Python Serial Inwaiting Example
Python Serial In Raspberry
The serial module is designed as a subset of the PySerial library with some differences due to. For instance, here's an example that will open the 'RS232' port and. With no timeout it will block until the requested number of bytes is read. Raises: SerialTimeoutException – In case a write timeout is configured for the. Example: >>> with serial.serial_for_url(port) as s.
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As part of script development, I have used pyserial module for accessing the DUT. I have started using inWaiting() API for reading the data displayed on DUT. But, during some instances, I have faced the following issue while reading the data.
.inWaiting() is a method that needs to be called to get the value, so res=s.read(s.inWaiting) is incorrect, missing () => res=s.read(s.inWaiting()). In pySerial 3.x there is a new.in_waiting property which is read and not called,.inWaiting() is still available for backwards compatibility. A note to res=s.read(s.inWaiting()): it may still not do what you want. If there are zero bytes ready to read, it will read the empty string.
That's OK, but if you are in a loop trying to read again and again, it will lead to a high CPU load with empty reads. You could instead use res=s.read(s.inWaiting() or 1) which reads as much as possible but at least one byte, where it will block until one is available (and set a timeout, e.g. 3 seconds, to that it still returns from time to time, e.g. To check some application exit flag). .inWaiting() is a method that needs to be called to get the value, so res=s.read(s.inWaiting) is incorrect, missing () => res=s.read(s.inWaiting()).