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ASSEMBLY CODE FOR WIRELESS TRANSMISSION USING RF

DIPESH SAPKOTA

i have a project to transmit data wireless using rf modules using 433Mhz....with AT89C51 microcontroller....plz anyone post me a assembly code for this transmission....!!!!!

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  • 0

    this can be changed. it ran at 12MHz not at 433MHz but I think it will be ok.

            mov     dpx, a
        mov     dph, #0
        mov     dpl, #0
        movx    a, @dptr          ; get the first byte on this page
        mov     b, a              ; store it in b
        push    ie
        clr     ea                ; disable interrupts while we write
        clr     a                 ; try to write a 0
        movx    @dptr, a
        nop
        nop
        movx    a, @dptr          ; did it stick?
        jnz     f_eb_isflash
        mov     a, #0FFh          ; now try to write FF
        movx    @dptr, a
        nop
        nop
        movx    a, @dptr          ; did it stick?
        cpl     a
        jz      f_eb_restore      ; if zero, it wrote and must be RAM
        ;
        ; if it didn't stick, it is probably flash.  try to erase.
        ;
f_eb_isflash:
        mov     a, r7
        ROMCALL ROMXT_FLASHSECTORERASE
        pop     ie                ; restore interrupts
        mov     r7, #0
        jc      f_eb_exit
f_eb_fail:
        mov     r7, #1          ; flag failure if carry bit clear

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  • 0

    this can be changed. it ran at 12MHz not at 433MHz but I think it will be ok.

            mov     dpx, a
        mov     dph, #0
        mov     dpl, #0
        movx    a, @dptr          ; get the first byte on this page
        mov     b, a              ; store it in b
        push    ie
        clr     ea                ; disable interrupts while we write
        clr     a                 ; try to write a 0
        movx    @dptr, a
        nop
        nop
        movx    a, @dptr          ; did it stick?
        jnz     f_eb_isflash
        mov     a, #0FFh          ; now try to write FF
        movx    @dptr, a
        nop
        nop
        movx    a, @dptr          ; did it stick?
        cpl     a
        jz      f_eb_restore      ; if zero, it wrote and must be RAM
        ;
        ; if it didn't stick, it is probably flash.  try to erase.
        ;
f_eb_isflash:
        mov     a, r7
        ROMCALL ROMXT_FLASHSECTORERASE
        pop     ie                ; restore interrupts
        mov     r7, #0
        jc      f_eb_exit
f_eb_fail:
        mov     r7, #1          ; flag failure if carry bit clear

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