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7425af761a
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.
24 lines
1.3 KiB
Plaintext
24 lines
1.3 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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/** \page Page_BuildLibrary Building as a Linkable Library
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*
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* The LUFA library can be built as a proper linkable library (with the extention .a) under AVR-GCC, so that
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* the library does not need to be recompiled with each revision of a user project. Instructions for creating
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* a library from a given source tree can be found in the AVR-GCC user manual included in the WinAVR install
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* /Docs/ directory.
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*
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* However, building the library is <b>not recommended</b>, as the static (compile-time) options will be
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* unable to be changed without a recompilation of the LUFA code. Therefore, if the library is to be built
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* from the LUFA source, it should be made to be application-specific and compiled with the static options
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* that are required for each project (which should be recorded along with the library).
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*
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* Normal library use has the library components compiled in at the same point as the application code, as
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* demonstrated in the library demos and applications. This is the preferred method, as the library is recompiled
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* each time to ensure that all static options for a particular application are applied.
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*/
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