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STM32 F429 USB CDC vs USB MSD with USB FS

Question asked by Males.Uros.001 on Oct 29, 2015
Latest reply on Nov 4, 2015 by Males.Uros.001
Hello all,

I have a strange question regarding speed od USB CDC and USB MSD driver for STM32F429.

I implemented USB MSD + eMMC with FatFS support and I am getting 
0.51 MB/s write and 0.69 MB/s read speed results with USB Flash Benchmark app (on Windows).

Now I implemented USB CDC and I am generating 100MB of data and sending out to USB. Write speed (sending from FW to PC) is only 75kB/s .

I expected CDC should be faster than result frm MSD + eMMC test. I do not know, what else to check or test to achieve higher speeds.

I have USB FS type on the board. HS is not possible due to hardware design.

What speed should I normally get from this setups?


Thanks, Uros

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