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[SOLVED] 20x4 LCD interfacing with LPC2368

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shashank07

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hello Friends

I am working on 20x4 lcd interfacing with LPC2368.

I already work on 16x2 lcd.

Is both display initialization same?

how to write data on different line

I mean what is line address?

does any one have experience on 20x4
 

Yep, the initialization is same as 16X2 LCD, the third line is the continuation of first line and fourth line that of second line.

first line address : 00h to 13h
second line address : 40h to 53h
third line : 14h to 27h
fourth line : 54h to 67h
 
Hi Ud thanks for reply
so if i want to write data on 2nd line i'll give 40 as a command
and cursor will automatically come to 2nd line right?
 

Yes, the cursor will be on the first position
 

that's nice
I have done with almost everything in coding part
but stuck at one point
my data pins are not at single port D0-D3are at port0 and D7-D4 are at port 1
now if i want to display a single character what should I do for example 'A'
 

shashank07 said:
that's nice
I have done with almost everything in coding part
but stuck at one point
my data pins are not at single port D0-D3are at port0 and D7-D4 are at port 1
now if i want to display a single character what should I do for example 'A'
Click to expand...

Why dont you try it in 4bit mode..
 

Hi nandu
to test code I am using 16x2 lcd on LPC2148 as I have that board available
I made according changes for that.
I check that code on debugger its working as per requirement
BUT when I test it on board I found one problem
LCD enable PIN is not getting HI at the time of command

also i check data pins of LCD with oscilloscope I am getting 0x38 which is first command
but enable pin is still low
Any solution?
 

shashank07 said:
Hi nandu
to test code I am using 16x2 lcd on LPC2148 as I have that board available
I made according changes for that.
I check that code on debugger its working as per requirement
BUT when I test it on board I found one problem
LCD enable PIN is not getting HI at the time of command

also i check data pins of LCD with oscilloscope I am getting 0x38 which is first command
but enable pin is still low
Any solution?
Click to expand...

I cant find out the fault unless i see the code.
 

give me your mail id so that i can mail you
 

Hello friends
My code is running problem was the contrast settings
So i change POT settings and its working :)
 

ud23 said:
Yep, the initialization is same as 16X2 LCD, the third line is the continuation of first line and fourth line that of second line.

first line address : 00h to 13h
second line address : 40h to 53h
third line : 14h to 27h
fourth line : 54h to 67h
Click to expand...

do you mean
lcd_cmd(0x14); and lcd_string("something") ?

it doesn't work...
 

Set the parameter's 7th bit to 1.
Use this:
lcd_cmd(0x80 + rowaddress + colnum);
eg
lcd_cmd(0x94); //0x80 + 0x14 + 0: third line, pos 0
 

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