Not able to display on NIOS II dev kit

Hi,

I have a NOIS II developpement Kit. I have open the mandelbrot demo. then re-generate the system with SOPC builder (I dont'know why there was not generated). I load the board with the .sof.

I have write this program with NIOS IDE : (it should draw a blue screen with the text "hello world" on the lcd screen)

# include <stdio.h># include <io.h># include "system.h"# include "altera_avalon_pio_regs.h"# include <stdlib.h> # include "alt_video_display.h"# include "alt_tpo_lcd.h"# include "altera_avalon_sgdma.h"# include "altera_avalon_sgdma_descriptor.h"# include "alt_tpo_lcd.h"# include "simple_graphics.h"

static void drawMenuBackground(int horiz_start, int vert_start, int horiz_end, int vert_end, alt_video_display * display)

{

unsigned int colour;

unsigned int red, green, blue;

float increment;

unsigned int counter = 0;

blue = 0xFF;

red = 0;

green = 0;

increment = 255 / ((float)(vert_end - vert_start));

while (vert_start <= vert_end)

{

colour = (red<<16) | (green<<8) | blue;

vid_draw_line(horiz_start, vert_start, horiz_end, vert_start, 1, colour, display);

counter++;

red = (unsigned int)(increment * counter);

green = (unsigned int)(increment * counter);

vert_start++;

}

}

void rotate_frame_buffers(alt_video_display * display)

{

while(alt_video_display_buffer_is_available(display) != 0)

{ }

alt_video_display_register_written_buffer(display);

}

int main()

{

alt_tpo_lcd s_lcd;

alt_tpo_lcd *lcd = &s_lcd;

int result;

alt_video_display * display;

lcd->scen_pio = LCD_I2C_CS_BASE;

lcd->scl_pio = LCD_I2C_SCL_BASE;

lcd->sda_pio = LCD_I2C_DAT_BASE;

display = alt_video_display_init( LCD_SGDMA_NAME,

800,

480,

32,

ALT_VIDEO_DISPLAY_USE_HEAP,

ALT_VIDEO_DISPLAY_USE_HEAP,

2);

result = alt_tpo_lcd_init(lcd, 800, 480);

if(!result) {

printf("LCD control registers initilized\n");

} else {

printf("LCD control register initialization failed\n");

}

char Text[] = "Hello world";

drawMenuBackground(0, 0, 799, 479, display);

vid_print_string_alpha(130, 50, RED_24, CLEAR_BACKGROUND, timesnewroman_24, display, Text);

rotate_frame_buffers(display);

return 0;

}

All is compiled and loaded successfully to the board but nothing works and I don't know why !!

If someone can help