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#Define of a print function - Still not working / Full code

 
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Gabriel



Joined: 03 Aug 2009
Posts: 1067
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#Define of a print function - Still not working / Full code
PostPosted: Thu Aug 14, 2014 9:44 pm     Reply with quote
Hi all,

Im working a simple driver for an old VFD display.
It works fine but while converting it to a "Driver" i wanted to do the following:

Currently i print to the screen like so:
Code:
Printf(Subset,"\n\r1.2.3.A.B.C.x.y.z.a.b.c.X.Y.Z.@.");


But i think it looks prettier like so:
Code:
Print_VFD("\n\r1.2.3.A.B.C.x.y.z.a.b.c.X.Y.Z.@.");



So im trying to make a define that will allow me to replace

Printf(Subset, with Print_VFD(


Subset(char) is a function necessary to handle the commas and periods on the screen.


The driver will be up in the library as soon as i get this done with.

G.
_________________
CCS PCM 5.078 & CCS PCH 5.093

Last edited by Gabriel on Sat Aug 16, 2014 2:31 pm; edited 1 time in total
PCM programmer



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Posts: 21708

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PostPosted: Thu Aug 14, 2014 10:15 pm     Reply with quote
I'm not totally sure what you want, but this is an example.
It produces this output in MPLAB simulator:
Quote:
1,2,3,A,B,C,x,y,z,a,b,c,X,Y,Z,@,

Test program:
Code:
#include <18F4620.h>
#fuses INTRC_IO, BROWNOUT, PUT, NOWDT
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS)

// This is some kind of filter function.
// Internals are unknown, so make it
// replace periods with a comma, just
// to have it do something.
void Subset(char c)
{
if(c == '.')
   putc(',');
else
   putc(c);
}

#define Print_VFD(x) printf(Subset, x)

//===================================
void main()
{

Print_VFD("\n\r1.2.3.A.B.C.x.y.z.a.b.c.X.Y.Z.@.");

while(1);
}
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

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PostPosted: Sat Aug 16, 2014 7:06 am     Reply with quote
Hi PCM,

Thanks for the reply.
I only got a chance to compile my code with your changes and it did... sorta.
When printing things like '\'' it gives me a define error.

It seems to be working for all characters not requiring an escape character.

I'll let you know how it goes later today when get to fully test it.

G.
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Ttelmah



Joined: 11 Mar 2010
Posts: 19513

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PostPosted: Sat Aug 16, 2014 8:57 am     Reply with quote
That is standard C.....

Because the '\' character, is used as the 'intro' character for the escapes (\n, \r etc.), it can't be used as a single character in a string.
The escape to send backslash, is "\\". Any C textbook, and the CCS manual (though it takes a bit of finding), will tell you this (do a search for the word 'backslash').
Gabriel



Joined: 03 Aug 2009
Posts: 1067
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PostPosted: Sat Aug 16, 2014 2:06 pm     Reply with quote
Hi Ttelmah,

I am well aware of the properties of \ while printing.

My point was that:

Code:
Printf(Subset,"abc, \', yxz");


works just fine, but:

Code:
Print_VFD("abc, \', yxz");


Does not.

Something changes when using the #define as proposed by PCM.

G.
_________________
CCS PCM 5.078 & CCS PCH 5.093
Gabriel



Joined: 03 Aug 2009
Posts: 1067
Location: Panama

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PostPosted: Sat Aug 16, 2014 2:29 pm     Reply with quote
Full Code below:

The problem persists...

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

#define Print_VFD(x)   Printf(Subset,x)   // Print Handle for Easier coding

#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;
}



When testing the escape chars, using the #define "macro" does not compile. however using the normal Printf works fine.



I hope that helps you help me.


Kind regards,
G
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PCM programmer



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Posts: 21708

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PostPosted: Sat Aug 16, 2014 3:45 pm     Reply with quote
Quote:
When testing the escape chars, using the #define "macro" does not compile.
//Test escape characters
//Print_VFD("\n\r---- \' \" \\ ----");

If you use the Octal code (\042) instead of the double quote (\"),
then it compiles. Example:
Code:
Print_VFD("\n\r---- \' \042 \\ ----");


The line above displays this output:
Code:
---- ' " \ ----
Ttelmah



Joined: 11 Mar 2010
Posts: 19513

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PostPosted: Sun Aug 17, 2014 1:43 am     Reply with quote
You don't have to do this. Simply redefine PCM's macro as:

Code:

#define Print_VFD(x)   Printf(Subset,#x)   // Print Handle for Easier coding


The problem is 'double expansion'. When a string is passed like this in a macro, the macro language 'parses' the internal constants. So what arrives at the final code, is already expanded.
To do a 'raw' pass, adding the # to the macro definition, prevents this parsing.

However there are a couple of other 'problem' characters in your string.

The '%' remember, is the format specifier for printf, and you have it in your 'symbols' example. This needs to be passed as %%:

Code:

      Print_VFD("\n\r#,. ,?,.%%,$.*,/.+.-,}{_.(,");
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