Hi Rakesh T,
Thanks for your post.
I think, there is an application report SPRA455A for using McBSP as high speed communication port, in which please refer Appendix A which gives you a sample code for McBSP Master Tx. and the code would be compatible for C621x/C671x. Please validate your McBSP Tx. part with this code.
http://www.ti.com/lit/an/spra455a/spra455a.pdf
Thanks & regards,
Sivaraj K
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