(newbie)JDM & Ic prog problem.

[MathGeek]

I use

IC prog
JDM (COM port DB9)
Win XP
16F628

Mine just doesn't work. I get error messages like "Verify failed at 0000h" or if I tried to blank check, I get "the device NOT blank at 0000h"

I did some research, and can voltage (MCLR and Vdd) be a problem?

I heard that MCLR should be over 13v, but what about Vdd?

Also, if the voltage is the problem, what should I do? I really don't have the money/time to buy or build another programmer.

Thanks.

PS. If I use Internal Osc., I don't have to have an external crystal, right?

 

[upand_at_them]

Is it a laptop? Are you programming in-circuit or using the socket?

Mike

 

[Jay.slovak]

PS. If I use Internal Osc., I don't have to have an external crystal, right?

You don't need any oscilator for programing. But for run-time Internal Oscilator is always sufficient.

We need answers for above questions to help you more....

 

[MathGeek]

Just a plain desktop (motherboard NF7-S manufactured by Abit)

Just a regular, in-socket programming. No advanced in circuit programming.

 

[Nigel Goodwin]

The JDM programmer is well known for problems, as it relies on the serial port exceeding the RS232 specification - it's probably the most troublesome PIC programmer there is?.

It's a VERY clever piece of design, and it's quite difficult to understand how it works - but it seems to have been designed JUST to be clever, and not to be practical?.

 

[Jay.slovak]

The JDM programmer is well known for problems, as it relies on the serial port exceeding the RS232 specification - it's probably the most troublesome PIC programmer there is?.

Well, teoreticaly it is troublesome, but it serves well to many people (including me), and some probelms are always expected with such a simple solution (Powered directly from COM port).

It's a VERY clever piece of design, and it's quite difficult to understand how it works - but it seems to have been designed JUST to be clever.

Yep, JDM is very interesting design, it took me a while to understand...

But, it's always better to "play" with Serial port (especially for beginners) then with Paralel port, try to short both and you will understand why.

BTW: My first ever builded programmer was paralel and it never worked :lol:

 

[MathGeek]

Ah........


So what should I do besides lamenting the troublesomeness of JDM?

Edit: here is the schematic.

 

[Jay.slovak]

Ah........


So what should I do besides lamenting the troublesomeness of JDM?

Did you instal Ic-progs device driver? You need it if you are running XP.

 

[MathGeek]

Ah........


So what should I do besides lamenting the troublesomeness of JDM?

Did you instal Ic-progs device driver? You need it if you are running XP.

Yup. I did.

EDIT: Also, I use 6ft cable...does that make difference?

 

[Jay.slovak]

That shouldn't be a problem, did you try Ic-prog's Hardware Check feature?

 

[GatorGuy]

I started with the same problem. In your settings are you using Direct I/O or Windows API? I have found tutorials using the direct I/O but I could only get it working with API.

Also Try different fuse settings. Sometimes when I set certain ones it won’t program at all.

 

[MathGeek]

I tried both direct I/O and windows API (what does that stand for anyway?). No avail.

IC-Prog's hardware check thing...I tried to work with it, but since I am new, I really don't know how to utilize it.

I think in hardware check, when I click "Enable MCLR," the voltage of MCLR is supposed to go up (???).

Can someone help me with this?

I seriously think there is something wrong with hardware. But I made sure many times that I built correctly using the schematic.

Please.....I am all frustrated...but still have hope

 

[MathGeek]

A weird thing happened.


After much thinking, I concluded that there is nothing wrong with the software or hardware itself. It is the communication that is causing the problem.

As I said before, i connected JDM to my COM2, and set IC prog to COM2.

I thought, maybe there is something wrong with my COM2.

So I switched the cable to COM1, BUT I forgot to change the hardware setting accordingly. So, ICprog setting is still COM2.

I tried to program like this, and it said "Device Verified!"

Wow, what just happened?

 

[MathGeek]

The most recent update:


Yes, it works!

Thanks for all your help.



I still can't believe it works......

 

[GatorGuy]

Glad it works. I had to same problems when I got my JDM programmer. I haven’t tested why it won’t work on com2 but I did that same thing. Even with the settings on com2 it wouldn’t program.

I might be wrong(correct me if I am) but if you enable MCLR doesn’t that allow you to use it as the master clear? It shouldn’t effect the voltage at all.

 

[Exo]

I tried both direct I/O and windows API (what does that stand for anyway?).

Windows application programmer's interface.
Direct IO bit bangs the IO directly, wich only works in win95/98/me...
or with special drivers on other windows'es...
when using the api, the program calls functions and services provided by windows.