Quá trình hình thành giáo trình phương pháp giao tiếp giữa khối phối ghép bus với bộ vi xử lý AMD trong mainboard p7 ppsx

* Lưu đồ chương trình truyền dữ liệu.

BEGIN

KHỞI PHÁT: GHI
TỪ CHẾ ĐỘ
GHI LỆNH :
DTR, TxEN
ĐỌC TRẠNG THÁI:
DSR, TxRDy
Kiểm tra sẵn
sàng :DSR=
TxRDY=1

GHI SỐ
LIỆU RA
GHI LỆNH PHÁT: RTS

END

* Lưu đồ chương trình nhận dữ liệu.

BEGIN

KHỞI PHÁT: GHI
TỪ CHẾ ĐỘ
GHI L
ỆNH :

DTR, RxEN,RTS
ĐỌC TRẠNG THÁI:

DSR, RxRDy
Kiểm tra sẵn
sàng :DSR=
RxRDY=1

ĐỌC SỐ LIỆU TỪ
THANH GHI ĐỆM
SỐ LIỆU
END

3. CHệễNG TRèNH.
a. Chửụng trỡnh khụỷi taùo 8251A.
MOV DX, 0FFF2h
MOV AL,00h
OUT DX,AL
MOV CX 2h

D0 : LOOP D0
OUT DX, AL
D1: MOV CX,2h
LOOP D1
OUT DX, AL
MOV CX,2h
D2: LOOP D2
MOV AL, 40h
OUT DX, AL
MOV CX, 2h
D3: LOOP D3
MOV AL, 11001110B
OUT DX, AL
MOV CX, 2h
D4: LOOP D4
MOV CX, 6500h
MOV AL,03h
OUT 01h


Chửụng trỡnh truyen dửừ lieọu.
;chuong trinh truyen du lieu
org 70000h
mov dx 02h ;dia chi thanh ghi dieu khien
mov al,00h
out dx,al ;xoa thanh ghi dieu khien
call delay

out dx,al
call delay

out dx,al
call delay

mov al,40h ; goi 40h vao al, gia tri cua bit RI
out dx,al ;de xoa thanh ghi noi
call delay
mov al,0cdh ; ghi loi dieu khien che do vao
out dx,al ;thanh ghi dieu khien che do
call delay
mov cx,6500h ; dia chi dieu khien
mov al,03h ; ghi tu che do DTR(D1=1),TxEN(D0=1)
out dx,al
call delay
x1: in al,dx
and al,81h ; kiem tra trang thai
cmp al,81h
jnz x1
mov dx,cx
mov al,m
mov bl,al ; nap byte dia chi tap vao bl
mov dx,00h
out dx,al ;gui byte dia chi thap
call delay

mov al,21h ; ghi tu lenh DTS(D5),TxEN(D0) de truyen
mov dx,01h
out dx,21h
call delay
inc cx ;tang dia chi de lay byte ke tiep

mov al,03h
out dx,al
call delay
mov dx,01h
x2: in al,dx
and al,81h
cmp al,81h
jnz x2
mov dx,00h
in al,dx
mov dx,cx
mov al,m
mov bh,al ;nap dia chi cao vao bh
out dx,al ;truyen byte dia chi cao
call delay
mov al,21h
mov dx,01h
out dx,al ;ra lenh truyen
call delay
mov dx,01h
x3: in al,dx
and al,81h
cmp al,81h
jnz x3
mov dx,cx
mov al,m
mov dx ooh
out dx,al ;gui so byte can truyen
mov ah,al
x5: mov al,21h

out dx,al
call delay
mov dx,01h
x4: in al,dx
and al,81h
cmp al,81h
jnz x4
mov dx,bx ;tuyen du lieu can truyen
mov al,m
mov dx,00h
out dx,al
inc bx
dec ah
mov al,21h
mov dx,o1h
out dx,al
jnz x5
end

Chöông trình nhaän döõ lieäu.
;chuong trinh con delay
delay: push cx
mov cx,03h
y0: loop y0
pop cx
ret

