Start:
   LDI R16, 0xFF;11111111
   OUT DDRA, R16; PORTA НА ВЫВОД
   OUT DDRB, R16
   ;LDI R16, 0xF; 00001111: PC0-PC3 на ввод
   OUT DDRC,R16
   ;LDI R16, 0x00; PORTD на ввод
   OUT DDRD, R16

   KEK:
   CALL delay
   IN R21, PIND
   CPI R21,0
   BRNE moving
   CPI R20, 0;x
   BREQ KEK

   moving:
   MOV R20,R21
   CPI R20,0
   BREQ KEK

   OUT PORTA, R20

   MOV R29, R20
   LSR R29
   LSR R29
   LSR R29
   LSR R29
   LSR R29
   LSR R29
   LSR R29

   ;ОБРАТНЫЙ КОД
   MOV R30,R20
   LDI R16,0XFF
   EOR R30, R16
   OUT PORTB, R30

   KEK1:
   CALL delay
   IN R27, PINC
   CPI R27,0
   BRNE moving1
   CPI R26, 0
   BREQ KEK1

   moving1:
   MOV R26,R27
   CPI R26,0
   BREQ KEK1

   CPI R26, 1;PC0
   BREQ INCR
   CPI R26, 2;PC1
   BREQ DOP2
   CPI R26, 4;PC2
   BREQ DOP1
   CPI R26, 8;PC3
   BREQ LEFT

   INCR:
   CPI R29,0
   BRNE DECR
   INC R20
   RJMP PRINT

   DECR:
   DEC R20
   RJMP PRINT

   DOP2:
   LDI R16,0XFF
   EOR R20, R16
   INC R20
   RJMP PRINT

   DOP1:
   LDI R16,0XFF
   EOR R20, R16
   RJMP PRINT

   LEFT:
   LSL R20
   RJMP PRINT

   PRINT:
   OUT PORTA, R20
   MOV R30,R20
   LDI R16,0XFF
   EOR R30, R16
   OUT PORTB, R30
   rjmp PRINT

   delay:
   LDI R25, 4; z
   LDI R24, 14; y
   LDI R23, 156; x
   delay_sub:
   DEC R23
   BRNE delay_sub
   SBIW R24, 1
   BRNE delay_sub
   ret