Gabriel
Joined: 03 Aug 2009
Posts: 1067
Location: Panama
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| IEE FLIP VFD 1x16 Screen driver |
 Posted: Tue Aug 19, 2014 11:32 am |
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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;
}
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G.
_________________
CCS PCM 5.078 & CCS PCH 5.093 |
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