;chuong trinh nhan du lieu
org 70000h
mov dx 01h ;dia chi thanh ghi dieu khien

mov al,00h
out dx,al ;xoa thanh ghi dieu khien
call delay

out dx,al
call delay

out dx,al
call delay

mov al,40h ; goi 40h vao al, gia tri cua bit RI de xoa thanh ghi noi
out dx,al
call delay
mov al,0cdh; ghi loi dieu khien che do vao thanh ghi dieu khien
out dx,al
call delay
mov al,26h ; ghi tu che do RTR(D1=1),RxEN(D0=1)
out dx,al
call delay
y1: in al,dx
and al,82h; kiem tra trang thai
cmp al,82h
jnz y1
mov dx,00h
in al,dx
mov bl,al; nap byte dia chi tap vao bl
mov dx,01h
y2: in al,dx
and al,82h
cmp al,82h

jnz y2
mov dx,00h
in al,dx
mov bh,al
mov dx,01h

y3: in al,dx
and al,82h
cmp al,82h
jnz y3
mov dx ooh
in dx,al ;nhan so byte truyen
mov ah,al

mov dx,01h ;nhan du lieu
y4: in al,dx
and al,82h
cmp al,82h
jnz y4

mov dx,00h
in al,dx
mov dx,bx
mov m,al
inc bx
jnz x4
end
II. CHÖÔNG TRÌNH TRUYEÀN DÖÕ LIEÄU TREÂN MAÙY TÍNH
; TERMINAL.ASM
; STACK

stack segment stack
db 300 dup('?')
stack ends
; DATA
data segment
prompt db 'File name:$'
filename db 30 dup(0)
buffer db 512 dup(0)
buffrr db 512 dup(0)
handle dw ?
openerr db 0dh,0ah,'OPEN ERROR - COPDE'
errcode db 30h,'$'

;messages
MENU_MS db ' **TERMINAL PROGRAM**',0dh,0ah
db '<F1> to redisplay this MENU',0dh,0ah
db '<F2> to set communications protocol',0dh,0ah
db '<F3> to display protocol installed',0dh,0ah
db '<F4> to open file.hex and trasnmit',0dh,0ah
db '<F9> to exit the TERMINAL program',0dh,0ah
db 'All character typed are transmitter',0dh,0ah
db 'All character receiver are display',0dh,0ah
db 0dh,0ah,'$'

PROT_MS db '* Installed communications protocol',0dh,0ah
db 'Baud rate:'
Baud% db '2400',0dh,0ah
db 'Parity:'
Par% db 'Even',0dh,0ah
db 'Stop bit:'

Stop% db '1',0dh,0ah
db 'Word length:'
Word% db '8',0dh,0ah,0ah,'$'

Baud$$ db '110 150 300 600 1200 2400 4800 9600'
Par$$ db 'odd noneven'

baud_menu db 0dh,0ah,'**New communication parameter'
db 'rs input **',0dh,0ah
db 'baud rate:',0dh,0ah
db '1 = 110',0dh,0ah
db '2 = 150',0dh,0ah
db '3 = 300',0dh,0ah
db '4 = 600',0dh,0ah
db '5 = 1200',0dh,0ah
db '6 = 2400',0dh,0ah
db '7 = 4800',0dh,0ah
db '8 = 9600',0dh,0ah
db 'Select: $'

par_menu db 0dh,0ah,'Pariry:',0dh,0ah
db '1 = odd',0dh,0ah
db '2 = none',0dh,0ah
db '3 = even',0dh,0ah
db 'Select: $'

Stop_menu db 0dh,0ah,'Stop bit:',0dh,0ah
db '1 = 1 stop bit',0dh,0ah
db '2 = 2 stop bit',0dh,0ah
db 'Select: $'

Word_menu db 0dh,0ah,'Word length:',0dh,0ah
db '1 = 7 bit',0dh,0ah
db '2 = 8 bit',0dh,0ah
db 'Select: $'

err1_ms db 0dh,0ah,'*** cannot transmit ***',0dh,0ah
card_base dw 02f8h ;address of RS 232 card
inT_num db 0ch
setup_byte db 0bbh ;
;Origin
O_int_seg dw 0000h ;segment
O_int_off dw 0000h ;offset

;circular buffer and pointer:
circ_buf db 20 dup(00h)
dw 0
data_in dw 0 ;input pointer
data_out dw 0 ;output pointer

data ends
;xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx CODE xxxxxxxxxxxxxxxxxx
code segment
assume CS:code
start:
mov ax,data
mov ds,ax
assume ds:data
mov es,ax
assume es:data

;display MENU at cursor
mov dx,offset menu_ms ;messages
call show_message
;hardware type
push ds
mov dx,0f000h
mov ds,dx
mov al,ds:[0fffeh] ;code to AL
;get addr of the RS232 card from BIOS data area
mov dx,0
mov ds,dx
mov cx,ds:0400h
pop ds
mov card_base,cx
;determine interrupt number:
; 0bh IRQ4 all other
cmp al,0fdh
jne set_address
mov int_num,0bh
;save/install interrupt
set_address:
mov ah,53
mov al,int_num
int 21h
mov o_int_seg,es
mov o_int_off,bx
mov ah,37
mov al,int_num
mov dx,offset cs:rs232_int
push ds