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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/COPYING.GPLv2 | 339 | ||||
| -rw-r--r-- | doc/COPYING.GPLv3 | 674 | ||||
| -rw-r--r-- | doc/FUSE.txt | 40 | ||||
| -rw-r--r-- | doc/POWER.txt | 62 | ||||
| -rw-r--r-- | doc/USB_NKRO.txt | 160 |
5 files changed, 1275 insertions, 0 deletions
diff --git a/doc/COPYING.GPLv2 b/doc/COPYING.GPLv2 new file mode 100644 index 000000000..d159169d1 --- /dev/null +++ b/doc/COPYING.GPLv2 @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must show them these terms so they know their +rights. + + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. + + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. + + Finally, any free program is threatened constantly by software +patents. We wish to avoid the danger that redistributors of a free +program will individually obtain patent licenses, in effect making the +program proprietary. To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. You may modify your copy or copies of the Program or any portion +of it, thus forming a work based on the Program, and copy and +distribute such modifications or work under the terms of Section 1 +above, provided that you also meet all of these conditions: + + a) You must cause the modified files to carry prominent notices + stating that you changed the files and the date of any change. + + b) You must cause any work that you distribute or publish, that in + whole or in part contains or is derived from the Program or any + part thereof, to be licensed as a whole at no charge to all third + parties under the terms of this License. + + c) If the modified program normally reads commands interactively + when run, you must cause it, when started running for such + interactive use in the most ordinary way, to print or display an + announcement including an appropriate copyright notice and a + notice that there is no warranty (or else, saying that you provide + a warranty) and that users may redistribute the program under + these conditions, and telling the user how to view a copy of this + License. (Exception: if the Program itself is interactive but + does not normally print such an announcement, your work based on + the Program is not required to print an announcement.) + +These requirements apply to the modified work as a whole. If +identifiable sections of that work are not derived from the Program, +and can be reasonably considered independent and separate works in +themselves, then this License, and its terms, do not apply to those +sections when you distribute them as separate works. But when you +distribute the same sections as part of a whole which is a work based +on the Program, the distribution of the whole must be on the terms of +this License, whose permissions for other licensees extend to the +entire whole, and thus to each and every part regardless of who wrote it. + +Thus, it is not the intent of this section to claim rights or contest +your rights to work written entirely by you; rather, the intent is to +exercise the right to control the distribution of derivative or +collective works based on the Program. + +In addition, mere aggregation of another work not based on the Program +with the Program (or with a work based on the Program) on a volume of +a storage or distribution medium does not bring the other work under +the scope of this License. + + 3. You may copy and distribute the Program (or a work based on it, +under Section 2) in object code or executable form under the terms of +Sections 1 and 2 above provided that you also do one of the following: + + a) Accompany it with the complete corresponding machine-readable + source code, which must be distributed under the terms of Sections + 1 and 2 above on a medium customarily used for software interchange; or, + + b) Accompany it with a written offer, valid for at least three + years, to give any third party, for a charge no more than your + cost of physically performing source distribution, a complete + machine-readable copy of the corresponding source code, to be + distributed under the terms of Sections 1 and 2 above on a medium + customarily used for software interchange; or, + + c) Accompany it with the information you received as to the offer + to distribute corresponding source code. (This alternative is + allowed only for noncommercial distribution and only if you + received the program in object code or executable form with such + an offer, in accord with Subsection b above.) + +The source code for a work means the preferred form of the work for +making modifications to it. For an executable work, complete source +code means all the source code for all modules it contains, plus any +associated interface definition files, plus the scripts used to +control compilation and installation of the executable. However, as a +special exception, the source code distributed need not include +anything that is normally distributed (in either source or binary +form) with the major components (compiler, kernel, and so on) of the +operating system on which the executable runs, unless that component +itself accompanies the executable. + +If distribution of executable or object code is made by offering +access to copy from a designated place, then offering equivalent +access to copy the source code from the same place counts as +distribution of the source code, even though third parties are not +compelled to copy the source along with the object code. + + 4. You may not copy, modify, sublicense, or distribute the Program +except as expressly provided under this License. Any attempt +otherwise to copy, modify, sublicense or distribute the Program is +void, and will automatically terminate your rights under this License. +However, parties who have received copies, or rights, from you under +this License will not have their licenses terminated so long as such +parties remain in full compliance. + + 5. You are not required to accept this License, since you have not +signed it. However, nothing else grants you permission to modify or +distribute the Program or its derivative works. These actions are +prohibited by law if you do not accept this License. Therefore, by +modifying or distributing the Program (or any work based on the +Program), you indicate your acceptance of this License to do so, and +all its terms and conditions for copying, distributing or modifying +the Program or works based on it. + + 6. Each time you redistribute the Program (or any work based on the +Program), the recipient automatically receives a license from the +original licensor to copy, distribute or modify the Program subject to +these terms and conditions. You may not impose any further +restrictions on the recipients' exercise of the rights granted herein. +You are not responsible for enforcing compliance by third parties to +this License. + + 7. If, as a consequence of a court judgment or allegation of patent +infringement or for any other reason (not limited to patent issues), +conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot +distribute so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you +may not distribute the Program at all. For example, if a patent +license would not permit royalty-free redistribution of the Program by +all those who receive copies directly or indirectly through you, then +the only way you could satisfy both it and this License would be to +refrain entirely from distribution of the Program. + +If any portion of this section is held invalid or unenforceable under +any particular circumstance, the balance of the section is intended to +apply and the section as a whole is intended to apply in other +circumstances. + +It is not the purpose of this section to induce you to infringe any +patents or other property right claims or to contest validity of any +such claims; this section has the sole purpose of protecting the +integrity of the free software distribution system, which is +implemented by public license practices. Many people have made +generous contributions to the wide range of software distributed +through that system in reliance on consistent application of that +system; it is up to the author/donor to decide if he or she is willing +to distribute software through any other system and a licensee cannot +impose that choice. + +This section is intended to make thoroughly clear what is believed to +be a consequence of the rest of this License. + + 8. If the distribution and/or use of the Program is restricted in +certain countries either by patents or by copyrighted interfaces, the +original copyright holder who places the Program under this License +may add an explicit geographical distribution limitation excluding +those countries, so that distribution is permitted only in or among +countries not thus excluded. In such case, this License incorporates +the limitation as if written in the body of this License. + + 9. The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + <one line to give the program's name and a brief idea of what it does.