topic Re: Logging to uSD card (filesystems??) in CodeWarrior for MCU

Logging to uSD card (filesystems??)

Iain — Wed, 24 Feb 2010 23:49:32 GMT

Using:

CW 5.9, HCS08QE32, DEMOQE

4D μDrive-USD-G1 μSD card module

I am trying to log data to a micro SD card using the above devices. I am a bit confused by file systems. My uSD unit supports fat16 file system as well as RAW (first time I have heard of this) i think. It uses SCI for communication with the uC. What do I need to do to be able to write data to the card? Is it a case of downloading a premade fat file system and including the file in my project code? Or is it easier to just write data to RAW?

Ideally I would like the data stored in a .txt file or something similar, but not if it involves complicated programming, so really what's the easiest way of doing it?

I am also open to suggestions of a different SD card module, that might make the task easier.

Thanks

Re: Logging to uSD card (filesystems??)

BlackNight — Wed, 24 Feb 2010 23:56:42 GMT

Hello,

it depends a little bit what you want to do. If you want to exchange data with a windows host, then FAT (or: FAT32) is the choice. It means that there is some overhead (compared to RAW), but in my view usually this is very well spend.

I have used http://elm-chan.org/fsw/ff/00index_e.html and made a Processor Expert Embedded component out of it (to make it really ease of use), and successfully reading/writing data from SD cards (including microSD cards). A

Re: Logging to uSD card (filesystems??)

Iain — Tue, 02 Mar 2010 23:33:09 GMT

Thanks BlackNight, on closer inspection, it seems that my uSD module takes care of the FAT16 file system, and has a command set for writing to it.

Re: Logging to uSD card (filesystems??)

gman8 — Sat, 10 Apr 2010 05:57:23 GMT

Hi,

I am making an MP3 player.

I want to connect a micro-SD and an MP3 codec to a MC9S08DZ having 2 SPI buses.

Can you share your code to interface to the micro-SD.

Thanks.

garyArgraves@sbcglobal.net