;
; buffer/parse whole strings and decide whether to send to card or not.
-;
+; #######
+; defines
+; #######
+
+; baudrate = clock freq / etu
+; std smartcard etu: 372
+; other smartcards: 625
+.define clock 8000000
+.define clk_h 4000000
+.define etu 625
+.define etu_h 312
+.define baudrate 5 ; UBRR value for 76800 bits/s (8mhz clock)
+
+; names for registers
+.define tmp r16
+.define bitcount r17
+.define tmp1 r18
+.define tmp2 r19
+.define byte r20
+.define overflow_counter r21
+.define counter_l r22
+.define counter_h r23
+.define state r24
+.define state_m r25
+.define mode r26
+.define counter_l_tmp r27
+.define counter_h_tmp r28
+.define one r1
+.define zero r0
+
+; state
+.define LOW (1<<0)
+.define LOW_F 1
+.define HIGH (1<<1)
+.define HIGH_F 2
+; mode
+.define STUPID (1<<0) ; forward cam <-> card communication
+.define STUPID_F 1
+.define COOL (1<<1) ; send time (clocks) & state via uart
+.define COOL_F 2
+.define ELITE (1<<2) ; create bytes, maybe even whole command arrays
+.define ELITE_F 3
+.define GODLIKE (1<<3) ; filter and mask for commands to card - send rejected via uart only
+.define GODLIKE_F 4
+.define INCREDIBLE_HACK (1<<4) ; destroy all your hardware
+.define INCREDIBLE_HACK_F 5
+
+; but there is only stupid and cool mode right now %)
+
+
+; #############
+; programm code
+; #############
+
+; ------------------
; interrupt vectors:
-;
+; ------------------
; reset
rjmp INIT
; analog comparator
reti
-;
+; ------------
; init routine
-;
-
-MAIN:
-rjmp MAIN
+; ------------
INIT:
; set stackpointer
-ldi r16,low(RAMEND)
-out SPL,r16
+ldi tmp,low(RAMEND)
+out SPL,tmp
; enable interrupts int0,int1
-ldi r16,((1<<INT0)|(1<<INT1))
-out GIMSK,r16
+ldi tmp,((1<<INT0)|(1<<INT1))
+out GIMSK,tmp
; int0/1 setup
-ldi r16,((1<<ISC01)|(1<<ISC00)|(1<<ISC10)|(1<<ISC11))
-out MCUCR,r16
+ldi tmp,((1<<ISC01)|(0<<ISC00)|(1<<ISC11)|(0<<ISC10))
+out MCUCR,tmp
; enable t/c overflow interrupt and icp
-ldi r16,((1<<TOIE1)|(1<<TICIE1))
-out TIMSK,r16
+ldi tmp,((1<<TOIE1)|(1<<TICIE1))
+out TIMSK,tmp
; setup t/c and icp
-ldi r16,((1<<CS12)|(1<<CS11)|(1<<CS10)|(1<<ICNC1))
-out TCCR1B,r16
+ldi tmp,((1<<CS12)|(1<<CS11)|(1<<CS10)|(1<<ICNC1)|(0<<ICES1))
+out TCCR1B,tmp
; configure uart - interrupt enabled when i/o
-ldi r16,3
-out UBRR,r16
+ldi tmp,baudrate
+out UBRR,tmp
sbi UCR,TXEN
-; init bitcounter and overflow counter
-ldi r20,0 ; bitcounter
-ldi r21,0 ; register for constructing the byte
-ldi r22,0 ; overflow counter
-ldi r23,0 ; temp reg
-
-; constant 1 in r1
-ldi r16,1
-mov r1,r16
+; init registers
+ldi bitcounter,0
+ldi byte,0
+ldi overflow_counter,0
+ldi tmp1,0
+ldi tmp2,0
+ldi counter_l,0
+ldi counter_h,0
+ldi state,HIGH ; .. as waiting for falling edge of start bit
+ldi state_m,0x03
+ldi mode,(STUPID|COOL)
+ldi counter_l_tmp,0
+ldi counter_h_tmp,0
+ldi tmp,1
+mov one,tmp
+ldi tmp,0
+mov zero,tmp
; enable interrupts (global)
sei
; jump to mainloop
rjmp MAIN
-;
+; ------------
; main routine
-;
+; ------------
MAIN:
+; loop and wait for interrupts
rjmp MAIN
-;
-; rec_card routines
-;
+; ----------------
+; rec_card routine
+; ----------------
REC_CARD:
-; decide what to do
-sbic PORTD,PD6
-rjmp REC_CARD_HIGH
-rjmp REC_CARD_LOW
-
-REC_CARD_HIGH:
-
; save counter
-in r24,ICR1L
-in r25,ICR1H
+in counter_l,ICR1L
+in counter_h,ICR1H
-; output high on port to cam
-sbi PORTD,PD3
+; toggle state
+eor state,state_m
; toggle icp sense
-cbi TCCR1B,ICES1
-;in r16,TCCR1B
-;cbr r16,ICES1
-;out TCCR1B,r16
+rcall TOGGLE_ICP_SENSE
-; status tu submit
-ldi r26,1
+; fwd to cam if in stupid mode
+sbrc mode,STUPID_F
+rcall FWD_TO_CAM
-; enable uart dre interrupt
-sbi UCR,UDRIE
+; 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
-reti
+; send time and state via uart
+sbrc mode,COOL_F
+rcall SEND_TO_UART ; -> prepare date & enable uart dre interrupt (sbi UCR,UDRIE)
-REC_CARD_LOW:
+; return
+reti
-; save counter
-in r27,ICR1L
-in r28,ICR1H
+; ------------------------
+; toggle_icp_sense routine
+; ------------------------
-; output low on port to cam
-cbi PORTD,PD3
+TOGGLE_ICP_SENSE:
-; toggle icp sense
+; toggle according to state
+cbi TCCR1B,ICES1
+sbrs state,HIGH
sbi TCCR1B,ICES1
-; status to submit
-ldi r26,0
+; return
+ret
-; enable uart dre interrupt
-sbi UCR,UDRIE
+; ------------------
+; fwd_to_cam routine
+; ------------------
-reti
+; output state on port to cam
+mov tmp,state
+andi tmp,HIGH
+lsl tmp ; as we have to set pd3 (dirty, shorter way?)
+sbi DDRD,DDD3
+out PORTD,tmp ; <- hunz: low or high if pd3 bit is set ?
+
+; return
+ret
+
+
+; zzZZzZzZZZ .... hier gehts weiter !!!
;
; rec_cam routines
projects / my-code / atmel.git / blobdiff