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lib: cordic: Move cordic macros and defines to header file

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Now that these macros are in header file, we can eventually
clean up the duplicate macros present in the drivers that
utilize the same cordic algorithm implementation.

Also add CORDIC_ prefix to nonprefixed macros.

Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Priit Laes <plaes@plaes.org>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Priit Laes 2018-11-19 20:01:22 +02:00 committed by Kalle Valo
parent 559afaa2c5
commit 58d81d64e0
2 changed files with 16 additions and 16 deletions
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9
include/linux/cordic.h
View File

@ -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.
*

23
lib/cordic.c
View File

@ -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;
}