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Kenneth Johansen <kennethj@stud.cs.uit.no> writes:
> hi everybody.
> im currently trying to insert a radio device on my RCX so as to get radio
> communication between my computer
> and my RCX, but im having some trouble.
>
> my electronics guy cant quite get it to work and as such has asked me to display
> all information recieved on the RCX on the
> display.
>
> sooo....i have tried lookin around in the LNP code, but im a bit in the dark
> here.
>
> anyone out there know how to display all overhead code sent with the LNP and not
> just the message it self ?
You should look in the kernel source. In lnp.c there is the
lnp_integrity_byte() function which is called every time a byte is
received. You could modify it to display data as soon as it's received, or
copy it in a buffer for later display.
> as i understand it the code sent using the mindstorm default program will look
> something like this:
> 55 ff 00 f7 08 12 ed 09 f6
>
> but that is not true when using LNP.
If you are interested in the format of LNP packet, here it is.
Integrity packets: F0 xx (xx bytes of data follow) cc
Addressing packets: F1 xx dd ss (xx - 2 bytes of data) cc
The first byte is constant, it identifies the packet type. The second byte
is the length of the following data (not counting the last byte). For
addressing layer packets only follow two bytes, destination and source
addresses. The last byte (`cc' above) is a checksum.
bye
Bernardo
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Message is in Reply To:
 | | legos 0.2.4 and LNP
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| hi everybody. im currently trying to insert a radio device on my RCX so as to get radio communication between my computer and my RCX, but im having some trouble. my electronics guy cant quite get it to work and as such has asked me to display all (...) (24 years ago, 8-Feb-01, to lugnet.robotics.rcx.legos)
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