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???
12/17/07 13:52
Modified:
  12/17/07 13:55
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 		 #148378 - Serial comm is slow.
Responding to: ???'s previous message
the timing requirements for serial communications when receiving are "very strict". If you do not get a byte read before the next one reaches the stop bit you are lost.

True, but with usual bit rates (let's use 115200 bps), even a 16 MHz 12-clocker has about 115 cycles before that happens. If your other ISR blocks the CPU for 115 cycles, it might just be too long.

I meant "strict" in the sense of "if you don't react within 4 us, bad things happen".

List of 34 messages in thread
TopicAuthorDate
Having problem on using interrupt            01/01/70 00:00      
   Answers            01/01/70 00:00      
      not so fast, Cristoph and to Ragu            01/01/70 00:00      
         Serial comm is slow.            01/01/70 00:00      
            if you read the OP            01/01/70 00:00      
               good interupts            01/01/70 00:00      
                  AAAAAARGH            01/01/70 00:00      
                     not AAAAAAAARGH            01/01/70 00:00      
                        OH YES            01/01/70 00:00      
                           do You ever avoid "non-debuggable"?            01/01/70 00:00      
                              always            01/01/70 00:00      
                                 nice            01/01/70 00:00      
                                    a trick for "long ISRs" better than a RTOS            01/01/70 00:00      
         Buffered RX            01/01/70 00:00      
            not much difference            01/01/70 00:00      
               You are right            01/01/70 00:00      
   Sucess with interrupts            01/01/70 00:00      
      Isn't it too short?            01/01/70 00:00      
         the reason for circular buffers            01/01/70 00:00      
            Worst case, instead of average            01/01/70 00:00      
               absolutely, just worst case is not as bad            01/01/70 00:00      
                  single, double and ring buffer            01/01/70 00:00      
                     single, double and ring buffer app dependent            01/01/70 00:00      
         and some more reasons to use (circular) buffers            01/01/70 00:00      
            buffer overflow error            01/01/70 00:00      
               Buffer overflow handling            01/01/70 00:00      
                  Buffering options            01/01/70 00:00      
                     Beauty contest !            01/01/70 00:00      
                        flexible is the best?            01/01/70 00:00      
                        Simplicity is always better            01/01/70 00:00      
                           simple is another word for            01/01/70 00:00      
                              Where is the borderline to stumble on            01/01/70 00:00      
                                 Copper Oxide            01/01/70 00:00      
               please exclude me from the 'we'            01/01/70 00:00      

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