📄 spi.asm
字号:
PRINTSTR MACRO X
push dx
push ax
LEA DX,X
MOV AH,09H
INT 21H
pop ax
pop dx
ENDM
.model small
.586
.stack 100
.stack
.data
SPIBAR dd 0
bit2 equ 04h
bit0 equ 01h
err1 db 'There is an error!$'
enters db 10,13,'$'
space1 db ' $'
data1 db 4096 dup(0)
.code
.startup
push es
xor ax,ax
mov es,ax
call Get_RCRB
add eax,3020h
mov SPIBAR,eax
mov edx,0ffff0000h ;address
mov si,offset data1
call read_sector
mov si,offset data1
mov cx,100h
show1: mov al,[si]
call show_al
printstr space1
inc si
loop show1
mov eax,spibar
call Init_SPI_Erase
call Set_BIOS_EN
call write_status
call read_status
mov ebx,spibar
add ebx,08h
mov al,es:[ebx]
call show_al
and al,00011100b
cmp al,0
jne error1
call set_sector_erase_com
call set_program_com
jmp end1
error1: printstr err1
printstr enters
end1: pop es
.exit
Get_RCRB proc ;output: eax
mov eax,8000f8f0h
mov dx,0cf8h
out dx,eax
mov dx,0cfch
in eax,dx
and eax,not bit0
ret
Get_RCRB endp
Init_SPI_Read proc ;input:es = 00h, eax;
mov ebx,eax
add ebx,58h
mov dword ptr es:[ebx],0ab0bh ;opcode menu
mov ebx,eax
add ebx,56h
mov word ptr es:[ebx],02h ;opcode type
mov ebx,eax
add ebx,54h ;prefix opcode configuration register
mov word ptr es:[ebx],0006h
ret
Init_SPI_Read endp
;==========================================
;input: eax: spi address; si: memory start address; edx: sector address
read_sector proc
push edi
call Init_SPI_Read
and edx,0fffff000h
mov cx,64
store:
mov ebx,eax
or word ptr es:[ebx],bit2 ;clear cycle done
add ebx,04h
mov dword ptr es:[ebx],edx
sub ebx,02h
mov word ptr es:[ebx],7f06h
mov ebx,eax
@@: mov ax,word ptr es:[ebx] ;finish??
test ax,bit2
jz @B
push cx
mov ebx,spibar
add ebx,08h
mov cx,16
store1: mov edi,dword ptr es:[ebx]
mov [si],edi
add si,4
add ebx,4
loop store1
pop cx
add edx,64
loop store
pop edi
ret
read_sector endp
Init_SPI_Erase proc ;input:es = 00h, eax;
mov ebx,eax
add ebx,58h
mov dword ptr es:[ebx],0a1010506h ;opcode menu
add ebx,04h
mov dword ptr es:[ebx],02d7f1h
mov ebx,eax
add ebx,56h
mov word ptr es:[ebx],3d11h ;opcode type
mov ebx,eax
add ebx,54h ;prefix opcode configuration register
mov word ptr es:[ebx],0006h
ret
Init_SPI_Erase endp
Set_BIOS_EN proc
mov eax,8000f8dch
mov dx,0cf8h
out dx,eax
mov dx,0cfch
in al,dx
or al,01h
out dx,al
ret
Set_BIOS_EN endp
write_status proc
mov ebx,spibar
add ebx,00h
or word ptr es:[ebx],bit2 ;clear cycle done
add ebx,08h
mov byte ptr es:[ebx],02h
mov ebx,spibar
add ebx,02h ;control configuration
mov word ptr es:[ebx],4026h ;
mov ebx,spibar
@@: mov ax,word ptr es:[ebx] ;finish??
test ax,bit2
jz @B
ret
write_status endp
read_status proc
;read spi device status
mov ebx,spibar
or word ptr es:[ebx],bit2 ;clear cycle done
add ebx,02h
mov word ptr es:[ebx],4016h
mov ebx,spibar
@@: mov ax,word ptr es:[ebx] ;finish??
test ax,bit2
jz @B
ret
read_status endp
set_sector_erase_com proc
;;========== set erase command
mov ebx,spibar
or word ptr es:[ebx],bit2 ;clear cycle done
mov ebx,spibar
add ebx,04h
mov dword ptr es:[ebx],0ff0000h
mov ebx,spibar
add ebx,02h
mov word ptr es:[ebx],56h
mov ebx,spibar
@@: mov ax,word ptr es:[ebx] ;finish??
test ax,bit2
jz @B
ret
set_sector_erase_com endp
set_program_com proc
;;========== set program command
mov ebx,spibar
add ebx,04h
mov dword ptr es:[ebx],0ff0000h ;address
add ebx,04h
mov dword ptr es:[ebx],'cniV' ;data0
add ebx,04h
mov dword ptr es:[ebx],'_tne' ;data1
add ebx,04h
mov dword ptr es:[ebx],'uW' ;data2
mov ebx,spibar
add ebx,02h
mov word ptr es:[ebx],4b66h
mov ebx,spibar
@@: mov ax,word ptr es:[ebx] ;finish??
test ax,bit2
jz @B
ret
set_program_com endp
show_al proc far public
push ax
push dx
mov dh,al
and al,0f0h
shr al,4
add al,30h
cmp al,3ah
jb doing
add al,7
doing: mov dl,al
mov ah,2
int 21h
mov al,dh
and al,0fh
add al,30h
cmp al,3ah
jb doing1
add al,7
doing1: mov dl,al
mov ah,2
int 21h
pop dx
pop ax
ret
show_al endp
end
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