creating delay

for(i=0; i<=15; i++){
//do nothing
}

How many processor cycles is this delay?
Is there a more efficient way to create a delay in my embedded system?

2) I want a delay of 1000 ns. My processor runs at 12Mhz.
How many steps sould i create in the for loop?

im pretty sure there is a way

#include <windows.h>
sleep(/*number of ms*/);

if that doesnt work try looking for it(the sleep thing) on msdn

>How many processor cycles is this delay?
It will depend on what i is. Take a look at the generated assembly. For example, this is what I get with an int i.

Code:

---

stmt level    source

  1          void main(void)
  2          {
  3  1          int i;
  4  1          for(i = 0; i < 16; ++i)
  5  1          {
  6  2          }
  7  1      }

            ; FUNCTION main (BEGIN)
                                          ; SOURCE LINE # 1
                                          ; SOURCE LINE # 2
                                          ; SOURCE LINE # 4
;---- Variable 'i' assigned to Register 'R6/R7' ----
0000 E4            CLR    A
0001 FF            MOV    R7,A
0002 FE            MOV    R6,A
0003        ?C0001:
                                          ; SOURCE LINE # 5
                                          ; SOURCE LINE # 6
0003 0F            INC    R7
0004 BF0001        CJNE    R7,#00H,?C0005
0007 0E            INC    R6
0008        ?C0005:
0008 EF            MOV    A,R7
0009 6410          XRL    A,#010H
000B 4E            ORL    A,R6
000C 70F5          JNZ    ?C0001
                                          ; SOURCE LINE # 7
000E        ?C0004:
000E 22            RET   
            ; FUNCTION main (END)

---

Now comes the fun of looking up the instruction cycle times.

>Is there a more efficient way to create a delay in my embedded system?
Timer interrupts come to mind. You might find some useful information here.