '142
If Xx = 4 Then B3 = Zwr1 / 2                                '720
If Xx = 5 Then B3 = Zwr1 / 4                                '1010(orig)
Print "B3=  " ; B3

Zwr1 = 2 ^ 13
Zwr2 = B6 / Zwr1
X1 = Ac3 * Zwr2
'Print X1
'X1 = Abs(x1)
Print "X1=  " ; X1

Zwr1 = 2 ^ 12
Zwr2 = 2 ^ 16
Zwr3 = B6 / Zwr1
Zwr3 = B6 * Zwr3
Zwr4 = B1 * Zwr3
X2 = Zwr4 / Zwr2
Print "X2=  " ; X2

X3 = X1 + X2
X3 = X3 + 2
X3 = X3 / 4
Print "X3=  " ; X3

Zwr1 = X3 + 32768
Zwr2 = 2 ^ 15
Zwr3 = Zwr1 / Zwr2
'Print "Zwr3= " ; Zwr3
'Print "Ac4 = " ; Ac4

B4a = Ac4 * Zwr3
B4 = Abs(b4a)
Print "B4=  " ; B4a

B7 = Up - B3
Dim B7a As Long
B7a = B7 * 50000
Print "B7=  " ; B7a

Zwr1 = B7a * 2
Zwr1 = Zwr1 / B4
Zwr2 = B7a / B4
Zwr2 = Zwr2 * 2
If B7a < &H8000000 Then P = Zwr1 Else P = Zwr2
Print "P=   " ; P

Zwr1 = 2 ^ 8
Zwr2 = P / Zwr1
X1 = Zwr2 * Zwr2
Print "X1=  " ; X1

Zwr1 = 2 ^ 16
X1 = X1 * 3028
X1 = X1 / Zwr1
X1 = Abs(x1)
Print "X1=  " ; X1

Zwr1 = -7357 * P
Zwr2 = 2 ^ 16
X2 = Zwr1 / Zwr2
Print "X2=  " ; X2
Print

Zwr1 = X1 + X2
Zwr1 = Zwr1 + 3791
Zwr2 = 2 ^ 4
Zwr1 = Zwr1 / Zwr2
P = P + Zwr1
Print "P=   " ; P ; "Pa"
P = P / 100

Print "XX= " ; Xx

Dim P_str As String * 8
P_str = Fusing(p , "#.##")
Print "P=   " ; P_str ; "hPa"

'kalkuliere Hoehenwerte
'-------------------------------------------------------------------------------
Po = 1013.25                                                'Pressure auf Seepegel

Zwr1 = 1 / 5.255
Zwr2 = P / Po
Zwr3 = Zwr2 ^ Zwr1
Zwr4 = 1 - Zwr3
A = 44330 * Zwr4
A2 = Int(a)
Print "A=   " ; A2 ; "m"
Print

'LCD-Ausgabe
'-------------------------------------------------------------------------------
Cls
Locate 1 , 7
Lcd P_str ; "hPa"

Locate 1 , 1
Lcd Up

Locate 2 , 1
Lcd A2 ; "m"

Locate 2 , 11
Lcd T_str ; Chr(223) ; "C"

'Wait 2

Xx = Xx + 1
If Xx = 6 Then Xx = 1

Loop
End

'------------------------------------------------------------
Sub Read_reg
Call Read_bmp(adres , Value)
Hi = Value * 256
Adres = Adres + 1
Call Read_bmp(adres , Value)
Result = Hi + Value
Adres = Adres + 1
End Sub

'----------------------------------------------------------
Sub Write_bmp(byval Adres As Byte , Byval Value As Byte)
I2cstart                                                    'start condition
I2cwbyte Addressw                                           'slave address
I2cwbyte Adres                                              'address of register
I2cwbyte Value                                              'value to write
I2cstop                                                     'stop condition
Waitms 10                                                   'wait for 10 milliseconds
End Sub

'----------------------------------------------------------
Sub Read_bmp(byval Adres As Byte , Value As Byte)
I2cstart                                                    'generate start
I2cwbyte Addressw                                           'slave address
I2cwbyte Adres                                              'address of register
I2cstart                                                    'repeated start
I2cwbyte Addressr                                           'slave address (read)
I2crbyte Value , Nack                                       'read byte
I2cstop                                                     'generate stop
Waitms 10
End Sub