Using remotesyn and added NCO

scripts/gen_sin_lut.py

@@ -0,0 +1,21 @@
+import math
+
+# for i in range(0, 64, 4):
+#     for j in range(4):
+#         val = math.sin((i+j) * math.pi/256)
+#         val = int(val*256*1.4)
+#         print(f"6'd{i+j}: dout=8'd{val}; ", end='')
+#     print('')
+
+
+N = 64              # quarter-wave samples
+AMP = 255           # 8-bit max
+for i in range(0, N, 4):
+    line = []
+    for j in range(4):
+        k = i + j
+        theta = k * math.pi / (2*N)      # 0 .. (π/2)*(N-1)/N ; never hits 1.0
+        val = int(math.floor(AMP * math.sin(theta) + 0.5))  # rounded, stays <=254
+        if val > 255: val = 255
+        line.append(f"6'd{k}: dout = 8'd{val};")
+    print(' '.join(line))