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Diffstat (limited to 'tmk_core/protocol/adb.c')
| -rw-r--r-- | tmk_core/protocol/adb.c | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/tmk_core/protocol/adb.c b/tmk_core/protocol/adb.c new file mode 100644 index 0000000000..bbff66df03 --- /dev/null +++ b/tmk_core/protocol/adb.c @@ -0,0 +1,456 @@ +/* +Copyright 2011 Jun WAKO <wakojun@gmail.com> +Copyright 2013 Shay Green <gblargg@gmail.com> + +This software is licensed with a Modified BSD License. +All of this is supposed to be Free Software, Open Source, DFSG-free, +GPL-compatible, and OK to use in both free and proprietary applications. +Additions and corrections to this file are welcome. + + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + +* Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + +* Neither the name of the copyright holders nor the names of + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +POSSIBILITY OF SUCH DAMAGE. +*/ + +#include <stdbool.h> +#include <util/delay.h> +#include <avr/io.h> +#include <avr/interrupt.h> +#include "adb.h" + + +// GCC doesn't inline functions normally +#define data_lo() (ADB_DDR |= (1<<ADB_DATA_BIT)) +#define data_hi() (ADB_DDR &= ~(1<<ADB_DATA_BIT)) +#define data_in() (ADB_PIN & (1<<ADB_DATA_BIT)) + +#ifdef ADB_PSW_BIT +static inline void psw_lo(void); +static inline void psw_hi(void); +static inline bool psw_in(void); +#endif + +static inline void attention(void); +static inline void place_bit0(void); +static inline void place_bit1(void); +static inline void send_byte(uint8_t data); +static inline uint16_t wait_data_lo(uint16_t us); +static inline uint16_t wait_data_hi(uint16_t us); + + +void adb_host_init(void) +{ + ADB_PORT &= ~(1<<ADB_DATA_BIT); + data_hi(); +#ifdef ADB_PSW_BIT + psw_hi(); +#endif +} + +#ifdef ADB_PSW_BIT +bool adb_host_psw(void) +{ + return psw_in(); +} +#endif + +/* + * Don't call this in a row without the delay, otherwise it makes some of poor controllers + * overloaded and misses strokes. Recommended interval is 12ms. + * + * Thanks a lot, blargg! + * <http://geekhack.org/index.php?topic=14290.msg1068919#msg1068919> + * <http://geekhack.org/index.php?topic=14290.msg1070139#msg1070139> + */ + +// ADB Bit Cells +// +// bit cell time: 70-130us +// low part of bit0: 60-70% of bit cell +// low part of bit1: 30-40% of bit cell +// +// bit cell time 70us 130us +// -------------------------------------------- +// low part of bit0 42-49 78-91 +// high part of bit0 21-28 39-52 +// low part of bit1 21-28 39-52 +// high part of bit1 42-49 78-91 +// +// +// bit0: +// 70us bit cell: +// ____________~~~~~~ +// 42-49 21-28 +// +// 130us bit cell: +// ____________~~~~~~ +// 78-91 39-52 +// +// bit1: +// 70us bit cell: +// ______~~~~~~~~~~~~ +// 21-28 42-49 +// +// 130us bit cell: +// ______~~~~~~~~~~~~ +// 39-52 78-91 +// +// [from Apple IIgs Hardware Reference Second Edition] + +uint16_t adb_host_kbd_recv(void) +{ + uint16_t data = 0; + cli(); + attention(); + send_byte(0x2C); // Addr:Keyboard(0010), Cmd:Talk(11), Register0(00) + place_bit0(); // Stopbit(0) + if (!wait_data_hi(500)) { // Service Request(310us Adjustable Keyboard): just ignored + sei(); + return -30; // something wrong + } + if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us) + sei(); + return 0; // No data to send + } + + uint8_t n = 17; // start bit + 16 data bits + do { + uint8_t lo = (uint8_t) wait_data_hi(130); + if (!lo) + goto error; + + uint8_t hi = (uint8_t) wait_data_lo(lo); + if (!hi) + goto error; + + hi = lo - hi; + lo = 130 - lo; + + data <<= 1; + if (lo < hi) { + data |= 1; + } + else if (n == 17) { + sei(); + return -20; + } + } + while ( --n ); + + // Stop