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SI4720 Datasheet(PDF) 10 Page - Silicon Laboratories

Part # SI4720
Description  RECEIVE POWER SCAN PRIMER
Download  14 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4720 Datasheet(HTML) 10 Page - Silicon Laboratories

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AN307
10
Rev. 0.2
set spacing 20; #channel spacing
set numBands 5;
# number of bands to find best channel
set filterWidth 5;
# number of channels to average
set numChans [expr ($endFreq - $startFreq) / $spacing]
set chanBand [expr $numChans / $numBands + 1]
set filterMid [expr $filterWidth / 2]; #offset from current freq to middle of filter
set minAvg 100
array set filter {
0 0
1 0
2 0
3 0
4 0
}
array set bandMin {
0 {0 1000}
1 {0 1000}
2 {0 1000}
3 {0 1000}
4 {0 1000}
}
#FIR Filter coefficients
array set coeff {
0 1
1 1
2 2
3 6
4 2
}
set filterWeight 12 ;#Normalization number is 1+1+2+6+2 = 12
#Add an additional 1/2 filter bins to the upper end to make
#averaging easier
for {set i 0} {$i <= $numChans + $filterMid} {incr i 1} {
set currentFreq [expr $startFreq + $i * $spacing]
set freqBand [expr $i / $chanBand]
set filterPtr [expr $i % $filterWidth]
#Handle the top of the band by filling extra array locations with 0
if {$i > $numChans} {
set filter($filterPtr) 0 ;#pack upper 1/2 of filter with 0 at top of band
} else {
txTuneMeasure $currentFreq 0
while {![expr [getIntStatus] & 0x1]} {
after 1
}
array set measure [d::txTuneStatus 1]
set filter($filterPtr) $measure(rnl)
}
#Don't calculate average for lower channels until 1/2 of filter is full
if {$i >= $filterMid} {
set avgFreq [expr ($startFreq + ($i - $filterMid) * $spacing)]
set newAvg 0
set filterWeight 12


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