Hi Colin,

Ya maken me feel guilty mate.

Thanks for the code regarding the lCD

Bit of tweaking and its now up and running.

Again thank you,

Kind Regards
Grant Brown

cdb wrote:
> :: I'm building a 3 digit LCD display trying to use a Microchip's
> :: AY0438
> :::: controller.
>
> Even though you have yet to acknowledge the code I sent twice directly to you, here is some outline code that directly 'talks' to glass LCD's without the need for a controller. I haven't looked up the uChip part, but doesn't its' datasheet have any code examples in it?
>
> The com pin goes to the centre of two resistors in series. The ends of the resistors connecting one each to Vcc and Ground. IOW a voltage divider. 
>
> I couldn't be bothered with comments in this version!
>
> C code for 2 common glass LCD 3.5 digits
>
> /************************************************************************
> **  Program for 3.5, 4.5 digit controllerless LCD's                    **
> **                                                                     **
> ** v0.1b                                                               **
> **copyright C.D. Barnard  7 February 2004                              **
> **                                                                     **
> ************************************************************************/
>
> /* PortB = LSD 
> ** PortC = Dig
> ** PortD = MSD
> ** PortE = DP,LoBat, +
> ** PortA = COM
> ** 
> ** Each set of segments are on the bottom 6 bits of the port, this leaves 
> ** portC bit 7 (Rx) free.
> **
> **/ 
> #define COM bRA0
> #include <pic.h>
> //#include <deftype.h>
> #include <delays.h>
> void display();
> void format(unsigned int n);
> void setup();
> /*uint*/
> // WORD power_10(WORD digit);
> void Interrupt();
> BYTE phase=0;
> struct flags
> {
>   bit dummy;
>   bit dummy;
>   bit dummy;
>   bit dummy;
>   bit dummy;
>   bit dummy;
>   bit dummy;
>   bit tmr0F;
> } flag;
>
> BYTE x,temp;
> WORD z,no;
> const char segments[12]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x67,0x6E,0x79}; This depends on glass column layout.
> //                            0     1    2    3     4     5     6     7    8     9    Y     E
> BYTE digits[4];
>
> void main()       // Function to 
> {
>  //unsigned int no; 
>   setup();
>
>  digits[3]=0;
> no=0; 
>
>   format(no);
>  while(1)
> {   display();
>     Wait(100);
>     format(no);
>      }
>   
> /*  digits[2]=segments[10];
>   digits[1]=segments[11];
>   digits[0]=segments[5];
> */     
>   
> }
>
>
>
>  void setup()       
> {
>   TMR0=0;
>   ADCON1=0x07;
>   PORTA=0x01;
>   PORTB=0;
>   PORTC=0;
>   PORTD=0;
>   PORTE=0;
>   TRISB=0;
>   TRISA=0;
>   TRISC=0;
>   TRISD=0;
>   TRISE=0;
>   OPTION_REG=(1<<PS2)|(1<<PS1)|(1<<PS0);
>   INTCON=(1<<GIE)|(1<<T0IE);		 
> }
>
> void Interrupt()
>  {
>    if (bT0IF)
>     {
>       bT0IF=0;
>       phase++;
>       flag.tmr0F=1;
>     }
>  }
>
>
> void display()      
> {
>  if (flag.tmr0F)
>   {
>     if (phase &1)
>      {
>        PORTE=digits[3];
>        PORTD=digits[2];
>        PORTC=digits[1];
>        PORTB=digits[0];
>        COM=0;
>        no++;
>      }
>     else
>      {
>        PORTE=~digits[3] ;
>        PORTD=~digits[2];
>        PORTC=~digits[1];
>        PORTB=~digits[0];
>        COM=1;
>      }
>     flag.tmr0F=0;
>     
>   }
> }
>
>
>
> void format(WORD n)
> {
>  WORD x;
>
>  x=0;
>  while (n >= 1000)
>  {
>    x++;
>    n-=1000;
>   
>   }
>     digits[3]=segments[x];
>     x=0;
>  
>    while(n >=100)
>    {   x++;
>         n -= 100;
>         
>    }
>  digits[2]=segments[x];
>  x=0;
>     while (n >= 10)
>     {
>    
>     n-=10;
>      x++;
>      
>     }
>   digits[1]=segments[x];
>  digits[0]=segments[n];
>  
>  
> } 
> --
> cdb, colin@btech-online.co.uk on 6/11/2008
>  
> Web presence: www.btech-online.co.uk  
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>   

-- 
Kind Regards
Grant Brown

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