Hello Jan,

I will corrent the schematic as you indicated.
Below is a c program which will emulate the popular Knight rider (Popular 70's TV) LED's.

Regards,

Charles Bannister

/*         XmasLitsBlink.c http://www.8052.com/forum/read.phtml?id=105529*/
/*         Subject: open project: christmas lightchain */
//         compile SDCC.EXE XmasLitsBlink.c
//         PACKIHX.EXE XmasLitsBlink.ihz > XmasLitsBlink.hex

           #include <AT89X52.H>

//******************Prototype Declaration's*******************
            void delay(unsigned int del_val);
            void shift(unsigned int n);

//******************Definitions*******************************
        #define CLOCK1 P2_7                     // 89C52 pin 27
        #define DOUT P2_6                       // 89C52 pin 26

void main (void)

{
  unsigned char i;                              /* General var */
  unsigned int n;                               /* LED var */
  while (1)  {                                  /* Loop forever */
        n = 0x8000;
        for (i=0; i<15; ++i){
          shift ( n );
          n>>=1;                                // shift right one bit
          delay(100);                           /* delay 100 milliseconds */
        }

        n = 0x0001;                             // Shift left 16 bits delay 100 ms
        for (i=0; i<15; ++i){
          shift ( n );
          n<<=1;                                // shift left one bit
          delay(100);                           /* delay 100 milliseconds */
        }
        }

}
//************************************************************
// shift 16-bit data
//************************************************************

void shift(unsigned int n)
{
        char j;
        for(j=0; j<16; j++)
        {
                DOUT = n&0x8000;                // send data
                CLOCK1 = 1;
                CLOCK1 = 0;
                n<<=1;                          // shift left one bit
        }
}

//************************************************************
//      delay function ie delay(Ms). Based on 11.059200 MHz
//************************************************************
 void delay(unsigned int del_val)
 {
        int i,k;
           for(i=0;i<=del_val;i++)
           for(k=0;k<=111;k++);
 }


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