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Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 9:22 pm
by jkeny
These cards are being claimed to be the same sound quality as Panasonic SLC cards
https://www.amazon.com/Industrial-Micro ... SLC%2C+8GB
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 9:46 pm
by jkeny
Just to progress this somewhat - how about doing a group effort to trace the STM pins & develop the schematic for this board?
There are 4 sides to the STM chip & 4 of us could take one side each & trace where the pins of that side connect to
Anyone with one of these SD card players want to volunteer to trace a side?
I'll do the side at the top of the photo - the one nearest the I2S out pins
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 10:01 pm
by seeteeyou
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 10:44 pm
by Fran
I'll take the next side around John - underneath where it says "ARM" in the image above.
I got my flashair card yesterday, and after some figuring out (I can't believe how poor the interface is on this from the company) I have it working for transferring files over tonight. So as proof of concept, it works. Files are fairly fast over the wifi here, and very fast when the files are in the slot on the laptop. Unfortunately, I have some bug in my system here - I can't get it to play anything with a bit rate over 16. It will play both sample rate families so I don't think its the clocks. And it played hi res fine off Nigels card in Tonys. This has yet to be investigated!!
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 10:57 pm
by Fran
Minor rant - it seems that it would be very easy to get cards that "seem" to be SLC but actually are not. Having had a quick look through a few sites, there are lots of cards which initially say SLC, but when you go to the datasheet, they aren't or they say something like SLC with aMLC technology or some other BS.
Grrrr.
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 11:20 pm
by jkeny
Fran wrote: ↑Wed May 23, 2018 10:44 pm
I'll take the next side around John - underneath where it says "ARM" in the image above.
I got my flashair card yesterday, and after some figuring out (I can't believe how poor the interface is on this from the company) I have it working for transferring files over tonight. So as proof of concept, it works. Files are fairly fast over the wifi here, and very fast when the files are in the slot on the laptop. Unfortunately, I have some bug in my system here - I can't get it to play anything with a bit rate over 16. It will play both sample rate families so I don't think its the clocks. And it played hi res fine off Nigels card in Tonys. This has yet to be investigated!!
Cool, Fran - we'll put it all together from each person's mapped connections
Best to use these chip pinouts for this 144 pin STMF407 chip - diagram from the datasheet
Note: pin 1 is marked with the dot on the chip so the corner nearest the SD card - so you are mapping pin 1 to pin 36 - I'm mapping pin 104 to 144
- STMF407.jpg (111.11 KiB) Viewed 1024 times
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 11:33 pm
by nige2000
ill do 37 to 72
will be a few days though, things fairly busy atm
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 11:53 pm
by jkeny
nige2000 wrote: ↑Wed May 23, 2018 11:33 pm
ill do 37 to 72
will be a few days though, things fairly busy atm
Great, no rush on this
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Wed May 23, 2018 11:57 pm
by tims
Would these Intel 64GB 2.5" drives (some listings below) be a cheap SLC option to use with this project? They now sell typically in the $30 to $50 range. Also available in 32GB.
https://www.ebay.com/itm/Intel-SSD-SSDS ... 33e875124c
https://www.ebay.com/itm/Intel-X25-E-SS ... SwbmFanbqu
Re: Computer Audio Blasphemy, nige tries Another SD Card Player
Posted: Thu May 24, 2018 12:11 am
by jkeny
If the advantage of SLC SD cards is lower power & lower electrical noise then I would be a bit worried about these SATA drives power requirements - idle=0.06W Active=2.6W