> + Copyright (C) <year> <name of author> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + <signature of Ty Coon>, 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/doc/COPYING.GPLv3 b/doc/COPYING.GPLv3 new file mode 100644 index 000000000..94a9ed024 --- /dev/null +++ b/doc/COPYING.GPLv3 @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +them if you wish), that you receive source code or can get it if you +want it, that you can change the software or use pieces of it in new +free programs, and that you know you can do these things. + + To protect your rights, we need to prevent others from denying you +these rights or asking you to surrender the rights. Therefore, you have +certain responsibilities if you distribute copies of the software, or if +you modify it: responsibilities to respect the freedom of others. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must pass on to the recipients the same +freedoms that you received. You must make sure that they, too, receive +or can get the source code. And you must show them these terms so they +know their rights. + + Developers that use the GNU GPL protect your rights with two steps: +(1) assert copyright on the software, and (2) offer you this License +giving you legal permission to copy, distribute and/or modify it. + + For the developers' and authors' protection, the GPL clearly explains +that there is no warranty for this free software. For both users' and +authors' sake, the GPL requires that modified versions be marked as +changed, so that their problems will not be attributed erroneously to +authors of previous versions. + + Some devices are designed to deny users access to install or run +modified versions of the software inside them, although the manufacturer +can do so. This is fundamentally incompatible with the aim of +protecting users' freedom to change the software. The systematic +pattern of such abuse occurs in the area of products for individuals to +use, which is precisely where it is most unacceptable. Therefore, we +have designed this version of the GPL to prohibit the practice for those +products. If such problems arise substantially in other domains, we +stand ready to extend this provision to those domains in future versions +of the GPL, as needed to protect the freedom of users. + + Finally, every program is threatened constantly by software patents. +States should not allow patents to restrict development and use of +software on general-purpose computers, but in those that do, we wish to +avoid the special danger that patents applied to a free program could +make it effectively proprietary. To prevent this, the GPL assures that +patents cannot be used to render the program non-free. + + The precise terms and conditions for copying, distribution and +modification follow. + + TERMS AND CONDITIONS + + 0. Definitions. + + "This License" refers to version 3 of the GNU General Public License. + + "Copyright" also means copyright-like laws that apply to other kinds of +works, such as semiconductor masks. + + "The Program" refers to any copyrightable work licensed under this +License. Each licensee is addressed as "you". "Licensees" and +"recipients" may be individuals or organizations. + + To "modify" a work means to copy from or adapt all or part of the work +in a fashion requiring copyright permission, other than the making of an +exact copy. The resulting work is called a "modified version" of the +earlier work or a work "based on" the earlier work. + + A "covered work" means either the unmodified Program or a work based +on the Program. + + To "propagate" a work means to do anything with it that, without +permission, would make you directly or secondarily liable for +infringement under applicable copyright law, except executing it on a +computer or modifying a private copy. 