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

stm-firmware/stm-periph/backup-ram.c

@@ -0,0 +1,54 @@
+/* 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 <stm-periph/backup-ram.h>
+#include <stm-periph/clock-enable-manager.h>
+#include <stm32/stm32f4xx.h>
+
+void backup_ram_init()
+{
+	rcc_manager_enable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(RCC_APB1ENR_PWREN));
+
+	/* Enable access to backup RAM register set */
+	PWR->CR |= PWR_CR_DBP;
+
+	/* Enable clock for backup ram interface */
+	rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(RCC_AHB1ENR_BKPSRAMEN));
+}
+
+void backup_ram_disable()
+{
+	rcc_manager_disable_clock(&RCC->APB1ENR, BITMASK_TO_BITNO(RCC_APB1ENR_PWREN));
+}
+
+void backup_ram_wipe()
+{
+
+}
+
+int backup_ram_get_data(uint32_t addr, uint32_t *data)
+{
+
+}
+
+int backup_ram_write_data(uint32_t addr, uint32_t data)
+{
+
+}