1 /* 2 ** Copyright 2003-2010, VisualOn, Inc. 3 ** 4 ** Licensed under the Apache License, Version 2.0 (the "License"); 5 ** you may not use this file except in compliance with the License. 6 ** You may obtain a copy of the License at 7 ** 8 ** http://www.apache.org/licenses/LICENSE-2.0 9 ** 10 ** Unless required by applicable law or agreed to in writing, software 11 ** distributed under the License is distributed on an "AS IS" BASIS, 12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 ** See the License for the specific language governing permissions and 14 ** limitations under the License. 15 */ 16 17 /*********************************************************************** 18 * File: homing.c * 19 * * 20 * Description:Performs the homing routines * 21 * * 22 ************************************************************************/ 23 24 #include "typedef.h" 25 #include "cnst.h" 26 #include "basic_op.h" 27 #include "bits.h" 28 #include "homing.tab" 29 encoder_homing_frame_test(Word16 input_frame[])30Word16 encoder_homing_frame_test(Word16 input_frame[]) 31 { 32 Word32 i; 33 Word16 j = 0; 34 35 /* check 320 input samples for matching EHF_MASK: defined in e_homing.h */ 36 for (i = 0; i < L_FRAME16k; i++) 37 { 38 j = (Word16) (input_frame[i] ^ EHF_MASK); 39 40 if (j) 41 break; 42 } 43 44 return (Word16) (!j); 45 } 46 47