LPC4350 SD card benchmarking

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by bowerymarc on Wed Apr 24 13:05:24 MST 2013

I'm hoping others will share their results here.  I've benchmarked the SD card using the Hitex EVA4350, a hacked version of the hitext_eva-4350_periph_sdmmc example code from LPCOpen to do a benchmark (I'll post the code if anyone cares), and a Sandisk Ultra 8GB SD card (actually it's a uSD with an adaptor).  It looks like the SD is being set up for 4-bit datapath and 25MHz clock (when I simply upped that clock to 50MHz in the code, the program failed).


<pre>Initializing RTC (might take few seconds)...Done</pre>
<pre>Hello NXP Semiconductors</pre>
<pre> </pre>
<pre>***SDCARD demo***</pre>
<pre>SD Card Benchmark, 1048576 bytes in 4096 blocks</pre>
<pre>Open root directory.</pre>
<pre>Directory listing...</pre>
<pre>    1048576  BENCH.TXT</pre>
<pre>Creating BENCH.TXT</pre>
<pre>BYTES WRITTEN: 1048576</pre>
<pre>CPU    SPEED: 204.0 (MHz)</pre>
<pre>START   TIME: 2072797338 (ticks)</pre>
<pre>END     TIME: 2274637693 (ticks)</pre>
<pre>Total time: 989413 (uSec)</pre>
<pre>Write time: 963147 (uSec)</pre>
<pre>Write speed: 1088 (kB/S)</pre>
<pre>Open &amp; read benchmark.txt</pre>
<pre>BYTES READ: 1048576</pre>
<pre>CPU    SPEED: 204.0 (MHz)</pre>
<pre>START   TIME: 2278692453 (ticks)</pre>
<pre>END     TIME: 2359377293 (ticks)</pre>
<pre>Total time: 395513 (uSec)</pre>
<pre>Read time: 393769 (uSec)</pre>
<pre>Read speed: 2662 (kB/S)</pre>
<pre>Open root directory.</pre>
<pre>Directory listing...</pre>
<pre>    1048576  BENCH.TXT</pre>
<pre>Test completed.</pre>


So basically, 1MB/s write, 2.6MB/s read speeds with 1MB data file, 4K chunks at a time.  Not very impressive.... maybe I'm missing something?