1 files changed, 16 insertions, 0 deletions
diff --git a/fsm/random.c b/fsm/random.c
new file mode 100644
index 0000000..91fd929
--- /dev/null
+++ b/fsm/random.c
@@ -0,0 +1,16 @@
+// fsm-random.c: Random number generator for SpaghettiMonster.
+// Copyright (C) 2017-2023 Selene ToyKeeper
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#ifdef USE_PSEUDO_RAND
+uint8_t pseudo_rand() {
+    static uint16_t offset = 1024;
+    // loop from 1024 to 4095
+    offset = ((offset + 1) & 0x0fff) | 0x0400;
+    pseudo_rand_seed += 0b01010101;  // 85
+    return pgm_read_byte(offset) + pseudo_rand_seed;
+}
+#endif
+