Here is the ACK code again...
-------------------------------------------------------------
I2CACKWAIT:
__________SETB__I2CPORTSDA ; Set SDA as INPUT
__________SETB__I2CPORTHCK ; HCK = 1
__________MOV___R0,#I2CTIMEWAIT ; = 30
__________MOV___R1,#0
ACKLOOP:__JNB___I2CPORTSDA,ACKOK0 ; Skip if SDA = 1
__________DJNZ__R1,ACKLOOP
__________DJNZ__R0,ACKLOOP
__________CLR___I2CPORTHCK ; HCK = 0
__________MOV__A,#1 ; NOK
__________RET
ACKOK0:___CLR___I2CPORTHCK ; HCK = 0
__________MOV___A,#0 ; OK
__________RET
-------------------------------------------------------------