Update README.md

serialtimetest/README.md

@@ -14,20 +14,28 @@ Shopbot/1 mil steps = 787 steps/s
 Shopbot/0.1 mil steps = 7,874 steps/s  
 Shopbot/0.1 mil steps/10x microstep = 78,740 steps/s  
 
-# code
+# [SAMD11C embedded code](serialtimetest.D11C.ino)
 
-[PC py](serialtimetest.py)<br>
-[D11C ino](serialtimetest.D11C.ino)
+# [Python host code](serialtimetest.py)
 
 0.2 ms alarm = 1/0.0004 s loop = 2.5 kHz loop = 5 kHz byte rate
 
-# writing to port
+## writing to port
 
 <img src=SDS00001.png width=75%><br>
 <img src=SDS00002.png width=75%><br>
 
-# writing to serial port
+## writing to serial port
 
 <img src=SDS00005.png width=75%><br>
 <img src=SDS00006.png width=75%><br>
 
+# [C host code](serialtimetest.c)
+
+0.1 ms alarm = 10 kHz byte rate
+
+## writing to serial port
+
+<img src=C.SDS00003.png width=75%><br>
+<img src=C.SDS00002.png width=75%><br>
+