avrusb实现数据传输

It demonstrates how two more I/O pins can be acquired on the ATTiny45 by omitting the external crystal. Instead of a crystal, the internal RC oscillator is used and AVR-USB is configured to run on 16.5 MHz +/- 1% clock rate with internal synchronization to the host. The example application is a data logger. It reads an ADC conversion value every second and sends it to the host. In order to save the operating system specific host software, it presents itself as a USB keyboard to the host and automatically enters the values it me asures. To get a series of measurement values, just open a text editor or even a spreadsheet like Excel and press the start/stop button on the logger. EasyLogger will start to type values directly into your host application. The LED indicates that EasyLogger is active while it takes samples and sends keystrokes to your computer. FILES IN THE DISTRIBUTION ========================= Readme.txt ........ The file you are currently reading. firmware .......... Source code of the controller firmware. firmware/usbdrv ... USB driver -- See Readme.txt in that directory for info License.txt ....... Public license (GPL2) for all contents of this project. Changelog.txt ..... Logfile documenting changes in firm- and hardware. BUILDING AND INSTALLING ======================= This project can be built on Unix (Linux, FreeBSD or Mac OS X) or Windows. Building on Windows: You need WinAVR to compile the firmware. A package can be downloaded from: WinAVR: http://winavr.sourceforge.net/ To build the firmware with WinAVR, change into the "firmware" directory, check whether you need to edit the "Makefile" (e.g. change the ISP upload tool) and type "make" to compile the source code. Before you upload the code to the device with "make flash", you should set the fuses with "make fuse". Building on Unix (Linux, FreeBSD and Mac): You need the GNU toolchain and avr-libc to compile the firmware. See http://www.nongnu.org/avr-libc/user-manual/install_tools.html for instructions on how to install avr-gcc and avr-libc. To build the firmware, change to the "firmware" directory, edit "Makefile" to use the programmer of your choice and type "make" to compile the source code. Before you upload the code to the device with "make flash", you should set the fuses with "make fuse". ABOUT THE LICENSE ================= It is our intention to make our USB driver and this demo application available to everyone. Moreover, we want to make a broad range of USB projects and ideas for USB devices available to the general public. We therefore want that all projects built with our USB driver are published under an Open Source license. Our license for the USB driver and demo code is the GNU General Public License Version 2 (GPL2). See the file "License.txt" for details. If you don't want to publish your source code under the GPL2, you can simply pay money for AVR-USB. As an additional benefit you get USB PIDs for free, licensed exclusively to you. See the file "CommercialLicense.txt" for details. MORE INFORMATION ================ For more information about Objective Development's firmware-only USB driver for Atmel's AVR microcontrollers please visit the URL http://www.obdev.at/products/avrusb/ A technical documentation of the driver's interface can be found in the file "firmware/usbdrv/usbdrv.h". -- (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH. http://www.obdev.at/ asures. To get a series of measurement values, just open a text editor or even a spreadsheet like Excel and press the start/stop button on the logger. EasyLogger will start to type values directly into your host application. The LED indicates that EasyLogger is active while it takes samples and sends keystrokes to your computer. FILES IN THE DISTRIBUTION ========================= Readme.txt ........ The file you are currently reading. firmware .......... Source code of the controller firmware. firmware/usbdrv ... USB driver -- See Readme.txt in that directory for info License.txt ....... Public license (GPL2) for all contents of this project. Changelog.txt ..... Logfile documenting changes in firm- and hardware. BUILDING AND INSTALLING ======================= This project can be built on Unix (Linux, FreeBSD or Mac OS X) or Windows. Building on Windows: You need WinAVR to compile the firmware. A package can be downloaded from: WinAVR: http://winavr.sourceforge.net/ To build the firmware with WinAVR, change into the "firmware" directory, check whether you need to edit the "Makefile" (e.g. change the ISP upload tool) and type "make" to compile the source code. Before you upload the code to the device with "make flash", you should set the fuses with "make fuse". Building on Unix (Linux, FreeBSD and Mac): You need the GNU toolchain and avr-libc to compile the firmware. See http://www.nongnu.org/avr-libc/user-manual/install_tools.html for instructions on how to install avr-gcc and avr-libc. To build the firmware, change to the "firmware" directory, edit "Makefile" to use the programmer of your choice and type "make" to compile the source code. Before you upload the code to the device with "make flash", you should set the fuses with "make fuse". ABOUT THE LICENSE ================= It is our intention to make our USB driver and this demo application available to everyone. Moreover, we want to make a broad range of USB projects and ideas for USB devices available to the general public. We therefore want that all projects built with our USB driver are published under an Open Source license. Our license for the USB driver and demo code is the GNU General Public License Version 2 (GPL2). See the file "License.txt" for details. If you don't want to publish your source code under the GPL2, you can simply pay money for AVR-USB. As an additional benefit you get USB PIDs for free, licensed exclusively to you. See the file "CommercialLicense.txt" for details. MORE INFORMATION ================ For more information about Objective Development's firmware-only USB driver for Atmel's AVR microcontrollers please visit the URL http://www.obdev.at/products/avrusb/ A technical documentation of the driver's interface can be found in the file "firmware/usbdrv/usbdrv.h". -- (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH. http://www.obdev.at/