probleme with mikroc

[RISCIT]

hello guy,


i have a problem with simulation in proteus,

I have designed a little circuit to print some letters on a dot matrix display but it does not want to work anyway. I have tried many modification of my code without success, i have used a code who should be able to work where i ve seen some demo but i dont know why it not working.

All the dot stay on even if i modify the sequency of value, sometimes i display me random lighting dot

I use mikroc and proteus thanks!

here s my code

// Test

const unsigned short lettre[16] = {  0xFF, 0x01, 0xEE, 0xEE, 0xEE, 0x01, 0xFF, 0xFF,   //A
                                     0xFF, 0x00, 0x76, 0x76, 0x76, 0x89, 0xFF, 0xFF   //B
};



unsigned short repeat;
unsigned short num;
unsigned short count;
unsigned short colon;

void main(){

 TRISC=0;
 TRISD=0;
 PORTC=0;
 PORTD=0;

while(1){


for (num = 0; num < 2; num++){

      for(repeat = 0; repeat < 100; repeat++){
          colon = 1;
          for(count= num*8; count < (num*8 + 9); count++){
          PORTD = Lettre[count];
          PORTC = colon;
          delay_ms(1);
          colon = colon << 1;
          
          }
          }
          }
}



}

 

[pinout]

Hi, just a thought, but can you confirm that the LED matrix works in steps with some simple code that sets a column to Vout high and a row to Vout low and check the single correct LED comes on. In my PIC work from a few years back I always fell over with the default to analogue inputs on one of the ports, so check that out as well (although I would expect that to result in LED's OFF!).


Once this works, try another single column and row combination in software, then delve into your proper display software (in this lengthen the delay to try and see what is happening).

 

[jayanth.devarayanadurga]

Have you seen this? http://www.libstock.com/projects/view/672/led-marquee-using-pic16f1847-and-shift-registers

I have not tested it. Attached is an example but it is not displaying 'A' properly.

If count is 1 then

num*8 = 8

num*8 + 9 = 17

count will loop for count = 8 to 16
Letter[count] is valid for Letter[16]?



Edit: Try this rev1 file.

 

[jean12]

What if I want to display two letters like "AB" only those two without scrolling them.

Thanks

 

[jayanth.devarayanadurga]

I will write an example and post soon.

 

[pinout]

As previous post, is your array/loop correct?

for(count= num*8; count < (num*8 + 9); count++)

when num is zero this is for count= 0 while less than 9, so 0 to 8, hence 9 loops...
but not sure why that would cause the symptoms you see?