I2c

[Mark Scotford]

Can somebody help me please with some sample code. I have not used I2C before and I need to store a variable (B28), with a value between 1-9999 in an external memory EEPROM device, 24A65. All of the device address pins are held down to ground. My code does not work, please can you help.

HOME1:
I2CREAD PORTB.4,PORTB.5,%10100000,#B28
B28 = B28 + 1
PAUSE 500
I2CWRITE PORTB.4,PORTB.5,%10100000,#B28
LCDOut $FE,1,#B28
PAUSE 500
GOTO HOME1

Thanking you in anticipation.
Mark in Spain

[NavMicroSystems]

Mark,

try the following:

B28 var word
Adr VAR Byte

B28=1245 ' Value to write
Adr=0 ' EEPROM Location to write to


I2CWRITE PORTB.4,PORTB.5,%10100000,Adr,[B28]
Pause 50
I2CREAD PORTB.4,PORTB.5,%10100000,Adr[B28]

PAUSE 50

LCDOut $FE,1,DEC5 B28
PAUSE 1000

For reference see PBP Manual Section 5.34 & 5.35

regards

Ralph

[Mark Scotford]

Thanks Ralph, now I understand.