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IEE FLIP VFD 1x16 Screen driver

 
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Gabriel



Joined: 03 Aug 2009
Posts: 959
Location: Panama

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IEE FLIP VFD 1x16 Screen driver
PostPosted: Tue Aug 19, 2014 11:32 am     Reply with quote

Hi All,

This is a little serial driver for a VFD screen I had.

You can see the screen in action here:
https://hackaday.io/project/2391-VFD-Shenanigans

It just sees the incoming characters and if there is a comma or period it substitutes the previous character with the corresponding character value that includes a comma.

In other words it allows you to display data like:

[A, B, C. D.]

Instead of

[A , B , C . D .]

Without this "driver" the commas and periods would use an entire character space on their own.


Test Program:

Code:
#include <16f886.h>
#device adc=8
#device *=16

#fuses HS,NOWDT,NOPROTECT,NOLVP,NOBROWNOUT,NODEBUG

#use delay(clock=20000000)

#include "FLIP_VFD_1x16.c"
   
//==========================


void main()
{
    while(1)
    {
   
      putc(EOL_MODE3);      // set screen wraping mode

      //Test escape characters
      Printf(Subset,"\n\r---- \' \" \\ ----");
      delay_ms(3000);

      //Test Symbols with periods & commas   
      Printf(Subset,"\n\r#,. ,?,.%,$.*,/.+.-,}{_.(,");
      delay_ms(3000);

      //Test Letters with periods & commas
      Printf(Subset,"\n\ra,b,c,x,y,z,@.A.B.C.X.Y.Z.");
      delay_ms(3000);

    }
}



Driver:

Code:
#define COMM_PIN    PIN_B0   // Serial pin to talk to VFD

#define CLR_DISPLAY 0x0A    // AKA: Line Feed - '\n'
#define CR_RETURN   0x0D    // AKA: Return '\r'
#define BACK_SPACE    0x08
#define FWD_SPACE    0x09
#define BLINK      0x0B
#define NO_BLINK    0x0C
#define VIEW_CURSOR   0x0F
#define HIDE_CURSOR 0x0E

#define EOL_MODE1    0x11   // Default - Automatic CR
#define EOL_MODE2    0x12   // Overwrite Rightmost char
#define EOL_MODE3    0x13   // Scroll right to left


#use rs232(baud=1200, xmit=COMM_PIN,STOP=2, ERRORS) // Software Serial

char Previous_Char;         // Global Var
void Subset(char);         // Fuction Declaration


void Subset(char Next_Char)
{
   if((Next_Char=='.')&&(Previous_Char<0x80)&&(Previous_Char!='.'))
   {
      putc(BACK_SPACE);
         if((Previous_Char>0x60)&&(Previous_Char<0x7B))
         {
            Previous_Char-=0x20;
         }
      Next_Char=Previous_Char|0x80;
   }

   if((Next_Char==',')&&(Previous_Char>0x3F)&&(Previous_Char!=','))
   {
      putc(BACK_SPACE);
         
         if((Previous_Char>0x60)&&(Previous_Char<0x7B))
         {
            Previous_Char-=0x20;
         }
      Next_Char=Previous_Char|0xA0;
   }

   if((Next_Char==',')&&(Previous_Char<0x40)&&(Previous_Char!=','))
   {
      putc(BACK_SPACE);
      Next_Char=Previous_Char+0x60;
   }

   putc(Next_Char);
   Previous_Char=Next_Char;
}



G.
_________________
CCS PCM 4.135 & CCS PCH 5.013
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