forked from haraldwolff/avr-fw-modules
19 lines
362 B
C
Executable File
19 lines
362 B
C
Executable File
#include "hwo/fixpoint.h"
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/* fp_asin() returns: -90..+90 */
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fixpoint_t fp_asin(fixpoint_t sin)
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{
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if ((sin == 0) || (sin > fp_make(1)))
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return 0;
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if (sin == fp_make(1))
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return fp_make(90);
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if (sin == fp_make(-1))
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return fp_make(-90);
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if (sin > 0)
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return fp_sin_lookup_reverse(sin);
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if (sin < 0)
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return -fp_sin_lookup_reverse(-sin);
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return 0;
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};
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