Round radio calibration value instead of truncating

The radio calibration function in the bring-up code was truncating the
radio calibration value which caused the resulting frequency to
always measure above the target frequency, instead of trying to get as
close as possible. This change will result in a closer frequency
match, but may sometimes be below the target frequency.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/ao-bringup/turnon_teledongle b/ao-bringup/turnon_teledongle
index 1786f25134b737bcadb7f664d49e7a57648b6ea8..97c1e419b981bc6086a16e5f734914321268b164 100755 (executable)
--- a/ao-bringup/turnon_teledongle
+++ b/ao-bringup/turnon_teledongle
@@ -19,7 +19,7 @@ sleep 5
 echo -n "Generating RF carrier.  Please enter measured frequency: "
 read FREQ
 
-CAL_VALUE=`nickle -e "ceil(434.55 / $FREQ * 1186611)"`
+CAL_VALUE=`nickle -e "floor(434.55 / $FREQ * 1186611 + 0.5)"`
 
 echo "Programming flash with cal value " $CAL_VALUE
 ao-load --cal $CAL_VALUE /usr/share/altos/teledongle-v0.2.ihx $SERIAL