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Per Westermark
10/31/11 08:54
Read: 459 times
Sweden


 
#184484 - Interpreters have an easier life.
Responding to: Erik Malund's previous message
A BASIC interpreter - or any interpreter - have a quite good control of where time is spent. So it can poll the SPI signals between each interpreted instruction.

And if using a ISR with 1kHz frequency, you can run at way more than 47bps while polling.

The big problem is with a "normal" program that doesn't make use of a timer ISR and does not stop main loop during the communication. It is hard to figure out the slowest execution paths in the program, i.e. the longest interval you might get between two polls. So it is very hard to debug and find problems.

List of 20 messages in thread
TopicAuthorDate
SPI Slave in 89S52      Alexandre Marques      10/30/11 13:35      
   Get real processor      Per Westermark      10/30/11 14:29      
      Topic Author Date      Alexandre Marques      10/30/11 14:46      
         Big problem      Per Westermark      10/30/11 16:01      
         Look for a different model      David Prentice      10/30/11 18:31      
         Try 8051 BASCOM      KONSTANTINOS L. ANGELIS      10/31/11 05:37      
            at what speed      Erik Malund      10/31/11 07:06      
               Interpreters have an easier life.      Per Westermark      10/31/11 08:54      
               Soft SPI speed      KONSTANTINOS L. ANGELIS      10/31/11 09:31      
                  But how to combine that loop with a real program?      Per Westermark      10/31/11 09:44      
                     and more      Erik Malund      10/31/11 09:51      
                        Software master trivial - slave is not      Per Westermark      10/31/11 10:52      
                           SPI analysis is made, results?      KONSTANTINOS L. ANGELIS      10/31/11 14:43      
                              There _may_ be a solution - but maybe not acceptable      Per Westermark      10/31/11 16:05      
                  sure, and so what?      Erik Malund      10/31/11 09:47      
                     SPI at 100Kbps      KONSTANTINOS L. ANGELIS      10/31/11 16:51      
                        Still gives puny transfer rate with significant limitations      Per Westermark      11/01/11 01:05      
                           the answer is      Erik Malund      11/01/11 06:37      
   Fully Interlocked Handshaking.      Michael Karas      11/01/11 08:01      
      Quite common      Per Westermark      11/01/11 08:52      

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