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???
04/03/07 06:37
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#136467 - No, it doesn't
Responding to: ???'s previous message
Mike Stegmaier said:
After each letter sent, it checks the internal transmit buffer

No, it doesn't.
There is no way to "check the internal transmit buffer".

What it is doing is checking the TI bit, which indicates when the byte has been transmitted.

Failing to clear TI could cause some characters to be missed.

Serial transmission is slow relative to program execution; so, if you don't wait for TI, you will be loading new data into SBUF before transmission of the previous byte has completed - hence the transmission will be corrupted.

List of 72 messages in thread
TopicAuthorDate
Serial Communication Related Problem            01/01/70 00:00      
   partial answers            01/01/70 00:00      
      Oh yeah, i forgot about that            01/01/70 00:00      
   FIRST, THEN, THEN, THEN            01/01/70 00:00      
      A little bit of sarcasm as usual but often helpful            01/01/70 00:00      
         Proper baud rate...            01/01/70 00:00      
            baud rate            01/01/70 00:00      
               calculator            01/01/70 00:00      
            modem is autobauding            01/01/70 00:00      
               Noted            01/01/70 00:00      
   Some answers            01/01/70 00:00      
      Thanks for a patience reply            01/01/70 00:00      
   Nothing to add, but ...            01/01/70 00:00      
      i second(ed) that motion            01/01/70 00:00      
         My location profile?            01/01/70 00:00      
            with this known, it would do no good ...            01/01/70 00:00      
               Radio Shack            01/01/70 00:00      
                  Even so            01/01/70 00:00      
                     I can buy it from the local electronic shop            01/01/70 00:00      
            Sarcasm            01/01/70 00:00      
               I agree            01/01/70 00:00      
      Thanks for understanding and recommendation! - NT            01/01/70 00:00      
      More info            01/01/70 00:00      
         you need to understand the parameters.            01/01/70 00:00      
            "more valid" evidently means invalid            01/01/70 00:00      
            not quite            01/01/70 00:00      
               What a wonderful example that when total crap is s            01/01/70 00:00      
                  lesson            01/01/70 00:00      
            No, it doesn't            01/01/70 00:00      
   TxD pin to TxD pin?            01/01/70 00:00      
      dte-dce-dce-dte            01/01/70 00:00      
         Noted! Thanks!            01/01/70 00:00      
            same request question            01/01/70 00:00      
      Meaning of "Transmit"            01/01/70 00:00      
   same request question 2            01/01/70 00:00      
   Initial command sending code; help me take a look!            01/01/70 00:00      
      Make it simple for yourself            01/01/70 00:00      
         Why the need of circular buffer? Receiving?            01/01/70 00:00      
            polling versus interrupt            01/01/70 00:00      
               Check OK string at RXD or DCD at interupt?            01/01/70 00:00      
                  no good            01/01/70 00:00      
                     Voice mode only! No data communication.            01/01/70 00:00      
                        you are missing the basics            01/01/70 00:00      
                           NO carrier sent after DCD didn't found            01/01/70 00:00      
                              I do not agree            01/01/70 00:00      
                                 Interupt DCD signal for clear transmission            01/01/70 00:00      
                        For Voice Dialling            01/01/70 00:00      
                           and by the way            01/01/70 00:00      
                           Sorry for multiposting            01/01/70 00:00      
                           The ";" works but...            01/01/70 00:00      
                              ";" to return to idle state            01/01/70 00:00      
                              +++ with 3 seconds no modem activity            01/01/70 00:00      
                                 +++ escape sequence            01/01/70 00:00      
                                    Monkey See. Monkey Do.            01/01/70 00:00      
                                       Now monkey also understand?            01/01/70 00:00      
                                 Are you mistaken?            01/01/70 00:00      
                                    I think so            01/01/70 00:00      
            Circular buffers            01/01/70 00:00      
               Initial code for receiving modem response            01/01/70 00:00      
                  don't fiddle with the timer, let it run            01/01/70 00:00      
                     Understood, will run TR1 in global init, thx! - NT            01/01/70 00:00      
                  check this out, Eugene...            01/01/70 00:00      
                     Ah! Didn't know that! Thanks! -NT            01/01/70 00:00      
                     Code; modem commands & responses            01/01/70 00:00      
   V.250 (formerly V.25-ter) - get it free!            01/01/70 00:00      
   code,modem command and response            01/01/70 00:00      
   system froze when connected to hyperterminal            01/01/70 00:00      
      Your code...            01/01/70 00:00      
         It should not be a hardware problem since..            01/01/70 00:00      
            Not necessarily            01/01/70 00:00      
      Just taking a stab at it...            01/01/70 00:00      
         two 'ugly' guesses            01/01/70 00:00      

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