Issue #20: Implement driver for RNG

stm-firmware/include/stm-periph/rng.h

@@ -0,0 +1,42 @@
+/* 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.
+ *
+ * GDSII-Converter 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 __STM_RNG_H__
+#define __STM_RNG_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+enum random_number_error {
+	RNG_ERROR_OK = 0,
+	RNG_ERROR_INACT,
+	RNG_ERROR_INTERNAL_ERROR,
+	RNG_ERROR_NOT_READY
+};
+
+void random_number_gen_init(bool int_enable);
+
+void random_number_gen_deinit();
+
+void random_number_gen_reset(bool int_en);
+
+enum random_number_error random_number_gen_get_number(uint32_t *random_number, bool wait_for_valid_value);
+
+#endif /* __STM_RNG_H__ */