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Hello to all,

I have been trying to use a TI  TPIC6B595 power shift register without
success.  I have attatched the C source code that I wrote to see what I am
overlooking.  In writing the code I used the data sheet along with an App.
note showing the control pin waveforms to transfer data.  I know that it
must be something simple but I can't find it.  The code is for CCS.


Thanks for your help
Rod

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        filename="tryshift.c"



#include <16f73.h>
#fuses xt,nowdt,noprotect
#byte   porta =3D 5
#byte   portb =3D 6
#byte   portc =3D 7
//-----------------------------------------------------------------------=
-----------------------

#use standard_io(a)
#use standard_io(b)
#use standard_io(c)
#use delay(clock=3D4000000)

//-----------------------------------------------------------------------=
-----------------------
#define DATA_LINE PIN_C0//   Pin # 3 on TPIC6B595
#define SRCK  PIN_C1//       Pin # 13
#define RCK  PIN_C2//        Pin # 12
#define G_BAR  PIN_C3//      Pin # 9
#define SRCLR_BAR PIN_C4//   Pin # 8


void set_up();
void write_byte();



byte ser_in =3D 0;

main()
    {
      set_up();
     do
       {=20
         ser_in =3D 0x55;
         write_byte();
         delay_us(200);// 5khz refresh rate=20
       }
      while(1);
    }

write_byte()
    {
      byte counter,write_value[1] =3D 0;
      write_value[0] =3D ser_in;
      output_low(G_BAR);
      output_low(data_line);
      output_low(SRCLR_BAR);// clear input shift register
      output_high(SRCLR_BAR);
     =20
      for(counter=3D1;counter<=3D8;++counter)
        {
          if(shift_left(write_value,1,0))// Shift in MSB first
            {
              output_high(data_line);
            }
          else
            {
              output_low(data_line);
            }
          delay_cycles(1);
          output_high(SRCK);// shift bit into shift register
          delay_cycles(1);
          output_low(SRCK);=20
        }
      output_high(RCK);// xfer shift register outputs to storage =
register
      delay_cycles(1);
      output_low(RCK);
         =20
    }

set_up()
    {
      set_tris_c(0x00);
      output_low(G_BAR);
      output_high(SRCLR_BAR);
      output_low(data_line);
    =20
    }=20

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