;Ports Used for I2C Communication sda equ P0.0 scl equ P0.1 ;Start Condition for I2C Communication startc: clr scl setb sda nop nop setb scl nop nop clr sda ret ;Stop Condition For I2C Bus stop: nop nop clr sda setb scl nop nop setb sda nop nop clr scl ret ;Sending Data to slave on I2C bus ;with Acknowledgement send: mov r7,#08 back: clr scl nop nop nop rlc a mov sda,c setb scl nop nop nop clr scl nop nop nop djnz r7,back setb sda setb scl nop nop nop nop clr scl nop nop nop ret ;Receiving Data from slave on I2C bus ;with Acknowledgement recv: mov r7,#08 back2: setb sda setb scl nop nop nop mov c,sda rlc a clr scl nop nop nop djnz r7,back2 setb sda clr scl nop nop nop clr sda setb scl nop nop nop clr scl nop nop nop mov @r0,a inc r0 ret
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