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Add create_speed_lookup

Ben Gamari 13 years ago
parent
commit
6d7e6a11fc
1 changed files with 53 additions and 0 deletions
  1. 53
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      Marlin/create_speed_lookuptable.py

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Marlin/create_speed_lookuptable.py View File

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+#!/usr/bin/env python
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+
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+""" Generate the stepper delay lookup table for Marlin firmware. """
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+
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+import argparse
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+
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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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+
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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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+
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+cpu_freq = args.cpu_freq * 1000000
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+timer_freq = cpu_freq / args.divider
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+
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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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+
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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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+
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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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+
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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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+
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+print "#endif"
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+

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