详细说明：c51的usb的通信程序库，支持51兼容的单片机和pdusbd12接口芯片 文件列表: usb_softpack ............\demo程序及开发板 ............\................\D12 USB固件编程.pdf ............\................\d12smart_users_manual.pdf ............\................\Isr.c ............\................\isr.h ............\................\Isr.LST ............\................\Isr.OBJ ............\................\Mainloop.c ............\................\MAINLOOP.H ............\................\Mainloop.LST ............\................\Mainloop.OBJ ............\................\USB51S.LIB ............\................\USBDEMO ............\................\usbdemo.ddk ............\................\usbdemo.edk ............\................\USBDEMO.M51 ............\................\usbdemo.mpf ............\................\usbdemo.Opt ............\................\usbdemo.Uv2 ............\................\usb_i2c ............\................\usb_i2c.hex ............\................\usb_i2c.lnp ............\................\usb_i2c.M51 ............\................\usb_i2c.plg ............\................\致USB用户的公开信.pdf ............\USB_lib ............\.......\Isr.c ............\.......\isr.h ............\.......\USB51S.LIB ............\.......\usb51s.txt……