bit can't be checked normally since it could have service request lenghtening + // and its high state never goes low. + if (!wait_data_hi(351) || wait_data_lo(91)) { + sei(); + return -21; + } + sei(); + return data; + +error: + sei(); + return -n; +} + +void adb_host_listen(uint8_t cmd, uint8_t data_h, uint8_t data_l) +{ + cli(); + attention(); + send_byte(cmd); + place_bit0(); // Stopbit(0) + _delay_us(200); // Tlt/Stop to Start + place_bit1(); // Startbit(1) + send_byte(data_h); + send_byte(data_l); + place_bit0(); // Stopbit(0); + sei(); +} + +// send state of LEDs +void adb_host_kbd_led(uint8_t led) +{ + // Addr:Keyboard(0010), Cmd:Listen(10), Register2(10) + // send upper byte (not used) + // send lower byte (bit2: ScrollLock, bit1: CapsLock, bit0: + adb_host_listen(0x2A,0,led&0x07); +} + + +#ifdef ADB_PSW_BIT +static inline void psw_lo() +{ + ADB_DDR |= (1<<ADB_PSW_BIT); + ADB_PORT &= ~(1<<ADB_PSW_BIT); +} +static inline void psw_hi() +{ + ADB_PORT |= (1<<ADB_PSW_BIT); + ADB_DDR &= ~(1<<ADB_PSW_BIT); +} +static inline bool psw_in() +{ + ADB_PORT |= (1<<ADB_PSW_BIT); + ADB_DDR &= ~(1<<ADB_PSW_BIT); + return ADB_PIN&(1<<ADB_PSW_BIT); +} +#endif + +static inline void attention(void) +{ + data_lo(); + _delay_us(800-35); // bit1 holds lo for 35 more + place_bit1(); +} + +static inline void place_bit0(void) +{ + data_lo(); + _delay_us(65); + data_hi(); + _delay_us(35); +} + +static inline void place_bit1(void) +{ + data_lo(); + _delay_us(35); + data_hi(); + _delay_us(65); +} + +static inline void send_byte(uint8_t data) +{ + for (int i = 0; i < 8; i++) { + if (data&(0x80>>i)) + place_bit1(); + else + place_bit0(); + } +} + +// These are carefully coded to take 6 cycles of overhead. +// inline asm approach became too convoluted +static inline uint16_t wait_data_lo(uint16_t us) +{ + do { + if ( !data_in() ) + break; + _delay_us(1 - (6 * 1000000.0 / F_CPU)); + } + while ( --us ); + return us; +} + +static inline uint16_t wait_data_hi(uint16_t us) +{ + do { + if ( data_in() ) + break; + _delay_us(1 - (6 * 1000000.0 / F_CPU)); + } + while ( --us ); + return us; +} + + +/* +ADB Protocol +============ + +Resources +--------- +ADB - The Untold Story: Space Aliens Ate My Mouse + http://developer.apple.com/legacy/mac/library/#technotes/hw/hw_01.html +ADB Manager + http://developer.apple.com/legacy/mac/library/documentation/mac/pdf/Devices/ADB_Manager.pdf + Service request(5-17) +Apple IIgs Hardware Reference Second Edition [Chapter6 p121] + ftp://ftp.apple.asimov.net/pub/apple_II/documentation/Apple%20IIgs%20Hardware%20Reference.pdf +ADB Keycode + http://72.0.193.250/Documentation/macppc/adbkeycodes/ + http://m0115.web.fc2.com/m0115.jpg + [Inside Macintosh volume V, pages 191-192] + http://www.opensource.apple.com/source/IOHIDFamily/IOHIDFamily-421.18.3/IOHIDFamily/Cosmo_USB2ADB.c +ADB Signaling + http://kbdbabel.sourceforge.net/doc/kbd_signaling_pcxt_ps2_adb.pdf +ADB Overview & History + http://en.wikipedia.org/wiki/Apple_Desktop_Bus +Microchip Application Note: ADB device(with code for PIC16C) + http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011062 +AVR ATtiny2131 ADB to PS/2 converter(Japanese) + http://hp.vector.co.jp/authors/VA000177/html/KeyBoardA5DEA5CBA5A2II.html + + +Pinouts +------- + ADB female socket from the front: + __________ + | | <--- top + | 4o o3 | + |2o o1| + | == | + |________| <--- bottom + | | <--- 4pins + + + ADB female socket from bottom: + + ========== <--- front + | | + | | + |2o o1| + |4o o3| + ---------- <--- back + + 1: Data + 2: Power SW(low when press Power key) + 3: Vcc(5V) + 4: GND + + +Commands +-------- + ADB command is 1byte and consists of 4bit-address, 2bit-command + type