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This makes the code pretty easily portable to other architectures if someone wants to make a more modern SIMM programmer. I also was pretty careful to split responsibilities of the different components and give the existing components better names. I'm pretty happy with the organization of the code now. As part of this change I have also heavily optimized the code. In particular, the read and write cycle routines are very important to the overall performance of the programmer. In these routines I had to make some tradeoffs of code performance versus prettiness, but the overall result is much faster programming. Some of these performance changes are the result of what I discovered when I upgraded my AVR compiler. I discovered that it is smarter at looking at 32-bit variables when I use a union instead of bitwise operations. I also shaved off more CPU cycles by carefully making a few small tweaks. I added a bypass for the "program only some chips" mask, because it was adding unnecessary CPU cycles for a feature that is rarely used. I removed the verification feature from the write routine, because we can always verify the data after the write chunk is complete, which is more efficient. I also added assumptions about the initial/final state of the CS/OE/WE pins, which allowed me to remove more valuable CPU cycles from the read/write cycle routines. There are also a few enormous performance optimizations I should have done a long time ago: 1) The code was only handling one received byte per main loop iteration. Reading every byte available cut nearly a minute off of the 8 MB programming time. 2) The code wasn't taking advantage of the faster programming command available in the chips used on the 8 MB SIMM. The end result of all of these optimizations is I have programming time of the 8 MB SIMM down to 3:31 (it used to be 8:43). Another minor issue I fixed: the Micron SIMM chip identification wasn't working properly. It was outputting the manufacturer ID again instead of the device ID.
49 lines
2.8 KiB
Plaintext
49 lines
2.8 KiB
Plaintext
/** \file
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*
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* This file contains special DoxyGen information for the generation of the main page and other special
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* documentation pages. It is not a project source file.
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*/
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/**
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* \mainpage
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*
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* \image html LUFA.png
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* <div align="center"><small><i>Logo design by <a href="http://www.studiomonsoon.com">Studio Monsoon Photography</a></i></small></div>
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* \n
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* <div align="center"><a href="http://www.lufa-lib.org">http://www.lufa-lib.org</a></div>
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* \n
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*
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* <b>LUFA is donationware. For author and donation information, see \ref Page_Donating.</b>
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*
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* LUFA is an open-source USB library for the USB-enabled AVR microcontrollers, released under the MIT license (see \ref Page_LicenseInfo).
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* It supports a large number of USB AVR models and boards (see \ref Page_DeviceSupport). It is designed to provide an easy to use,
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* feature rich framework for the development of USB peripherals and hosts.
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*
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* LUFA focuses on the microcontroller side of USB development only; it includes no PC host USB driver development facilities - other projects
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* such as the Windows Driver Development Kit, Windows USB Device Mode Framework and libusb may be of interest for developing custom OS drivers.
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* While custom USB devices can be made with LUFA using such tools, the included demos all use the inbuilt OS drivers for each USB class for
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* simplicity.
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*
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* The library is currently in a stable release, suitable for download and incorporation into user projects for
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* both host and device modes. For information about the project progression, see the blog link at \ref Page_Resources.
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*
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* LUFA is written specifically for the free AVR-GCC compiler, and uses several GCC-only extensions to make the
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* library API more streamlined and robust. You can download AVR-GCC for free in a convenient windows package,
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* from the the WinAVR website (see \ref Page_Resources).
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*
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* The only required AVR peripherals for LUFA is the USB controller itself and interrupts - LUFA does not require the use of the
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* microcontroller's timers or other hardware, leaving more hardware to the application developer.
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*
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* Accompanying LUFA in the download package is a set of example demo applications, plus several Bootloaders of different classes
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* and open source LUFA powered projects.
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*
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* <b>Subsections:</b>
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* \li \subpage Page_WhyUseLUFA - What are the advantages of using LUFA?
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* \li \subpage Page_LUFAvsAtmelStack - How does LUFA compare to the Atmel USB AVR stack?
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* \li \subpage Page_AlternativeStacks - Alternative USB AVR Stacks
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* \li \subpage Page_LicenseInfo - Project source license and commercial use information
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* \li \subpage Page_Donating - Donating to support this project
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* \li \subpage Page_LibraryApps - Overview of included Demos, Bootloaders and Projects
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*/
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