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buildroot/share/scripts/createSpeedLookupTable.py

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+#!/usr/bin/env python
+
+from __future__ import print_function
+from __future__ import division
+
+""" 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 "MarlinCore.h"')
+print()
+
+print("const uint16_t speed_lookuptable_fast[256][2] PROGMEM = {")
+a = [ timer_freq / ((i*256)+(args.cpu_freq*2)) 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("  ", end=' ')
+    for j in range(8):
+        print("{%d, %d}," % (a[8*i+j], b[8*i+j]), end=' ')
+    print()
+print("};")
+print()
+
+print("const uint16_t speed_lookuptable_slow[256][2] PROGMEM = {")
+a = [ timer_freq / ((i*8)+(args.cpu_freq*2)) 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("  ", end=' ')
+    for j in range(8):
+        print("{%d, %d}," % (a[8*i+j], b[8*i+j]), end=' ')
+    print()
+print("};")
+print()
+
+print("#endif")
+