Re: [Discuss-gnuradio] Question on PMT boolean messages
Excellent! So glad you got it working, Ali, and thanks for sharing the
solution to your issue!
Cheers,
Ben
On Wed, May 1, 2019 at 3:45 PM Ali Dormiani wrote:
> I figured this out today. I used a handle_msg and simply connected a
> message strobe to the 'junk' msg input. My custom block works as expected
> now.
>
> On Tue, Apr 30, 2019 at 12:56 PM Ali Dormiani
> wrote:
>
>> Hello,
>>
>> Thank you for the advice. I went back to the tutorials and now I have a
>> better grasp of what is going on.
>>
>> Regarding 'work' vs 'handle_msg', which situations fit each of these?
>>
>> Is 'handle_msg' supposed to be for passing messages through multiple
>> internal msg ports?
>>
>> Is 'work' for dealing with streams or can I do message related things in
>> 'work'?
>>
>> It appears that handle_msg is for passing from inputs to outputs (which I
>> do not need as I want a block with only a message out).
>>
>>
>> In short, if one wants to make a block with a single msg output and
>> nothing else, should s/he use a message handler (and leave work empty with
>> a pass) or use work? If so, what should work return, given there are no
>> data-streams involved?
>>
>> Thank you for your time,
>>
>> Ali
>>
>> On Mon, Apr 29, 2019 at 2:49 PM Marcus Müller
>> wrote:
>>
>>> Hi Ali,
>>> causality, our old foe, strikes again!
>>>
>>> You're trying to emit a message in the constructor. Messages will be
>>> delivered to all message acceptors connected to that message port.
>>> However, you can't possibly connect the block before the block-holding
>>> object exists, i.e. before the constructor returns.
>>>
>>> So, necessarily, the messages are sent before anything is connected to
>>> the msg_out port, and thus into the void and simply get dropped by the
>>> scheduler.
>>>
>>> Best regards,
>>> Marcus
>>>
>>> PS: I'd strongly recommend having a `self.port = pmt.intern('msg_out')`
>>> in the constructor and using that whenever you need the port if you're
>>> doing that within the work() function often. Constructing PMT interns
>>> is relatively expensive.
>>>
>>> On Mon, 2019-04-29 at 14:39 -0700, Ali Dormiani wrote:
>>> > Hello everyone,
>>> >
>>> > I have been attempting to make my own block that sends out a boolean
>>> > message if certain time related conditions are met.
>>> >
>>> > I am unable to figure out why my block does not work. This seems to
>>> > be the line of interest:
>>> >
>>> > self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_T)
>>> >
>>> > This line should cause the block to output a PMT true through port
>>> > msg_out right?
>>> >
>>> > My full block is attached bellow. Any help would be greatly
>>> > appreciated.
>>> >
>>> > Thank you all for your time,
>>> >
>>> > Ali
>>> >
>>> > ==
>>> > import numpy as np
>>> > from gnuradio import gr
>>> > import pmt
>>> > import datetime
>>> >
>>> > class msg_block(gr.basic_block): # other base classes are
>>> > basic_block, decim_block, interp_block
>>> > """This block checks time and sends true or false if capture
>>> > period is desired"""
>>> >
>>> > def __init__(self, minutes=15, seconds=10): # only default
>>> > arguments here
>>> > """arguments to this function show up as parameters in GRC"""
>>> > gr.basic_block.__init__(
>>> > self,
>>> > name='Time Enable', # will show up in GRC
>>> > in_sig=None,
>>> > out_sig=None
>>> > )
>>> > self.message_port_register_out(pmt.intern('msg_out'))
>>> > now = datetime.datetime.now()
>>> > #P_true = pmt.PMT_T
>>> > #P_false = pmt.PMT_F
>>> > if ((now.minute % minutes) == 0): #check if minute is ok
>>> > if (now.second < seconds): #check if capture period is ok
>>> > self.message_port_pub(pmt.intern('msg_out'),
>>> > pmt.PMT_T)
>>> > else:
>>> > self.message_port_pub(pmt.intern('msg_out'),
>>> > pmt.PMT_F)
>>> > else:
>>> > self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_F)
>>> >
>>> > def work(self, input_items, output_items):
>>> > pass
>>> > =
>>> > ___
>>> > Discuss-gnuradio mailing list
>>> > Discuss-gnuradio@gnu.org
>>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>
>>> ___
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Re: [Discuss-gnuradio] Question on PMT boolean messages
I figured this out today. I used a handle_msg and simply connected a
message strobe to the 'junk' msg input. My custom block works as expected
now.
On Tue, Apr 30, 2019 at 12:56 PM Ali Dormiani wrote:
> Hello,
>
> Thank you for the advice. I went back to the tutorials and now I have a
> better grasp of what is going on.
>
> Regarding 'work' vs 'handle_msg', which situations fit each of these?
>
> Is 'handle_msg' supposed to be for passing messages through multiple
> internal msg ports?
>
> Is 'work' for dealing with streams or can I do message related things in
> 'work'?
