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Pic16f628 hyperterminal connection

Sun, 16 Mar 2008 11:10:35 -0700

Hi. I want to send some characters to pc.
I set baud rate 9600 in the pic.Then connect tx pin to serials rx. but in hyperterminal doesnt appear anything.
Then i set baud 2400 in my pic program. and opened hyperterminal . got some character but wrong chrachter .i sent 1 but get gç
i also used max232 but nothing changed.
please help. what is wrong?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Wed, 19 Mar 2008 11:49:30 -0700

please take a look at tutorial.. you will get a better idea..
http://www.8051projects.net/lcd-interfacing/

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 17 Mar 2008 01:22:44 -0700

I recommend u to first check ur PC's serial port by shorting pin2 & 3 and send some characters via Hyper terminal. make sure u enabled the echo type character locally in settings->ASCII setup.
One more thing ground ur rx232 port's 5th pin with ur PC's 5th pin.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 17 Mar 2008 10:57:54 -0700

keep flow control none.

well if its working then you must see whatever you are typing.

try 115200 baud.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 17 Mar 2008 07:05:28 -0700

i tried. shorted 2&3. pins. then set baud rate 9600 and flow control hardware but when i send something nothing arrived.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 17 Mar 2008 07:37:05 -0700

ok means u checkd ur PC serial port...and since nothing is arrived in hyper terminal it means that there is some problem in ur PCs serial port...
did u select the correct COM port in PC???? to check that go to device manager-> Ports where u check the which port is assigned for serial port. And in hyper terminal select that port only and sort pin 2&3 of PC serial port and check again.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 17 Mar 2008 07:38:56 -0700

ok. which baud rate must i use? and flow control must be hardware or none?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 05:12:53 -0700

i tried if i press a key then comes the same one (without pressing enter)
so com port works.
now what is the problem?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 08:35:33 -0700

i also used max232 but nothing changed.

You mean you even connected the PIC and PC without MAX232?
If so then your PIC's serial port may be busted.Try using a different PIC and also show us your code.
And remember never hook up the mcu's and PC's serial ports without a level converter.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 08:43:43 -0700

but i only used pic's tx pin. so i can connect directly.if i use rx so i must use max232.
i connected pic's tx to serial 's rx and gnd to (-)
my program:

#include <16F628.h>
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_b1, rcv=PIN_b2)
void main(){
for (;;){
putc('1');

}

}

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 22:08:24 -0700

r u using CCS PCM compiler?? the cod eseems that way...
while burning to the chip did u check the correct configuration... ??
i mean oscillator type and WD..

your problem can be due to enabled watch dog or wrong choice of oscillator...

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 11:20:17 -0700

hey what is wrong?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 12:35:22 -0700

your connections are not seem to be fine..

plz post your circuit cannot understand what are you saying..
and yes you need max232 for connecting PIC to PC.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 12:50:42 -0700

circuit in attach.
i did as circuit. but with my code (i gave it) it doesnt work.
sometimes some character comes. but characters > $%&
i want to send only "1".

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 13:08:28 -0700

what is crystal frequency you are using? and baud?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Tue, 18 Mar 2008 13:11:42 -0700

i selected intrc. 4 mhz and my c program too. and i tried 9600. but nothing happened. then i select 2400 only hyperterminal. some different characters came.
i used for loop. so it must come every loop. but that characters comes sometimes.and isnt "1"

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Wed, 19 Mar 2008 11:02:13 -0700

my connection is same in the picture. shyam and ajay please help. it doesnt work. only 16 box appear what is problem. how can i set 4 bit mode ajay?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Wed, 19 Mar 2008 06:06:19 -0700

i selected intrc clkout. wihch setting i must enable?
wdt,mclr, etc.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Wed, 19 Mar 2008 07:05:28 -0700

and i connected lcd.but in lcd screen (2x16) there are 16 small box. the program and connection true.my program:

CODE:

#if defined(__PCM__)
#include <16F628.h>
#use delay(clock=4000000)
#define use_portb_lcd TRUE //lcd bilgisi için port b'yi kullanıyoruz
#include 
int tamsayi=1; // tamsayi adında tamsayı tipinde bir değişken tanımlıyoruz ve değerini 1 olarak başlangıçta veriyoruz.
void main()
{
   lcd_init(); //lcd ekranımızı kuruyoruz
   printf(lcd_putc,”Cevizimiz:\n%d”,tamsayi); //Ekrana “Cevizimiz:” yazar ve alt satıra giderek sonuc değişkenini yazar.
   bas:
   goto bas;
}

but didnt work. i select intrc clkout. what is problem?
i cant connect to pc and cant working with lcd

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Wed, 19 Mar 2008 09:54:20 -0700

you are using LCD in 4-bit mode.. and you did not specify it anywhere...

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Wed, 19 Mar 2008 10:20:19 -0700

hey are using an lcd library or have u made that lcd_init() by ur own??
if u made it feel free to share with us we will not misuse it

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Thu, 20 Mar 2008 13:13:13 -0700

looks like LCD is faulty.. first portion of pixels are not glowing properly...

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Thu, 20 Mar 2008 01:47:56 -0700

CODE:

#if defined(__PCM__)
#include <16F628.h>
#use delay(clock=4000000)
#fuses INTRC_IO,NOWDT,NOPROTECT,NOLVP,NOBROWNOUT
#define use_portb_lcd TRUE
#include 
void main()
{
   lcd_init();//ekranımızı kuruyoruz
   lcd_gotoxy(1,1);
   lcd_send_byte(1,65);
   for(;;)
   {}
}
 

this is my code.Connection is above..It must display "A" but lcd display :

what is the problem?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Thu, 20 Mar 2008 13:18:36 -0700

hey but it is new. i bought it 2 days ago and cant worked it.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Thu, 20 Mar 2008 21:17:48 -0700

this is so confusing!!
may i see your LCD routines?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Fri, 21 Mar 2008 05:50:36 -0700

it is JHD 162A model.
What is lcd routines?

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Fri, 21 Mar 2008 11:12:13 -0700

I mean your LCD program.. where have you written your LCD program..

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Fri, 21 Mar 2008 14:45:42 -0700

where is the code? for LCD.. i mean i want to see that lcd.c file!!!!

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Fri, 21 Mar 2008 13:24:43 -0700

in ccs c

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Sat, 22 Mar 2008 14:52:12 -0700

install ccs c it is ccs c library.
look google. every lcd project in ccs includes lcd.c
i dont know its content

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 24 Mar 2008 13:04:14 -0700

lcd.c uses 4 bit mode. but i think my lcd not working. because i download a hex file but didnt work.
i 'll connect pic and pc.i havent done this yet

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 24 Mar 2008 13:00:26 -0700

ok.. so how you define whether you are using LCD in 8-bit or 4-bit mode? there must be something where you tell your compiler which library to use for your LCD depending on mode of usage.. I think you need to find out how to do that.. or try if you can take a look at content of lcd.c it must be located somewhere in the include directory.

Re: Pic16f628 hyperterminal connection

contact@nospam.com (Ajay Bhargav) — Mon, 24 Mar 2008 13:27:15 -0700

well as i looked from the pic you send of LCD it seems LCD is burnt.. still cant be sure of that but chances are there.. reason could be any..
even a simple electrostatic discharge from human body can damage it