MMC Card Reader

From OpenCircuits
(Difference between revisions)
Jump to: navigation, search
(development phase)
(add development)
Line 15: Line 15:
  
  
==Architecture==
+
==[[MMC Card Reader Development | Development]]==
*See [{{SERVER}}/Multi-purpose_Embedded_System#File_System here] for block diagram
+
*Describe how the development of the project
 
+
 
+
==Development Roadmap==
+
===Phase 1===
+
*Circuit design for interfacing MMC
+
===Phase 2===
+
*SPI driver for MMC
+
===Phase 3===
+
*Wrapper for file system in freertos_posix
+
===Phase 4===
+
*Test for normal read/write function
+
*hotswap (should not hang or cause voltage dip)
+
*multiple file read/write (protection)
+
 
+
 
+
==Circuit and PCB==
+
*[http://multimedia.3m.com/mws/mediawebserver?66666UuZjcFSLXTtmXftMXMXEVuQEcuZgVs6EVs6E666666-- SD Card connector]
+
*SPI interface to main board
+
 
+
 
+
==Software Implementation==
+
*[http://efsl.be/ Embedded Filesystem Library]
+
*[http://elm-chan.org/fsw/ff/00index_e.html FatFs]
+
 
+
  
 
[[category:projects]]
 
[[category:projects]]

Revision as of 18:57, 12 July 2009

This project aims to develop an MMC Card Reader, interfacing with a 8/16 bits embedded system such as the dsPic33F development board.

Contents

Objectives

MultiMedia Card (MMC) is commonly used in portable devices due to their high density, rewritability and low cost. The use of MMC in embedded systems enables the systems to possess a removable, upgradeable and external mass storage.

MMC Manufacturers usually formats the cards in FAT12/FAT16/FAT32, and can be read/write in almost all computers. This project aims to integrate a FAT file system in freertos_posix for reading/writing files in MMC by 8/16-bit embedded systems. The API employs POSIX and Standard C-library standard for I/O operations.

Benefits

  • Save large files (e.g. html) for application feature expansion
  • Provide storage space for upload and upgrade firmware remotely (e.g. over the Internet)
  • Save fonts, image files for GUI applications

Limitations

  • File read/write access may be slow


Development

  • Describe how the development of the project
Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox