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Custom Character on LCD

 
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aderogba



Joined: 03 Jun 2005
Posts: 8

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Custom Character on LCD
PostPosted: Tue Jul 05, 2005 1:23 pm     Reply with quote
Please I need some help with this code developed using input from this forum. I can't get any custom character to print. I'm using 18F452 with hantronix LCD.


Code:
void lcd_print_str(char* lcd_str)
{
   char str[16];
   int8 i;

   sprintf(str,"%c",'\0');

   if(strlen(lcd_str)>STRING_LENGTH)
   {
      strcpy(str,"str 2 long");
   }
   else
   {
      strcpy(str,lcd_str);
   }

   for(i=0; i<strlen(str); i++)
      lcd_putc(str[i]);

}




void lcd_print_custom(char* custom)
{

   int8 i;

   lcd_send_byte(0,0x40);  // 0 = command mode, 0x40 = write to CGRam location 0

   for(i=0;i<sizeof(custom);i++)    // 1 = display mode, load cursor line 1 to 8
   {
      delay_us(200);
      lcd_send_byte(1,custom[i]);
   }
   lcd_send_byte(1,0x300);
}

void main()
{

   BYTE lcd_custom[8] = {0x1f,0x11,0x0a,4,0x0a,0x11,0x1f,0};
   char str[16];

   lcd_init();


   lcd_print_custom(lcd_custom, 0, 0);


   while(TRUE);
}
Ttelmah
Guest
PostPosted: Tue Jul 05, 2005 2:23 pm     Reply with quote
lcd_print_custom, as you have it written, expects one variable. You are sending it three.
You don't show your 'lcd_send_byte' command, but assuming it is designed to handle 'bytes', you send it a 0x300 value, which is too large for it to cope with.
Remember 'String Length' will have to be 15, if your test for the string being too long is going to work.
These are the obvious ones I can see in the bit of code posted. There are probably more.

Best Wishes
Guest
PostPosted: Wed Jul 06, 2005 10:56 am     Reply with quote
The initial version of the code uses lcd_send_byte(1,0). I later changed it in the process of troubleshooting. I use the code for other testing, I didn't completely strip the posted code of these extras. My major problem is with the command to pass to lcd_send_byte to print custom character
Ttelmah
Guest
PostPosted: Wed Jul 06, 2005 3:05 pm     Reply with quote
Since you don't show the lcd_send_byte function, you are not going to get many answers...
The eight custom characters appear as the characters 0x00 to 0x07, in the character set of the LCD. Assming LCD_send_byte, does not intercept the values, start by sending it a '0'.

Best Wishes
aderogba



Joined: 03 Jun 2005
Posts: 8

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PostPosted: Thu Jul 07, 2005 10:07 am     Reply with quote
Thanks for your response. The lcd_send_byte function I'm using is exactly the same one that comes from CCS in the lcd.c file. I've seen it in use by others in this forum so I think it will be sufficient for my use without any modification.
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