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Andy Neil
01/04/08 03:07
Read: 1656 times
Basingstoke
Uk


 
#149031 - Delay functions
Responding to: Jae-yong Kim's previous message
You might want to give your delay function a more meaningful name that makes the units of the parameter obvious; eg,
void Wait_1us ( Uint8 n );  // Wait n+2 us
void Wait_10us( Uint8 n );  // Wait 10n us
... or whatever.

When I did this, for Wait_1us, I couldn't get over the 2us "overhead" in the call, so I created a macro WAIT_1US to handle the offset:
#define WAIT_1US( us ) Wait_1us( us-2 )
With Wait_10us, there was plenty of slack to take up to allow for the overhead...

See: http://www.keil.com/forum/docs/thread2938.asp

List of 27 messages in thread
TopicAuthorDate
Number of CPU cycle for 8051 function call      Jae-yong Kim      01/04/08 01:03      
   Do it in assembler      Andy Neil      01/04/08 03:00      
   Delay functions      Andy Neil      01/04/08 03:07      
   A related trick        Russ Cooper      01/04/08 05:56      
      Offset      Andy Neil      01/04/08 07:03      
         Offset      Russ Cooper      01/04/08 07:23      
            Sure      Andy Neil      01/04/08 07:40      
               Over Drive?      Neil Kurzman      01/04/08 10:20      
      a refinement      Erik Malund      01/04/08 07:58      
      NOPs are so bad waste of space...      Jan Waclawek      01/04/08 08:51      
         waste of space... waste of time      Erik Malund      01/04/08 09:24      
            fixed delay      Jan Waclawek      01/04/08 09:54      
               Variable delay      Russ Cooper      01/04/08 11:04      
                  determinism of the cache      Jan Waclawek      01/04/08 11:36      
               there are no cache misses in 'linear code'      Erik Malund      01/04/08 11:16      
                  I got only ONE cache miss...      Jan Waclawek      01/04/08 11:39      
      Old Keil Thread      Jon Ward      01/06/08 18:29      
   What about a Delay like this.      Jerry Black      01/07/08 05:31      
      No, it won't.        Christoph Franck      01/07/08 05:55      
         Ok.      Jerry Black      01/07/08 07:08      
         also      Erik Malund      01/08/08 06:47      
      Also ...      Christoph Franck      01/08/08 07:01      
         Actually...      Brett Wallace      01/08/08 08:02      
            will.      Jerry Black      01/08/08 08:21      
               ANSI C      Maarten Brock      01/10/08 05:58      
                  Keil option: Disable ANSI casts      Andy Neil      01/10/08 07:08      
         typo.      Jerry Black      01/08/08 08:24      

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