Date: Wed, 20 Feb 2008 12:30:52 -0500 From: "Barbieri, Paul (US SSA)" <paul.barbieri@baesystems.com> To: <freebsd-net@freebsd.org> Subject: ieee80211 ms and tu convert macros Message-ID: <8DD841934E0E96429CC4470C23528CA10260B9CB@GLDMS00013.goldlnk.rootlnka.net>
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I happened to be looking in net80211/ieee80211_var.h and examined the
macros IEEE80211_MS_TO_TU and IEEE80211_TU_TO_MS. The conversions seem
backward to me. The macros are:
#define IEEE80211_MS_TO_TU(x) (((x) * 1000) / 1024)
#define IEEE80211_TU_TO_MS(x) (((x) * 1024) / 1000)
If I take the values:
1 second = 1000 milliseconds (ms) = 1024 timer units (tu)
When I convert 1000 ms, I should get 1024 tu but when I use the macro
IEEE80211_MS_TO_TU(1000), I get 976. The current definition yields (1000
* 1000) / 1024 = 976.
The macro should be:
#define IEEE80211_MS_TO_TU(x) (((x) * 1024) / 1000)
This yields IEEE80211_MS_TO_TU(1000) = (1000 * 1024) / 1000 = 1024
The other macro needs a similar change.
Am I missing something, interpreting something incorrectly? Please let
me know.
Paul
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