7 Segment Display

Some time ago while detecting I found the remains of what seems to be an MP3 player and removed the 4 x 7 Segment display that was on the board. I found that this display had a total of 35 LED's in it but only has 7 connection pins. Today I stumbled on this display again and decided to decipher the pin-out, I did not bother to note the Play, Pause, USB, SD FM and MP3 LED's, here is what I found.

what I would like to know is what code dose one need to use to drive the display? could it be binary ? Just to clarify things a bit, (7 segment 1) segment A pin 2 is Neg and pin 1 is Pos and segment F pin 1 is Neg and pin 2 is Pos. By doing it like this they can control all 35 LED's with just 7 connection pins. (very clever indeed)
 

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Xavier

  Yep, my bet is it had a BC code Interpreter IC  .   You can mate it to a EProm and make a cool wild Blinky Light out of it.

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		Quote:			Posted by GoldDigger1950
	Does it have any kind of part number on it at all?

Yes it dose, KM 2408 but there is nothing on the net about it so I think that it was custom made for the manufacturer.

This is the code that controls a single digit, (used in FlowCode) my guess is that if I manipulate this code I'll be able to control it. I just want to let you know that it's purely out of curiosity that I'm looking at how to make this 7 segment work so I'll play around with it for a while, you just never know what may come out of it.

 MX_UINT8 cSegmentValue = %a_SegmentArray[Value % 10];

   if (DecimalPoint)
      cSegmentValue = cSegmentValue & 0x7F;         //Clear decimal point bit

   //display the digit
    #if (%a_COM_TYPE == 1)                  //Common Anode - Low = on, High = off

      if (cSegmentValue & 0x01)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN0);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN0);
      }

      if (cSegmentValue & 0x02)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN1);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN1);
      }

      if (cSegmentValue & 0x04)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN2);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN2);
      }

      if (cSegmentValue & 0x08)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN3);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN3);
      }

      if (cSegmentValue & 0x10)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN4);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN4);
      }

      if (cSegmentValue & 0x20)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN5);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN5);
      }

      if (cSegmentValue & 0x40)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN6);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN6);
      }

      if (cSegmentValue & 0x80)
      {
         FC_CAL_Bit_High_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN7);
      }
      else
      {
         FC_CAL_Bit_Low_DDR(%a_SEG_PORT, %a_SEG_TRIS, %a_SEG_PIN7);
      }

      FC_CAL_Bit_High_DDR(%a_COM_PORT, %a_COM_TRIS, %a_COM_PIN);

#endif

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Xavier

I had a look at the display but it's a 12 pin mine is a 7 pin. I know how to run 12 pin displays and I think that I have figured out how to get this 5 pin running too but like I said it's not a priority for me at this point in time and I just want to understand how to get it to work, so I'll be experimenting on it when time permits. Right now I have a clock that point blank refuses to work with the 16f690 yet works 100% with the 16f877a and that's got me doing some head banging    

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Xavier

I forgot to give you the code to set the ADCON0 register. Use ADCON0=0x00; for hex setup or ADCON0=0b00000000; for binary. I prefer to use binary because you can see on the ADCON0 chart that there are 8 setup bits, all of which can control the port if you set bit 0 to 1. So, if bit 0 is set to 0, the rest of the pins are invalid.

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