Achilleas A. wrote:

Hi,

it would be very useful to have a

wx sink that displays the value of its input.

This way we can check in real time values

that change slowly (eg, snr, bit error rate, etc.)

Your widh is my command:

Attached is a patch which adds a number_sink_f and number_sink_c to

gr-wxgui.

You must apply it in the root of your gnuradio tree.

patch -p0 <numbersink.patch

You can also find it in gr-wxgui in my work-in-progress development tree

in svn:

gnuradio/branches/developers/nldudok1/general-wip

You use it in the following way:

from gnuradio.wxgui import numbersink

numsink = numbersink.number_sink_f (self, panel,

unit=‘volts’,label=“input level”, avg_alpha=1.0e-5,average=True,

sample_rate=input_rate/sw_decim,

factor=1.0,base_value=0,

minval=-100.0, maxval=100.0,

ref_level=0, decimal_places=5,number_rate=15)

vbox.Add (numsink.win, 1, wx.EXPAND)

self.connect(some_float_source,numsink)

You can set several options by right-mouse-click.

(Show gauge, number of digits, avaraging)

You use it just like an oscope or fft sink.

the parameters:

fg flowgraph, the flowgraph (use self if you work with a

stdgui.gui_flow_graph)

parent wxguipanel, The wxgui parent (use panel if you work with a

stdgui.gui_flow_graph)

unit string, the unit you want to display, for example ‘volt’ or

‘Watt’, free text.

base_value float, an offset which is added to the value

minval float, min value for the gauge

maxval float, max value for the gauge

factor float, scaling factor, value is multiplied by this (sort of

gain)

decimal_places int, the number of decimal places shown

ref_level ignored (API compatibility with scope and fft-sink)

sample_rate float, samplerate of input

number_rate float or int, rate at which values are displayed

(framerate, default is 15)

average bool, use averaging or not

avg_alpha float, average alpha, determines the speed of averaging

label string, the label which goes with this value (for example

‘frequency’ or ‘input power’)

size default=(640,240), the graphical size of this numbersink

peak_hold bool, hold at peak or not.

Unfortunately there is no how_to_write_a_wx_block

so I have no idea how to go about it.

If someone can help me by providing a stripped down

version of one of the wx sinks (*eg, the oscope, or fft)

then I can take a crack at it.

Even better if one can implement this

I hope you like it.

Eric, is this maybe something for trunk.

I don’t know if the code is clean enough.

Greetings,

Martin