+; save counter
+In counter_l,ICR1L
+in counter_h,ICR1H
+
+; toggle state
+eor state,state_m
+
+; toggle icp sense
+rcall TOGGLE_ICP_SENSE
+
+; fwd to cam if in stupid mode
+sbrc mode,STUPID_F
+rcall FWD_TO_CAM
+
+; calculate delta clocks if in stupid mode
+sbrc mode,COOL_F
+rcall CALC_DELTA_CLOCK ; -> calc delta, store to counter_l_tmp, counter_h_tmp
+
+; send time and state via uart
+sbrc mode,COOL_F
+rcall PREPARE_UART
+
+; return
+reti
+
+; ------------------------
+; toggle_icp_sense routine
+; ------------------------
+
+TOGGLE_ICP_SENSE:
+
+; toggle according to state
+in tmp,TCCR1B
+cbi tmp,ICES1
+sbrs state,HIGH ; maybe toggle according to TCCR1B?
+sbi tmp,ICES1
+out TCCR1B,tmp
+
+; return
+ret
+
+; ------------------
+; fwd_to_cam routine
+; ------------------
+
+FWD_TO_CAM:
+
+; disable external interrupt 1 while toggling edge
+in tmp,GIMSK
+cbr tmp,INT1
+out GIMSK,tmp
+
+; output state on port to cam
+in tmp1,PORTD
+sbr tmp1,PD3
+sbrs state,HIGH_F
+cbr tmp1,PD3
+
+; configure as output and push-pull low/high
+sbi DDRD,DDD3
+out PORTD,tmp1;
+
+; reenable external interrupt 1
+cbr tmp,INT1
+out GIMSK,tmp
+
+; return
+ret
+
+; --------------------
+; prepare_uart routine
+; --------------------
+
+PREPARE_UART:
+
+; by now just send state and counter, so there is no data to prepare
+
+; enable uart data register empty interrupt
+sbi UCR,UDRIE
+
+; return
+ret
+
+
+; ---------------
+; rec_cam routine
+; ---------------
+
+REC_CAM:
+
+; first thing - pullup on
+cbi DDRD,DDD3
+sbi DDRD,PD3
+
+; save counter
+in counter_l,ICR1L
+in counter_h,ICR1H
+
+; toggle state
+eor state,state_m
+
+; toggle int sense
+rcall TOGGLE_INT_SENSE
+
+HIER FEHLT NOCH VIEL ...
+
+; return
+reti
+
+; ------------------------
+: toggle_int_sense routine
+; ------------------------
+
+TOGGLE_INT_SENSE:
+
+in tmp,MCUCR
+cbr tmp,ISC10
+sbis state,HIGH_F
+sbr tmp,ISC10
+out MCUCR,tmp
+
+; return
+ret
+
+; -------------------
+; t1_overflow routine
+; -------------------
+
+T1_OVERFLOW:
+
+; increment counter overflow
+add overflow_counter,one
+
+; return
+reti
+
+; ---------------
+; rst_cam routine
+; ---------------
+
+RST_CAM:
+
+; pull down rst from card
+sbi DDRD,DDD4
+cbi PORTD,PD4
+
+; jump to init
+rjmp INIT
+
+; ----------------
+; uart_out routine
+; ----------------
+
+UART_OUT:
+
+; disable uart data register empty interrupt
+cbi UCR,UDRIE
+
+; init counter
+mov address_l,zero
+
+; send the data
+rcall UART_SEND
+
+; return
+reti
+
+.... wahhh ! zzZz