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???
08/03/11 14:02
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 		 #183179 - Separate the characters and look with scope
Responding to: ???'s previous message
I just took a quick peek at your code, but didn't see any extra delay between each character.

It is always a good idea to have some extra separation between each character transmitted, in case the receiver would get out of sync and start to pick up data bits as start bits. Especially when you are trying to debug the code.

The next thing is that with a good separation between each transmitted character, it will be easy to use a digital oscilloscope to look at your signals and compare with the expected results.

List of 30 messages in thread
TopicAuthorDate
bit banging program touble            01/01/70 00:00      
   why?            01/01/70 00:00      
      i need a second serial port            01/01/70 00:00      
         something like this , without any warranty :            01/01/70 00:00      
         a good start would be ...            01/01/70 00:00      
            only 3 'U's are commingout of 100            01/01/70 00:00      
               Separate the characters and look with scope            01/01/70 00:00      
                  finally it worked            01/01/70 00:00      
                     uart receiver in software            01/01/70 00:00      
   No I/O or No Timing            01/01/70 00:00      
      "No I/O or No Timing"            01/01/70 00:00      
   Someday you will learn...            01/01/70 00:00      
      this isnt the actual code            01/01/70 00:00      
         Well then another lesson to learn...            01/01/70 00:00      
   Assembler Manual will help you            01/01/70 00:00      
      assembler manual?            01/01/70 00:00      
   Data is 8 Bit??            01/01/70 00:00      
   Bit width timing and timer TH0,TL0 Values            01/01/70 00:00      
      checked values for TH0 and TL0            01/01/70 00:00      
         keil baud rate Calculator not for bit bang            01/01/70 00:00      
   LSB first            01/01/70 00:00      
   now reception....            01/01/70 00:00      
      1) din = din >> 1            01/01/70 00:00      
         working at 1200 baud            01/01/70 00:00      
            delayRS()            01/01/70 00:00      
               why do i have to sample stop bit            01/01/70 00:00      
                  Need not, but should            01/01/70 00:00      
                  because            01/01/70 00:00      
                     Much to a real UART            01/01/70 00:00      
                  1.5 bit delay            01/01/70 00:00      

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