1 /****************************************************************************** 2 * $Id: AKFS_FileIO.c 580 2012-03-29 09:56:21Z yamada.rj $ 3 ****************************************************************************** 4 * 5 * Copyright (C) 2012 Asahi Kasei Microdevices Corporation, Japan 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 #include "AKFS_FileIO.h" 20 21 /*** Constant definition ******************************************************/ 22 #ifdef AKFS_PRECISION_DOUBLE 23 #define AKFS_SCANF_FORMAT "%63s = %lf" 24 #else 25 #define AKFS_SCANF_FORMAT "%63s = %f" 26 #endif 27 #define AKFS_PRINTF_FORMAT "%s = %f\n" 28 #define LOAD_BUF_SIZE 64 29 30 /*! 31 Load parameters from file which is specified with #path. This function reads 32 data from a beginning of the file line by line, and check parameter name 33 sequentially. In otherword, this function depends on the order of eache 34 parameter described in the file. 35 @return If function fails, the return value is #AKM_FAIL. When function fails, 36 the output is undefined. Therefore, parameters which are possibly overwritten 37 by this function should be initialized again. If function succeeds, the 38 return value is #AKM_SUCCESS. 39 @param[out] prms A pointer to #AK8975PRMS structure. Loaded parameter is 40 stored to the member of this structure. 41 @param[in] path A path to the setting file. 42 */ 43 int16 AKFS_LoadParameters(AK8975PRMS * prms, const char* path) 44 { 45 int16 ret; 46 char buf[LOAD_BUF_SIZE]; 47 FILE *fp = NULL; 48 49 /* Open setting file for read. */ 50 if ((fp = fopen(path, "r")) == NULL) { 51 AKMERROR_STR("fopen"); 52 return AKM_FAIL; 53 } 54 55 ret = 1; 56 57 /* Load data to HO */ 58 if (fscanf(fp, AKFS_SCANF_FORMAT, buf, &prms->mfv_ho.u.x) != 2) { 59 ret = 0; 60 } else { 61 if (strncmp(buf, "HO.x", sizeof(buf)) != 0) { 62 ret = 0; 63 } 64 } 65 if (fscanf(fp, AKFS_SCANF_FORMAT, buf, &prms->mfv_ho.u.y) != 2) { 66 ret = 0; 67 } else { 68 if (strncmp(buf, "HO.y", sizeof(buf)) != 0) { 69 ret = 0; 70 } 71 } 72 if (fscanf(fp, AKFS_SCANF_FORMAT, buf, &prms->mfv_ho.u.z) != 2) { 73 ret = 0; 74 } else { 75 if (strncmp(buf, "HO.z", sizeof(buf)) != 0) { 76 ret = 0; 77 } 78 } 79 80 if (fclose(fp) != 0) { 81 AKMERROR_STR("fclose"); 82 ret = 0; 83 } 84 85 if (ret == 0) { 86 AKMERROR; 87 return AKM_FAIL; 88 } 89 90 return AKM_SUCCESS; 91 } 92 93 /*! 94 Save parameters to file which is specified with #path. This function saves 95 variables when the offsets of magnetic sensor estimated successfully. 96 @return If function fails, the return value is #AKM_FAIL. When function fails, 97 the parameter file may collapsed. Therefore, the parameters file should be 98 discarded. If function succeeds, the return value is #AKM_SUCCESS. 99 @param[out] prms A pointer to #AK8975PRMS structure. Member variables are 100 saved to the parameter file. 101 @param[in] path A path to the setting file. 102 */ 103 int16 AKFS_SaveParameters(AK8975PRMS *prms, const char* path) 104 { 105 int16 ret = 1; 106 FILE *fp; 107 108 /*Open setting file for write. */ 109 if ((fp = fopen(path, "w")) == NULL) { 110 AKMERROR_STR("fopen"); 111 return AKM_FAIL; 112 } 113 114 /* Save data to HO */ 115 if (fprintf(fp, AKFS_PRINTF_FORMAT, "HO.x", prms->mfv_ho.u.x) < 0) { ret = 0; } 116 if (fprintf(fp, AKFS_PRINTF_FORMAT, "HO.y", prms->mfv_ho.u.y) < 0) { ret = 0; } 117 if (fprintf(fp, AKFS_PRINTF_FORMAT, "HO.z", prms->mfv_ho.u.z) < 0) { ret = 0; } 118 119 if (fclose(fp) != 0) { 120 AKMERROR_STR("fclose"); 121 ret = 0; 122 } 123 124 if (ret == 0) { 125 AKMERROR; 126 return AKM_FAIL; 127 } 128 129 return AKM_SUCCESS; 130 } 131 132
