jessecrossen
New member
I just ran SdCardTest with Teensy 3.2 and the Audio Adaptor on two Sandisk SD cards, both 16gb. One is a brand new Ultra, and the other is an older version that's all black, apparently a Class 4 from the markings. The odd thing is that the non-ultra card is actually getting better performance and I'm not sure why. Also I'm seeing less variation in the performance between sequential and non-sequential rates than I would expect, which makes me think there might be some other bottleneck. Can anyone verify whether this is normal, and if not give some suggestions as to what I can do to improve it?
Class 4 results:
======================================================
SD Card Test
------------
SD card is connected![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Card type is SDHC
File system space is 15911.79 Mbytes.
SD library is able to access the filesystem
Reading SDTEST1.WAV:
Overall speed = 1.03 Mbyte/sec
Worst block time = 0.92 ms
31.74% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV:
Overall speed = 0.98 Mbyte/sec
Worst block time = 1.89 ms
65.18% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV staggered:
Overall speed = 0.98 Mbyte/sec
Worst block time = 1.46 ms
50.29% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV:
Overall speed = 1.02 Mbyte/sec
Worst block time = 2.77 ms
95.37% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV staggered:
Overall speed = 1.02 Mbyte/sec
Worst block time = 1.90 ms
65.45% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV:
Overall speed = 1.04 Mbyte/sec
Worst block time = 3.62 ms
124.91% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV staggered:
Overall speed = 1.04 Mbyte/sec
Worst block time = 2.34 ms
80.69% of audio frame time
Class 10 Ultra results:
======================================================
SD Card Test
------------
SD card is connected![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Card type is SDHC
File system space is 15506.91 Mbytes.
SD library is able to access the filesystem
Reading SDTEST1.WAV:
Overall speed = 0.62 Mbyte/sec
Worst block time = 1.42 ms
49.05% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV:
Overall speed = 0.56 Mbyte/sec
Worst block time = 3.12 ms
107.57% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV staggered:
Overall speed = 0.56 Mbyte/sec
Worst block time = 2.56 ms
88.27% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV:
Overall speed = 0.57 Mbyte/sec
Worst block time = 4.58 ms
157.89% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV staggered:
Overall speed = 0.57 Mbyte/sec
Worst block time = 3.46 ms
119.26% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV:
Overall speed = 0.59 Mbyte/sec
Worst block time = 5.95 ms
205.22% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV staggered:
Overall speed = 0.59 Mbyte/sec
Worst block time = 4.15 ms
143.00% of audio frame time
Class 4 results:
======================================================
SD Card Test
------------
SD card is connected
Card type is SDHC
File system space is 15911.79 Mbytes.
SD library is able to access the filesystem
Reading SDTEST1.WAV:
Overall speed = 1.03 Mbyte/sec
Worst block time = 0.92 ms
31.74% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV:
Overall speed = 0.98 Mbyte/sec
Worst block time = 1.89 ms
65.18% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV staggered:
Overall speed = 0.98 Mbyte/sec
Worst block time = 1.46 ms
50.29% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV:
Overall speed = 1.02 Mbyte/sec
Worst block time = 2.77 ms
95.37% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV staggered:
Overall speed = 1.02 Mbyte/sec
Worst block time = 1.90 ms
65.45% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV:
Overall speed = 1.04 Mbyte/sec
Worst block time = 3.62 ms
124.91% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV staggered:
Overall speed = 1.04 Mbyte/sec
Worst block time = 2.34 ms
80.69% of audio frame time
Class 10 Ultra results:
======================================================
SD Card Test
------------
SD card is connected
Card type is SDHC
File system space is 15506.91 Mbytes.
SD library is able to access the filesystem
Reading SDTEST1.WAV:
Overall speed = 0.62 Mbyte/sec
Worst block time = 1.42 ms
49.05% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV:
Overall speed = 0.56 Mbyte/sec
Worst block time = 3.12 ms
107.57% of audio frame time
Reading SDTEST1.WAV & SDTEST2.WAV staggered:
Overall speed = 0.56 Mbyte/sec
Worst block time = 2.56 ms
88.27% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV:
Overall speed = 0.57 Mbyte/sec
Worst block time = 4.58 ms
157.89% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV staggered:
Overall speed = 0.57 Mbyte/sec
Worst block time = 3.46 ms
119.26% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV:
Overall speed = 0.59 Mbyte/sec
Worst block time = 5.95 ms
205.22% of audio frame time
Reading SDTEST1.WAV, SDTEST2.WAV, SDTEST3.WAV, SDTEST4.WAV staggered:
Overall speed = 0.59 Mbyte/sec
Worst block time = 4.15 ms
143.00% of audio frame time