407 lines
11 KiB
C
407 lines
11 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 <util/delay.h>
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#include <avr/io.h>
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#include "adb.h"
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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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#ifdef ADB_PSW_BIT
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static inline void psw_lo(void);
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static inline void psw_hi(void);
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static inline bool psw_in(void);
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#endif
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static inline void attention(void);
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static inline void place_bit0(void);
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static inline void place_bit1(void);
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static inline void send_byte(uint8_t data);
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static inline bool read_bit(void);
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static inline uint8_t read_byte(void);
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static inline uint8_t wait_data_lo(uint8_t us);
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static inline uint8_t wait_data_hi(uint8_t us);
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void adb_host_init(void)
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{
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data_hi();
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#ifdef ADB_PSW_BIT
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psw_hi();
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#endif
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}
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#ifdef ADB_PSW_BIT
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bool adb_host_psw(void)
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{
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return psw_in();
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}
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#endif
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uint16_t adb_host_kbd_recv(void)
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{
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uint16_t data = 0;
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attention();
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send_byte(0x2C); // Addr:Keyboard(0010), Cmd:Talk(11), Register0(00)
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place_bit0(); // Stopbit(0)
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if (!wait_data_lo(0xFF)) // Tlt/Stop to Start(140-260us)
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return 0; // No data to send
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if (!read_bit()) // Startbit(1)
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return -2;
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data = read_byte();
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data = (data<<8) | read_byte();
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if (read_bit()) // Stopbit(0)
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return -3;
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return data;
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}
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// send state of LEDs
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void adb_host_kbd_led(uint8_t led)
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{
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attention();
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send_byte(0x2A); // Addr:Keyboard(0010), Cmd:Listen(10), Register2(10)
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place_bit0(); // Stopbit(0)
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_delay_us(200); // Tlt/Stop to Start
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place_bit1(); // Startbit(1)
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send_byte(0); // send upper byte (not used)
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send_byte(led&0x07); // send lower byte (bit2: ScrollLock, bit1: CapsLock, bit0: NumLock)
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place_bit0(); // Stopbit(0);
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}
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static inline void data_lo()
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{
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ADB_DDR |= (1<<ADB_DATA_BIT);
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ADB_PORT &= ~(1<<ADB_DATA_BIT);
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}
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static inline void data_hi()
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{
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ADB_PORT |= (1<<ADB_DATA_BIT);
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ADB_DDR &= ~(1<<ADB_DATA_BIT);
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}
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static inline bool data_in()
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{
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ADB_PORT |= (1<<ADB_DATA_BIT);
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ADB_DDR &= ~(1<<ADB_DATA_BIT);
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return ADB_PIN&(1<<ADB_DATA_BIT);
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}
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#ifdef ADB_PSW_BIT
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static inline void psw_lo()
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{
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ADB_DDR |= (1<<ADB_PSW_BIT);
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ADB_PORT &= ~(1<<ADB_PSW_BIT);
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}
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static inline void psw_hi()
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{
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ADB_PORT |= (1<<ADB_PSW_BIT);
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ADB_DDR &= ~(1<<ADB_PSW_BIT);
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}
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static inline bool psw_in()
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{
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ADB_PORT |= (1<<ADB_PSW_BIT);
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ADB_DDR &= ~(1<<ADB_PSW_BIT);
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return ADB_PIN&(1<<ADB_PSW_BIT);
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}
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#endif
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static inline void attention(void)
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{
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data_lo();
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_delay_us(700);
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place_bit1();
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}
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static inline void place_bit0(void)
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{
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data_lo();
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_delay_us(65);
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data_hi();
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_delay_us(35);
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}
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static inline void place_bit1(void)
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{
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data_lo();
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_delay_us(35);
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data_hi();
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_delay_us(65);
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}
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static inline void send_byte(uint8_t data)
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{
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for (int i = 0; i < 8; i++) {
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if (data&(0x80>>i))
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place_bit1();
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else
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place_bit0();
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}
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}
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static inline bool read_bit(void)
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{
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// ADB Bit Cells
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//
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// bit0: ______~~~
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// 65 :35us
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//
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// bit1: ___~~~~~~
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// 35 :65us
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//
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// bit0 low time: 60-70% of bit cell(42-91us)
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// bit1 low time: 30-40% of bit cell(21-52us)
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// bit cell time: 70-130us
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// [from Apple IIgs Hardware Reference Second Edition]
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//
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// After 55us if data line is low/high then bit is 0/1.
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// Too simple to rely on?
