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Hello everyone, I am working with the lpc2148 board and I am trying to interface it to a graphic LCD WG320240C0. The code I am trying it is not working. I have checked the control and data bus connections and it seems ok. I believe is that it is not working because of voltage level issues. The ARM works with 3.3V and the screen does it with 5V. Could this be as i say? How can I solve the problem? i have already tried with pull-ups but it didnt chage. I also have doubts on how to connect the backlight and the LCD driving voltage. I dont want to blow anything... Which are the correct input voltage for each? thanks for the time
So nothing to do with Keil, then?!
" The ARM works with 3.3V and the screen does it with 5V. Could this be as i say?"
The Datasheets will tell you that!
"How can I solve the problem?"
Study the Datasheets, and visit the manufacturer's website - there is certain to be some documentation (eg, Application Notes) about 5V-to-3V3 interworking.
If all else fails, companies such as TI, National, et al make voltage level translators.
"I also have doubts on how to connect the backlight"
Again, see the Datasheet.
"I dont want to blow anything..."
That's why it is essential that you study the Datasheet before connecting anyhing!
"Which are the correct input voltage for each?"
Datasheet!
I think Andy's response may not be clear enough for you. There are some clues hidden in what he wrote, but you might find them difficult to spot.
In a nutshell he is saying: Read the Datasheets.
I have the datasheets. I have seen them. Your answer doesnt help. Next time just ignore the thread.
I have seen them
But have you read them ?!
Yes I did. May be I have lack of interpretation. And that is why i am looking for some guidance.
That's possible.
But, if you want people to interpret the documents for you, then you will need to provide links to the specific documents that you have in order that we know what to interpret!
Alternatively, speak to the manufacturers of these parts, and/or their distributors - they have technical support staff whose job it is to help customers to use their products!
Ok, thanks