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SD card write speed with MPC5748G

Question asked by Jerome Li on Nov 21, 2017

I tested the SD card write speed with the following setup: 

HW: MPC574XG-MB + MPC574XG-176DS

SW: based on demo "sdhc_fatfs_mpc5748g"

 

I wrote a data buffer of 512 bytes into a new file, using f_write(), for 2000 times. And this took almost 3.5s. So roughly the write speed was 1MB / 3.5s = 290 KB/s. Is this a normal speed? Very slow, isn't it?

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