初始化提交

arduino-cli/libraries/MD_MAXPanel/examples/MD_MAXPanel_Snake/randomseed.h

@@ -0,0 +1,45 @@
+#pragma once
+// Random seed creation --------------------------
+// Adapted from http://www.utopiamechanicus.com/article/arduino-better-random-numbers/
+
+const uint8_t RANDOM_SEED_PORT = A3;    // port read for random seed
+
+uint16_t bitOut(uint8_t port)
+{
+  static bool firstTime = true;
+  uint32_t prev = 0;
+  uint32_t bit1 = 0, bit0 = 0;
+  uint32_t x = 0, limit = 99;
+
+  if (firstTime)
+  {
+    firstTime = false;
+    prev = analogRead(port);
+  }
+
+  while (limit--)
+  {
+    x = analogRead(port);
+    bit1 = (prev != x ? 1 : 0);
+    prev = x;
+    x = analogRead(port);
+    bit0 = (prev != x ? 1 : 0);
+    prev = x;
+    if (bit1 != bit0)
+      break;
+  }
+
+  return(bit1);
+}
+
+uint32_t seedOut(uint16_t noOfBits, uint8_t port)
+{
+  // return value with 'noOfBits' random bits set
+  uint32_t seed = 0;
+
+  for (int i = 0; i<noOfBits; ++i)
+    seed = (seed << 1) | bitOut(port);
+  
+  return(seed);
+}
+//------------------------------------------------------------------------------