Implement EEPROM and use it for saving the calibration

stm-firmware/include/reflow-controller/settings/settings-eeprom.h

@@ -0,0 +1,32 @@
+/* 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/>.
+*/
+
+#ifndef __SETTINGS_SETTINGS_EEPROM_H__
+#define __SETTINGS_SETTINGS_EEPROM_H__
+
+#include <stdbool.h>
+
+bool settings_eeprom_detect_and_prepare(void);
+
+int settings_eeprom_save_calibration(float sens, float offset, bool active);
+
+int settings_eeprom_load_calibration(float *sens, float *offset, bool *active);
+
+#endif /* __SETTINGS_SETTINGS_EEPROM_H__ */

stm-firmware/include/reflow-controller/settings/settings.h

@@ -53,4 +53,6 @@ int settings_load_calibration(float *sens_dev, float *offset);
 
 enum settings_load_result settings_load_pid_oven_parameters(struct oven_pid_settings *settings);
 
+void settings_setup(void);
+
 #endif /* __SETTINGS_SETTINGS_H__ */

stm-firmware/include/reflow-controller/settings/spi-eeprom.h

@@ -22,6 +22,8 @@
 #define __SETTINGS_SPI_EEPROM_H__
 
 #include <stdint.h>
+#include <stdbool.h>
+
 
 int spi_eeprom_init();
 
@@ -29,8 +31,12 @@ void spi_eeprom_deinit();
 
 int spi_eeprom_read(uint32_t addr, uint8_t *rx_buff, uint32_t count);
 
+bool spi_eeprom_write_in_progress(void);
+
 int spi_eeprom_write(uint32_t addr, const uint8_t *data, uint32_t count);
 
 uint8_t spi_eeprom_read_status_reg(void);
 
+bool spi_eeprom_check_connected(void);
+
 #endif /* __SETTINGS_SPI_EEPROM_H__ */