and 2bit-register. The commands are always sent by Host. + + Command format: + 7 6 5 4 3 2 1 0 + | | | |------------ address + | |-------- command type + | |---- register + + bits commands + ------------------------------------------------------ + - - - - 0 0 0 0 Send Request(reset all devices) + A A A A 0 0 0 1 Flush(reset a device) + - - - - 0 0 1 0 Reserved + - - - - 0 0 1 1 Reserved + - - - - 0 1 - - Reserved + A A A A 1 0 R R Listen(write to a device) + A A A A 1 1 R R Talk(read from a device) + + The command to read keycodes from keyboard is 0x2C which + consist of keyboard address 2 and Talk against register 0. + + Address: + 2: keyboard + 3: mice + + Registers: + 0: application(keyboard uses this to store its data.) + 1: application + 2: application(keyboard uses this for LEDs and state of modifiers) + 3: status and command + + +Communication +------------- + This is a minimum information for keyboard communication. + See "Resources" for detail. + + Signaling: + + ~~~~____________~~||||||||||||__~~~~~_~~|||||||||||||||__~~~~ + + |800us | |7 Command 0| | | |15-64 Data 0|Stopbit(0) + +Attention | | | +Startbit(1) + +Startbit(1) | +Tlt(140-260us) + +stopbit(0) + + Bit cells: + + bit0: ______~~~ + 65 :35us + + bit1: ___~~~~~~ + 35 :65us + + bit0 low time: 60-70% of bit cell(42-91us) + bit1 low time: 30-40% of bit cell(21-52us) + bit cell time: 70-130us + [from Apple IIgs Hardware Reference Second Edition] + + Criterion for bit0/1: + After 55us if line is low/high then bit is 0/1. + + Attention & start bit: + Host asserts low in 560-1040us then places start bit(1). + + Tlt(Stop to Start): + Bus stays high in 140-260us then device places start bit(1). + + Global reset: + Host asserts low in 2.8-5.2ms. All devices are forced to reset. + + Service request from device(Srq): + Device can request to send at commad(Global only?) stop bit. + Requesting device keeps low for 140-260us at stop bit of command. + + +Keyboard Data(Register0) + This 16bit data can contains two keycodes and two released flags. + First keycode is palced in upper byte. When one keyocode is sent, + lower byte is 0xFF. + Release flag is 1 when key is released. + + 1514 . . . . . 8 7 6 . . . . . 0 + | | | | | | | | | +-+-+-+-+-+-+- Keycode2 + | | | | | | | | +--------------- Released2(1 when the key is released) + | +-+-+-+-+-+-+----------------- Keycode1 + +------------------------------- Released1(1 when the key is released) + + Keycodes: + Scancode consists of 7bit keycode and 1bit release flag. + Device can send two keycodes at once. If just one keycode is sent + keycode1 contains it and keyocode2 is 0xFF. + + Power switch: + You can read the state from PSW line(active low) however + the switch has a special scancode 0x7F7F, so you can + also read from Data line. It uses 0xFFFF for release scancode. + +Keyboard LEDs & state of keys(Register2) + This register hold current state of three LEDs and nine keys. + The state of LEDs can be changed by sending Listen command. + + 1514 . . . . . . 7 6 5 . 3 2 1 0 + | | | | | | | | | | | | | | | +- LED1(NumLock) + | | | | | | | | | | | | | | +--- LED2(CapsLock) + | | | | | | | | | | | | | +----- LED3(ScrollLock) + | | | | | | | | | | +-+-+------- Reserved + | | | | | | | | | +------------- ScrollLock + | | | | | | | | +--------------- NumLock + | | | | | | | +----------------- Apple/Command + | | | | | | +------------------- Option + | | | | | +--------------------- Shift + | | | | +----------------------- Control + | | | +------------------------- Reset/Power + | | +--------------------------- CapsLock + | +----------------------------- Delete + +------------------------------- Reserved + +END_OF_ADB +*/ |