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

[Altera_Forum]

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

[Altera_Forum]

In Nios II software build tools (Eclipse), make a new program from example. I am sure there is LCD routine in Web Server example since it shows IP address in the LCD, but You can check board diagnostics or other examples containing LCD control source.

[Altera_Forum]

--- Quote Start ---  In Nios II software build tools (Eclipse), make a new program from example. I am sure there is LCD routine in Web Server example since it shows IP address in the LCD, but You can check board diagnostics or other examples containing LCD control source.  --- Quote End ---    Hi,   My LCD routine works now. As you said, i used the code from a template file. But i dun quite understand the template file. Do you know how this line works??   FILE* fp; fp= fopen(LCD_DISPLAY_NAME, "w");  am i writing to the internal physical memory of the LCD module?? otherwise where is this file located at?   regards, Michael