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Added CTCSS decoder in NFM RX

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RSSI output is now pitch instead of PWM
Disabled RSSI output in WBFM mode
This commit is contained in:
furrtek 2017-11-28 08:52:04 +01:00
parent f128b9b0b7
commit d77337dd77
19 changed files with 284 additions and 160 deletions
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20
firmware/tools/fir_lpf.py Normal file
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import math
m = 64 - 1
ft = 300.0 / 24000.0
taps = []
window = []
print("Normalized ft = " + str(ft))
for n in range(0, 64):
taps.append(math.sin(2 * math.pi * ft * (n - (m / 2.0))) / (math.pi * (n - (m / 2.0))))
for n in range(0, 64):
window.append(0.5 - 0.5 * math.cos(2 * math.pi * n / m))
for n in range(0, 64):
taps[n] = int(taps[n] * window[n] * 32768)
print(taps)