SD卡的资料整理！有sd卡驱动的51的例程、avr的例程以及一些可移植的c、h文件！-SD card data compilation! There are 51 sd card driver routines, avr s routine as well as some portable c, h files!

主要介绍avr单片机的20个例程，实现一些小的功能，面向avr单片机初学者-Introduces the avr microcontroller 20 routines to implement some small features, for avr microcontroller for beginners