307 lines
9.0 KiB
C
307 lines
9.0 KiB
C
/*
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Copyright 2011 Jun WAKO <wakojun@gmail.com>
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This software is licensed with a Modified BSD License.
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All of this is supposed to be Free Software, Open Source, DFSG-free,
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GPL-compatible, and OK to use in both free and proprietary applications.
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Additions and corrections to this file are welcome.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdbool.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include "m0110.h"
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#include "debug.h"
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static inline void clock_lo(void);
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static inline void clock_hi(void);
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static inline bool clock_in(void);
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static inline void data_lo(void);
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static inline void data_hi(void);
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static inline bool data_in(void);
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static inline uint16_t wait_clock_lo(uint16_t us);
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static inline uint16_t wait_clock_hi(uint16_t us);
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static inline uint16_t wait_data_lo(uint16_t us);
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static inline uint16_t wait_data_hi(uint16_t us);
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static inline void idle(void);
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static inline void request(void);
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/*
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Primitive M0110 Library for AVR
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==============================
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Signaling
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---------
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CLOCK is always from KEYBOARD. DATA are sent with MSB first.
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1) IDLE: both line is high.
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CLOCK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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DATA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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2) KEYBOARD->HOST: HOST reads bit on rising edge.
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CLOCK ~~~~~~~~~~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~~~~~~~~~
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DATA ~~~~~~~~~~~~X777777X666666X555555X444444X333333X222222X111111X000000X~~~~~~~
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<--> 160us(clock low)
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<---> 180us(clock high)
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3) HOST->KEYBOARD: HOST asserts bit on falling edge.
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CLOCK ~~~~~~~~~~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~|__|~~~~~~~~~~~
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DATA ~~~~~~|_____X777777X666666X555555X444444X333333X222222X111111X000000X~~~~~~~
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<----> 840us(request to send by host) <-> 80us(hold DATA)
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<--> 180us(clock low)
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<---> 220us(clock high)
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Protocol
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--------
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COMMAND:
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Inquiry 0x10 get key event
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Instant 0x12 get key event
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Model 0x14 get model number(M0110 responds with 0x09)
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bit 7 1 if another device connected(used when keypad exists?)
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bit4-6 next device model number
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bit1-3 keyboard model number
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bit 0 always 1
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Test 0x16 test(ACK:0x7D/NAK:0x77)
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KEY EVENT:
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bit 7 key state(0:press 1:release)
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bit 6-1 scan code
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bit 0 always 1
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To get scan code, use ((bits&(1<<7)) | ((bits&7F))>>1).
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SCAN CODE:
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M0110
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,---------------------------------------------------------.
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| `| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|Backs|
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|---------------------------------------------------------|
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|Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| \|
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|---------------------------------------------------------|
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|CapsLo| A| S| D| F| G| H| J| K| L| ;| '|Return|
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|---------------------------------------------------------|
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|Shift | Z| X| C| V| B| N| M| ,| ,| /| |
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`---------------------------------------------------------'
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|Opt|Mac | Space |Enter|Opt|
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`------------------------------------------------'
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,---------------------------------------------------------.
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| 32| 12| 13| 14| 15| 17| 16| 1A| 1C| 19| 1D| 1B| 18| 33|
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|---------------------------------------------------------|
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| 30| 0C| 0D| 0E| 0F| 10| 11| 20| 22| 1F| 23| 21| 1E| 2A|
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|---------------------------------------------------------|
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| 39| 00| 01| 02| 03| 05| 04| 26| 28| 25| 29| 27| 24|
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|---------------------------------------------------------|
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| 38| 06| 07| 08| 09| 0B| 2D| 2E| 2B| 2F| 2C| 38|
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`---------------------------------------------------------'
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| 3A| 37| 31 | 34| 3A|
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`------------------------------------------------'
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References
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----------
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Protocol:
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http://www.mac.linux-m68k.org/devel/plushw.php
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Connector:
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http://www.kbdbabel.org/conn/kbd_connector_macplus.png
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Signaling:
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http://www.kbdbabel.org/signaling/kbd_signaling_mac.png
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http://typematic.blog.shinobi.jp/Entry/14/
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Scan Codes:
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http://m0115.web.fc2.com/m0110.jpg
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http://m0115.web.fc2.com/m0110a.jpg
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*/
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#define WAIT(stat, us, err) do { \
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if (!wait_##stat(us)) { \
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m0110_error = err; \
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goto ERROR; \
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} \
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} while (0)
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uint8_t m0110_error = 0;
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void m0110_init(void)
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{
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uint8_t data;
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idle();
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_delay_ms(255);
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m0110_send(M0110_MODLE);
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data = m0110_recv();
