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GLCD Driver Explanation Highlighting Text

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w_bwr

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Controller: PIC-18f452
Compiler : CCS v 4.125
GLCD: 96*60 KS0713 Family Graphic LCDs


I want to make changes to GLCD Driver and I don't understand the following things:

Print Character Routine:
Code: 
void dt_lcd_printchar(byte cvar)               // Write 1 character to LCD 
{ 
charsel=cvar; 
int i; 
for ( i = 0; i < 5; i++ ){ 
           if(charsel<0x50) dt_Lcd_Write_data(TABLE5[charsel - 0x20][i] << 1); 
           else if(charsel>0x4f) dt_Lcd_Write_data(TABLE6[charsel - 0x50][i] << 1); 
        }          // send data to nokia    
                              

  dt_lcd_write_data(0x00);               //    1 byte (always blank) 
}

TABLE5[48][5] contains the ASCII codes for characters.
dt_Lcd_Write_data() & dt_lcd_write_dorc routines are:

Code: 
oid dt_lcd_write_data(char bytefor_data) 
{ 
dt_cs=0; 
//nop;nop;nop;nop; 

dt_rs=1; 
dt_lcd_write_dorc(bytefor_data);   // write display data 


dt_cs=1; 
} 
////////////////////////////////////////////////////////////////////////////////// 
void dt_lcd_write_dorc(char bytefor)         // serial write data or command subroutine 
{ 
char caa; 
for (caa=8;caa>0;caa--) { 
      dt_sclk=0; 
      // delay_us(2); 
      if ((bytefor&0x80)==0){dt_sid=0;} 
      else {dt_sid=1;} 
      //nop;nop; 
      dt_sclk=1; 
      bytefor=bytefor<<1; 
      //nop;nop; 
               } 
}

Q1: How to set a single pixel?

Q2: I am create a menu in GLCD and want to highlight the text. For that purpose, I have draw a rectangle of dark pixels and write text in white. How to do that?

Q3:
t_lcd_write_data(char bytefor) takes a character as input then,
what is this supposed to mean?

Code: 
the " << 1 " in the following line: 

dt_Lcd_Write_data(TABLE5[charsel - 0x20][i] << 1);
 

Q1: How to set a single pixel?
Click to expand...
From your code it seems that dt_sid variable defines if the sent pixel is black or white.

Q2: I am create a menu in GLCD and want to highlight the text. For that purpose, I have draw a rectangle of dark pixels and write text in white. How to do that?
Click to expand...
There is an option to pass an extra argument inside dt_lcd_write_data(). If the argument tells to write negative, then you should invert the status of the dt_sid variable every time you send it to the lcd. I think you should invert the bits of bytefor argument for that purpose.
 

Still can't get it done.

Code: 
void pixel(int x,int y)
{
dt_lcd_gotoxy(x,y);
dt_sclk=0;
dt_sid=0;
dt_sclk=1;
}

I tried this code but this doesn't work. I have to draw black bar first and my driver doesn't have any line drawing or rectangle drawing routines .
 

Could you perform a test?
In the code as you originally posted in post #1 substitute these lines:

Code: 
if ((bytefor&0x80)==0){dt_sid=0;} 
  else {dt_sid=1;}

With those:

Code: 
if ((bytefor&0x80)==0){dt_sid=1;} 
  else {dt_sid=0;}

Then come back with the results.
 

alexxx said:
Could you perform a test?
In the code as you originally posted in post #1 substitute these lines:

Code: 
if ((bytefor&0x80)==0){dt_sid=0;} 
  else {dt_sid=1;}

With those:

Code: 
if ((bytefor&0x80)==0){dt_sid=1;} 
  else {dt_sid=0;}

Then come back with the results.
Click to expand...

It doesn't display anything. May be, it is because it wrote the characters in White and I can't see it because the background is also white.



I don't think that it worked at all. if we assume that dt_sid=1 writes Black character and dt_sid=0 writes white. Then it should display all pixels dark except the characters, because of the following line:
Code: 
 else {dt_sid=0;}
 
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