Subject:
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Re: kernel hacking in lnp.c (problem)
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Thu, 1 Mar 2001 21:54:30 GMT
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Viewed:
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1588 times
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In lugnet.robotics.rcx.legos, Bernardo Dal Seno writes:
> Kenneth Johansen <kennethj@stud.cs.uit.no> writes:
>
>
> > in /kernel/lnp.c
> > there is a function called lnp_receive_packet.
> > here im trying to insert a function that will display whatever came in
> > the data field when lnp_receive_packet was called.
> > (interested in seeing everything, including headers,etc)
> > i have made it so that it will only display the data when i press the
> > view button.
> >
> > anyways it compiles fine and i get it to download to the RCX, but when i
> > try to download another "user" program to the rcx
> > i always get "error deleting program"
> >
> > so.heh...i guess im missing something pretty obvous here, but i cant
> > seem to figgure it out.
>
> Posting your code would help a lot :-). lnp_receive_packet() is called
> after the integrity layer has verified the checksum from an interrupt
> handler. So your code should be short e never call functions that wait or
> may cause a task switch. dll uses LNP to download programs, and when it
> doesn't get reply from RCX it complaines with the "error deteleting
> program".
>
> Probably your code doesn't allow data to pass to higher levels of LNP
> (that's what my crystal ball says, sometimes it's right :-).
The best way to do this kind of thing is to save the info you want to display
in a variable or something, set a flag saying somethings there, and let another
task display the data & reset the flag.
You can see a simple implementation of this in remote.c, included in the remote
patch on sourceforge.
ROSCO
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Message is in Reply To:
 | | Re: kernel hacking in lnp.c (problem)
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| (...) Posting your code would help a lot :-). lnp_receive_packet() is called after the integrity layer has verified the checksum from an interrupt handler. So your code should be short e never call functions that wait or may cause a task switch. dll (...) (24 years ago, 1-Mar-01, to lugnet.robotics.rcx.legos)
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