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Hello, a nice day to everyone. Of course i know my thread is not so KEIL specific but i'am not sure how to start it somewhere else.
How can i connect a cheap SD-Card or some other storage medium to an ARM7 microcontroller. The idea is to have mega or giga bytes of memory instead of a few kilo bytes.
I'am looking forward to your friendly suggestions. What about the hardware, what about the software. Can a PC read out the data then from the memory-card?
Cincerly yours :-)
How can i connect a cheap SD-Card or some other storage medium to an ARM7 microcontroller. <p>
Usually, the chip manufacturers have application notes on how to connect various mass storage devices (SD/MMC cards, CF cards, even IDE hard drives) to their chips. Look for those on the manufacturers web sites.
Can a PC read out the data then from the memory-card?<p>
If you use a file system that the PC understands (FAT32 will do), sure.
Unfortunately i don't know the manufacturer of memory card. The manufacturer of ARM7 microcontroller has no information about SD-card on his homepage.
Can you help with further informations?
Saludos cordiales/ Cordiali saluti/ Mit freundlichen Grüßen/ Sincerly yours
Unfortunately i don't know the manufacturer of memory card.
That isn't necessary. The memory card manufacturer won't offer any information - they don't know what chip you actually use.
The manufacturer of ARM7 microcontroller has no information about SD-card on his homepage.<p>
And what company is that ?
You might also check other manufacturers (Atmel, for example, has application notes on how to interface IDE and CF devices with their chips, and sample code for using SD/MMC cards).
Would this help you?
www.altec-computersysteme.com/.../SanDisk_SD_Card_PM_1.9.pdf
Best regards Roger
Or this....
www.sandisk.com/.../SD_SDIO_specsv1.pdf
Google search will yield more...use it.
The most simple solution might be to use the SPI port of your ARM (or a software emulation of it, respectively). All SD/MMC are able to communicate via SPI in an easy manner.
Anyway, it is not really easy to access FAT32 file systems. There should be several source code examples in the web, and Microsoft has tons of information how such a file system is organized. You "just" have to sort it out.
If you want only memory expansion, it might be better to look at the card as a "swap" device. To read/write such a card from the PC, you may use low level access on Windows or Linux (Mac should work also) through the raw device driver.
Hi Roger, just want to say a big thank you very much for your helpful post.
Sincerly yours :-)
Okay, Sven, here is a real, true, 'echt' KICK-start information; explore this website: elm-chan.org/.../mmc_e.html
Roger