Subject:
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bug in setting lnp host address?
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 4 Jun 2002 05:04:44 GMT
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Viewed:
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1997 times
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include/lnp/lnp.h (from the cvs repository)
114: file://! set new LNP host address
115: extern inline void lnp_set_hostaddr(unsigned char host)
116: {
117: lnp_hostaddr = ((host << 4) & CONF_LNP_HOSTMASK);
118: }
Why is host bitshifted by 4? This conflicts with the option of setting the
hostmask in config.h
for example, if someone wanted a hostmask of 11111110 (CONF_LNP_HOSTMASK =
0xFE - 128 hosts, 2 ports), there is no way to use lnp_set_hostaddr to set
almost half of the host addresses, because all the addresses you set will
get bitshifted.
I believe it should be
115: extern inline void lnp_set_hostaddr(unsigned char host)
116: {
117: lnp_hostaddr = host & CONF_LNP_HOSTMASK;
118: }
This means, of course, that you will most likely want to specify host
addresses in hex, and will be somewhat inconvenient.
One option I can think of is just making HOSTMASK 0xF0 as part of LNP. I
think that 16 host addresses should be an adequate number. I am personally
disagreeable with this whole sliding HOSTMASK thing *snarl* =P and would
like to see it set on a single value.
Thoughts?
Albert
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Message has 1 Reply:
 | | Re: bug in setting lnp host address?
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| You are correct in stating that I shouldn't have restricted you to 16 nodes X 16 ports. I did however, want to normalize the host address in the visible API and user interfaces to be a small 0..N number instead of a random hex byte value, properly (...) (22 years ago, 4-Jun-02, to lugnet.robotics.rcx.legos)
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