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SD Card Access very slow

Question asked by harish kasi on May 26, 2011
Latest reply on Oct 6, 2011 by David E Seymour

Hi Everyone,

 

I am trying to get some profiling numbers for our upcoming project. I have connected a Class 6 SD Card to K60 eval board. The low level read access is very slow. Current rate for reading just a sector (512 bytes) is about 800 KB/s.

 

I changed the baud rate clock and this does NOT seem to affect read access. I get approximately same number for 4000000 and 25000000.

 

The low level read function _esdhc_read reads 4 bytes and then waits to check some status. This does not seem to be the most efficient way. How can I improve the performance?  

 

Thanks,

Harish 

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