How to "printf" to my 16207 Optrex lcd controller ?

Hi there,

I've spent lots of time on this, but S.O.L.. cant solve this one.

I am trying to output a string of texts (sometimes with integer variable) to my LCD controller using printf() (or similar) through NIOS 2, using Eclipse IDE.

I can verify my connection is good, and my LCD and NIOS 2 works fine too, as i can use the HAL to manually initialize the LCD, delay, and also to output text like the following;

///////////////////////////////////////////////////////////////////////////////////////

void lcd_init(void){

IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x38);

usleep(1000);

IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x0C);

usleep(1000);

IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x01);

usleep(1000);

IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0x06);

usleep(1000);

}

///////////////////////////////////////////////////////////////////////////

void lcd_print(char *pText){

int i=0;

while(pText!='\0') // loop until the eof

{

switch(ptext)

{

case '\f':IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 1);

usleep(2000);

break;

case '\n':IOWR_ALTERA_AVALON_LCD_16207_COMMAND(LCD_BASE, 0xC0);

usleep(1000);

break;

default: IOWR_ALTERA_AVALON_LCD_16207_DATA(LCD_BASE, pText[i] );

usleep(1000);

break;

}

i++; // get ready for the next character in the string

} // end of while

return;

}

/////////////////////////////////////////////////////////////////////////////////

I wrote these functions, it works well, but it does not take any variable like the following;

lcd_print("the number is: %d", A) .

my function can only output pure ASCII character.

I found some example online that could potentially do this, shown in the following;

//////////////////////////////////////////////////////////

FILE* fp;

fp= fopen("LCD_NAME", "w");

if (fp == NULL) {

fprintf(stderr, "open failed\n"); return 0;

}

fprintf(fp, "The time now is %d", time);

//////////////////////////////////////////////////////////////

I can't make this code work. my question is WHY??

I don't understand how this code can work, as it does not initialize, and it does not contain any delay. Can anyone correct this?

Thank you.

Michael