Hi All,
I have few doubts in the following piece of code from
CC1000RadioIntM.nc. I would be grateful if anybody helps me,
1 task void adjustSquelch() {
2 uint16_t tempArray[CC1K_SquelchTableSize];
3 char i,j,min;
4 uint16_t min_value;
5 uint32_t tempsquelch;
6 atomic {
7 usSquelchTable[usSquelchIndex] = usTempSquelch;
8 usSquelchIndex++;
9 if (usSquelchIndex >= CC1K_SquelchTableSize)
10 usSquelchIndex = 0;
11 if (iSquelchCount <= CC1K_SquelchCount)
12 iSquelchCount++;
13 }
14 for (i=0; i<CC1K_SquelchTableSize; i++) {
15 tempArray[(int)i] = usSquelchTable[(int)i];
16 }
17 min = 0;
18 // for (j = 0; j < ((CC1K_SquelchTableSize) >> 1); j++) {
19 for (j = 0; j < 3; j++) {
20 for (i = 1; i < CC1K_SquelchTableSize; i++) {
21 if ((tempArray[(int)i] != 0xFFFF) &&
22 ((tempArray[(int)i] > tempArray[(int)min]) ||
23 (tempArray[(int)min] == 0xFFFF))) {
24 min = i;
25 }
26 }
27 min_value = tempArray[(int)min];
28 tempArray[(int)min] = 0xFFFF;
29 }
30 tempsquelch = ((uint32_t)(usSquelchVal << 5) +
(uint32_t)(min_value << 1));
31 atomic usSquelchVal = (uint16_t)((tempsquelch / 34) & 0x0FFFF);
The doubts are
- is this the code for noise floor estimation by software AGC (bmac).
- then what is the significance of the number 34 in the last line.
-in the for loop in line no.18 what the value being extracted from the
array, the max value/min value
- where is the part of code where the median of the queue containing
noise values is taken and added to an EWMA with an average decay 0.06
TIA
Jagan
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