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Port Changing GLCD Driver

 
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MFK



Joined: 24 Oct 2007
Posts: 12

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Port Changing GLCD Driver
PostPosted: Wed Jan 23, 2008 5:19 pm     Reply with quote
Hi ,
I'm using a PIC18f4520 with an 240x128 LCD. It is working fine. I'm
using the glcd Driver. My question is probably very easy but I don't get
it. I want to change the controlling part from Port C to Port B. I want to
use C6 and C7 for RS232. At the code i changed this

#byte LCD = 0xf82 // portC address on 18F452 ---> to 0xf80

Afterwards the display didn't work any more. Do I have to change
something else ?

-----------------------------------
Complete Code
Code:

/////////////////////////////////////////////////////////////////////////
////    T6963C.c     -      T6963C driver                            ////
////   Not for comercial Use                                         ////
////      Driver by treitmey Graphic functions and Resolution Select ////
////                                    by endSly (endsly@gmail.com) ////
////                                                                 ////
//// This file contains drivers for using a Tosiba T6963C controller ////
//// in parallel/8080(intel) mode.  The T6963C is 240 pixels across  ////
////  and 64 pixels down. The driver treats the upper left pixel 0,0 ////
////                                                                 ////
////  Connections are as follows:                                    ////
////  /WR - - C4                                                     ////
////  /RD - - C5                                                     ////
////  C//D- - C6                                                     ////
////  /RST- - C7                                                     ////
////  DATA0-7 PORTD0-7                                               ////
////  LCD's FS is tied low (FS = 0 is 8x8 font)                      ////
////                                                                 ////
/////////////////////////////////////////////////////////////////////////

// 240 x 64 in the 8x8 font mode means that 30 characters across by
// 8 rows of characters may be displayed

#define set_tris_lcd(x) set_tris_d(x)
#define LCDColorBlack 0b1
#define LCDColorWhite 0b0

//TRIS DataBus=x,  note:control bus (PORTC) always outputs
unsigned int16 TextHome = 0x0F00;//0x0780;
const int8  TextArea = 0x001E; // how many bytes before a new line
const int16 GraphicsHome = 0x0000;
const int8  GraphicsArea = 0x001E; // how many bytes before a new line

const int8 AutoModeWrite = 0xB0;
const int8 AutoModeRead  = 0xB1;
const int8 AutoModeReset = 0xB2;

const int8 LCDModeSet  = 0x80;   // send this OR'd with the following
const int8 LCDMode_OR  = 0b0000;
const int8 LCDMode_XOR = 0b0001;
const int8 LCDMode_AND = 0b0010;
const int8 LCDMode_TA  = 0b0100; // TEXT ATTRIBUTE mode.
const int8 LCDMode_RAM = 0b1000; // 1=CG RAM, 0=internal CG ROM

const int8 LCDSetCursorPtr  = 0x21;  // cursor address
const int8 LCDSetCursorSize = 0xA0;  // 1 line cursor

const int8 LCDDispMode = 0x90;   // send this OR'd with the following
const int8 LCDDisp_BLK = 0b0001;
const int8 LCDDisp_CUR = 0b0010;
const int8 LCDDisp_TXT = 0b0100;
const int8 LCDDisp_GRH = 0b1000;

const int8 LCDBitSet   = 0xF8;
const int8 LCDBitReset = 0xF0;
const int8 LCDBit0 = 0b000;
const int8 LCDBit1 = 0b001;
const int8 LCDBit2 = 0b010;
const int8 LCDBit3 = 0b011;
const int8 LCDBit4 = 0b100;
const int8 LCDBit5 = 0b101;
const int8 LCDBit6 = 0b110;
const int8 LCDBit7 = 0b111;

const int8 LCDSetPtr = 0xE0;



struct lcd_pin_def
{
   BOOLEAN unused1;    // C0
   BOOLEAN unused2;    // C1
   BOOLEAN unused3;  // C2
   BOOLEAN unused4;  // C3
   BOOLEAN w_bar;  // C4 Write bar active low
   BOOLEAN r_bar;  // C5 Read bar active low
   BOOLEAN cd;         // C6 Command/Data BAR   1=command 0=data
   BOOLEAN reset_bar;  // C7 Reset active low
   int  data    :  8;  // PortD=Data bus
};
struct lcd_pin_def  LCD;

  #byte LCD = 0xf82    // portC address on 18F452

int   glcd_ReadByte(void);
void  glcd_WriteByte(int1 cd, int data);
void  glcd_WriteByteAuto(int data);
void  glcd_WriteCmd2(int16 data, int cmd);
void  glcd_WriteCmd1(int data, int cmd);
void  glcd_ (int x, int y, int1 text);

