Author Topic: Serial Port Bit Banging and Polling  (Read 3518 times)


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Serial Port Bit Banging and Polling
« on: January 17, 2015, 08:38:01 am »
  I have designed a circuit to interface serial port to 8 bit shift register.
  Circuit uses TXD line to produce square wave burst with 10 transitions by transmiting  X'55.
  I have loop back from TXD to CTS line.Idea is to insert data bit after every transition on RTS line.
  I want to poll CTS for Line transition.My question is which Development Software to use which will give me
  fastest polling. So I can figure out what maximum baudrate would be?.Main Idea of circuit is to make it
  Baudrate independent. Any help would be apericiated.



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Re: Serial Port Bit Banging and Polling
« Reply #1 on: January 17, 2015, 11:24:40 am »
For development on the PC side, or for your embedded controller?

I found out (the hard way) that Microsoft only reads bytes in the serial port as 7 bit ASCII last night. Bah.