>
> It appears that handle_msg is for passing from inputs to outputs (which I
> do not need as I want a block with only a message out).
>
>
> In short, if one wants to make a block with a single msg output and
> nothing else, should s/he use a message handler (and leave work empty with
> a pass) or use work? If so, what should work return, given there are no
> data-streams involved?
>
> Thank you for your time,
>
> Ali
>
> On Mon, Apr 29, 2019 at 2:49 PM Marcus Müller
> wrote:
>
>> Hi Ali,
>> causality, our old foe, strikes again!
>>
>> You're trying to emit a message in the constructor. Messages will be
>> delivered to all message acceptors connected to that message port.
>> However, you can't possibly connect the block before the block-holding
>> object exists, i.e. before the constructor returns.
>>
>> So, necessarily, the messages are sent before anything is connected to
>> the msg_out port, and thus into the void and simply get dropped by the
>> scheduler.
>>
>> Best regards,
>> Marcus
>>
>> PS: I'd strongly recommend having a `self.port = pmt.intern('msg_out')`
>> in the constructor and using that whenever you need the port if you're
>> doing that within the work() function often. Constructing PMT interns
>> is relatively expensive.
>>
>> On Mon, 2019-04-29 at 14:39 -0700, Ali Dormiani wrote:
>> > Hello everyone,
>> >
>> > I have been attempting to make my own block that sends out a boolean
>> > message if certain time related conditions are met.
>> >
>> > I am unable to figure out why my block does not work. This seems to
>> > be the line of interest:
>> >
>> > self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_T)
>> >
>> > This line should cause the block to output a PMT true through port
>> > msg_out right?
>> >
>> > My full block is attached bellow. Any help would be greatly
>> > appreciated.
>> >
>> > Thank you all for your time,
>> >
>> > Ali
>> >
>> > ==
>> > import numpy as np
>> > from gnuradio import gr
>> > import pmt
>> > import datetime
>> >
>> > class msg_block(gr.basic_block): # other base classes are
>> > basic_block, decim_block, interp_block
>> > """This block checks time and sends true or false if capture
>> > period is desired"""
>> >
>> > def __init__(self, minutes=15, seconds=10): # only default
>> > arguments here
>> > """arguments to this function show up as parameters in GRC"""
>> > gr.basic_block.__init__(
>> > self,
>> > name='Time Enable', # will show up in GRC
>> > in_sig=None,
>> > out_sig=None
>> > )
>> > self.message_port_register_out(pmt.intern('msg_out'))
>> > now = datetime.datetime.now()
>> > #P_true = pmt.PMT_T
>> > #P_false = pmt.PMT_F
>> > if ((now.minute % minutes) == 0): #check if minute is ok
>> > if (now.second < seconds): #check if capture period is ok
>> > self.message_port_pub(pmt.intern('msg_out'),
>> > pmt.PMT_T)
>> > else:
>> > self.message_port_pub(pmt.intern('msg_out'),
>> > pmt.PMT_F)
>> > else:
>> > self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_F)
>> >
>> > def work(self, input_items, output_items):
>> > pass
>> > =
>> > ___
>> > Discuss-gnuradio mailing list
>> > Discuss-gnuradio@gnu.org
>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>>
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Re: [Discuss-gnuradio] Question on PMT boolean messages
Hello,
Thank you for the advice. I went back to the tutorials and now I have a
better grasp of what is going on.
Regarding 'work' vs 'handle_msg', which situations fit each of these?
Is 'handle_msg' supposed to be for passing messages through multiple
internal msg ports?
Is 'work' for dealing with streams or can I do message related things in
'work'?
It appears that handle_msg is for passing from inputs to outputs (which I
do not need as I want a block with only a message out).
In short, if one wants to make a block with a single msg output and nothing
else, should s/he use a message handler (and leave work empty with a pass)
or use work? If so, what should work return, given there are no
data-streams involved?
Thank you for your time,
Ali
On Mon, Apr 29, 2019 at 2:49 PM Marcus Müller wrote:
> Hi Ali,
> causality, our old foe, strikes again!
>
> You're trying to emit a message in the constructor. Messages will be
> delivered to all message acceptors connected to that message port.
> However, you can't possibly connect the block before the block-holding
> object exists, i.e. before the constructor returns.
>
> So, necessarily, the messages are sent before anything is connected to
> the msg_out port, and thus into the void and simply get dropped by the
> scheduler.
>
> Best regards,
> Marcus
>
> PS: I'd strongly recommend having a `self.port = pmt.intern('msg_out')`
> in the constructor and using that whenever you need the port if you're
> doing that within the work() function often. Constructing PMT interns
> is relatively expensive.
>
> On Mon, 2019-04-29 at 14:39 -0700, Ali Dormiani wrote:
> > Hello everyone,
> >
> > I have been attempting to make my own block that sends out a boolean
> > message if certain time related conditions are met.
> >
> > I am unable to figure out why my block does not work. This seems to
> > be the line of interest:
> >
> > self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_T)
> >
> > This line should cause the block to output a PMT true through port
> > msg_out right?