#inline
void glcd_init(unsigned int16 res_x, unsigned int16 res_y) {



  int16 counter;

  TextHome = (res_x/8)*res_y; //0x0F00;//0x0780;

  set_tris_c(0x00);  // graphic lcd control lines all output
  set_tris_lcd(0xff);   //TRIS DATA bus,note:control bus always outputs

  LCD.w_bar = 1;      // INITIAL STATES OF CONTROL PINS
  LCD.r_bar = 1;      //
  LCD.cd = 1;         // command

  LCD.reset_bar = 0;  // perform a reset
  delay_us(10);      // delay for a reset
  LCD.reset_bar = 1;  // run

  // Set up the graphics and text areas
  glcd_WriteCmd2(TextHome, 0x40);
  glcd_WriteCmd2(TextArea, 0x41);
  glcd_WriteCmd2(GraphicsHome, 0x42);
  glcd_WriteCmd2(GraphicsArea, 0x43);

  // set address to 0
  glcd_WriteCmd2(0x0000, 0x24);
  glcd_WriteCmd2(0x0000, 0x24);

  // Clear all RAM of LCD (8k)
  glcd_WriteByte(1, AutoModeWrite);
  for (counter = 0; counter < 0x1fff; counter++)
  {
    glcd_WriteByteAuto(0);    // fill everything with zeros
  }
  glcd_WriteByte(1, AutoModeReset);
}

void glcd_WriteByte(int1 cd, int data)
{
    int status = 0, temp = 0;
    set_tris_lcd(0xff);
    LCD.w_bar = 1;
    LCD.r_bar= 1;
    LCD.cd = 1;//defaults

    while (status != 0x03) {  // is LCD busy?
       LCD.r_bar= 0;
       temp = LCD.data;
       LCD.r_bar = 1;
       status = temp & 0x03;
   }

    set_tris_lcd(0x00);    // All outputs
    LCD.cd = cd;           // Command/Data bar
    LCD.data = data;
    LCD.r_bar = 1;         // not read
    LCD.w_bar = 0;         // write
    LCD.w_bar = 1;         // release
}


void glcd_WriteByteAuto(int data)
{
   int status = 0, temp = 0; // status bits ARE DIFFERENT BITS THAN NORMAL
   set_tris_lcd(0xff);
   LCD.w_bar = 1;
   LCD.r_bar = 1;
   LCD.cd = 1; // defaults

   while (status != 0x08) {  // is LCD busy?
     LCD.r_bar = 0;
     temp = LCD.data;
     LCD.r_bar = 1;
     status = temp & 0x08;
   }

   set_tris_lcd(0x00);     // All outputs
   LCD.cd = 0;             // This is always data, cd=0
   LCD.data = data;        // Put data on data bus
   LCD.w_bar = 0;          // write
   LCD.w_bar = 1;          // release
}

void glcd_WriteCmd1(int data, int cmd)
{
  glcd_WriteByte(0, data);
  glcd_WriteByte(1, cmd);
}

void glcd_WriteCmd2(int16 data, int cmd)
{
  glcd_WriteByte(0, data & 0xff);
  glcd_WriteByte(0, data>>8);
  glcd_WriteByte(1, cmd);
}

int glcd_ReadByte(void)
{
  int data = 0, status = 0, temp = 0;
  set_tris_lcd(0xff);
  LCD.w_bar = 1;
  LCD.r_bar = 1;
  LCD.cd = 1;  // defaults

  #asm nop #endasm

  while (status != 0x03) {  // is LCD busy?
    LCD.r_bar = 0;
    temp = LCD.data;
    LCD.r_bar = 1;
    status = temp & 0x03;
  }

  LCD.cd = 0;          // Command/Data bar
  LCD.r_bar = 0;        // read
  /////////////////////////////////////////////////////////
  #asm nop #endasm    // THIS PAUSE IS VERY NESSESARY !!!//
  /////////////////////////////////////////////////////////
  data = LCD.data;
  LCD.r_bar = 1;
  LCD.cd = 1;
  return data;        // Return the read data
}

void glcd_putc(char c) {
   glcd_WriteCmd1(c - 0x20, 0xc0);
}

void glcd_gotoxy(int x, int y, int1 text) { // sets memory location to screen location x, y
   // location 1,1 is upper left corner;  text = 1 (text area), text = 0 (graphics area)
   int16 location, home;
   int line;

   if (!text) {
      home = GraphicsHome;
      line = GraphicsArea;
   } else {
      home = TextHome;
      line = TextArea;
   }

   location = home + (((int16)y) * line) + x;
   glcd_WriteCmd2(location, 0x24);
}

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
// Purpose:       Clears LCD RAM
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - //
void glcd_clr(int16 location,int16 size)
{
  ////fprintf(DEBUG,"loc=%lu  size=%lu\n\r",location,size);
  // look very simular to the init,... doesn't it. : )
  glcd_WriteCmd2(location,LCDSetPtr);
  glcd_WriteCmd1(1,AutoModeWrite);
  for (;size;size--)
  {
    glcd_WriteByteAuto(0x00);//clear ram
  }
  glcd_WriteCmd1(1,AutoModeReset);
}

