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Diffstat (limited to 'sensors/akmdfs/AKFS_FileIO.c')
| -rw-r--r-- | sensors/akmdfs/AKFS_FileIO.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/sensors/akmdfs/AKFS_FileIO.c b/sensors/akmdfs/AKFS_FileIO.c new file mode 100644 index 0000000..92c2ce9 --- /dev/null +++ b/sensors/akmdfs/AKFS_FileIO.c @@ -0,0 +1,130 @@ +/****************************************************************************** + * + * 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_FileIO.h" + +/*** Constant definition ******************************************************/ +#ifdef AKFS_PRECISION_DOUBLE +#define AKFS_SCANF_FORMAT "%63s = %lf" +#else +#define AKFS_SCANF_FORMAT "%63s = %f" +#endif +#define AKFS_PRINTF_FORMAT "%s = %f\n" +#define LOAD_BUF_SIZE 64 + +/*! + Load parameters from file which is specified with #path. This function reads + data from a beginning of the file line by line, and check parameter name + sequentially. In otherword, this function depends on the order of eache + parameter described in the file. + @return If function fails, the return value is #AKM_FAIL. When function fails, + the output is undefined. Therefore, parameters which are possibly overwritten + by this function should be initialized again. If function succeeds, the + return value is #AKM_SUCCESS. + @param[out] prms A pointer to #AK8975PRMS structure. Loaded parameter is + stored to the member of this structure. + @param[in] path A path to the setting file. + */ +int16 AKFS_LoadParameters(AK8975PRMS * prms, const char* path) +{ + int16 ret; + char buf[LOAD_BUF_SIZE]; + FILE *fp = NULL; + + /* Open setting file for read. */ + if ((fp = fopen(path, "r")) == NULL) { + AKMERROR_STR("fopen"); + return AKM_FAIL; + } + + ret = 1; + + /* Load data to HO */ + if (fscanf(fp, AKFS_SCANF_FORMAT, buf, &prms->mfv_ho.u.x) != 2) { + ret = 0; + } else { + if (strncmp(buf, "HO.x", sizeof(buf)) != 0) { + ret = 0; + } + } + if (fscanf(fp, AKFS_SCANF_FORMAT, buf, &prms->mfv_ho.u.y) != 2) { + ret = 0; + } else { + if (strncmp(buf, "HO.y", sizeof(buf)) != 0) { + ret = 0; + } + } + if (fscanf(fp, AKFS_SCANF_FORMAT, buf, &prms->mfv_ho.u.z) != 2) { + ret = 0; + } else { + if (strncmp(buf, "HO.z", sizeof(buf)) != 0) { + ret = 0; + } + } + + if (fclose(fp) != 0) { + AKMERROR_STR("fclose"); + ret = 0; + } + + if (ret == 0) { + AKMERROR; + return AKM_FAIL; + } + + return AKM_SUCCESS; +} + +/*! + Save parameters to file which is specified with #path. This function saves + variables when the offsets of magnetic sensor estimated successfully. + @return If function fails, the return value is #AKM_FAIL. When function fails, + the parameter file may collapsed. Therefore, the parameters file should be + discarded. If function succeeds, the return value is #AKM_SUCCESS. + @param[out] prms A pointer to #AK8975PRMS structure. Member variables are + saved to the parameter file. + @param[in] path A path to the setting file. + */ +int16 AKFS_SaveParameters(AK8975PRMS *prms, const char* path) +{ + int16 ret = 1; + FILE *fp; + + /*Open setting file for write. */ + if ((fp = fopen(path, "w")) == NULL) { + AKMERROR_STR("fopen"); + return AKM_FAIL; + } + + /* Save data to HO */ + if (fprintf(fp, AKFS_PRINTF_FORMAT, "HO.x", prms->mfv_ho.u.x) < 0) { ret = 0; } + if (fprintf(fp, AKFS_PRINTF_FORMAT, "HO.y", prms->mfv_ho.u.y) < 0) { ret = 0; } + if (fprintf(fp, AKFS_PRINTF_FORMAT, "HO.z", prms->mfv_ho.u.z) < 0) { ret = 0; } + + if (fclose(fp) != 0) { + AKMERROR_STR("fclose"); + ret = 0; + } + + if (ret == 0) { + AKMERROR; + return AKM_FAIL; + } + + return AKM_SUCCESS; +} + |