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#!/usr/bin/env python3
from pathlib import Path
import datetime
import math
import numpy as np
import uuid
def transition(n):
return (1 - np.cos(np.linspace(0, np.pi, n)))/2
def template_var(ctype, name, value):
value = list(value)
yield f'const {ctype} {name}[{len(value)}] = {{'
for elem in value:
yield f' {elem},'
yield '};'
def quantize(fun, maxval):
for val in fun:
yield round(val*maxval)
def template(ctype, n, erange):
yield ''
yield '/* AUTO-GENERATED SOURCE! DO NOT MODIFY! */'
yield f'/* Generated on {datetime.datetime.now()} by {Path(__file__).name} */'
yield ''
yield "#include <stdint.h>"
yield ''
vals = [x for e in transition(n) for x in [e, e]]
yield from template_var(ctype, 'waveform_zero_one', quantize(vals, erange))
yield ''
vals = reversed(vals)
yield from template_var(ctype, 'waveform_one_zero', quantize(vals, erange))
yield ''
def header(ctype, n, erange):
macro = f'__GEN_WAVE_TABLES_{str(uuid.uuid4()).upper().replace("-", "_")}__'
yield f'#ifndef {macro}'
yield f'#define {macro}'
yield ''
yield '/* AUTO-GENERATED SOURCE! DO NOT MODIFY! */'
yield f'/* Generated on {datetime.datetime.now()} by {Path(__file__).name} */'
yield ''
yield "#include <stdint.h>"
yield ''
yield f'#define WAVEFORM_CONST_ZERO {0}'
yield f'#define WAVEFORM_CONST_ONE 0x{erange:x}'
yield ''
yield f'extern const {ctype} waveform_zero_one[{2*n}];'
yield f'extern const {ctype} waveform_one_zero[{2*n}];'
yield ''
yield f'#endif /* {macro} */'
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--table-size', type=int, default=256)
parser.add_argument('--range', type=int, default=256)
parser.add_argument('--header', action='store_true')
parser.add_argument('--storage-type', type=str, default='uint16_t')
parser.add_argument('outfile', type=argparse.FileType('w'))
args = parser.parse_args()
if args.header:
args.outfile.write('\n'.join(header(args.storage_type, args.table_size, args.range)) + '\n')
else:
args.outfile.write('\n'.join(template(args.storage_type, args.table_size, args.range)) + '\n')
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