LCD Display - Electronic Circuits Projects Diagrams Free

joshua17ss2 · 9th May 2008, 02:42 PM

I was attempting to connect up my very first lcd last night, i got the connected to the board, and loaded the code, and all the lcd show are 2 lines of solid blocks, i checked the code over and i cant seem to find the problem. I attached the code, is there something in it that im missing,
its coded in swordfish se
The led i have on the board is blinking so i know the processor is doing something.

thanks josh

futz · 9th May 2008, 02:53 PM

Well, I don't know that BASIC or how its libraries work, but two lines of solid blocks says to me that the LCD hasn't been initialized. 44780 LCD's do that when the power is turned on but they haven't been initialized.

Look for an LCD init command of some kind.

arhi · 9th May 2008, 02:57 PM

two lines of solid blocks can also mean that contrast is not setupped properly.

futz · 9th May 2008, 02:59 PM

Quote:

Originally Posted by arhi

two lines of solid blocks can also mean that contrast is not setupped properly.

That too!

joshua17ss2 · 9th May 2008, 03:03 PM

i adjusted the contrast to that the line went away, im running the contrast pin thougth a 10 k pot as its all i have, this part seems to be working ok.

I was looking at my code agian, could the pic be geing stuck in my first while loop, and just ignoring the rest of the code?

I was loosely following the tutorial for spency's pic basic, the code was basically the same, i adjusted the clock, and option statements to meet my pin out and pic

arhi · 9th May 2008, 03:28 PM

you can compile the code for 16F and run the hex trough http://www.oshonsoft.com/ pic simulator (it simulates the LCD also) ..

as from the source code ..

Code:

...
While True


    LED = 1                         // Turn on the LED


    DelayMS(500)                    // Delay for half a second


    LED = 0                         // Turn off the LED


    DelayMS(500)                    // Delay for half a second


Wend
...

this loop will run forever, you never exit it .. you might use some for loop to do the blink some number of times, or some counter inside the loop then break the loop or goto from it ..

so in short, as your code is written, the DelayMS(150) will never be reached.

joshua17ss2 · 9th May 2008, 03:46 PM

so if i were to just completely remove the led code it should run thought the lcd code and initialize and display the data

arhi · 9th May 2008, 04:00 PM

Quote:

Originally Posted by joshua17ss2

so if i were to just completely remove the led code it should run thought the lcd code and initialize and display the data

It should. Lcd libraries often ask for some LcdInit() before you start using the lcd, but i'm not familiar with compiler you are using, so you will have to try.

ericgibbs · 10th May 2008, 11:41 AM

Quote:

Originally Posted by joshua17ss2

I was attempting to connect up my very first lcd last night, i got the connected to the board, and loaded the code, and all the lcd show are 2 lines of solid blocks, i checked the code over and i cant seem to find the problem. I attached the code, is there something in it that im missing,
its coded in swordfish se
The led i have on the board is blinking so i know the processor is doing something.

thanks josh

hi,
Look at this forum link:

http://www.electro-tech-online.com/m...nds-reset.html

aljamri · 10th May 2008, 04:43 PM

Quote:

Originally Posted by joshua17ss2

I was attempting to connect up my very first lcd last night, i got the connected to the board, and loaded the code, and all the lcd show are 2 lines of solid blocks,

Your luck much better than mine. My first LCD did not show even the backligh effect.

software problem is likely to be solved here or there.

Good Luck

joshua17ss2 · 11th May 2008, 05:45 PM

with some slight tinkering to the wiring and the removal of the led flashing code, i got the data being displayed, just in case i ran out and bought a new pot to adjust my contrast
and everything is working perfectly now.

now i need to figure out how to have the chip multi tasking while displaying my infromation

thanks for the help

Haas · 12th May 2008, 11:10 AM

try the LCD CS timing

Gordz · 12th May 2008, 12:44 PM

Real time interupts are good for multi-tasking. Remember that there are certain timing requirements that need to be met when sending commands to the LCD module. There is a huge amount of info on this on the 'net.

9th May 2008, 02:53 PM	#2 (permalink)
futz Experienced Member Join Date: Sep 2007 Location: Vancouver, B.C. Posts: 903	Well, I don't know that BASIC or how its libraries work, but two lines of solid blocks says to me that the LCD hasn't been initialized. 44780 LCD's do that when the power is turned on but they haven't been initialized. Look for an LCD init command of some kind. __________________ ========================= Futz's Microcontrollers & Robotics =========================

9th May 2008, 02:57 PM	#3 (permalink)
arhi Experienced Member Join Date: Apr 2008 Location: Belgrade Posts: 106	two lines of solid blocks can also mean that contrast is not setupped properly. __________________ http://www.it4um.com

9th May 2008, 03:03 PM	#5 (permalink)
joshua17ss2 Experienced Member Join Date: Mar 2008 Posts: 55	i adjusted the contrast to that the line went away, im running the contrast pin thougth a 10 k pot as its all i have, this part seems to be working ok. I was looking at my code agian, could the pic be geing stuck in my first while loop, and just ignoring the rest of the code? I was loosely following the tutorial for spency's pic basic, the code was basically the same, i adjusted the clock, and option statements to meet my pin out and pic Last edited by joshua17ss2; 9th May 2008 at 03:06 PM.

9th May 2008, 03:28 PM	#6 (permalink)
arhi Experienced Member Join Date: Apr 2008 Location: Belgrade Posts: 106	you can compile the code for 16F and run the hex trough http://www.oshonsoft.com/ pic simulator (it simulates the LCD also) .. as from the source code .. Code: ... While True LED = 1 // Turn on the LED DelayMS(500) // Delay for half a second LED = 0 // Turn off the LED DelayMS(500) // Delay for half a second Wend ... this loop will run forever, you never exit it .. you might use some for loop to do the blink some number of times, or some counter inside the loop then break the loop or goto from it .. so in short, as your code is written, the DelayMS(150) will never be reached. __________________ http://www.it4um.com

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9th May 2008, 03:46 PM	#7 (permalink)
joshua17ss2 Experienced Member Join Date: Mar 2008 Posts: 55	so if i were to just completely remove the led code it should run thought the lcd code and initialize and display the data

11th May 2008, 05:45 PM	#11 (permalink)
joshua17ss2 Experienced Member Join Date: Mar 2008 Posts: 55	with some slight tinkering to the wiring and the removal of the led flashing code, i got the data being displayed, just in case i ran out and bought a new pot to adjust my contrast and everything is working perfectly now. now i need to figure out how to have the chip multi tasking while displaying my infromation thanks for the help

12th May 2008, 11:10 AM	#12 (permalink)
Haas New Member Join Date: May 2008 Posts: 4	try the LCD CS timing

12th May 2008, 12:44 PM	#13 (permalink)
Gordz Experienced Member Join Date: Oct 2007 Location: Sydney - Australia Posts: 157	Real time interupts are good for multi-tasking. Remember that there are certain timing requirements that need to be met when sending commands to the LCD module. There is a huge amount of info on this on the 'net.

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