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【正文】 了在中斷的外邊用顯示功能回事中斷的返回出問題，導(dǎo)致程序跑飛掉。這個(gè)題目做下來還是有不少收獲的，至少經(jīng)驗(yàn)上要多了一些。8253io地址ioport_82531 equ ioport+0281hioport_82533 equ ioport+0283hio82550 equ ioport+0290hio82551 equ ioport+0291h 。點(diǎn)陣控制地址ioportRy equ ioport+02a8hint_vect EQU 72H 。中斷掩碼,中斷07 時(shí)從低至高相應(yīng)位為零,中斷815 時(shí)第2 位為零irq_mask_9_15 equ 11111011b。tpc 卡中9054 芯片的io 地址data segmentcsreg dw ?ipreg dw ? 。中斷計(jì)數(shù)buffer0 db 00h,01h,02h,03h,04h,05h,06h,07hbuffer1 db 10h,38h,10h,10h,10h,20h,7eh,20hgewei dw 0shiwei dw 0Led db 3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh。display39。$39。interrupt !!!!!! 39。$39。Enable Local Interrupt Inputstart:climov ax,datamov ds,axmov es,axmov ax,stacksmov ss,axmov dx,ioport_cent+68h 。保存原中斷向量mov ah,35hint 21hmov ax,esmov csreg,axmov ipreg,bxmov ax,cs 。設(shè)置中斷掩碼and al, irq_mask_2_7out 21h, alin al, 0a1hand al, irq_mask_9_15out 0a1h, almov ax,datamov ds,ax。8253初始化部分mov dx,ioport_82533mov al,36hout dx,almov dx,ioport_82530mov ax,1000out dx,almov al,ahout dx,almov dx,ioport_82533mov al,76hout dx,almov dx,ioport_82531mov ax,1000out dx,almov al,ahout dx,al。開中斷beg: mov irq_times,36go1: cmp irq_times,26 jl go2 mov ax,irq_times sub ax,26 call disp mov al,24h 。箭頭顯示橫向紅，列項(xiàng)綠 xlat mov dx,ioportC out dx,al mov al,ah cmp 20h,ah jb next0 mov dx,ioportRy out dx,alnext1:mov dx,ioportRr shl,ah inc si push cx mov cx,0fffhloop1:loop 1oop1 pop cx loop d1 jmp lllgo2: cmp irq_times,23 jl go3 mov ax,irq_times sub ax,23 call leddisp mov al,0 mov dx,io82550 out dx,al mov dx,ioportC out dx,al cmp irq_times,24 je turn jmp go2turn: mov al,44h 。箭頭閃爍顯示橫向紅，列項(xiàng)綠 xlat mov dx,ioportC out dx,al mov al,ah cmp 20h,ah jb next0 mov dx,ioportRy out dx,alnext2:mov dx,ioportRr shl,ah inc si push cx mov cx,0fffhloop2:loop 1oop2 pop cx loop d2 jmp lllbeg_mid: jmp beggo3: cmp irq_times,3 jl go4 mov ax,irq_times sub ax,3 call leddisp 。箭頭顯示橫向綠，列項(xiàng)紅 xlat mov dx,ioportC out dx,al mov al,ah cmp 20h,ah jb next0 mov dx,ioportRr out dx,al
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