The only hardware dependent part is the communication layer talking to the Depending on the libraryĬonfiguration, the memory is either allocated statically or dynamically. Of RAM is used, as listed in the following table. When opening a partition, filesystem, file or directory, a little amount If they are not already used in other program parts. Please note that the numbers above do not include the C library functions Improves performance and reduces implementation complexity. The static RAM is mostly used for buffering memory card access, which
CODEVISION SDCARD PROJECTS CODE
The following table shows some typical code sizes in bytes, using the 20090330 release with a buffered read-write MMC/SD configuration, FAT16 and static memory allocation: The text is read from the UART, line by line. Shows the content of the current directory.Įnsures all buffered data is written to the card. Reinitializes and reopens the memory card.
CODEVISION SDCARD PROJECTS FREE
Shows card manufacturer, status, filesystem capacity and free storage space.
CODEVISION SDCARD PROJECTS SOFTWARE
Not all commands are available in all software configurations. With commands similiar to the Unix shell you can browse different directories, read and write files, create new ones and delete them again. I implemented an example application providing a simple command prompt which is accessible via the UART at 9600 Baud. See the benchmark page to get an idea of the possible data rates. It might not be the smallest or the fastest one, but I think it is quite flexible. The MMC/SD card connector on the soldering side of the circuit board. The circuit board used to implement and test this application. As an additional feature the connector has two electrical switches to detect wether a card is inserted and wether this card is write-protected. It has a simple eject button which, when a card is inserted, needs some space behind the connector itself. The connector is soldered to the bottom side of the board. The circuit board is a self-made and self-soldered board consisting of a single copper layer and standard DIL components, except of the MMC/SD card connector. The first one is the one I started with, but when I implemented FAT16 write support, I ran out of flash space and switched to the ATmega168. I used different microcontrollers during development, the ATmega8 with 8kBytes of flash, and its pin-compatible alternative, the ATmega168 with 16kBytes flash. The circuit which can be downloaded here has been improved with regard to operation stability. It is quite simple and provides an easy test environment. The circuit which was mainly used during development consists of an Atmel AVR microcontroller with some passive components. a simple FAT16/FAT32 read/write implementation.low-level MMC, SD and SDHC read/write routines.This project provides a general purpose library which implements read and write support for MMC, SD and SDHC memory cards.