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# sinegen.py - Generate sinewave table
# ... for use with Altera ROMs
#
from math import sin, cos, radians
DEPTH = 1024 # Size of ROM
WIDTH = 10 # Size of data in bits
OUTMAX = 2**WIDTH - 1 # Amplitude of sinewave
filename = "rom_data.mif"
f = open(filename,'w')
# Header for the .mif file
print >> f, "-- ROM Initialization file\n"
print >> f, "DEPTH = %d;" % DEPTH
print >> f, "WIDTH = %d;" % WIDTH
print >> f, "ADDRESS_RADIX = HEX;"
print >> f, "DATA_RADIX = HEX;\n"
print >> f, "CONTENT\nBEGIN\n"
for address in range(DEPTH):
angle = (address*2*pi)/DEPTH
sine_value = sin(angle)
data = int((sine_value)*0.5*OUTMAX)+OUTMAX/2
print "%4x : %4x;" % (address, data)
print >> f, "%4x : %4x;" % (address, data)
print >> f, "END;\n"
f.close()
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