Actions
Forum Thread Details
  • Replies 4 replies
  • Subscribers 390 subscribers
  • Views 283 views
  • Users 0 members are here
Related

Arduino trick heard on embedded.fm: use down counters in your while loop

Jan Cumps

When listening to this week's embedded.fm episode ( ), I heard this Arduino tip:

If you use downcounters in stead of upcounters in your loop(), you save a clock cycle each time,

because down counting is a core operation and takes 1 cycle. Up takes 2 cycles.

 

For those cases where you have to pinch that last cycle out of your loop().

Parents

  • Just had a flashback to the days of hand writing for the Z80.

    Decrease, jump non zero was a single instruction. I can't remember if this particular one was a long or short jump.

    The other thing I remember was padding out sound routines with dummy instructions so that each branch took the same number of cycles. Sound on the Spectrum worked by toggling a single bit on one of the output ports.

Reply

  • Just had a flashback to the days of hand writing for the Z80.

    Decrease, jump non zero was a single instruction. I can't remember if this particular one was a long or short jump.

    The other thing I remember was padding out sound routines with dummy instructions so that each branch took the same number of cycles. Sound on the Spectrum worked by toggling a single bit on one of the output ports.

Children
No Data