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87 lines
6.7 KiB
87 lines
6.7 KiB
/** \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_ConfiguringApps Configuring the Demos, Bootloaders and Projects |
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* |
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* If the target AVR model, clock speed, board or other settings are different to the current settings, they must be changed |
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* and the project recompiled from the source code before being programmed into the AVR microcontroller. Most project |
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* configuration options are located in the "makefile" build script inside each LUFA application's folder, however some |
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* demo or application-specific configuration settings (such as the output format in the AudioOut demo) are located in the |
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* main .c source file of the project. See each project's individual documentation for application-specific configuration |
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* values. |
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* |
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* Each project "makefile" contains all the script and configuration data required to compile each project. When opened with |
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* any regular basic text editor such as Notepad or WordPad (ensure that the save format is a pure ASCII text format) the |
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* build configuration settings may be altered. |
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* |
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* Inside each makefile, a number of configuration variables are located, with the format "<VARIABLE NAME> = <VALUE>". For |
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* each application, the important variables which should be altered are: |
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* |
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* - <b>MCU</b>, the target AVR processor. |
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* - <b>BOARD</b>, the target board hardware |
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* - <b>F_CLOCK</b>, the target raw master clock frequency, before any prescaling is performed |
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* - <b>F_CPU</b>, the target AVR CPU master clock frequency, after any prescaling |
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* - <b>CDEFS</b>, the C preprocessor defines which configure options the source code |
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* - <b>LUFA_PATH</b>, the path to the LUFA library source code |
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* - <b>LUFA_OPTS</b>, the compile time LUFA options which configure the library features |
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* |
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* These values should be changed to reflect the build hardware. |
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* |
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* \section Sec_MCU The MCU Parameter |
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* This parameter indicates the target AVR model for the compiled application. This should be set to the model of the target AVR |
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* (such as the AT90USB1287, or the ATMEGA32U4), in all lower-case (e.g. "at90usb1287"). Note that not all demos support all the |
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* USB AVR models, as they may make use of peripherals or modes only present in some devices. |
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* |
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* For supported library AVR models, see main documentation page. |
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* |
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* \section Sec_BOARD The BOARD Parameter |
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* This parameter indicates the target AVR board hardware for the compiled application. Some LUFA library drivers are board-specific, |
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* such as the LED driver, and the library needs to know the layout of the target board. If you are using one of the board models listed |
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* on the main library page, change this parameter to the board name in all UPPER-case. |
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* |
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* If you are not using any board-specific drivers in the LUFA library, or you are using a custom board layout, change this to read |
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* "USER" (no quotes) instead of a standard board name. If the USER board type is selected and the application makes use of one or more |
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* board-specific hardware drivers inside the LUFA library, then the appropriate stub drives files should be copied from the /BoardStubs/ |
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* directory into a /Board/ folder inside the application directory, and the stub driver completed with the appropriate code to drive the |
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* custom board's hardware. |
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* |
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* \section Sec_F_CLOCK The F_CLOCK Parameter |
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* This parameter indicates the target AVR's input clock frequency, in Hz. This is the actual clock input, before any prescaling is performed. In the |
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* USB AVR architecture, the input clock before any prescaling is fed directly to the PLL subsystem, and thus the PLL is derived directly from the |
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* clock input. The PLL then feeds the USB and other sections of the AVR with the correct upscaled frequencies required for those sections to function. |
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* |
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* <b>Note that this value does not actually *alter* the AVR's input clock frequency</b>, it is just a way to indicate to the library the clock frequency |
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* of the AVR as set by the AVR's fuses. If this value does not reflect the actual running frequency of the AVR, incorrect operation of one of more |
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* library components will occur. |
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* |
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* \section Sec_F_CPU The F_CPU Parameter |
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* This parameter indicates the target AVR's master CPU clock frequency, in Hz. |
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* |
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* <b>Note that this value does not actually *alter* the AVR's CPU clock frequency</b>, it is just a way to indicate to the library the clock frequency |
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* of the AVR core as set by the AVR's fuses. If this value does not reflect the actual running frequency of the AVR, incorrect operation of one of more |
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* library components will occur. |
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* |
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* \section Sec_CDEFS The CDEFS Parameter |
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* Many applications have features which can be controlled by the defining of specially named preprocessor tokens at the point of compilation - for example, |
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* an application might use a compile time token to turn on or off optional or mutually exclusive portions of code. Preprocessor tokens can be |
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* defined here by listing each one with the -D command line switch, and each token can optionally be defined to a specific value. When defined in the |
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* project makefile, these behave as if they were defined in every source file via a normal preprocessor define statement. |
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* |
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* Most applications will actually have multiple CDEF lines, which are concatenated together with the "+=" operator. This ensures that large |
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* numbers of configuration options remain readable by splitting up groups of options into separate lines. |
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* |
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* \section Sec_LUFA_PATH The LUFA_PATH Parameter |
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* As each LUFA program requires the LUFA library source code to compile correctly, the application must know where the LUFA library is located. This |
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* value specifies the path to the LUFA library base relative to the path of the project makefile. |
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* |
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* \section Sec_LUFA_OPTS The LUFA_OPTS Parameter |
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* This value is similar to the CDEFS parameter listed elsewhere -- indeed, it is simply a convenient place to group LUFA related tokens away from the |
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* application's compile time tokens. Normally, these options do not need to be altered to allow an application to compile and run correctly on a |
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* different board or AVR to the current configuration - if the options are incorrect, then the demo is most likely incompatible with the chosen USB AVR |
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* model and cannot be made to function through the altering of the makefile settings alone (or at all). Settings such as the USB mode (device, host or both), |
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* the USB interface speed (Low or Full speed) and other LUFA configuration options can be set here - see \ref Page_TokenSummary documentation for details |
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* on the available LUFA compile time configuration options. |
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*/ |