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???
09/11/07 07:26
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Msg Score: +1
 +1 Good Answer/Helpful		 #144363 - Do you really need it?
Responding to: ???'s previous message
A "full featured" RTOS/multitasking is slightly beyond the scope of '51. I don't say it is out of question, it's just questionable, if it's worth doing it on a '51. If you feel your application needs multitasking, you should most probably switch to a "more adult" microprocessor/microcontroller family.

However, many small embedded applications can be accomplished using simpler tools with similar results. Besides considering extensive use of interrupts (for which a microcontroller such as the '51 is very well equipped), you can also consider using a simple task scheduler - some hints in this respect from Ian Bell are here.

JW


List of 44 messages in thread
TopicAuthorDate
ABOUT THE REAL TIME OS            01/01/70 00:00      
   Do you really need it?            01/01/70 00:00      
      Seconds thoughts            01/01/70 00:00      
         but it's a 51 on steroids!... and some philosophy            01/01/70 00:00      
            Definitions            01/01/70 00:00      
               I use the p89c51rd2            01/01/70 00:00      
               It is the architecture            01/01/70 00:00      
                  Mutlitasking on the OS            01/01/70 00:00      
                     I think I said something similar...            01/01/70 00:00      
                     please tell which            01/01/70 00:00      
                        extended stack in SRAM            01/01/70 00:00      
                           Stack expanded to MOVX            01/01/70 00:00      
                  another architecture shortcoming            01/01/70 00:00      
                     Independent of multitasking?            01/01/70 00:00      
                        HUH??            01/01/70 00:00      
                           Clarification            01/01/70 00:00      
                              Identity crisis            01/01/70 00:00      
                                 Oops            01/01/70 00:00      
                                 No crisis here            01/01/70 00:00      
                           My question clarified            01/01/70 00:00      
                              "stack inefficiency"            01/01/70 00:00      
                                 Stack            01/01/70 00:00      
               I disagree somewhat            01/01/70 00:00      
                  Multitasking            01/01/70 00:00      
   I think I need it!            01/01/70 00:00      
      no, you do not            01/01/70 00:00      
         I have made a PLC complier for MCS-51 by VB.            01/01/70 00:00      
            Multi-use timers            01/01/70 00:00      
               Could you help me?            01/01/70 00:00      
                  No            01/01/70 00:00      
                  Software timers            01/01/70 00:00      
                     Linked Lists            01/01/70 00:00      
                     Linked Lists for Software Timers            01/01/70 00:00      
               I do not know how to do?            01/01/70 00:00      
                  Use software timers            01/01/70 00:00      
                     how to use it point to task.            01/01/70 00:00      
                        what is "a task" in your application?            01/01/70 00:00      
                        What task??            01/01/70 00:00      
                  stop running            01/01/70 00:00      
      Unlilely            01/01/70 00:00      
   DS89C450 can handle the RTOS?            01/01/70 00:00      
      PLCs            01/01/70 00:00      
         Russell got it            01/01/70 00:00      
         Thanks russell!            01/01/70 00:00      

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