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|
id: variable_function_probe
label: Function Probe
flags: [ show_id, python ]
parameters:
- id: block_id
label: Block ID
dtype: name
default: my_block_0
- id: function_name
label: Function Name
dtype: name
default: get_number
- id: function_args
label: Function Args
dtype: raw
hide: ${ ('none' if function_args else 'part') }
- id: poll_rate
label: Poll Rate (Hz)
dtype: real
default: '10'
- id: value
label: Initial Value
dtype: raw
default: '0'
hide: part
value: ${ value }
templates:
imports: |-
import time
import threading
var_make: self.${id} = ${id} = ${value}
make: |+
def _${id}_probe():
while True:
<% obj = 'self' + ('.' + block_id if block_id else '') %>
val = ${obj}.${function_name}(${function_args})
try:
try:
self.doc.add_next_tick_callback(functools.partial(self.set_${id},val))
except AttributeError:
self.set_${id}(val)
except AttributeError:
pass
time.sleep(1.0 / (${poll_rate}))
_${id}_thread = threading.Thread(target=_${id}_probe)
_${id}_thread.daemon = True
_${id}_thread.start()
callbacks:
- self.set_${id}(${value})
documentation: |-
Periodically probe a function and set its value to this variable.
Set the values for block ID, function name, and function args appropriately: Block ID should be the ID of another block in this flow graph. An empty Block ID references the flow graph itself. Function name should be the name of a class method on that block. Function args are the parameters passed into that function. For a function with no arguments, leave function args blank. When passing a string for the function arguments, quote the string literal: '"arg"'.
The values will used literally, and generated into the following form:
self.block_id.function_name(function_args)
or, if the Block ID is empty,
self.function_name(function_args)
To poll a stream for a level, use this with the probe signal block.
file_format: 1
|
