Re: atan2 and sqrt --> in driver

[christos%astron.com@localhost (Christos Zoulas)]

In article 
<fb9584ff0812090901p6cd5ccd0o39af3642590f7e33%mail.gmail.com@localhost>,
Robert Fritzsche <robert.fritzsche%googlemail.com@localhost> wrote:
>The driver is for the wii-remote, so get 1 byte for x-, y- and z-axis.
>Based on this values I will calculate the pitch = atan2(y,
>sqrt(x^2+z^2)) and yaw = atan2(z, sqrt(x^2+y^2))
>
>I know that I can place all these stuff in userspace, but it have
>place it into kernelspace, it's for studies.

You can use fixed point arithmetic in conjunction with cordic and/or table
based algorithms.

christos