Added placeholder docs for tutorials 3 and 4

docs/user/index.rst

@@ -15,6 +15,8 @@ side-bar.
 
             tutorials/tutorial1_blinking_leds.rst
             tutorials/tutorial2_position_capture.rst
+            tutorials/tutorial3_position_compare.rst
+            tutorials/tutorial4_snake_scan.rst
 
         +++
 

docs/user/tutorials/tutorial3_position_compare.rst

@@ -0,0 +1,8 @@
+.. _position_compare_tutorial:
+
+Position Compare Tutorial
+=========================
+
+This tutorial will introduce you to the concept of Position Compare. It will
+show a one dimensional scan of an encoder, how to create trigger pulses
+at regularly spaced positional intervals, and capture time information.

docs/user/tutorials/tutorial4_snake_scan.rst

@@ -0,0 +1,9 @@
+.. _snake_scan_tutorial:
+
+Snake Scan Tutorial
+===================
+
+This tutorial will introduce the concept of table based position compare
+using the SEQ block to do a two dimensional 'snake' scan. This is where the
+X dimension scans forward over the range, Y steps forward, then X scans
+backwards, repeated until the scan is complete.