git.zerfleddert.de Git - fnordlicht-mini/blob - firmware/doc/pwm_table.py

   1 #!/usr/bin/python
   2 #
   3 #  compute pwm reference table
   4
   5 clock = 16000000
   6 basefreq = 125
   7 levels = 256
   8 interval_cycles = 64000
   9
  10 if __name__ == "__main__":
  11     last = 0
  12     sum = 0
  13     for i in range(1,levels):
  14         cycles = (i/float(levels-1))**2*float(clock)/float(basefreq)
  15         delta = round(cycles-last)
  16         print "%6d: %10d %6d %6d" % (i, round(cycles), delta, round(cycles) % interval_cycles)
  17         last = cycles
  18         sum+=delta
  19
  20 print "sum: %d" % sum