Graphics LCD problem with Cyclone III FPGA Development Kit

Hi,

I was also looking to use the graphics LCD in Stratix III. Good to see your post. I saw that same Graphics LCD is used in Cyclone III as well as Stratix III.

I wanted to ask a few questions regarding how to make it work.

Here is what I did after seeing your example ... In the standard NIOS example, I did the following things...

1) In SOPC builder, I put 6 different PIO ports - oled_data (8 bits), oled_csn(1 bit), oled_d_cn(1 bit), oled_e_rdn(1 bit), oled_rstn(1 bit), oled_wen(1 bit).

2) synthesized the whole thing in quartus and programmed to Stratix III.

3) Used eclipse, and the program is the following, which i modified

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

int main()

{

printf("Hello from Nios II!\n");

IOWR_ALTERA_AVALON_PIO_DATA(OLED_E_RDN_BASE, 1); // Set all glcd pins HIGH

IOWR_ALTERA_AVALON_PIO_DATA(OLED_WEN_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(OLED_D_CN_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(OLED_CSN_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(OLED_RSTN_BASE, 0); // Hard reset

usleep(20); // Wait 20us;

IOWR_ALTERA_AVALON_PIO_DATA(OLED_RSTN_BASE, 1); // Release reset;

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

IOWR_ALTERA_AVALON_PIO_DATA(OLED_DATA_BASE, 0xe2); // Internal Reset

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

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

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

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

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

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

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

usleep(500000); // Wait 500ms

usleep(500000);

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

return 0;

}

I couldn't see any change in the graphics LCD panel...it is always light with blue light and it stays same...

can u tell what I might have done wrong..

thanks

pramod

Your problem is that you replaced my glcd_write() parts of the code by directly writing to the port pins. This is the crucial initializing step and should be done as i did in my code using the following glcd_write() function:

void glcd_writeByte(int DI, int data)

{

if (DI == 1)

{

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_D_CN_BASE, 1); //write a command;

}

else

{

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_D_CN_BASE, 0); //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_EN_BASE, 0); //pull the ENABLE pin low to enable writing to the LCD

usleep(2); //wait 2 us

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_WEN_BASE, 0); //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, 1); //pull the ENABLE pin high to disable writing to the LCD

IOWR_ALTERA_AVALON_PIO_DATA(GLCD_EN_BASE, 1); //pull the Write Enable pin high to disable writing to the LCD

}

This should then work. Just another thing: the data pins should actually be bi-directional pins to allow reading from the GLCD as well - just thought i will mention it.

I would like to know if this works with your display and what the display looks like after you have initiallized it.

hi,

that code perfectly ... the LCD changed from default all blue background to

now spots of light blue and dark blue all over the LCD...

is that what you also got ...

what should I do if I have to display some picture or some name ...

how should I pass the data ...

thanks for your function glcd_writeByte .. it worked beautifully..

pramod