56 lines
1.7 KiB
Python
Executable file
56 lines
1.7 KiB
Python
Executable file
#!/usr/bin/env python
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from __future__ import print_function
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from __future__ import division
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""" Generate the stepper delay lookup table for Marlin firmware. """
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import argparse
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__author__ = "Ben Gamari <bgamari@gmail.com>"
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__copyright__ = "Copyright 2012, Ben Gamari"
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__license__ = "GPL"
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('-f', '--cpu-freq', type=int, default=16, help='CPU clockrate in MHz (default=16)')
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parser.add_argument('-d', '--divider', type=int, default=8, help='Timer/counter pre-scale divider (default=8)')
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args = parser.parse_args()
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cpu_freq = args.cpu_freq * 1000000
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timer_freq = cpu_freq / args.divider
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print("#pragma once")
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print()
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print("#if F_CPU == %d" % cpu_freq)
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print()
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print(" const struct { uint16_t base; uint8_t gain; } speed_lookuptable_fast[256] PROGMEM = {")
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a = [0 for i in range(8)] + [ int(0.5 + float(timer_freq) / (i*256)) for i in range(8, 256) ]
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b = [0 for i in range(8)] + [ a[i] - a[i+1] for i in range(8, 255) ]
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b.append(b[-1])
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for i in range(32):
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print(" ", end='')
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for j in range(8):
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print("{ %5d, %5d }," % (a[8*i+j], b[8*i+j]), end='')
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if j < 7: print(" ", end='')
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if i == 0: print(" // dummy first row")
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else: print()
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print(" };")
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print()
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print(" const uint16_t speed_lookuptable_slow[256][2] PROGMEM = {")
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a = [ int(0.5 + float(timer_freq) / ((i*8)+(args.cpu_freq*2))) for i in range(256) ]
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b = [ a[i] - a[i+1] for i in range(255) ]
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b.append(b[-1])
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for i in range(32):
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print(" ", end='')
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for j in range(8):
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print("{ %5d, %5d }," % (a[8*i+j], b[8*i+j]), end='')
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if j < 7: print(" ", end='')
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print()
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print(" };")
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print()
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print("#endif")
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