trouble using GLCD of type ks0108 controller

[doritos]

hi everyone,

recently I have been trying to work with GLCD of type ks0108 controller. I downloaded openGLCD library from https://bitbucket.org/bperrybap/openglcd/downloads
I made a circuit in proteusv8.4 which includes following hardware:
1. Arduino uno
2. AMPIRE 128x64 GLCD
3. resistor pack for input pullup
4. potentiometer 10K

I wired the circuit as shown in figure 1.

then I made a following simple program to display a letter 'h':


#include <openGLCD.h>

void setup()
{
  GLCD.Init();
  GLCD.SelectFont(System5x7);
  GLCD.ClearScreen();
  GLCD.print("h");
} 

void loop()
{
 
}

problem:
I am not getting intended output, even after successful compilation of program, rather I'm getting output as shown in figure 2.
I would be very grateful if someone help me out with this.

[bperrybap]

Run the diag sketch.
That should be the first thing you run when trying to bring up any new hardware.
--- bill

[doritos]

thank you bperrybap for your reply.

I tried to simulate diag sketch but it didn't work. but surprisingly when I changed the clock frequency of GLCD to1200 KHz (previously 300 KHz) everything worked fine.
since I was just simulating this circuit in proteus and was not physically making it so can you please explain the phenomenon of changing frequency worked in simulation? if I would have made a physical circuit so what would be the remedy if same problem is encountered physically?

[bperrybap]

I have no clue how proteus does its simulation.
Simulators are not reality.
When it comes to working with h/w I believe in working with, well.. real h/w.

--- bill

[doritos]

thank you  sir for your reply