3D-printing/Marlin
1
0
Fork 0
mirror of https://github.com/MarlinFirmware/Marlin.git synced 2025-07-13 17:57:53 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions 4

⚡️ Optimize speed lookup for AVR

Browse source 
Co-Authored-By: tombrazier <68918209+tombrazier@users.noreply.github.com>
This commit is contained in:
Scott Lahteine 2023-03-12 16:29:21 -05:00
parent 3365172e7c
commit 143a8701d5
4 changed files with 176 additions and 181 deletions
Download patch file Download diff file Expand all files Collapse all files

42
buildroot/share/scripts/createSpeedLookupTable.py
View file

@ -19,34 +19,36 @@ 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("#pragma once")
print()
print('#include "MarlinCore.h"')
print("#if F_CPU == %d" % cpu_freq)
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) ]
print(" const struct { uint16_t base; uint8_t gain; } speed_lookuptable_fast[256] PROGMEM = {")
a = [0 for i in range(8)] + [ int(0.5 + float(timer_freq) / (i*256)) for i in range(8, 256) ]
b = [0 for i in range(8)] + [ a[i] - a[i+1] for i in range(8, 255) ]
b.append(b[-1])
for i in range(32):
print(" ", end='')
for j in range(8):
print("{ %5d, %5d }," % (a[8*i+j], b[8*i+j]), end='')
if j < 7: print(" ", end='')
if i == 0: print(" // dummy first row")
else: print()
print(" };")
print()
print(" const uint16_t speed_lookuptable_slow[256][2] PROGMEM = {")
a = [ int(0.5 + float(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=' ')
print(" ", end='')
for j in range(8):
print("{%d, %d}," % (a[8*i+j], b[8*i+j]), end=' ')
print("{ %5d, %5d }," % (a[8*i+j], b[8*i+j]), end='')
if j < 7: print(" ", 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()
print("#endif")