Bugfixes and improvements for new hardware

FPGA/WindowCoefficientGenerator.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+
+import math
+
+# Adapt these constants to your window requirements
+NUMBER_OF_COEFFICIENTS = 128
+BITS_PER_COEFFICIENT = 16
+
+# If set to true, the coefficients will be scaled to include the window amplitude correction factor.
+# They will also be scaled to 1/8 to have enough headroom for the correction.
+INCLUDE_AMPLITUDE_CORRECTION = True
+
+# Don't change anything below this line
+
+class Window:
+    def __init__(self, name, function, correction):
+        self.name = name
+        self.function = function
+        self.correction = correction
+    
+    def StartFile(self):
+        self.file = open(self.name+".txt", "w")
+
+    def AddCoefficient(self, normalized_index):
+        if not hasattr(self, 'file'):
+            self.StartFile()
+        value = self.function(normalized_index)
+        if INCLUDE_AMPLITUDE_CORRECTION:
+            value = value * self.correction / 8.0
+        value = int(value * (2 ** (BITS_PER_COEFFICIENT-1)))
+        # prevent overflow
+        if value >= (2 ** (BITS_PER_COEFFICIENT-1)):
+            value = value - 1
+        output = "{0:b}".format(value)
+        self.file.write(output.zfill(BITS_PER_COEFFICIENT)+"\n")
+
+def calc_hann(i):
+    return math.sin(math.pi * i) ** 2   
+
+WindowList = []
+WindowList.append(Window("Hann", calc_hann, 2.0))
+
+for i in range(NUMBER_OF_COEFFICIENTS):
+    norm_i = (i+0.5) / NUMBER_OF_COEFFICIENTS
+    for w in WindowList:
+        w.AddCoefficient(norm_i)