53 lines
1.4 KiB
Python
Executable file
53 lines
1.4 KiB
Python
Executable file
#!/usr/bin/env python
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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 "#ifndef SPEED_LOOKUPTABLE_H"
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print "#define SPEED_LOOKUPTABLE_H"
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print
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print '#include "Marlin.h"'
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print
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# Based on timer calculations of 'RepRap cartesian firmware' by Zack
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# Smith and Philip Tiefenbacher.
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print "const uint16_t speed_lookuptable_fast[256][2] PROGMEM = {"
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a = [ timer_freq / ((i*256)+32) 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 " ",
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for j in range(8):
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print "{%d, %d}," % (a[8*i+j], b[8*i+j]),
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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 = [ timer_freq / ((i*8)+32) 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 " ",
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for j in range(8):
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print "{%d, %d}," % (a[8*i+j], b[8*i+j]),
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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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