add some testing tools

tools/gen3byte.py

@@ -0,0 +1,32 @@
+#! /usr/bin/env python3
+#generate 3 byte codes for the RGB bytes
+#refer to https://controllerstech.com/ws2812-leds-using-spi/
+ONE_BIT='110'
+ZERO_BIT='100'
+
+currentStr=''
+
+def checkAndPrint(curr):
+    if len(curr) >= 8:
+        print("0b%s,"%curr[0:8],end='')
+        return curr[8:]
+    return curr
+first=True
+
+print("uint8_t colorTo3Byte[256][3]=")
+print("{")
+for i in range(0,256):
+    if not first:
+        print("},")
+    first=False
+    print("{/*%02d*/"%i,end='')
+    mask=0x80
+    for b in range(0,8):
+        if (i & mask) != 0:
+            currentStr+=ONE_BIT
+        else:
+            currentStr+=ZERO_BIT
+        mask=mask >> 1
+        currentStr=checkAndPrint(currentStr)
+print("}")
+print("};")