Graphic LCD display problem (Stratix III or Cyclone III)

Hello all,

In order to use the graphic LCD as output monitor, I implemented a nios cpu (with onchip, jtag, and 6 PIO as in and out pins of the LCD) on my FPGA. The problem that I dont have any change in the LCD.

The software is:

# 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(PIO_D_CN_BASE, 1); //write a command;

}

else

{

IOWR_ALTERA_AVALON_PIO_DATA(PIO_D_CN_BASE, 0); //write data;

}

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

usleep(2); //wait 2 us

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

usleep(2); //wait 2 us

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

usleep(2); //wait 2 us

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

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

}

void glcd_init(void)

{

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

IOWR_ALTERA_AVALON_PIO_DATA(PIO_WE_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(PIO_D_CN_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(PIO_CSN_BASE, 1);

IOWR_ALTERA_AVALON_PIO_DATA(PIO_RST_BASE, 0); // Hard reset

usleep(20); // Wait 20us;

IOWR_ALTERA_AVALON_PIO_DATA(PIO_RST_BASE, 1); // 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 corre

}

int main()

{

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

glcd_init();

return 0;

}