diff options
| -rw-r--r-- | include/linux/cordic.h | 9 | ||||
| -rw-r--r-- | lib/cordic.c | 23 |
2 files changed, 16 insertions, 16 deletions
diff --git a/include/linux/cordic.h b/include/linux/cordic.h index cf68ca4a508c..3d656f54d64f 100644 --- a/include/linux/cordic.h +++ b/include/linux/cordic.h @@ -18,6 +18,15 @@ #include <linux/types.h> +#define CORDIC_ANGLE_GEN 39797 +#define CORDIC_PRECISION_SHIFT 16 +#define CORDIC_NUM_ITER (CORDIC_PRECISION_SHIFT + 2) + +#define CORDIC_FIXED(X) ((s32)((X) << CORDIC_PRECISION_SHIFT)) +#define CORDIC_FLOAT(X) (((X) >= 0) \ + ? ((((X) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1) \ + : -((((-(X)) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1)) + /** * struct cordic_iq - i/q coordinate. * diff --git a/lib/cordic.c b/lib/cordic.c index 6cf477839ebd..8ef27c12956f 100644 --- a/lib/cordic.c +++ b/lib/cordic.c @@ -16,15 +16,6 @@ #include <linux/module.h> #include <linux/cordic.h> -#define CORDIC_ANGLE_GEN 39797 -#define CORDIC_PRECISION_SHIFT 16 -#define CORDIC_NUM_ITER (CORDIC_PRECISION_SHIFT + 2) - -#define FIXED(X) ((s32)((X) << CORDIC_PRECISION_SHIFT)) -#define FLOAT(X) (((X) >= 0) \ - ? ((((X) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1) \ - : -((((-(X)) >> (CORDIC_PRECISION_SHIFT - 1)) + 1) >> 1)) - static const s32 arctan_table[] = { 2949120, 1740967, @@ -64,16 +55,16 @@ struct cordic_iq cordic_calc_iq(s32 theta) coord.q = 0; angle = 0; - theta = FIXED(theta); + theta = CORDIC_FIXED(theta); signtheta = (theta < 0) ? -1 : 1; - theta = ((theta + FIXED(180) * signtheta) % FIXED(360)) - - FIXED(180) * signtheta; + theta = ((theta + CORDIC_FIXED(180) * signtheta) % CORDIC_FIXED(360)) - + CORDIC_FIXED(180) * signtheta; - if (FLOAT(theta) > 90) { - theta -= FIXED(180); + if (CORDIC_FLOAT(theta) > 90) { + theta -= CORDIC_FIXED(180); signx = -1; - } else if (FLOAT(theta) < -90) { - theta += FIXED(180); + } else if (CORDIC_FLOAT(theta) < -90) { + theta += CORDIC_FIXED(180); signx = -1; } |