This module provides functions to wait for events on streams (select streams which are ready for operations).
Polling is an efficient way of waiting for read/write activity on multiple objects. Current objects that support polling are: pyb.UART, pyb.USB_VCP.
pyb.UART
pyb.USB_VCP
Create an instance of the Poll class.
Poll
Wait for activity on a set of objects.
This function is provided for compatibility and is not efficient. Usage of Poll is recommended instead.
Register obj for polling. eventmask is logical OR of:
obj
eventmask
select.POLLIN
select.POLLOUT
select.POLLERR
select.POLLHUP
eventmask defaults to select.POLLIN | select.POLLOUT.
select.POLLIN | select.POLLOUT
Unregister obj from polling.
Modify the eventmask for obj.
Wait for at least one of the registered objects to become ready. Returns list of (obj, event, …) tuples, event element specifies which events happened with a stream and is a combination of select.POLL* constants described above. There may be other elements in tuple, depending on a platform and version, so don’t assume that its size is 2. In case of timeout, an empty list is returned.
event
select.POLL*
Timeout is in milliseconds.