reflow-oven-control-sw/stm-firmware/settings/settings-sd-card.c

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2020-04-26 20:21:13 +02:00
/* Reflow Oven Controller
*
* Copyright (C) 2020 Mario Hüttel <mario.huettel@gmx.net>
*
* This file is part of the Reflow Oven Controller Project.
*
* The reflow oven controller is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* The Reflow Oven Control Firmware is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the reflow oven controller project.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include <reflow-controller/settings/settings-sd-card.h>
#include <stm-periph/unique-id.h>
#include <fatfs/ff.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void get_controller_folder_path(char *path, size_t size)
{
uint32_t high;
uint32_t mid;
uint32_t low;
if (!path)
return;
unique_id_get(&high, &mid, &low);
snprintf(path, size, "/%08X-%08X-%08X",
(unsigned int)high, (unsigned int)mid, (unsigned int)low);
}
static void get_controller_settings_path(char *path, size_t size, const char *setting)
{
char folder[48];
get_controller_folder_path(folder, sizeof(folder));
snprintf(path, size, "%s/%s.dat", folder, setting);
}
/**
* @brief Open or create the controller folder on the SD Card.
* @param[in,out] controller_folder
* @return 0 if opened, 1 if created and opened, -1 if error.
*/
static int create_controller_folder(void)
{
char foldername[48];
int ret = -1;
FRESULT filesystem_result;
DIR folder;
get_controller_folder_path(foldername, sizeof(foldername));
/* Check if folder is present */
filesystem_result = f_opendir(&folder, foldername);
if (filesystem_result == FR_OK) {
ret = 0;
f_closedir(&folder);
} else {
filesystem_result = f_mkdir(foldername);
if (filesystem_result == FR_OK) {
f_closedir(&folder);
ret = 1;
} else {
ret = -1;
}
}
return ret;
}
static int read_settings_file_float(const char *path, float *value)
{
FRESULT res;
FIL file;
int ret = 0;
char buff[32];
UINT read_count;
if (!value)
return -1002;
res = f_open(&file, path, FA_READ);
if (res == FR_OK) {
memset(buff, 0, sizeof(buff));
res = f_read(&file, buff, sizeof(buff)-1, &read_count);
if (res != FR_OK) {
ret = -1;
goto close_file;
}
*value = strtof(buff, NULL);
close_file:
f_close(&file);
} else {
ret = -2;
}
return ret;
}
int sd_card_settings_save_calibration(float sens_deviation, float offset, bool active)
{
int status;
char path[128];
char buff[64];
UINT bw;
FIL file;
FRESULT res;
int ret = 0;
status = create_controller_folder();
if (status)
return -2;
get_controller_settings_path(path, sizeof(path), "offset");
if (active) {
res = f_open(&file, path, FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK) {
ret = -2;
goto exit_offset;
}
status = snprintf(buff, sizeof(buff), "%f\n", offset);
f_write(&file, buff, status, &bw);
f_close(&file);
} else {
f_unlink(path);
}
exit_offset:
get_controller_settings_path(path, sizeof(path), "sens");
if (active) {
res = f_open(&file, path, FA_CREATE_ALWAYS | FA_WRITE);
if (res != FR_OK) {
ret = -2;
goto exit_sens;
}
status = snprintf(buff, sizeof(buff), "%f\n", sens_deviation);
f_write(&file, buff, status, &bw);
f_close(&file);
} else {
f_unlink(path);
}
exit_sens:
return ret;
}
int sd_card_settings_try_load_calibration(float *sens_deviation, float *offset)
{
char path[128];
int status;
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int ret = 0;
if (!sens_deviation || !offset)
return -1000;
get_controller_settings_path(path, sizeof(path), "offset");
status = read_settings_file_float(path, offset);
if (status) {
ret = status;
goto exit;
}
get_controller_settings_path(path, sizeof(path), "sens");
status = read_settings_file_float(path, sens_deviation);
if (status) {
ret = status;
goto exit;
}
exit:
return ret;
}