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Suge:

What exactly is the problem you have ? What kind results do you have now ?

I'm not really familiar with VB or PictureBox but this was the question that came up when reading your post as "it doesn't work" just isn't very descriptive.

Well, I'm just getting no result. Using the function mentioned earlier isn't giving any result on the LCD.

This is wat I get when I'm trying to get to color of a specified location (x, y) in a picturebox:



I think that the result isn't write.... someone who can help me with getting the correct results?

n/m

n/m

helo all

i want solution for pic microcontroller ,my problem is i want to connect LCD display for the same can any body help me

Please have a look into the other topics in this forum and there should be examples for PIC too.

Can some one post some working code like a zip with the basic frm`s en other needed files.

Hi,

I found this discussion very interesting but I have something to ask to the user Henri that posted his code (page 1 of this thread) to manage a T6963C with "Powerlcd" wiring: (this is a piece of his code concerning the routine WaitDisplayReady)

int Tmp;

Tmp = DlPortReadPortUshort(BASE + 0x402);
Tmp = Tmp & 0x1F;
Tmp = Tmp | 0x20;
DlPortWritePortUshort(BASE + 0x402, Tmp);

Why do you read and then write at the address BASE+0x402? Is this because the parallel port is set to EPP?

Thank you, regards.

Bob

That is an interesting question. It has been a while since I have had a closer look into the LPT registers but yes you should be correct that it's accessing the additional registers of the other LPT modes. (EPP probably?)
If you check from the specs how the EPP mode for example works should most likely explain why this is done this way.

Thanks for the answer.
Well...I translated your code (page 1) into Delphi since I have a DMF-5002 with T6963C onboard to see if I'm able to make it working (I'm trying to replicate an autopilot module for the flight simulation).
The wiring I used is the Powerlcd so it should work (I hope eheh).

Regards,

Bob

It seems it doesn't work
The LPT is set to EPP and the wiring scheme I adopted is the following:

LPT pin T6963

17 ----> RD
16 ----> C/D
14 ----> CE
1 ----> WR

2 to 9 --> D0 to D7

According to the OPTREX DMF-5002 user manual to read the status of the T6963C I should set: (I report exactly as it written on the manual)

RD="L", C/D="H": Status Read, C/D="L": Data Read

it's not clear when I must set the C/D=L, prior to read the D0-D7 or after.
Anyway in my program I tried this (sorry it's Delphi but I think is understandable)

portwriteb($378,0) // set the data lines to 0 to avoid dirty data

portwriteb($378+2, $04) // RD=0, C/D=1
tmp:= portreadb($378) // read D0-D7
portwriteb($378+2, $00) // RD=0, C/D=0

in this case the status (tmp) value is 0.
If I modify the code as follows:

portwriteb($378,0) // set the data lines to 0 to avoid dirty data

portwriteb($378+2, $04) // RD=0, C/D=1
portwriteb($378+2, $00) // RD=0, C/D=0
tmp:= portreadb($378) // read D0-D7

the result is the same: tmp=0

I found another document about T6963C programming reporting this:

Status Read: C/D=1, R/D=0, W/R=1, CE=0
after 150 ns read the data D0-D7 then CE=1

I modified the code as follows then:

portwriteb($378,0);

portwriteb($378+2, $05); // RD=0, C/D=1, CE=0, WR=1
tmp:= portreadb($378);
portwriteb($378+2, $07); // RD=0, C/D=1, CE=1, WR=1

the status (tmp) also in this case is 0.
At this point I'm confused and I don't know what is the correct way to read the status.
If it was all correct, it sounds strange to me that the status is always 0.
I see there is a pin on the T6963C named /HALT (active low, stop the oscillation clock) that I connected to +5V...is that correct?

Someone can help to clarify things?

Thanks, regards.

Bob

I found the problem...it's not in my code but in the wiring...even though the wiring is correct, for some reason the data line of the LPT port can't be read...I found it because I touched the T6963C and it was hot, so I tried to disconnect only the data lines and with my multimeter I have read the status register directly from the pins of the T6963C reading the STA0 and STA1 bit (both at 1).

Regards,

Bob