430 controls 6963c to drive LCD

/*****************************************************************************

Read LCD status word to STA

Function: Used to judge busy/idle before writing data or commands to the LCD

******************************************************************************/

void read_sta(void)

{

   P4DIR = 0x00;           //P4 data input

   P3OUT =   P3_2_DATAIO; //4245 ( x1 ) data transmission direction selection: from LCD to 430

   P3OUT =   P3_1_CD;      // Command mode

   P3OUT &= ~P3_0_RD;     //read

   STA = P4IN;             // Read back status

   P3OUT  = P3_0_RD;      //cancel read

   P4DIR = 0xff;           //P4 port is set to data output mode    

   P3OUT &= ~P3_2_DATAIO; //4245 ( x1 ) data transmission direction selection: from 430 to LCD

}

/*****************************************************************************

Judge the status bit S1, S0 function ( read and write instructions and read and write data status )

******************************************************************************/

void ST1( void )

    {

      do

        {

        read_sta();

        }

      while( (STA & 0x03) != 0x03 );

    }

/*****************************************************************************

Status bit S2 function ( data automatic reading status )

******************************************************************************/

void ST2( void )

   {

     do

     {

       read_sta();

     }

    while( (STA & 0x04) != 0x04);

   }

/*****************************************************************************

- Status bit S3 function ( data automatic write status ) -

******************************************************************************/

void ST3( void )

   {

     do

     {

       read_sta();

     }

     while( (STA & 0x08) != 0x08 );

   }

/*****************************************************************************

Write data byte

******************************************************************************/

void write_data(unsigned char Byte )

{

        ST1();

        P4OUT = Byte;

        P3OUT &= ~P3_1_CD;        // Data mode

        P2OUT &= ~P2_7_WR ;      // write

        P2OUT  =  P2_7_WR ;    

}

/*****************************************************************************

Automatically write data bytes

******************************************************************************/

void autowrite_data(unsigned char Byte )

{

        P4OUT = Byte;

        P3OUT &= ~P3_1_CD;        // Data mode

        P2OUT &= ~P2_7_WR ;      // write

        P2OUT  =  P2_7_WR ;    

}

/*****************************************************************************

Write command word

******************************************************************************/

void write_cmd(unsigned char cmd )

{

        ST1();

        P4OUT = cmd ;

        P3OUT =   P3_1_CD   ;       // Command mode

        P2OUT &= ~P2_7_WR ;       // write

        P2OUT  =  P2_7_WR ;    

}

/*****************************************************************************

Writing commands with only one argument

******************************************************************************/

void write_onepara(unsigned char dat1,unsigned char command )

{

        write_data( dat1 );

        write_cmd( command );

}

/*****************************************************************************

Write a command with two parameters

******************************************************************************/

void write_doublepara(unsigned char dat1,unsigned char dat2,unsigned char command )

{

        write_data( dat1 );

        write_data( dat2 );

        write_cmd( command );

}

/*****************************************************************************

Function to clear the display buffer

******************************************************************************/

void CLEAR_RAM( void )

    {

    int i;

    write_doublepara( 0x00,0x00,0x24 );        /* Set the first address of display RAM */

    write_cmd( 0xb0 );                         /* Set automatic write mode */

    for(i=0;i<8200;i++)                        /* Clear 8K memory */

       {         

         ST3();                                /* Judge status bit S3 */

         write_data(0x00);                     /* write data */            

        }

     write_cmd( 0xb2 ); /*                        Set automatic write end instruction */        

    }

/*****************************************************************************

Some initial setting functions for the LCD screen

******************************************************************************/

void LcdIni( void )

    {

       write_doublepara(0x00,0x00,0x40);        /* Set the first address of the text display area */

       write_doublepara(0x28,0x00,0x41);        /* Set the text display area width */

       write_doublepara(0x03,0x00,0x22);     /* Set CGRAM bias address */

       write_doublepara(0x00,0x08,0x42);        /* Set the first address of the graphics display area */

       write_doublepara(0x1e,0x00,0x43);        /* Set the width of the graphics display area */

//       write_cmd(0xa2);                         /* Cursor shape setting */   

  //      write_doublepara(0x08,0x08,0x21);        /* Set the cursor position */

       write_cmd(0x80);                         /* Display mode settings logical " or " synthesis , internal character generator is effective */

       write_cmd(0x98);                         /* Display switch setting: turn off text and turn on graphic display */

       CLEAR_RAM();

    }