请问有没有做过ADUC812的SPI总线编程的，求教

swf1999 · 发表于 2005-1-18 16:07:30

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我编了一个SPI总线的程序，两块硬件都是ADUC812
但主机始终无法将数据传送给从机，但从机的数据却可以传送给主机
硬件连接良好，估计是程序问题，我实在找不出错误，请大虾帮我看看，程序很短的
或者能否提供确实能用的程序让我参考一下，谢谢
主机：
$MOD812       ; Use 8052 & ADuC812 predefined symbols
SS    EQU    P3.5          ; P3.5 drives slave device's SS pin
ORG 0000h
      LJMP    MAIN          ; jump to main program
ORG 003Bh ; (.................... SPI ISR)
      SETB SS             ; pull slave's SS pin high
      MOV    A,SPIDAT
CLR C
      RETI
;====================================================================
                                                   ; MAIN PROGRAM
ORG 004Bh
MAIN:
SETB EA
MOV IE2,#01H
MOV SPICON,#30H
MASTER:
JB P3.4,$
CLR SS
NOP
NOP
NOP
NOP
SETB C
MOV SPIDAT,#0AAH
JC $
LJMP MASTER
; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
DELAY:       ; delays approximately 100ms
      PUSH ACC
      PUSH B
      MOV    A,#200       ; 200 * 500us = 100ms
DLY1: MOV    B,#229       ; 229 * 2.17us = 500us
      DJNZ B,$          ; sit here for 500us
      DJNZ ACC,DLY1       ; repeat 200 times (100ms delay)
      POP    B
      POP    ACC
      RET

END
从机：
$MOD812       ; Use 8052 & ADuC812 predefined symbols
SS    EQU    P3.5          ; P3.5 drives slave device's SS pin
ORG 0000H
      LJMP    MAIN          ; jump to main program
ORG 0013H
CLR SPE
SETB SPE
MOV SPIDAT,#0BBH
SETB P3.2
RETI
ORG 003BH
MOV A,SPIDAT
SETB P3.5
CLR C
RETI
;====================================================================
                                                   ; MAIN PROGRAM
ORG 004Bh
MAIN:
SETB P3.5
SETB EA
MOV IE2,#01H
SETB EX0
MOV SPICON,#20H
CLR P1.5
SLAVE:
CLR P3.5
JB P1.5,$
CLR P3.2
SETB C
JC $
LJMP SLAVE
; - - - - - - - - - - - - - - -POST http://eetop.cn/cgi-bin/post.cgi HTTP/1.0
P    ; delays approximately 100ms
      PUSH ACC
      PUSH B
      MOV    A,#200       ; 200 * 500us = 100ms
DLY1: MOV    B,#229       ; 229 * 2.17us = 500us
      DJNZ B,$          ; sit here for 500us
      DJNZ ACC,DLY1       ; repeat 200 times (100ms delay)
      POP    B
      POP    ACC
      RET

END