AK8975_FS/akmdfs/AKFS_APIs_8975/AKFS_Device.c

/******************************************************************************
 * $Id: AKFS_Device.c 580 2012-03-29 09:56:21Z yamada.rj $
 ******************************************************************************
 *
 * Copyright (C) 2012 Asahi Kasei Microdevices Corporation, Japan
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "AKFS_Device.h"

int16 AKFS_InitBuffer(
	const	int16	ndata,		/*!< Size of vector buffer */
			AKFVEC	vdata[]		/*!< Vector buffer */
)
{
	int i;

	/* size check */
	if (ndata <= 0) {
		return AKFS_ERROR;
	}

	for (i=0; i<ndata; i++) {
		vdata[i].u.x = AKFS_INIT_VALUE_F;
		vdata[i].u.y = AKFS_INIT_VALUE_F;
		vdata[i].u.z = AKFS_INIT_VALUE_F;
	}

	return AKFS_SUCCESS;
}

int16 AKFS_BufShift(
	const	int16	len,	/*!< size of buffer */
	const	int16	shift,	/*!< shift size */
			AKFVEC	v[] /*!< buffer */
)
{
	int16 i;

	if((shift < 1) || (len < shift)) {
		return AKFS_ERROR;
	}
	for (i = len-1; i >= shift; i--) {
		v[i] = v[i-shift];
	}
	return AKFS_SUCCESS;
}

int16 AKFS_Rotate(
	const	AKFS_PATNO	pat,
			AKFVEC*		vec
)
{
	AKFLOAT tmp;
	switch(pat){
		/* Obverse */
		case PAT1:
			/* This is Android default */
			break;
		case PAT2:
			tmp = vec->u.x;
			vec->u.x = vec->u.y;
			vec->u.y = -tmp;
			break;
		case PAT3:
			vec->u.x = -(vec->u.x);
			vec->u.y = -(vec->u.y);
			break;
		case PAT4:
			tmp = vec->u.x;
			vec->u.x = -(vec->u.y);
			vec->u.y = tmp;
			break;
		/* Reverse */
		case PAT5:
			vec->u.x = -(vec->u.x);
			vec->u.z = -(vec->u.z);
			break;
		case PAT6:
			tmp = vec->u.x;
			vec->u.x = vec->u.y;
			vec->u.y = tmp;
			vec->u.z = -(vec->u.z);
			break;
		case PAT7:
			vec->u.y = -(vec->u.y);
			vec->u.z = -(vec->u.z);
			break;
		case PAT8:
			tmp = vec->u.x;
			vec->u.x = -(vec->u.y);
			vec->u.y = -tmp;
			vec->u.z = -(vec->u.z);
			break;
		default:
			return AKFS_ERROR;
	}

	return AKFS_SUCCESS;
}