Problem with GRAPHICS LCD Interface (128*64) for cyclone 3c120 device

Hi all,

I'm a novice programmer to interface graphics LCD (glcd) using cyclone iii 3c120 device.

The display is an Optrex part number F-51852GNFQJ-LB-CAN (Green Pixels).

128 × 64 dot matrix graphics LCD display.

I'm using Nios II Eclipse IDE to interface glcd with a C language based API.

The C source file is shown below(taken from 24931 post id):

# include<stdio.h># include <unistd.h># include "system.h"# include "altera_avalon_pio_regs.h"

void glcd_writeByte(int DI, int data)

{

if (DI == 1)

{

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_D_CN_BASE, 0x01); //write a command;

}

else

{

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_D_CN_BASE, 0x00); //write data;

}

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_DATA_BASE, data); //put DATA on the data lines;

usleep(2); //wait 2 us

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_WEN_BASE, 0x00); //pull the Write Enable pin low to enable writing to the LCD

usleep(2); //wait 2 us

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_WEN_BASE, 0x01); //pull the ENABLE pin high to disable writing to the LCD

}

void glcd_init(void)

{

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_WEN_BASE, 0x01);

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_D_CN_BASE, 0x01);

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_RSTN_BASE, 0x00); // Hard reset

usleep(20); // Wait 20us;

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_RSTN_BASE, 0x01); // Release reset;

usleep(100000); // Wait 100ms);

glcd_writeByte(0, 0xe2); // Internal Reset

glcd_writeByte(0, 0xa2); // Bias = 1/9; 0xa3 for 1/7

glcd_writeByte(0, 0xa1); // ADC = 1 (right to left); 0xa0 for 0(left to right)

glcd_writeByte(0, 0xc0); // Common direction = Normal; 0xc1 for inverse

glcd_writeByte(0, 0x28); // Set Power Control - Internal power circuits OFF ******* but looks better with 0x2f

glcd_writeByte(0, 0xe7); // Set Driver ON; 0xe6 for OFF

glcd_writeByte(0, 0xaf); // Display ON; 0xae for OFF

glcd_writeByte(0, 0xa5); // Entire Display ON - Turn ON all pixels (irrespective of RAM)

usleep(500000); // Wait 500ms

glcd_writeByte(0, 0xa4); // Entire Display NORMAL - Pixels correspond to display RAM

}

int main(void)

{

printf("Graphics LCD Display\n");

glcd_init();

}

*********************************************

GLCD Pin Specs:

----------------

LCD_DATA0: AA4

LCD_DATA1: AD1

LCD_DATA2: V8

LCD_DATA3: AB5

LCD_DATA4: AE2

LCD_DATA5: V5

LCD_DATA6: V6

LCD_DATA7: AB3

LCD_BS1: ??? Parallel Interface Selection*

LCD_CSn: AB24

LCD_D_Cn: D27

LCD_E_RDn: V7

LCD_RSTn: H7

LCD_WEn: AC4

LCD_SERn: ??? LCD Parallel/Serial DATA Select*

*********************************************

My SOPC system contains the following components:

• NIOS II Processor

• ON-Chip Memory 256Kb

• JTAG UART

• LCD_DATA
• LCD_CSn (1-bit PIO)

• LCD_D_Cn (1-bit PIO)

• LCD_E_RDn (1-bit PIO)

• LCD_RSTn (1-bit PIO)

• LCD_WEn (1-bit PIO)

The above code doesn't change my gLCD Display. The display is same even after programming the hardware.

Please help me for interfacing gLCD.

NOTE: * denotes that there are no pin assignments specified as such in Cyclone III Dev Ref Manual. Also I have not assigned pins for the signals such as

• LCD_BS1

• LCD_SERn