===== Add a Button to toggle output pin with indication =====

  * Need to add a button on main screen of **Tomas2** profile instead of "CV" button.
  * The button should toggle output #6
  * The button should have built-in LED indicator to show current Output Pin state.

{{mycnc::mycnc-add-toggle-output-.png}}

The button code in **cnc-screen.xml** will look as 
<code xml>
  <gitem where="work-toolbar" type="xbutton" height="60" 
  image="outputs/transistor-off" action="soft-plc-run:__TR"  
  xattr="2;38;20;20;led;green;round" address="outputs" number="6"/>
</code>

  * **where="work-toolbar"** - Widget name to put the button
  * **type="xbutton"** - Type for button with buil-in LED indicator
  * height="60" - Size for button. It's supposed square button if No "width" attribute given
  * image="outputs/transistor-off" - Skin image for the button
  * xattr="2;38;20;20;led;green;round" - Built-in Led indicator type, color, position and size
  * address="outputs" number="6"- Address (inputs or outputs) and pin number to show state

{{mycnc::mycnc-add-toggle-output--1.png}}


Software PLC procedure source code to toggle output pin will be as follow
<code c>
main()
{

  a=portget (0x406); //read current state of output #6

  if (a==0) {portset(6);} 
  else {portclr(6);};
  exit(99);
  
};
</code>

To add Software PLC procedure - 
  * Go to Software PLC tab
  * Press **+** (Add) button and enter PLC procedure name {{mycnc::mycnc-add-toggle-output--3.png}}
  * Fill the procedure source code
  * Press 2 buttons on the right - **Build All** and **Save** to save sourece code and build PLC binary file

{{mycnc::mycnc-add-toggle-output--2.png}}