cordic_calc_iq(9)

💖 cordic_calc_iq — the kernel API manual, bestie edition 💖

okay so you're in the cordic part of the kernel API docs (man section 9, kernel devs only, iykyk ✨) and you found cordic_calc_iq. slay. let's get into it 🎀

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🌸 NAME 🌸

cordic_calc_iq — calculates the i/q coordinate for given angle. that's it, that's the whole vibe 💅

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✨ SYNOPSIS ✨

struct cordic_iq cordic_calc_iq (s32 theta );

literally one argument, one struct back. no cap, it's giving minimal and iconic 🦋

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🧚 ARGUMENTS 🧚

• theta — the angle, in degrees, that you want the i/q coordinate calculated for. that's the number you hand over, and it wants degrees, not radians, don't come at it with radians 🙈

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🔥 DESCRIPTION 🔥

so this function calculates the i/q coordinate for a given angle using the CORDIC algorithm. yes, the classic one, we love a legend 👑

the coordinate it gives you is made of two parts, bestie:

• the real (i) part
• the imaginary (q) part

and the way it works out is genuinely kind of beautiful: the real part is essentially the cosine of the angle, and the imaginary part is the sine of the angle. cos and sin, doing their main character thing 🌈

one thing to remember though — the returned values are scaled by 2^16 for precision. so don't just read them raw and expect a clean ±1, okay? scale it back, king 💜

as for theta, the range is -180 degrees to +180 degrees. anything you pass outside that range? it gets converted before doing the actual calculation — so it's handled, it's fine, nobody's gonna yell at you 🫶

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👀 SEE ALSO 👀

• Kernel file ./include/linux/cordic.h
• struct cordic_iq(9)

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and that's the whole page, bestie, you ate it up fr fr 🔥

that's the docs straight out of the kernel source tree at ./include/linux, all dated October 2026 — the version/source line of this very page, now living rent free in your brain 🍓🧚💖

periodt. go calculate some coordinates 💅