serial communication code,whats wrong in this? - Electronic Circuits Projects Diagrams Free

baftab · 19th December 2007, 09:49 AM

org 000h

mov A,pcon
setb acc.7
mov pcon,A
mov tmod,#20h
mov th1,#-3
mov scon,#50h
setb tr1

mov DPTR,#rfid

h_1: clr a
movc A,@a+dptr
jz b_z
acall send
inc dptr
sjmp h_1
b_z:lcall b_1
send:mov sbuf,A
h_2:jnb ti, h_2
clr ti
ret

org 0300h
rfid: DB "re364 acknwlge",0
b_1:
end

i am checking its output on hyperterminal, and its sending me the data continously

what am i doing wrong here??
i just want it to send me "re364 acknwlge" once

futz · 19th December 2007, 04:02 PM

Please use Code tags when posting code. Simply click on the # in the menu above the text entry box before pasting your code. Makes it look like this:

Code:

	org	000h

	mov	A,pcon
	setb	acc.7
	mov	pcon,A
	mov	tmod,#20h
	mov	th1,#-3
	mov	scon,#50h
	setb	tr1

	mov	DPTR,#rfid

h_1:	clr	a
	movc	A,@a+dptr
	jz	b_z
	acall	send
	inc	dptr
	sjmp	h_1
b_z:	lcall	b_1
send:	mov	sbuf,A
h_2:	jnb	ti, h_2
	clr	ti
	ret

	org	0300h
rfid:	DB	"re364 acknwlge",0
b_1:
	end

felis · 19th December 2007, 08:19 PM

Which micro this is written for? It looks like 8051 but I'm not sure.

baftab · 19th December 2007, 10:23 PM

yeh at89c51

Brevor · 20th December 2007, 01:02 AM

You LCALL to b_1 but you have no code there. The processor doesn't just stop at the end statement, you need a loop there because the program counter will continue to run.

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19th December 2007, 09:49 AM	(permalink)
baftab	serial communication code,whats wrong in this? org 000h mov A,pcon setb acc.7 mov pcon,A mov tmod,#20h mov th1,#-3 mov scon,#50h setb tr1 mov DPTR,#rfid h_1: clr a movc A,@a+dptr jz b_z acall send inc dptr sjmp h_1 b_z:lcall b_1 send:mov sbuf,A h_2:jnb ti, h_2 clr ti ret org 0300h rfid: DB "re364 acknwlge",0 b_1: end i am checking its output on hyperterminal, and its sending me the data continously what am i doing wrong here?? i just want it to send me "re364 acknwlge" once

19th December 2007, 04:02 PM	(permalink)
futz	Please use Code tags when posting code. Simply click on the # in the menu above the text entry box before pasting your code. Makes it look like this: Code: org 000h mov A,pcon setb acc.7 mov pcon,A mov tmod,#20h mov th1,#-3 mov scon,#50h setb tr1 mov DPTR,#rfid h_1: clr a movc A,@a+dptr jz b_z acall send inc dptr sjmp h_1 b_z: lcall b_1 send: mov sbuf,A h_2: jnb ti, h_2 clr ti ret org 0300h rfid: DB "re364 acknwlge",0 b_1: end __________________ ========================= Futz's Microcontrollers & Robotics =========================

19th December 2007, 08:19 PM	(permalink)
felis	Which micro this is written for? It looks like 8051 but I'm not sure.

19th December 2007, 10:23 PM	(permalink)
baftab	yeh at89c51

20th December 2007, 01:02 AM	(permalink)
Brevor	You LCALL to b_1 but you have no code there. The processor doesn't just stop at the end statement, you need a loop there because the program counter will continue to run.