////////////////////////////////////////////////////////////////////////////
////////// Cycle based timing macros (processor speed independent) /////////
////////////////////////////////////////////////////////////////////////////


/* Delay of exactly 1 Tcy */
#define delay_1tcy() asm("nop")

/* Delay of exactly 2 Tcy */
#define delay_2tcy() asm("nop"); asm("nop")

/* Delay of exactly 4 Tcy */
#define delay_4tcy() delay_2tcy(); delay_2tcy()

/* Delay of exactly 5 Tcy */
#define delay_5tcy() delay_4tcy(); delay_1tcy()

/* Delay of exactly 10 Tcy */
#define delay_10tcy() delay_5tcy(); delay_5tcy()

I have started with these macro definitions. But the problem started to
raise when i want to adopt them for proper functions. That will be a bit
trouble for me. But after completing such work we can be competitor tot he
C18 libraries :)



2006/2/24, Chen Xiao Fan <xiaofan@sg.pepperl-fuchs.com>:
>
>
>
> > -----Original Message-----
> > From: piclist-bounces@mit.edu
> > On Behalf Of G=F6khan SEVER
> > Sent: Friday, February 24, 2006 7:02 AM
> > To: Microcontroller discussion list - Public.
> > Subject: [PIC] accurate delay routines
> >
> > Whereas its PIC18 family compiler it has the delay routines
> > what i'm looking for. The routines are cycle based and the
> > codes are all open for the routines. I started to
> > examine the sources but i realized that they are all ASM based
> > and mostly benefitted of  PIC18 ASM. I dont have much experience
> > with PIC18 assembly so it will be hard for me to adopt them
> > for PIC16 family. Are there any other open-source cycle based
> > delay implementations which will facilitate my coding works?
>
> I look into the delay routine source codes of C18 and they
> are quite simple. You have to learn some assemblies anyway.
>
> Back to PICC, maybe the following example macros can
> serve as a starting point for you.
>
> #define delay_1tcy() asm("\tclrwdt") //(or use nop)
> #define delay_2tcy() asm("\tincf pcl, w")
> #define delay_4tcy() delay_2tcy();delay_2tcy()
> #define delay_5tcy() delay_4tcy();delay_1tcy()
> #define delay_10tcy() delay_4tcy();delay_4tcy();delay_2tcy()
>
> Another thing is to use simulator and that will count the
> total delay time for you.
>
>
> Regards,
> Xiaofan
>
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