How to use Interrupt in PIC16F877A in C..??

[koolguy]

show me an example of what you want to see on the leds...

similar like .....

 

[Ian Rogers]

That's a lot of leds... 16x32 produces ( well not so good )



When it comes to graphical images you have to get a proper imaging tool to get the best results

 

[koolguy]

When it comes to graphical images you have to get a proper imaging tool to get the best results

Which tool are you using...??

 

[Ian Rogers]

I just drew that in paint... Have you downloaded FASTLcd? If you draw a bitmap in paint ( black and white bmp ) you can load it into FASTLcd then output a "*.BAS" file.. I then convert it to C in Textpad by renaming all the "&H" to "0x" and put it in a file so I can include it in my C build...

The best results are achieved by using Photoshop or Paint shop pro... With these you can bring a picture down to 1 bit neater...

 

[koolguy]

OK, for making clear pic i should use 24x40 LED so, i should do this in layout PCB design i am confused as i have made 16x40 led in pcb123 but how to add 24x40 will be bit more complicated...
i will order to pcb power for making pcb...may be double side!!

 

[koolguy]

I just drew that in paint... Have you downloaded FASTLcd? If you draw a bitmap in paint ( black and white bmp ) you can load it into FASTLcd then output a "*.BAS" file.. I then convert it to C in Textpad by renaming all the "&H" to "0x" and put it in a file so I can include it in my C build...

The best results are achieved by using Photoshop or Paint shop pro... With these you can bring a picture down to 1 bit neater...

I am using Photoshop 7 and image size at 16x40 Led and what should be the resolution of it???

 

[koolguy]

That's a lot of leds... 16x32 produces ( well not so good )

View attachment 71427

When it comes to graphical images you have to get a proper imaging tool to get the best results

I need your help again with Photoshop as ghosting image is coming in output how to remove it????

 

[Ian Rogers]

I need your help again with Photoshop as ghosting image is coming in output how to remove it????

I don't know what you mean...

If you mean that when you reduce the colours its a bit smudgy... Or what!

 

[koolguy]

If you mean that when you reduce the colours its a bit smudgy... Or what!

Yes, pls tell steps to do this with Photoshop 7 till array...

 

[Ian Rogers]

Which image do you want me to use.... The scary cat?.... Down to 24x40?

 

[koolguy]

any image ........actually i want example to do this in future...

 

[Ian Rogers]

I quickly made up this...

Tell me if you follow it..

 

[koolguy]

I will try it thanks..
I am working on rows scanning

 

[koolguy]

I quickly made up this...

Tell me if you follow it..

OK, if i want to make image i.e. on led display ..so, how should i connect the led to uC ??
all 8 rows with diff uC and shift register or single one??

 

[Ian Rogers]

I will try it thanks..
I am working on rows scanning

The code I sent you was for column scanning!!!


The PDF is for row scanning...

 

[koolguy]

Hi,

today i have completed new code with row scanning...
now i want to know how to add effect and scrolling in t...
one thing more use of reset in shift register or not because i it with code when new data is sent....

 

[Ian Rogers]

The original tutorial was with row scanning.... But!! As I've said before to scroll left and right its much easier to use column scanning.

What shift register are you using?

 

[koolguy]

The original tutorial was with row scanning.

which one?

What shift register are you using?

I am using 74Hc164....

#include <htc.h>
__CONFIG(LVP_OFF & BOREN_OFF & PWRTE_ON & WDTE_OFF & FOSC_HS);
#define _XTAL_FREQ 20000000


#define DAD PORTB
#define RST RC6
#define CLK RC3
#define DATA RC4
extern const char Font2[];unsigned char leds[32];
unsigned char pow[] = {128,64,32,16,8,4,2,1};
 display(char *str);
int data( int p);

int t;
char b,e;
main (){
TRISC=0B00000000;
TRISB=0B00000000;


while(1){
              display("Ram..");



char u=-1;


b=0b00000001;

for(int r=0;r<8;r++){

DAD=pow[r];
__delay_ms(10);

RST=0;
RST=1;
u++;


for(int a=0;a<32;a++){
DAD=0;
RST=1;
char t,n;
n=leds[a];
n>>=u;

t=(n & b);


DATA=t;
CLK=1;


CLK=0;





}


}
}
}



 display(char *str)   
{

int addr;                                                      
int z;
while(*str!=0){
 addr = ((int)*str++ - 0x20); 
addr *= 5;
int y=0;
for(z=0;z<5;z++){
        leds[z] = Font2[addr+y];
y++;
}

addr = ((int)*str++ - 0x20); 
addr *= 5;
int y=0;
for(z=6;z<11;z++){
leds[z] = Font2[addr+y];
y++;
}
addr = ((int)*str++ - 0x20); 
addr *= 5;
int y=0;
for(z=12;z<17;z++){
leds[z] = Font2[addr+y];
y++;
}
addr = ((int)*str++ - 0x20); 
addr *= 5;
int y=0;
for(z=18;z<23;z++){
leds[z] = Font2[addr+y];
y++;
}
addr = ((int)*str++ - 0x20); 
addr *= 5;
int y=0;
for(z=24;z<29;z++){
leds[z] = Font2[addr+y];
y++;
}


}
}

 

[Ian Rogers]

The one on this web site??? The first one I linked you to.... the simple 8x8 led matrix...

 

[koolguy]

Have seen my code ??
do want to give any suggestion???