程序为D12的USB测试程序 main.c为主程序 D12.c为PDIUSBD12芯片操作子程序 usb,c为usb协议部分 isr.c为中断处理程序 包括定时器中断（没用）/INT0中断（单片机INT0脚与PDIUSBD12中断脚相连） hard.c为硬件底层程序，读写端口 mydev.c为我的设备请求程序-procedures for the testing procedure main.c USB mainly procedure

usb receive main program c

This example firmware is based on Microchip s USB Support Firmware. The purpose of this example is to provide a model for making a USB combination device. This mainly entails having the USB descr iptors set up correctly. File usb_ch9.c conta

Spac5xx的实现是按照标准的USB VIDEO设备的驱动框架编写（其具体的驱动框架可参照/usr/src/linux/drivers/usb/usbvideo.c文件），整个源程序由四个主体部分组成：设备模块的初始化模块和卸载模块，上层软件接口模块，数据传输模块。具体的模块分析如下-Spac5xx implementation is in accordance with the standard USB VIDEO device driver framework of the prepara