The following configuration is necessary for COS indication using the Yellow LED on 
the RA-42 or RL-20. The RA-42 additionally has a buffered transistor output besides 
the Yellow LED. A buffered output for GPIO4/8 is available on the RA-30 and RA-33 but 
there is no LED indication.  

By default - GPIO8 drives the Yellow LED, or the 2N2222 transistor.  This can be changed 
by severing a trace on the printed circuit board and soldering a jumper in place to route 
GPIO4 to that transistor in the place of GPIO8.  The circuit traces are very small and 
care must be exercised to complete this modification.  

This code has only been tested in HamVoIP.

The COS LED can be driven by software to show the presence of a valid receive signal. 
This uses bit 8 of the CM119. Using the COS LED or its logic is optional. If you decide 
to use it you must configure the software to use the bit defined for the COS LED.  If the 
configuration lines are not already installed you must add them. 

Here are the lines required:

In /etc/asterisk/rpt.conf in the node stanza you want to activate the COS LED add the 
following in the mapping section if it is not already there. 

The xxxxx is the node number for that stanza.

events=eventsxxxxx

EXAMPLE:
[usb] 
events=events44067

Add the event stanza, if it's not already there. If it's there it will look like this, 
[eventsxxxxxx] where xxxxx is your node number.
This can be located anywhere after the node stanzas. Typically between the [schedule] 
and [functions] stanza.

[eventsxxxxxx]
Add the following after the above line. If the lines are already there but commented, 
remove the ';' semicolon from the beginning of the line.

cop,62,GPIO8:1 = c|t|RPT_RXKEYED
cop,62,GPIO8:0 = c|f|RPT_RXKEYED

EXAMPLE:
[events44067]
cop,62,GPIO8:1 = c|t|RPT_RXKEYED
cop,62,GPIO8:0 = c|f|RPT_RXKEYED

If you are typing this in please pay attention to the exact syntax including case or 
better yet cut and paste from here to the file.

Save the rpt.conf file. 

Now you will need to edit the /etc/asterisk/simpleusb.conf file.

Add the following to the stanza for the node you want to indicate the COS.

gpio8=out0

EXAMPLE:
[usb]
gpio8=out0

Save the simpleusb.conf file. 

For these changes to take effect you must restart asterisk, or reboot the box.