refactoring

README.md

@@ -30,11 +30,13 @@ perfect choice for easy development of this project.
 
 Video demo - [YouTube video](https://youtu.be/vcedo59raS4)
 
-# Current command support
-G0, G1, G2, G3, G4, G17, G18, G19, G20, G21, G28, G53, G90, G91, G92, M2, M3,
-M5, M30  
-Commands can be easily added, see [gmachine.py](./cnc/gmachine.py) file.  
-Four axis are supported - X, Y, Z, E
+# Current gcode support
+Commands G0, G1, G2, G3, G4, G17, G18, G19, G20, G21, G28, G53, G90, G91, G92, M2, M3,
+M5, M30 are supported. Commands can be easily added, see
+[gmachine.py](./cnc/gmachine.py) file.  
+Four axis are supported - X, Y, Z, E.  
+Spindle with rpm control is supported.  
+Circular interpolation for XY, ZX, YZ planes is supported.
 
 # Config
 All configs are stored in [config.py](./cnc/config.py) and contain hardware
@@ -47,8 +49,8 @@ So having Raspberry Pi connected this way, there is no need to configure
 pin map for project.
 
 # Hardware
-Currently, this project supports Raspberry Pi 1-3. Tested with RPI2 and RPI3.
-But there is a way to add new boards. See [hal.py](./cnc/hal.py) file.
+Currently, this project supports Raspberry Pi 1-3. Developed and tested with
+RPI3. And there is a way to add new boards. See [hal.py](./cnc/hal.py) file.
 _Note: Current Raspberry Pi implementation uses the same resources as on board
 3.5 mm jack(PWM module), so do not use it. HDMI audio works._
 
@@ -67,7 +69,7 @@ sudo pip remove pycnc
 ```
 
 # Performance notice
-Pure Python interpreter wouldn't provide great performance for high speed
+Pure Python interpreter would not provide great performance for high speed
 machines. Overspeeding setting causes motors mispulses and probably lose of
 trajectory. According to my tests, Raspberry Pi 2 can handle axises with 400
  pulses on mm with top velocity ~800 mm per min. There is always way out! :)