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code:

/* converto da 8 -> 32 bit */
  //dummy=dummy|RX_buffer[3];
  //dummy<<8;
  dummy=(dummy+RX_buffer[3])*256;

  //dummy=dummy|RX_buffer[2];
  //dummy<<8;
  dummy=(dummy+RX_buffer[2])*256;

  //dummy=dummy|RX_buffer[1];
  //dummy<<8;
  dummy=(dummy+RX_buffer[1])*256;
  
  //dummy=dummy|RX_buffer[0];
  dummy=dummy+RX_buffer[0];

  fprintf(stdout, "%x \n", dummy);

 

code:

#include <stdio.h>
unsigned long i=0;
int main(int argc,char *argv[])
{
    i=1;
    printf("%x-->",i);
    i<<8;
    printf("%x",i);
}