05946ed9b2
The lmp90100_evb sample included an implementation of double sqrt, and the on_off_level_lighting_vnd_app sample included an implementation of float sqrtf. Move that code into minimal libc instead of requiring applications to hand-roll their own version. Signed-off-by: Keith Packard <keithp@keithp.com>
24 lines
296 B
C
24 lines
296 B
C
/*
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* Copyright (c) 2019 Vestas Wind Systems A/S
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <math.h>
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double sqrt(double value)
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{
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double sqrt = value / 3;
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int i;
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if (value <= 0) {
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return 0;
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}
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for (i = 0; i < 6; i++) {
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sqrt = (sqrt + value / sqrt) / 2;
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}
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return sqrt;
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}
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