fix typo

programs/dmatest_v2.py

@@ -62,6 +62,7 @@ SAMPLING_RATE_HZ = 22000
 SAMPLING_FREQ_TO_HIGH = -2
 SAMPLING_FREQ_TO_LOW = -1
 
+
 class AdcDevice:
     def __init__(self, device_nr, rate=SAMPLING_RATE_HZ, samples=SAMPLES):
         self.__lock = asyncio.Lock()
@@ -199,7 +200,7 @@ def calculate_frequency(voltages_centered, sampling_rate):
     count_mean = sum(counts) / len(counts)
     if count_mean < 5:
         return SAMPLING_FREQ_TO_LOW
-    f = sampling_rate / (2 * count_meant)
+    f = sampling_rate / (2 * count_mean)
     count = None
     return f