4 ms·
Arduino pin I/O performance analysis
- jws 17y agoThe Arduino functions have a capability not available in the single opcode instructions, namely the pin number can be a variable. Sometimes you need this, mostly you don't. I recently saw some patches and talk running around on the Arduino developer mailing list where clever use of gcc's const checking directive was used to optimize the constant case to a single opcode, but I don't know if that was clean enough to make it in to a release. Another case when you want to access the port directly is when you need to change the state of several pins simultaneously. And finally: Here is an old post of mine that is nearly ungoogleable about how to get accurate timing of short events on an Arduino: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1175115259 http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1175115259