Multimedia Cards

The answer is it's either easy or hard. Email me offline and I'll provide you with a published manufacturers MMC card datasheet that includes all of what you need without having to purchase the spec. from MMCA.

If you want to use the embedded FAT16 filesystem, it can be quite a bit of work. If you want to just store and retrieve data using 512-byte blocks, it's really quite easy. An 8-pin PIC could do it.

Noel

snipped-for-privacy@home.now wrote:

--
Noel's Lab
www.noels-lab.com
Chips, firmware, circuits and embedded systems

There is some C code for a Pic micro at:

This should be easy to port to another micro. It stores and retrieves data in 512 byte blocks, however, as the previous poster pointed out, if you need a FAT filesystem, you are looking at a lot of work. Regards.

Here is some references to MMC cards Rob pointed to me...I am not sure whether it contains sufficient information for a decent project...

For a low sampling rate ADC, I guess SmartMedia is better candidate than MMC... SmartMedia allows direct I/O operation in 8-bits and pretty simple to use...

If you only write ADC samples to the flash in FAT files, I guess the amount of work is not that great...

Kelvin

Yes, the MMC doc will be more then enough for read/write to MMC cards.

But, I th> Here is some references to MMC cards Rob pointed to me...I am not sure

hamilton you could be true...I am only reading and I have not done any FAT project yet.

In my app, it will be simple. SM has only one empty file, which I formatted and copied in Windows.

During initialization, my ARM reads page by page then searches for my filename (make it short-form) and calculates the file's starting address...this involves sime FAT thing...

During ADC, ARM saves the frame in RAM...then transfers it into the card and closes the file...

Sounds simple enough...

Kelvin

use...

amount

Well...correction...After reading an MMC datasheet...actually MMC is as simple to use as SmartMedia though it is slower...

Kelvin

use...

amount