alarm house 16f877 ?

[seti75]

I program with winpic800 and icprog.
programming is normally ok at the end.
reading the 16F877 is also normally
with winpic800 and icprog.
when I delete the pic is also good.
reading indicates 3FFF ... ... so it's good 3FFF
but I do not understand why the pic does not work with any program! ?....

my 16f877 -----> Imageshack - 16f87720p

blueroomelectronics I can not find ? thank.
..... hex if possible i have difficulty
convert asm.to .hex

 

[Chippie]

blueroomelectronics I can not find ? thank.
..... hex if possible i have difficulty
convert asm.to .hex

Use Mpasm to generate the hex file from the assembly code...

You can download Mpasm from Microchip's website

 

[seti75]

I use MPLAB v8
I never managed to create a. hex from a file asm
Here is what I do and every time an error

project wizard --> next...16f877 --> next --> indic.location Mpaswin.exe ..---> next
creat name project file ..next --->add file asm..--> completed

after
....project open file project...---> make ------> error !!

 

[seti75]

16f877 --> he died ?

 

[be80be]

I use MPLAB v8
I never managed to create a. hex from a file asm
Here is what I do and every time an error

project wizard --> next...16f877 --> next --> indic.location Mpaswin.exe ..---> next
creat name project file ..next --->add file asm..--> completed

after
....project open file project...---> make ------> error !!
__________________
paris (france)

Hard to help you with this we have not any thing to go by
There a lot of things that can go wrong bigest is you tried to build on the desktop
and not a C:\ myfile\firsttry.asm

I have had a 16f877 stop working and all it was is the osc stoped working. I wouldn't throw it away
it's more likely something your doing.

 

[birdman0_o]

Pourquoi esce que vouz utilisiez un oscillateur externe?
Why are you using an external oscillator?

 

[be80be]

Pourquoi esce que vouz utilisiez un oscillateur externe?
Why are you using an external oscillator?

It's A 16f877 they have no internal oscillator

 

[seti75]

my lcd
https://www.selectronic.fr/upload/produit/fichetechnique/2337.pdf

a real say j' board many programs for 16F877 n'ais I never had a successful figure !
I do not know if this is the 16F877 or lcd that has a problem ?

how to say that c' is the 16f877 which has a prbléme or the lcd which has a problem?

thank

be80be ? --->

Imageshack - schematic

 

[be80be]

You building this on a solder less bread board right try two things first clip a gnd on the OSC to gnd see if that works If not remove c5 and c4 and see if that works

 

[Chippie]

Alors,

I have found my issue of EP numer 265.....Sadly that issue is no longer avaiable so I cant download the source code...

Suffice to say, I built a project from another issue called Meleda, based on 16F84 that refused to work...So I wouldnt rule out a s/w issue...

 

[be80be]

This is what get's me Op ask for help with this but no code has been posted and they said they tried it with a 16f84 and no go. If you look at the circuit for 16f84 it has a 4 mhz crystal so if you left the 20mhz on the board it wouldn't work the start up delays would be to fast for the lcd.**broken link removed**

 

[seti75]

c4 and c5 removed, that does not function.

the program of this alarm ----->

Free - Envoyez vos documents

is somebody has a simple program (leds) for tested this 16f877 and knowledge s' it is good?

I specify once again that several programs were tested with this 16f877 and no n' functioned!

 

[be80be]

I can't read that maybe if you want this fix you would take time to post it so we can help you. a hex is not much good if some thing goes wrong you need the code

 

[seti75]

One do not understand .

If you look at my post since the debut, kept silent will see that it is an assembly (editing) of electronique practice ( alarm ) with one 16f877 and a quartz of 20mhz.
My probléme it is to know if my 16f877 is good....?

 

[blueroomelectronics]

Try flashing an LED. I posted a link to a simple LED flasher for the 16F877.

 

[be80be]

Bill they want a hex that blinks. yes you put the thing together so you can call it

kept silent will see that it is an assembly (editing)

Still need the source code not a hex I can build them and write them
It's hard to help you because we can't see what your doing and your writing is worst then mine

 

[seti75]

my lcd is good with the program of this page

**broken link removed**

test my lcd -->
Imageshack - hellw

it is necessary that I find the same program test for a 16f877. to know if the 16f877 really died

 

[Chippie]

it is necessary that I find the same program test for a 16f877. to know if the 16f877 really died

Do what Blueroom electronics suggested...flash an led....You can write the code so that you could test each pin individually or sequentially...

;*** WDT reset toggles RB0
list p=16F877A
include <p16F877A.inc>
__CONFIG 0x3F7D
org 0
bsf STATUS, RP0
movlw b'00001110'
movwf OPTION_REG
bcf TRISB, 0
bcf STATUS, RP0
movlw 1
xorwf PORTB, f
sleep
end

BRE, Hope you dont mind me posting the code...

 

[seti75]

I do not include/understand ? with which diagram ? (schématic)

thank

 

[Chippie]

Follow the link....schema is at the bottom of the page...