Clean up code to reduce duplication by consolidating code into
loops for per-axis actions.
Part 6b moves do_step() from the "tidiest" place into where it's
currently used, dda.c. Binary size goes down another 34 bytes, to
a total savings of 408 bytes and performance is much better, but
still 16% lower than without using loops:
SIZES ATmega... '168 '328(P) '644(P) '1280
FLASH : 19874 bytes 139% 65% 32% 16%
RAM : 2302 bytes 225% 113% 57% 29%
EEPROM: 32 bytes 4% 2% 2% 1%
short-moves.gcode
Statistics (assuming a 20 MHz clock):
LED on occurences: 888.
Sum of all LED on time: 320000 clock cycles.
LED on time minimum: 351 clock cycles.
LED on time maximum: 772 clock cycles.
LED on time average: 360.36 clock cycles.
smooth-curves.gcode
Statistics (assuming a 20 MHz clock):
LED on occurences: 9124.
Sum of all LED on time: 3875874 clock cycles.
LED on time minimum: 356 clock cycles.
LED on time maximum: 773 clock cycles.
LED on time average: 424.8 clock cycles.
triangle-odd.gcode
Statistics (assuming a 20 MHz clock):
LED on occurences: 1636.
Sum of all LED on time: 640357 clock cycles.
LED on time minimum: 351 clock cycles.
LED on time maximum: 773 clock cycles.
LED on time average: 391.416 clock cycles.
Clean up code to reduce duplication by consolidating code into
loops for per-axis actions.
Part 6a is putting stuff inside the step interrupt into a loop,
too. do_step() is put into the "tidiest" place. Binary size goes
down a remarkable 374 bytes, but stepping performance suffers by
almost 30%.
Traumflug's performance measurements:
SIZES ATmega... '168 '328(P) '644(P) '1280
FLASH : 19908 bytes 139% 65% 32% 16%
RAM : 2302 bytes 225% 113% 57% 29%
EEPROM: 32 bytes 4% 2% 2% 1%
short-moves.gcode
Statistics (assuming a 20 MHz clock):
LED on occurences: 888.
Sum of all LED on time: 354537 clock cycles.
LED on time minimum: 390 clock cycles.
LED on time maximum: 806 clock cycles.
LED on time average: 399.253 clock cycles.
smooth-curves.gcode
Statistics (assuming a 20 MHz clock):
LED on occurences: 9124.
Sum of all LED on time: 4268896 clock cycles.
LED on time minimum: 395 clock cycles.
LED on time maximum: 807 clock cycles.
LED on time average: 467.875 clock cycles.
triangle-odd.gcode
Statistics (assuming a 20 MHz clock):
LED on occurences: 1636.
Sum of all LED on time: 706846 clock cycles.
LED on time minimum: 390 clock cycles.
LED on time maximum: 807 clock cycles.
LED on time average: 432.057 clock cycles.
Markus Hitter
Phil Hord
Stephan Walter
Michael Moon