SD卡读写程序，拿过来就能用，支持SD卡2G-SD card reader program, to take over will be able to use, support SD card 2G

dsp2407控制步进电机进行画图控制，可同时由正位机和上位机控制，下位机采用按键和液晶交互，上位机采用串口控制，按键由周立功7290控制，与dsp之间采用I2C通信，液晶为t6369,内有详细操作说明。-dsp2407 control the stepper motor for drawing the control, both the anteroposterior and PC machine control, machine keys and lower liquid crystal i