Add fault modes and start implementation of backup SRAM. However, this will probably never be used

stm-firmware/safety/fault.c

@@ -0,0 +1,49 @@
+/* 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/oven-driver.h>
+#include <reflow-controller/digio.h>
+#include <reflow-controller/safety/fault.h>
+
+void HardFault_Handler(void)
+{
+	/* This is a non recoverable fault. Hang here */
+
+	oven_driver_set_power(0);
+	oven_driver_apply_power_level();
+
+	led_set(0, 1);
+
+	while (1);
+}
+
+void panic_mode(void)
+{
+	/* Panic mode is esentially the same as a hardfault,
+	 * but it can be expected, that more functionality is still usable
+	 */
+
+	oven_driver_set_power(0);
+	oven_driver_apply_power_level();
+
+	/* TODO: implement panic mode */
+
+	while (1);
+}