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print("m0110_init model: "); phex(data); print("\n");
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m0110_send(M0110_TEST);
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data = m0110_recv();
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print("m0110_init test: "); phex(data); print("\n");
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}
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uint8_t m0110_send(uint8_t data)
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{
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m0110_error = 0;
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request();
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WAIT(clock_lo, 1000, 0);
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for (uint8_t bit = 0x80; bit; bit >>= 1) {
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WAIT(clock_lo, 250, 3);
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_delay_us(15);
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if (data&bit) {
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data_hi();
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} else {
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data_lo();
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}
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WAIT(clock_hi, 200, 4);
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}
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_delay_us(100); // hold last bit for 80us
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idle();
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return 1;
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ERROR:
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if (m0110_error) {
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print("m0110_send err: "); phex(m0110_error); print("\n");
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}
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idle();
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return 0;
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}
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uint8_t m0110_recv(void)
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{
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uint8_t data = 0;
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m0110_error = 0;
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WAIT(clock_lo, -1, 0); // need 250ms? insted 0xffff(16bit max)us
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for (uint8_t i = 0; i < 8; i++) {
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data <<= 1;
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WAIT(clock_lo, 200, 2);
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WAIT(clock_hi, 200, 3);
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if (data_in()) {
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data |= 1;
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}
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}
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idle();
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if (data != M0110_NULL) {
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print("m0110_recv data: "); phex(data); print("\n");
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}
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return data;
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ERROR:
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if (m0110_error) {
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print("m0110_recv err: "); phex(m0110_error); print("\n");
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}
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idle();
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return 0xFF;
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}
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uint8_t m0110_recv_key(void)
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{
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uint8_t key;
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m0110_send(M0110_INQUIRY);
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key = m0110_recv();
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if (key == 0xFF || key == M0110_NULL)
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return M0110_NULL;
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else
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return ((key&(1<<7)) | ((key&0x7F)>>1));
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}
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static inline void clock_lo()
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{
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M0110_CLOCK_PORT &= ~(1<<M0110_CLOCK_BIT);
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M0110_CLOCK_DDR |= (1<<M0110_CLOCK_BIT);
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}
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static inline void clock_hi()
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{
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/* input with pull up */
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M0110_CLOCK_DDR &= ~(1<<M0110_CLOCK_BIT);
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M0110_CLOCK_PORT |= (1<<M0110_CLOCK_BIT);
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}
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static inline bool clock_in()
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{
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M0110_CLOCK_DDR &= ~(1<<M0110_CLOCK_BIT);
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M0110_CLOCK_PORT |= (1<<M0110_CLOCK_BIT);
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_delay_us(1);
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return M0110_CLOCK_PIN&(1<<M0110_CLOCK_BIT);
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}
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static inline void data_lo()
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{
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M0110_DATA_PORT &= ~(1<<M0110_DATA_BIT);
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M0110_DATA_DDR |= (1<<M0110_DATA_BIT);
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}
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static inline void data_hi()
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{
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/* input with pull up */
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M0110_DATA_DDR &= ~(1<<M0110_DATA_BIT);
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M0110_DATA_PORT |= (1<<M0110_DATA_BIT);
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}
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static inline bool data_in()
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{
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M0110_DATA_DDR &= ~(1<<M0110_DATA_BIT);
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M0110_DATA_PORT |= (1<<M0110_DATA_BIT);
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_delay_us(1);
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return M0110_DATA_PIN&(1<<M0110_DATA_BIT);
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}
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static inline uint16_t wait_clock_lo(uint16_t us)
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{
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while (clock_in() && us) { asm(""); _delay_us(1); us--; }
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return us;
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}
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static inline uint16_t wait_clock_hi(uint16_t us)
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{
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while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
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return us;
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}
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static inline uint16_t wait_data_lo(uint16_t us)
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{
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while (data_in() && us) { asm(""); _delay_us(1); us--; }
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return us;
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}
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static inline uint16_t wait_data_hi(uint16_t us)
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{
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while (!data_in() && us) { asm(""); _delay_us(1); us--; }
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return us;
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}
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static inline void idle(void)
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{
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clock_hi();
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data_hi();
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}
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static inline void request(void)
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{
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clock_hi();
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data_lo();
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}
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