Clock frequency on lpc43xx

[lpcware]

Content originally posted in LPCWare by praveen.9123 on Mon Apr 21 00:08:17 MST 2014
Hi,
I am using lpc4330 ngx xplorer board. How can  i know the particular clock frequency of the sdio and i2s it is running.
I am using the source code of ngx.
http://docs.lpcware.com/lpcopen/v1.03/sysinit__ngx__xplorer__18304330_8c_source.html

Regards,
Praveen