[En-Nut-Discussion] EIR: SD-Card on SPI
markus.dost at dr-clauss.de
Tue Jan 29 11:29:44 CET 2013
thank you for your advices. At the moment, the SD-Card on my board is
attached to the SSC like on the EIR. For I don't use the audio codec I
would take the advantages of using SPI. But before I redesign my board I
have to be shure that I can still use the Phat-filesystem.
> If you want SPI, the optimal way is to register the SPI bus
I noticed this document, but the section
"At the time of this writing file system support for devices
attached to the SPI bus controller framework is almost non-existent.
There is one exception, the rather simple raw file system.
You may know, that Nut/OS offers the FAT compatible PHAT file
system, which uses MMC/SD-Cards in SPI mode. However, the related low
level drivers implement their own SPI routines. It would be a
benefit to re-write them for using the new SPI bus interface. Work is in
progress to close this gap."
confused me and additional I didn't noticed Oles SPI driver.
Just to be sure: with this driver I initialize the SD-Card with
NutRegisterDevice(&devPhat0, 0, 0); // Phat filesystem
NutRegisterDevice(&devSpiMmcGpio, 0, 0); // SPI driver for MMC
_open("MMC0:/PHAT0", _O_RDWR | _O_BINARY); // mount the Card
and the functionality for reading/writing files and directory operations
remains the same?
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