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Add create_speed_lookup

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Ben Gamari 2012-03-07 17:41:29 -05:00
parent ce07c9186d
commit 6d7e6a11fc
1 changed files with 53 additions and 0 deletions
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53
Marlin/create_speed_lookuptable.py Executable file
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#!/usr/bin/env python
""" Generate the stepper delay lookup table for Marlin firmware. """
import argparse
__author__ = "Ben Gamari <bgamari@gmail.com>"
__copyright__ = "Copyright 2012, Ben Gamari"
__license__ = "GPL"
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('-f', '--cpu-freq', type=int, default=16, help='CPU clockrate in MHz (default=16)')
parser.add_argument('-d', '--divider', type=int, default=8, help='Timer/counter pre-scale divider (default=8)')
args = parser.parse_args()
cpu_freq = args.cpu_freq * 1000000
timer_freq = cpu_freq / args.divider
print "#ifndef SPEED_LOOKUPTABLE_H"
print "#define SPEED_LOOKUPTABLE_H"
print
print '#include "Marlin.h"'
print
# Based on timer calculations of 'RepRap cartesian firmware' by Zack
# Smith and Philip Tiefenbacher.
print "const uint16_t speed_lookuptable_fast[256][2] PROGMEM = {"
a = [ timer_freq / ((i*256)+32) for i in range(256) ]
b = [ a[i] - a[i+1] for i in range(255) ]
b.append(b[-1])
for i in range(32):
print " ",
for j in range(8):
print "{%d, %d}," % (a[8*i+j], b[8*i+j]),
print
print "};"
print
print "const uint16_t speed_lookuptable_slow[256][2] PROGMEM = {"
a = [ timer_freq / ((i*8)+32) for i in range(256) ]
b = [ a[i] - a[i+1] for i in range(255) ]
b.append(b[-1])
for i in range(32):
print " ",
for j in range(8):
print "{%d, %d}," % (a[8*i+j], b[8*i+j]),
print
print "};"
print
print "#endif"