ADB_SET_STATE_ACKON
ADB_SET_STATE_ACKON(); /* start ACK to ADB chip */
ADB_SET_STATE_ACKON(); /* start ACK to ADB chip */
ADB_SET_STATE_ACKON(); /* tell ADB byte ready
ADB_SET_STATE_ACKON(); /* signal byte ready to shift */
ADB_SET_STATE_ACKON(); /* tell ADB byte ready to shift */
ADB_SET_STATE_ACKON(); /* send ACK to ADB chip */