Help about 128x64 lcd

Robin · Joined: 23 Feb 2015 Posts: 2

Hello everyone!

firstly, I would like excuse me for my English. I am French and I have a lot of trouble to write english.

I come to ask for help.

Indeed, after many tests I can't use my LCD

My setup:
PIC18F4550-20MHz Crystal-PICkit2

The lcd:
12864A
EMG12864A-FL-YBS

I just found this little datasheet for lcd: http://www.sharp-electronic.com/downfiles/20131010231332.pdf

Someone would have there an example and library of a program that works?

I already tested glcd, KS0108, Extended_GLCD Drivers , none works for me.

In advance thank you !!!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

temtronic · Posted: Mon Feb 23, 2015 12:46 pm

Basic questions
1) have you got your PIC to run a '1Hz LED' program successfully?

If not, choose an unused pin and make a simple program to flash the LED at a 1Hz rate. That PIC has a lot of 'clock' options, so we have to know it does this test.

2) there are about 75 'hits' when you search 'KS0108' on this forum, so you're not the first to use that GLCD. You may have to open/read everyone to see.

3) wiring ? use a 3rd party 'hosting service' and show us your schematic.

4) disable any/all peripherals that are common to the I/O pins the GLCD is attached to.

5) compile in 'release' mode NOT 'debug'.

6) show us your code/compiler version/fuses. it could be something simple...

7) contrast ! how have you wired it up ??

the more info you supply the better we can help.

jay

Robin · Joined: 23 Feb 2015 Posts: 2

Yes exactly : EGM12864A Sorry :(

HDM64GS12 : I try tomorrow

1 ) Yes , timer, pwm and rs232 work fine and i make a new project for testing the LCD

2) I read a lot of post but my lcd doesn't work

3) wiring ? ohh ... i make a pcb for test 18f4550 but without LCD pinout. so i put some cable directly to the lcd..

4)Yes, i try

5) Ok I try tomorrow

6)
#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,USBDIV,PLL5,CPUDIV1
#use delay(clock=48000000)

I try a lot of configuration

7) first : Gnd^^^^^VDD
...................... |
...................... |_pin3

. 2° : the same with pin 18 VEE

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

This diagram shows the contrast circuit that you should be using:
http://embedded-lab.com/blog/wp-content/uploads/2011/12/GLCD_InternalBlock1.jpg
Note the trimpot's output (center wiper pin) goes to Vo. The two ends of
the trimpot connect to Vdd and to Vee.

Also the same circuit is shown on page 8 of this KS0108 glcd:
https://www.crystalfontz.com/products/document/100/CFAG12864KYYHTN.pdf