Help to convert common cathod to common anode seven segment display...

[Ian Rogers]

Okay.... If you have wired it the same you will also need to flip port C... But you nee to take care of the two LED's on RC6,7

 

[manoj soorya]

Need to convert Port C also? Not Port B? I can neglect RC6 and RC7.. Its for memory

So, How is possible to change the code?

Can you do it for me?

Thank you

 

[be80be]

Without the schematic it's a shot in the dark. What Ian said should work it's the easy way to do what I was saying but the hardware needs changes to I said that too.

 

[Ian Rogers]

VIBR_RAZRAD 
  BSF  PORTA,5
  BSF  PORTA,4
  MOVF  INDEX,W
  ADDWF  PCL,F
  RETLW  B'01111111'
  RETLW  B'10111111'
  RETLW  B'11011111'
  RETLW  B'11101111'
  RETLW  B'11110111'
  RETLW  B'11111011'
  RETLW  B'11111101'
  RETLW  B'11111110'
  MOVLW  B'11111111'
  BCF  PORTA,4

  RETURN

This is the portion that drives port C... You need to flip the bits..

 

[manoj soorya]

I just flip the code just like this.. Is this Okey?

code (asm):

VIBR_RAZRAD BSF PORTA,5

BSF PORTA,4

MOVF INDEX,W

ADDWF PCL,F

RETLW B'10000000' ;'01111111'

RETLW B'01000000' ;'10111111'

RETLW B'00100000' ;'11011111'

RETLW B'00010000' ;'11101111'

RETLW B'00001000' ;'11110111'

RETLW B'00000100' ;'11111011'

RETLW B'00000010' ;'11111101'

RETLW B'00000001' ;'11111110'

MOVLW B'00000000' ;'11111111'

BCF PORTA,4

RETURN



]

But is not working too... Any other setting need?

 

[manoj soorya]

Only need to flip these bit only? any other changes need? Any hardware change need?

 

[Ian Rogers]

If I get chance tonight, I'll make it work!!

 

[Tony Stewart]

schematic details are missing in the high current digit drivers.

This change from NPN for CC digit to PNP for CA digit must be able to drive the same current as before with same Vce(sat).

Both software and hardware driver logic must be inverted.

 

[manoj soorya]

If I get chance tonight, I'll make it work!!

Thank you very Much for your kind... Thank you.

I am waiting for your kind..

 

[Ian Rogers]

Whooh!! Its hard coded... The code blanks the display every change od digit so 888888 seems to dominate... I'll see if I can sort it!

 

[Tony Stewart]

so the blank (1) has to be inverted too

 

[manoj soorya]

Whooh!! Its hard coded... The code blanks the display every change od digit so 888888 seems to dominate... I'll see if I can sort it!

My hardware is ready to test your code.....

 

[Ian Rogers]

Nearly there... The blanking is fixed to clrf PORTB I have to change it to movlw 255 and movwf PORTB on each digit!

 

[manoj soorya]

Nearly there... The blanking is fixed to clrf PORTB I have to change it to movlw 255 and movwf PORTB on each digit!

Great Job Master

 

[manoj soorya]

Is the coding is complex, Master?

 

[Ian Rogers]

Try this...

 

[manoj soorya]

Waw....... Its working now... Great. But I need to some more bright in the display is good...

Only for hardware change need? Not done in source?

 

[manoj soorya]

I appriciated your hardwork.....Great

 

[manoj soorya]

I just use PNP transistor in the Common Anode pin in the seven segment display.. Now its Okey. But how can I ignore these transistors for reduce the total cost?

It can be controlled through the source code to change the duty cycle of the micro controller?