> >
> > My full block is attached bellow. Any help would be greatly
> > appreciated.
> >
> > Thank you all for your time,
> >
> > Ali
> >
> > ==
> > import numpy as np
> > from gnuradio import gr
> > import pmt
> > import datetime
> >
> > class msg_block(gr.basic_block): # other base classes are
> > basic_block, decim_block, interp_block
> > """This block checks time and sends true or false if capture
> > period is desired"""
> >
> > def __init__(self, minutes=15, seconds=10): # only default
> > arguments here
> > """arguments to this function show up as parameters in GRC"""
> > gr.basic_block.__init__(
> > self,
> > name='Time Enable', # will show up in GRC
> > in_sig=None,
> > out_sig=None
> > )
> > self.message_port_register_out(pmt.intern('msg_out'))
> > now = datetime.datetime.now()
> > #P_true = pmt.PMT_T
> > #P_false = pmt.PMT_F
> > if ((now.minute % minutes) == 0): #check if minute is ok
> > if (now.second < seconds): #check if capture period is ok
> > self.message_port_pub(pmt.intern('msg_out'),
> > pmt.PMT_T)
> > else:
> > self.message_port_pub(pmt.intern('msg_out'),
> > pmt.PMT_F)
> > else:
> > self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_F)
> >
> > def work(self, input_items, output_items):
> > pass
> > =
> > ___
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
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Re: [Discuss-gnuradio] Question on PMT boolean messages
Hi Ali,
causality, our old foe, strikes again!
You're trying to emit a message in the constructor. Messages will be
delivered to all message acceptors connected to that message port.
However, you can't possibly connect the block before the block-holding
object exists, i.e. before the constructor returns.
So, necessarily, the messages are sent before anything is connected to
the msg_out port, and thus into the void and simply get dropped by the
scheduler.
Best regards,
Marcus
PS: I'd strongly recommend having a `self.port = pmt.intern('msg_out')`
in the constructor and using that whenever you need the port if you're
doing that within the work() function often. Constructing PMT interns
is relatively expensive.
On Mon, 2019-04-29 at 14:39 -0700, Ali Dormiani wrote:
> Hello everyone,
>
> I have been attempting to make my own block that sends out a boolean
> message if certain time related conditions are met.
>
> I am unable to figure out why my block does not work. This seems to
> be the line of interest:
>
> self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_T)
>
> This line should cause the block to output a PMT true through port
> msg_out right?
>
> My full block is attached bellow. Any help would be greatly
> appreciated.
>
> Thank you all for your time,
>
> Ali
>
> ==
> import numpy as np
> from gnuradio import gr
> import pmt
> import datetime
>
> class msg_block(gr.basic_block): # other base classes are
> basic_block, decim_block, interp_block
> """This block checks time and sends true or false if capture
> period is desired"""
>
> def __init__(self, minutes=15, seconds=10): # only default
> arguments here
> """arguments to this function show up as parameters in GRC"""
> gr.basic_block.__init__(
> self,
> name='Time Enable', # will show up in GRC
> in_sig=None,
> out_sig=None
> )
> self.message_port_register_out(pmt.intern('msg_out'))
> now = datetime.datetime.now()
> #P_true = pmt.PMT_T
> #P_false = pmt.PMT_F
> if ((now.minute % minutes) == 0): #check if minute is ok
> if (now.second < seconds): #check if capture period is ok
> self.message_port_pub(pmt.intern('msg_out'),
> pmt.PMT_T)
> else:
> self.message_port_pub(pmt.intern('msg_out'),
> pmt.PMT_F)
> else:
> self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_F)
>
> def work(self, input_items, output_items):
> pass
> =
> ___
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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[Discuss-gnuradio] Question on PMT boolean messages
Hello everyone,
I have been attempting to make my own block that sends out a boolean
message if certain time related conditions are met.
I am unable to figure out why my block does not work. This seems to be the
line of interest:
*self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_T)*
This line should cause the block to output a PMT true through port msg_out
right?
My full block is attached bellow. Any help would be greatly appreciated.
Thank you all for your time,
Ali
==
import numpy as np
from gnuradio import gr
import pmt
import datetime
class msg_block(gr.basic_block): # other base classes are basic_block,
decim_block, interp_block
"""This block checks time and sends true or false if capture period is
desired"""
def __init__(self, minutes=15, seconds=10): # only default arguments
here
"""arguments to this function show up as parameters in GRC"""
gr.basic_block.__init__(
self,
name='Time Enable', # will show up in GRC
in_sig=None,
out_sig=None
)
self.message_port_register_out(pmt.intern('msg_out'))
now = datetime.datetime.now()
#P_true = pmt.PMT_T
#P_false = pmt.PMT_F
if ((now.minute % minutes) == 0): #check if minute is ok
if (now.second < seconds): #check if capture period is ok
self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_T)
else:
self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_F)
else:
self.message_port_pub(pmt.intern('msg_out'), pmt.PMT_F)
def work(self, input_items, output_items):
pass
=
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