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baudrate Vs. sample frequence

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ubuntu_amateur

ubuntu_amateur

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If the serial port is used to detect and sample a 2KHz signal,
how many baudrate should be set?
why the serial port catch no data?
 

Please explain with more detail what you are attempting to do.

The standard RS-232 serial port on a PC computer cannot sample the receive-data input at a steady rate. Remember that the UART waits for a start bit and then samples several data bits, then it waits for another start bit, ...
 

the signal is square wave, it is not at steady frequence.
you can regard it as a demoludated signal from FSK.

Are you sure that it can't receive any data?
 

You will get data, but it won't be very useful. The UART stops sampling after each received data byte, and then waits for the next start bit. The UART doesn't tell you how long it waited. You will get 8 uniform samples, unknown delay, 8 uniform samples, unknown delay, etc. Those unknown delays will cause trouble when you try to estimate the signal frequency.
 

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