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FND(assembly)

FND(assembly). Code description. 20072413 박민호. Code - main. FND. LOOP: LDI R16, 0xFF ;R16 = 0xFF STS DIG_SELECT, R16 ;FND_CS = R16 LDI R16, 0xFF ;R16 = 0xFF STS FND_DATA, R16 ;FND_DATA = R16 LDI R17, 0x00 ;R17 = 0x00 LOOP1: MOV R16, R17 ;R16 = R17

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FND(assembly)

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  1. FND(assembly) Code description • 20072413박민호

  2. Code - main FND LOOP: LDI R16, 0xFF ;R16 = 0xFF STS DIG_SELECT,R16 ;FND_CS = R16 LDI R16, 0xFF ;R16 = 0xFF STS FND_DATA, R16 ;FND_DATA = R16 LDI R17, 0x00 ;R17 = 0x00 LOOP1: MOV R16, R17 ;R16 = R17 CALL BIN2LED ;call BIN2LED subroutine STS FND_DATA, R16 ;FND_DATA = R16 CALL D50MS ;call D50MS subroutine INC R17 ;R17++ CPI R17, 0x10 ;(R17==0x10)? BRNE LOOP1 ;다르면 goto LOOP1 LDI R16, 'H' ;R16 = 'H' CALL BIN2LED ;call BIN2LED subroutine STS FND_DATA, R16 ;FND_DATA = R16 CALL D50MS ;call D50MS subroutine LDI R16, '-' ;R16 = '-' CALL BIN2LED ;call BIN2LED subroutine STS FND_DATA, R16 ;FND_DATA = R16 CALL D50MS ;call D50MS subroutine LDI R16, '.' ;R16 = '.' CALL BIN2LED ;call BIN2LED subroutine STS FND_DATA, R16 ;FND_DATA = R16 CALL D50MS ;call D50MS subroutine LDI R16, ''' ;R16 = ''' CALL BIN2LED ;call BIN2LED subroutine STS FND_DATA, R16 ;FND_DATA = R16 CALL D50MS ;call D50MS subroutine JMP LOOP ;goto LOOP 출처 : 수업자료

  3. Code - bin2led FND BIN2LED: PUSH R17 PUSH ZH PUSH ZL CPI R16, 'H' BRNE BIN2L1 LDI R16, 0x10 RJMP BIN2L4 BIN2L1: CPI R16, '-' BRNE BIN2L2 LDI R16, 0x11 RJMP BIN2L4 ... BIN2L4: LDI R17, byte3(FND_TABLE << 1) LDI ZH, high(FND_TABLE << 1) LDI ZL, low(FND_TABLE << 1) ADD ZL, R16 CLR R16 ADC ZH, R16 ADC R17, R16 OUT RAMPZ, R17 LPM R16, Z POP ZL POP ZH POP R17 RET FND_TABLE: .db 0b11000000, 0b11111001 ; 0, 1 .db 0b10100100, 0b10110000 ; 2, 3 .db 0b10011001, 0b10010010 ; 4, 5 .db 0b10000010, 0b11011000 ; 6, 7 .db 0b10000000, 0b10010000 ; 8, 9 .db 0b10001000, 0b10000011 ; a, b .db 0b11000110, 0b10100001 ; c, d .db 0b10000110, 0b10001110 ; e, f .db 0b10001001, 0b10111111 ; H, - .db 0b01111111, 0b11111111 ; ., ' RAMPZ 레지스터와 함께 z-pointer를 초기화해주기 위한 작업이다. 여기서는 LPM을 사용하므로, RAMPZ가 필요없다. 따라서 LDI R17, byte3(FND_TABLE<<1) ADC R17, R16 OUT RAMPZ, R17 이 세 줄은 없어도 상관없음!! ;첫 번째 바이트 더한 캐리를 두 번째 바이트에 더함 ;두 번째 바이트 더한 캐리를 세 번째 바이트에 더함 ;세 번째로 올라온 캐리를 RAMPZ set하는데 사용 출처 : 수업자료

  4. Sstate in memory FND 2x FND_TABLE: .db 0b11000000, 0b11111001 ; 0, 1 .db 0b10100100, 0b10110000 ; 2, 3 .db 0b10011001, 0b10010010 ; 4, 5 .db 0b10000010, 0b11011000 ; 6, 7 .db 0b10000000, 0b10010000 ; 8, 9 .db 0b10001000, 0b10000011 ; a, b .db 0b11000110, 0b10100001 ; c, d .db 0b10000110, 0b10001110 ; e, f .db 0b10001001, 0b10111111 ; H, - .db 0b01111111, 0b11111111 ; ., '

  5. Thank you FND Q&A

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