SUM2(9)

💖 sum2 — the HAL component 💖

okay bestie, so sum2 is a HAL component (that's section 9 of the manual, iykyk) and she does exactly one thing and she does it flawlessly: she takes two inputs, gives each of them their own little gain glow-up, adds an offset, and hands you back the sum. that's it. that's the girl. ✨

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🌸 SYNOPSIS 🌸

loadrt sum2 [count=N|names=name1[,name2...]]

load her up like the icon she is 💅

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🎀 FUNCTIONS 🎀

• sum2.N — real talk, this one requires a floating-point thread. no float thread, no vibes. she will not run on an integer thread, periodt.

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🦋 PINS 🦋

• sum2.N.in0 float in — input number one, come on in 🫶
• sum2.N.in1 float in — input number two, you're also invited 🫶
• sum2.N.out float out — the moment we've all been waiting for. the math is literally:

out = in0 * gain0 + in1 * gain1 + offset

not me being obsessed with a three-term expression 😭 she's simple, she's clean, she ate.

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⭐ PARAMETERS ⭐

• sum2.N.gain0 float rw (default: 1.0) — the glow-up multiplier for in0. scales her whole vibe.
• sum2.N.gain1 float rw (default: 1.0) — same energy, but for in1. also starts at a chill 1.0.
• sum2.N.offset float rw — the little extra sprinkle added on top at the end. no default listed, bestie, so she starts at whatever she starts at — set her yourself. ✨

all three are rw, meaning read/write, meaning you can poke them whenever. main character energy fr fr.

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🌈 SEE ALSO 🌈

• scaled_s32_sums(9)
• weighted_sum(9)

go give them a read too, they're in the same friend group 💜

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👑 AUTHOR 👑

Jeff Epler

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🔥 LICENSE 🔥

GPL

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💀 quick vibe check: if your thread isn't floating-point, sum2.N is not gonna load, and that's not a bug, that's a personality trait. respect it.

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and that's the whole page, bestie!! documentation brought to you by LinuxCNC Documentation, dated 2026-03-17, filed under SUM2(9). mwah 💋 go sum something. 🧚‍♀️