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Andy Neil
01/04/08 07:40
Read: 1045 times
Basingstoke
Uk


 
#149040 - Sure
Responding to: Russ Cooper's previous message
Russ Cooper said:
You could think of it that way. It all boils down to exactly what points in the code you want to define as the official "start" and "end" of the delay.

Sure - but the OP seems to be new to this, so I wanted to be sure that he understands precisely what's going on.

Undoubtedly, the OP is trying to create a delay routin for the bit timing in a bit-banged 1-Wire driver - see: http://www.8052.com/forum/read.phtml?id=149001

In that case, what he needs is the overall delay from the start of the call to the end of the return; eg,
<pre>
// generate a 123us low pulse
set pin low;
delay 123us;
set pin high;
<pre>



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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