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SPI/McBSP drivers with EDMA

Hi,

 I just started writing c6657 2-drivers for

  1. SPI peripheral with EDMA
  2. and McBSP peripheral with EDMA
As I look through c6xxx code, there looks several ways of getting. In general can anyone show pointers on a right approach to achieve this. I tried looking through PSP/PDK packages I did not get enough help on it. The CSL APIs are not available. Looks like unless I got these APIs I cannot write based on CSL. 
Is there a right approach to write efficiently. 
   Target: 
       - SPI connected to EDMA3 accessing periodically
       - McBSP is also connected to another EDMA3 accessing buffer periodically. 
How do we start with. 
Regards,
Hari