Issue #26: Add overtemp limit setting to settings module and load it from EEPROM at startup

stm-firmware/settings/settings-eeprom.c

@@ -23,7 +23,7 @@
 #include <stm-periph/crc-unit.h>
 #include <string.h>
 
-#define EEPROM_HEADER_MAGIC 0xA5
+#define EEPROM_HEADER_MAGIC 0xC5
 #define EEPROM_HEADER_COMP_VER 0x01
 
 static const uint8_t expected_header[2] = {EEPROM_HEADER_MAGIC, EEPROM_HEADER_COMP_VER};
@@ -57,6 +57,7 @@ static bool check_eeprom_header(void)
 static void settings_eeprom_zero()
 {
 	settings_eeprom_save_calibration(0.0f, 0.0f, false);
+	settings_eeprom_save_overtemp_limit(0.0, false);
 }
 
 bool settings_eeprom_detect_and_prepare(void)
@@ -145,10 +146,17 @@ int settings_eeprom_load_calibration(float *sens, float *offset, bool *active)
 	}
 }
 
-int settings_eeprom_save_overtemp_limit(float overtemp_limit)
+int settings_eeprom_save_overtemp_limit(float overtemp_limit, bool active)
 {
 	int res;
 	struct eeprom_over_temp_config over_temp_conf_entry;
+	const uint8_t zero_vals[sizeof(over_temp_conf_entry)] = {0};
+
+	if (!active) {
+		res = spi_eeprom_write(EEPROM_OVER_TEMP_CONFIG_BASE_ADDR, (const uint8_t *)zero_vals,
+				 sizeof(zero_vals));
+		return res ? -1 : 0;
+	}
 
 	over_temp_conf_entry.over_temperature = overtemp_limit;
 	crc_unit_reset();

stm-firmware/settings/settings.c

@@ -64,3 +64,30 @@ void settings_setup(void)
 	else
 		settings_use_eeprom = false;
 }
+
+enum settings_load_result settings_load_overtemp_limit(float *over_temp_limit)
+{
+	int res;
+	float tmp;
+
+	if (!over_temp_limit)
+		return SETT_LOAD_ERR;
+
+	if (!settings_use_eeprom)
+		return SETT_LOAD_FILE_NOT_FOUND;
+
+	res = settings_eeprom_load_overtemp_limit(&tmp);
+	if (res)
+		return SETT_LOAD_DISK_ERR;
+	*over_temp_limit = tmp;
+
+	return SETT_LOAD_SUCCESS;
+}
+
+int settings_save_overtemp_limit(float over_temp_limit, bool active)
+{
+	if (settings_use_eeprom)
+		return settings_eeprom_save_overtemp_limit(over_temp_limit, active);
+	else
+		return -100;
+}