/////////////////////////////////////////
// Graphics Controller by endSly (c)2007
//    endSly@gmail.com
//       Not for comercial use
/////////////////////////////////////////

unsigned int8 i;  //General Purpouse variable

// glcd_pixel(x,y,c) sets pixel x,y with c color
void glcd_pixel(unsigned int8 x, unsigned int8 y, int1 c){
   unsigned int8 x_H;
   unsigned int8 x_L=0;
   x_H = (x / 8);
   x_L = 7 - (x - 8*x_H);
   glcd_gotoxy(x_H,y,0);    //Bug fixed, thanks to etiedon
   if(c){
      glcd_WriteCmd1(1,(LCDBitSet|x_L));
   } else {
      glcd_WriteCmd1(1,(LCDBitReset|x_L));
   }
}

// glcd_pixel8(x,y,px8) sets 8 pixels in line.
void glcd_pixel8(unsigned int8 x, unsigned int8 y, int8 pixel8){
   unsigned int8 x_H;
   x_H = (x / 8);
   glcd_gotoxy(x_H+1,y,0);
   glcd_WriteCmd1(pixel8,0xc0);
}

// glcd_line(x0,y0, x1,y1, c) puts line from (x0, y0) to (x1, y1) with c color
#separate
void glcd_line(signed int16 x0, signed int16 y0,
               signed int16 x1, signed int16 y1 , int1 c){
   int16 x;
   int16 y;
   unsigned int16 n;
   int1 m_case;

   x=abs(x1-x0);
   y=abs(y1-y0);

   if (y > x){
      n=(y1-y0);
      m_case=1;
   } else {
      n=(x1-x0);
      m_case=0;
   }
   for(i=0 ; i<=n ; i++){
      if (m_case){
         y=i + y0;
         x=(y*(x1-x0))/(y1-y0) + x0;
      } else {
         x=i + x0;
         y=(x*(y1-y0))/(x1-x0) + y0;
      }
      glcd_pixel(x, y,c);
   }

}

// glcd_square(x0,y0,x1,y1, c) sets square
void glcd_square( unsigned int8 x0, unsigned int8 y0,
                  unsigned int8 x1, unsigned int8 y1 , int1 c){
   glcd_line(x0,y0, x1,y0, c);
   glcd_line(x1,y0, x1,y1, c);
   glcd_line(x0,y1, x1,y1, c);
   glcd_line(x0,y0, x0,y1, c);
}

// glcd_box(x0,y0,x1,y1, c)
void glcd_box( unsigned int8 x0, unsigned int8 y0,
               unsigned int8 x1, unsigned int8 y1 , int1 c){
   unsigned int8 x;
   unsigned int8 y;
   for(y=y0; y<=y1;y++){
      for(x=x0; x<=x1;x++){
         if((!(x%8)) && ((x1-x)>8)){
            glcd_pixel8(x,y,0xFF*c);  //Same time to write 8 pixel
            x +=7 ;
         } else {
            glcd_pixel(x,y,c);
         }
      }
   }
}

//glcd_image8 (*Pic, x, y, size_x, size_y)
void glcd_image8(int8 *pic_px, unsigned int8 x, unsigned int8 y,
                 unsigned int8 size_x, unsigned int8 size_y){

   unsigned int8 px_y;
   unsigned int8 px_x;
   unsigned int8 px=0;

   for(px_y=y; px_y<(y+size_y); px_y++){
      for(px_x=x; px_x<(x+size_x); px_x+=8){
         glcd_pixel8(px_x, px_y, *(pic_px+px));
         px+=1;
      }
   }
}
#use fast_io(D)

Thank for helping me. I really appreciate.

greetz to all.
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Wed Jan 23, 2008 5:47 pm     Reply with quote
If you change from port C then you also need to change the TRIS. this is because we are using fast_io.

Look for TRIS_C and change to TRIS_xx.
MFK



Joined: 24 Oct 2007
Posts: 12

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PostPosted: Thu Jan 24, 2008 6:24 am     Reply with quote
Thanks for the quick response. I haven't tried until now but
i'm sure it will work.

Thanks.
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