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單片機源程序如下:
- ;@ by yangzhenshang
- ;@ email:yangzhenshang@hotmail.com
- ;@ 2003.7.20
- keydata equ 30h
- org 00h
- main:
- mov keydata,#0
- mov tmod ,#09h
- mov r7,#0
- mov r6,#0
- jb p3.2,$
- again:
- mov tl0,#0
- mov th0,#0
- setb tr0
- jnb p3.2,$
- jb p3.2,$
- clr tr0
- mov a,th0
- clr c
- subb a,#12
- jc again
- mov a,#14
- clr c
- subb a,th0
- jc again ;seaching start bit: 3.6ms
- nextbit:
- mov tl0,#0
- mov th0,#0
- setb tr0
- jnb p3.2,$
- jb p3.2,$
- clr tr0
- mov a,th0
- clr c
- subb a,#8
- jc next ;;;;;;;;;;if <2.2ms
- mov a,#10
- clr c
- subb a,th0
- jc again ;;;;;;;if >2.7ms
- mov a,keydata
- setb c ;bit = 1
- rrc a
- mov keydata,a
- inc r7
- cjne r7,#8,nextbit
- inc r6
- cjne r6,#2,last8
- sjmp seach
- last8:
- mov keydata+1,a
- mov r7,#0
- sjmp nextbit
- next:
- mov a,th0
- swap a
- mov r1,a
- anl tl0,#0f0h
- mov a,tl0
- clr c
- rrc a
- rrc a
- rrc a
- rrc a
- add a,r1
- mov r1,a
- subb a,#30
- jc nextbit ; if <0.84ms
- mov a,r1
- clr c
- cjne a,#64,continue
- continue:
- jnc nextbit ; if >1.11ms
- mov a,keydata
- clr c ;bit = 0
- rrc a
- mov keydata,a
- inc r7
- cjne r7,#8,nextbit
- inc r6
- cjne r6,#2,last_8
- sjmp seach
- last_8:
- mov keydata+1,a
- mov r7,#0
- sjmp nextbit
- seach:
- mov r0,#-2 ;pointer
- mov r1,#-1 ;counter
- seach1:
- inc r0
- seach2: inc r0
- inc r1
- cjne r1,#29,compare
- sjmp exit0
- compare:
- mov a,r0
- mov dptr,#keycode
- movc a,@a+dptr
- cjne a,keydata,seach1
- inc r0
- mov a,r0
- mov dptr,#keycode
- movc a,@a+dptr
- cjne a,keydata+1,seach2
- mov p1,r1 ;output to p1
- send:
- mov tmod,#20h ; timer 1,mode 2
- mov tl1,#0fdh
- mov th1,#0fdh
- mov scon,#01010000b;9600,8,1,0
- setb tr1
- loop_s:
- mov sbuf,r1 ;send to the serial port of computer
- jnb ti,$
- clr ti
- exit0:
- ljmp main
- keycode:
- db 11111000b,00000000b, 11111100b,00000000b, 11111001b,11000000b
- db 11111100b,11000000b, 11111010b,00000000b, 11111010b,00100000b
- db 11111010b,01000000b, 11111010b,01100000b, 11111010b,10000000b
- db 11111010b,10100000b, 11111010b,11000000b, 11111010b,11100000b
- db 11111011b,00000000b, 11111011b,00100000b, 11111011b,01000000b
- db 11111011b,01100000b, 11111111b,01100000b, 11111111b,10100000b
- db 10001100b,10001110b, 10001101b,11101110b, 10001100b,10101110b
- db 10001101b,11001110b, 11111000b,11100000b, 11111100b,10000000b
- db 11111100b,01000000b, 11111001b,10100000b, 11111100b,10100000b
- db 11111100b,01100000b
- end
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