c code for led dotmatrix

do {
 for (k=0; k<StringLength+4; k++){
  for (scroll=0; scroll<(8/shift_step); scroll++) {
   for (row=0; row<8; row++){
     if(UserIP == 1) index = message[k];
     else index = default_message[k];
     temp = CharData[index-32][row];
     Buffer[row][4] = (Buffer[row][4] << Shift_Step) | (Buffer[row][3] >> (8-Shift_Step));
     Buffer[row][3] = (Buffer[row][3] << Shift_Step) | (Buffer[row][2] >> (8-Shift_Step));
     Buffer[row][2] = (Buffer[row][2] << Shift_Step) | (Buffer[row][1] >> (8-Shift_Step));
     Buffer[row][1] = (Buffer[row][1] << Shift_Step) | (Buffer[row][0] >> (8-Shift_Step));
     Buffer[row][0] = (Buffer[row][0] << Shift_Step)| (temp >> ((8-shift_step)-scroll*shift_step));
   }
   speed = 15;
   for(l=0; l<speed;l++){
     m = 1;
     for (i=0; i<8; i++) {
       Send_Data(i);
       LATB = m;
       m = m << 1;
       Delay_us(1000);
     }  // i
   } // l
  } // scroll
 } // k