Note: This small library had written by me several years ago (2012) when I was working on my university project ( Wave Audio Player With AVR Microcontrollers and SD Card) and I just wanted to have it here for memory :)

SD Card Driver Library For AVR MicroControllers

It is tested in CodeVisionAVR IDE with ATMEGA32A

How to Use

Include mega32.h and spi.h headers and then this header sd_lib.h

For example our microcontroller is ATmega32

#include <mega32.h>

#include <spi.h>

#include "sd_lib.h"

Init SPI Registers

SPCR=0x50;

SPSR=0x01;

Init SD Card

It returns 0 If it is initiated correctly

unsigned char  sd_init(void);

Finally use read_sd and read_sd functions to read data.

unsigned char  read_sd(unsigned long int  sector,unsigned char* buffer);

unsigned char  write_sd(unsigned long int sector,unsigned char* buffer);

Input is SD Card sector number and output is sector size buffer array.