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But first, please read +<http://www.gnu.org/philosophy/why-not-lgpl.html>. diff --git a/doc/FUSE.txt b/doc/FUSE.txt new file mode 100644 index 000000000..40055e5ab --- /dev/null +++ b/doc/FUSE.txt @@ -0,0 +1,40 @@ +ATMega168P Fuse/Lock Bits +========================= +This configuration is from usbasploader's Makefile. + + HFUSE 0xD6 + LFUSE 0xDF + EFUSE 0x00 + LOCK 0x3F(intact) + +#--------------------------------------------------------------------- +# ATMega168P +#--------------------------------------------------------------------- +# Fuse extended byte: +# 0x00 = 0 0 0 0 0 0 0 0 <-- BOOTRST (boot reset vector at 0x1800) +# \+/ +# +------- BOOTSZ (00 = 2k bytes) +# Fuse high byte: +# 0xd6 = 1 1 0 1 0 1 1 0 +# ^ ^ ^ ^ ^ \-+-/ +# | | | | | +------ BODLEVEL 0..2 (110 = 1.8 V) +# | | | | + --------- EESAVE (preserve EEPROM over chip erase) +# | | | +-------------- WDTON (if 0: watchdog always on) +# | | +---------------- SPIEN (allow serial programming) +# | +------------------ DWEN (debug wire enable) +# +-------------------- RSTDISBL (reset pin is enabled) +# Fuse low byte: +# 0xdf = 1 1 0 1 1 1 1 1 +# ^ ^ \ / \--+--/ +# | | | +------- CKSEL 3..0 (external >8M crystal) +# | | +--------------- SUT 1..0 (crystal osc, BOD enabled) +# | +------------------ CKOUT (if 0: Clock output enabled) +# +-------------------- CKDIV8 (if 0: divide by 8) + + +# Lock Bits +# 0x3f = - - 1 1 1 1 1 1 +# \ / \-/ \-/ +# | | +----- LB 2..1 (No memory lock features enabled) +# | +--------- BLB0 2..1 (No restrictions for SPM or LPM accessing the Application section) +# +--------------- BLB1 2..1 (No restrictions for SPM or LPM accessing the Boot Loader section) diff --git a/doc/POWER.txt b/doc/POWER.txt new file mode 100644 index 000000000..0abbbe48e --- /dev/null +++ b/doc/POWER.txt @@ -0,0 +1,62 @@ +Time to Sleep +============= +USB suspend no activity on USB line for 3ms +No Interaction no user interaction + matrix has no change + matrix has no switch on + + +AVR Power Management +==================== + +V-USB suspend + USB suspend + http://vusb.wikidot.com/examples + +MCUSR MCU Status Register + WDRF Watchdog Reset Flag + BORF + EXTRF + PORF Power-on Reset Flag + +SMCR Sleep Mode Control Register + SE Sleep Enable + SM2:0 + #define set_sleep_mode(mode) \ + #define SLEEP_MODE_IDLE (0) + #define SLEEP_MODE_ADC _BV(SM0) + #define SLEEP_MODE_PWR_DOWN _BV(SM1) + #define SLEEP_MODE_PWR_SAVE (_BV(SM0) | _BV(SM1)) + #define SLEEP_MODE_STANDBY (_BV(SM1) | _BV(SM2)) + #define SLEEP_MODE_EXT_STANDBY (_BV(SM0) | _BV(SM1) | _BV(SM2)) + + +ACSR Analog Comparator Control and Status Register + To disable Analog Comparator + ACSR = 0x80; + or + ACSR &= ~_BV(ACIE); + ACSR |= _BV(ACD); + + ACD: Analog Comparator Disable + When this bit is written logic one, the power to the Analog Comparator is + switched off. This bit can be set at any time to turn off the Analog + Comparator. This will reduce power consumption in Active and Idle mode. + When changing the ACD bit, the Analog Comparator Interrupt must be disabled + by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when + the bit is changed. + +DIDR1 Digital Input Disable Register 1 + AIN1D + AIN0D + When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled. The corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is applied to the AIN1/0 pin and the digital input from this pin is not needed, this bit should be written logic one to reduce power consumption in the digital input buffer. + + +PRR Power Reduction Register + PRTWI + PRTIM2 + PRTIM0 + PRTIM1 + PRSPI + PRUSART0 + PRADC diff --git a/doc/USB_NKRO.txt b/doc/USB_NKRO.txt new file mode 100644 index 000000000..4751bca86 --- /dev/null +++ b/doc/USB_NKRO.txt @@ -0,0 +1,160 @@ +USB NKRO MEMO +============= +2010/12/09 + + +References +---------- +USB - boot mode, NKRO, compatibility, etc... + http://geekhack.org/showthread.php?t=13162 +NKey Rollover - Overview, Testing Methodology, and Results + http://geekhack.org/showwiki.php?title=NKey+Rollover+-+Overview+Testing+Methodology+and+Results +dfj's NKRO(2010/06) + http://geekhack.org/showpost.php?p=191195&postcount=251 + http://geekhack.org/showthread.php?p=204389#post204389 + + +Terminogy +--------- +NKRO +ghost +matrix +mechanical with diodes +membrane + + +OS Support Status +----------------- +USB NKRO is possible *without* a custom driver. +At least following OSes supports. + Windows7 64bit + WindowsXP + Windows2000 SP4 + Ubuntu10.4(Linux 2.6) + MacOSX(To be tested) + + +Custom Driver for USB NKRO +-------------------------- +NOT NEEDED +at least when using fllowing report formats on Windows, Linux or MacOSX. + + +USB NKRO methods +---------------- +1. Virtual keyboards + Keyboard can increase its KRO by using virtual keyboards with Standard or Extended report. + If the keyboard has 2 virtual keyboard with Standard report(6KRO), it gets 12KRO. + Using this method means the keyboard is a composite device. + +2. Exteded report + It needs large report size for this method to achive NKRO. + If a keyboard has 101keys, it needs 103byte report. It seems to be inefficient. + +3. Bitmap report + If the keyboard has less than 128keys, 16byte report will be enough for NKRO. + The 16byte report seems to be reasonable cost to get NKRO. + + +Report Format +------------- +Other report formats than followings are possible, though these format are typical one. + +1. Standard 8bytes + modifiers(bitmap) 1byte + reserved 1byte(not used) + keys(array) 1byte*6 +Standard report can send 6keys plus 8modifiers simultaneously. +Standard report is used by most keyboards in the marketplace. +Standard report is identical to boot protocol report. +Standard report is hard to suffer from compatibility problems. + +2. Extended standard 16,32,64bytes + modifiers(bitmap) 1byte + reserved 1byte(not used) + keys(array) 1byte*(14,32,62) +Extended report can send N-keys by using N+2bytes. +Extended report is expected to be compatible with boot protocol. + +3. Bitmap 16,32,64bytes + keys(bitmap) (16,32)bytes +Bitmap report can send at most 128keys by 16bytes and 256keys by 32bytes. +Bitmap report can achieve USB NKRO efficiently in terms of report size. +Bitmap report needs a deliberation for boot protocol implementation. +Bitmap report descriptor sample: + 0x05, 0x01, // Usage Page (Generic Desktop), + 0x09, 0x06, // Usage (Keyboard), + 0xA1, 0x01, // Collection (Application), + // bitmap of modifiers + 0x75, 0x01, // Report Size (1), + 0x95, 0x08, // Report Count (8), + 0x05, 0x07, // Usage Page (Key Codes), + 0x19, 0xE0, // Usage Minimum (224), + 0x29, 0xE7, // Usage Maximum (231), + 0x15, 0x00, // Logical Minimum (0), + 0x25, 0x01, // Logical Maximum (1), + 0x81, 0x02, // Input (Data, Variable, Absolute), ;Modifier byte + // LED output report + 0x95, 0x05, // Report Count (5), + 0x75, 0x01, // Report Size (1), + 0x05, 0x08, // Usage Page (LEDs), + 0x19, 0x01, // Usage Minimum (1), + 0x29, 0x05, // Usage Maximum (5), + 0x91, 0x02, // Output (Data, Variable, Absolute), + 0x95, 0x01, // Report Count (1), + 0x75, 0x03, // Report Size (3), + 0x91, 0x03, // Output (Constant), + // bitmap of keys + 0x95, (REPORT_BYTES-1)*8, // Report Count (), + 0x75, 0x01, // Report Size (1), + 0x15, 0x00, // Logical Minimum (0), + 0x25, 0x01, // Logical Maximum(1), + 0x05, 0x07, // Usage Page (Key Codes), + 0x19, 0x00, // Usage Minimum (0), + 0x29, (REPORT_BYTES-1)*8-1, // Usage Maximum (), + 0x81, 0x02, // Input (Data, Variable, Absolute), + 0xc0 // End Collection +where REPORT_BYTES is a report size in bytes. + + +Considerations +-------------- +Compatibility + boot protocol + minor/old system + Some BIOS doesn't send SET_PROTCOL request, a keyboard can't switch to boot protocol mode. + This may cuase a problem on a keyboard which uses other report than Standard. +Reactivity + USB polling time + OS/Driver processing time + + +Windows Problem +--------------- +1. Windows accepts only 6keys in case of Standard report. + It should be able to send 6keys plus 8modifiers. +2. Windows accepts only 10keys in case of 16bytes Extended report. + It should be able to send 14keys plus 8modifiers. +3. Windows accepts only 18keys in case of 32bytes Extended report. + It should be able to send 30keys plus 8modifiers. +If keys are pressed in excess of the number, wrong keys are registered on Windows. + +This problem will be reportedly fixed soon.(2010/12/05) + http://forums.anandtech.com/showpost.php?p=30873364&postcount=17 + + +Tools for testing NKRO +---------------------- +Browser App: +http://www.microsoft.com/appliedsciences/content/projects/KeyboardGhostingDemo.aspx +http://random.xem.us/rollover.html + +Windows: +AquaKeyTest.exe http://geekhack.org/showthread.php?t=6643 + +Linux: +xkeycaps +xev +showkeys + +EOF |