have a look at the code from 24lcd515.bas which is in the samples folder.
I include it below. it is for a bigger chip but will show that you must manipulate the address.
[code:1:25405c4e38]$regfile = "m88def.dat"
$lib "i2c_twi.lbx"
$crystal = 8000000
$baud = 19200
Config Scl = Portc.5
Config Sda = Portc.4
'connect A0 and A1 to ground, A2 to VCC
Declare Sub Writebyte515(address As Word , Value As Byte)
Declare Function Readbyte515(address As Word) As Byte
Dim B As Byte , Adrs As Word
Dim Hdr As Byte , L As Byte , H As Byte , J As Byte
Dim Choice As Byte , Wstart As Word
Config Twi = 400000
I2cinit
Print "24LC515 EEPROM DEMO"
Do
Input "0-write 10, 1-read 10, 2-read block ,3 clear" , Choice
Select Case Choice
Case 0 'write 10 bytes
For Adrs = 0 To 15
B = Adrs
Writebyte515 Adrs , B 'write value
Next
Case 1 'read 10 bytes
For Adrs = 0 To 15 'read values back
B = Readbyte515(adrs)
Print B 'and show them
Next
Case 2 'read dump
Inputhex "Start $" , Wstart
Hdr = &B10100000
Hdr.3 = Wstart.15 ' A15 address bit
H = High(wstart)
L = Low(wstart)
I2cstart
I2cwbyte Hdr
I2cwbyte H
I2cwbyte L
I2crepstart 'repeated start
Hdr.0 = 1 ' we will read now
I2cwbyte Hdr
For J = 1 To 63
I2crbyte B , Ack 'read byte
Print Hex(b) ; ",";
Next
I2crbyte B , Nack 'read byte
Print Hex(b)
I2cstop
Case 3
For Adrs = 0 To 15
B = &HFF
Writebyte515 Adrs , B 'write value
Next
End Select
Loop
End
'write a byte to the 24LC515 memory
Sub Writebyte515(address As Word , Value As Byte)
Hdr = &B10100000
Hdr.3 = Address.15 ' A15 address bit
H = High(address)
L = Low(address)
I2cstart
I2cwbyte Hdr 'address with A15 segment bit
I2cwbyte H 'MSB
I2cwbyte L 'LSB
I2cwbyte Value
I2cstop
Waitms 10
End Sub
'read a byte from the 24LC515 memory
Function Readbyte515(address As Word) As Byte
Hdr = &B10100000
Hdr.3 = Address.15 ' A15 address bit
H = High(address)
L = Low(address)
I2cstart
I2cwbyte Hdr
I2cwbyte H
I2cwbyte L
I2crepstart 'repeated start
Hdr.0 = 1 ' we will read now
I2cwbyte Hdr
I2crbyte Readbyte515 , Nack 'read byte
I2cstop
End Function
[/code:1:25405c4e38]
↧