Correct delayMicroseconds() timing for 20 MHz boards. [imported]

[cmaglie]

This is Issue 306 moved from a Google Code project.
Added by 2010-07-28T02:18:02.000Z by [email protected].
Please review that bug for more context and additional comments, but update this bug.
Closed (Fixed).

Original labels: Type-Defect, Priority-Medium, Component-Core, Milestone-1.0.1

Original description

What steps will reproduce the problem?

1. Make/Take 20Mhz arduino.
2. Get OneWire lib from your site.
3. Open Example and see what happens.

What is the expected output? What do you see instead?
Working OneWire bus. I see not working one instead.

What version of the Arduino software are you using? On what operating
system? Which Arduino board are you using?
Deumilanove and One that I made run on BreadBoard with Atmega8

Please provide any additional information below.
When using OneWire library on 20Mhz chip, protocol doesn't work due delayMicroseconds function since it assumes one uS as 16 clock but it's 20.

OneWire bus is really sensitive to timing mechanism. But code is definitelly fixes some other problems for 20Mhz too.

I sending a diff file, try to keep things better. Take a look.

Best Regards,
Erdem U. Altinyurt