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bool bit;
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wait_data_lo(75); // wait the beginning of bit cell
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_delay_us(55);
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bit = data_in();
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wait_data_hi(36); // wait high part of bit cell
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return bit;
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}
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static inline uint8_t read_byte(void)
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{
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uint8_t data = 0;
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for (int i = 0; i < 8; i++) {
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data <<= 1;
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if (read_bit())
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data = data | 1;
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}
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return data;
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}
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static inline uint8_t wait_data_lo(uint8_t us)
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{
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while (data_in() && us) {
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_delay_us(1);
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us--;
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}
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return us;
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}
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static inline uint8_t wait_data_hi(uint8_t us)
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{
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while (!data_in() && us) {
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_delay_us(1);
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us--;
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}
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return us;
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}
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/*
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ADB Protocol
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============
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Resources
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---------
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ADB - The Untold Story: Space Aliens Ate My Mouse
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http://developer.apple.com/legacy/mac/library/#technotes/hw/hw_01.html
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Apple IIgs Hardware Reference Second Edition [p80(Chapter6 p121)]
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ftp://ftp.apple.asimov.net/pub/apple_II/documentation/Apple%20IIgs%20Hardware%20Reference.pdf
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ADB Keycode
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http://72.0.193.250/Documentation/macppc/adbkeycodes/
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http://m0115.web.fc2.com/m0115.jpg
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[Inside Macintosh volume V, pages 191-192]
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ADB Signaling
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http://kbdbabel.sourceforge.net/doc/kbd_signaling_pcxt_ps2_adb.pdf
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ADB Overview & History
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http://en.wikipedia.org/wiki/Apple_Desktop_Bus
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Microchip Application Note: ADB device(with code for PIC16C)
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http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011062
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AVR ATtiny2131 ADB to PS/2 converter(Japanese)
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http://hp.vector.co.jp/authors/VA000177/html/KeyBoardA5DEA5CBA5A2II.html
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Pinouts
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-------
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ADB female socket from the front:
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__________
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| | <--- top
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| 4o o3 |
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|2o o1|
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| == |
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|________| <--- bottom
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| | <--- 4pins
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ADB female socket from bottom:
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========== <--- front
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|2o o1|
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|4o o3|
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---------- <--- back
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1: Data
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2: Power SW(low when press Power key)
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3: Vcc(5V)
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4: GND
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Commands
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--------
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ADB command is 1byte and consists of 4bit-address, 2bit-command
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type and 2bit-register. The commands are always sent by Host.
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Command format:
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7 6 5 4 3 2 1 0
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| | | |------------ address
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| |-------- command type
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| |---- register
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bits commands
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------------------------------------------------------
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- - - - 0 0 0 0 Send Request(reset all devices)
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A A A A 0 0 0 1 Flush(reset a device)
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- - - - 0 0 1 0 Reserved
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- - - - 0 0 1 1 Reserved
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- - - - 0 1 - - Reserved
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A A A A 1 0 R R Listen(write to a device)
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A A A A 1 1 R R Talk(read from a device)
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The command to read keycodes from keyboard is 0x2C which
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consist of keyboard address 2 and Talk against register 0.
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Address:
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2: keyboard
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3: mice
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Registers:
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0: application(keyobard uses this to store its data.)
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1: application
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2: application(keyboard uses this for LEDs and state of modifiers)
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3: status and command
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Communication
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-------------
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This is a minimum information for keyboard communication.
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See "Resources" for detail.
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Signaling:
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~~~~____________~~||||||||||||__~~~~~_~~|||||||||||||||__~~~~
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|800us | |7 Command 0| | | |15-64 Data 0|Stopbit(0)
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+Attention | | | +Startbit(1)
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+Startbit(1) | +Tlt(140-260us)
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+stopbit(0)
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Bit cells:
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bit0: ______~~~
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65 :35us
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bit1: ___~~~~~~
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35 :65us
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bit0 low time: 60-70% of bit cell(42-91us)
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bit1 low time: 30-40% of bit cell(21-52us)
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bit cell time: 70-130us
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[from Apple IIgs Hardware Reference Second Edition]
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Criterion for bit0/1:
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After 55us if line is low/high then bit is 0/1.
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Attention & start bit:
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Host asserts low in 560-1040us then places start bit(1).
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Tlt(Stop to Start):
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Bus stays high in 140-260us then device places start bit(1).
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Global reset:
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Host asserts low in 2.8-5.2ms. All devices are forced to reset.
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Send request from device(Srq):
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Device can request to send at commad(Global only?) stop bit.
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keep low for 300us to request.
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Keyboard Data(Register0)
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This 16bit data can contains two keycodes and two released flags.
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First keycode is palced in upper byte. When one keyocode is sent,
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lower byte is 0xFF.
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Release flag is 1 when key is released.
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1514 . . . . . 8 7 6 . . . . . 0
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| | | | | | | | | +-+-+-+-+-+-+- Keycode2
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| | | | | | | | +--------------- Released2(1 when the key is released)
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| +-+-+-+-+-+-+----------------- Keycode1
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+------------------------------- Released1(1 when the key is released)
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Keycodes:
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Scancode consists of 7bit keycode and 1bit release flag.
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Device can send two keycodes at once. If just one keycode is sent
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keycode1 contains it and keyocode2 is 0xFF.
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Power switch:
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You can read the state from PSW line(active low) however
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the switch has a special scancode 0x7F7F, so you can
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also read from Data line. It uses 0xFFFF for release scancode.
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Keyboard LEDs & state of keys(Register2)
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This register hold current state of three LEDs and nine keys.
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The state of LEDs can be changed by sending Listen command.
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1514 . . . . . . 7 6 5 . 3 2 1 0
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| | | | | | | | | | | | | | | +- LED1(NumLock)
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| | | | | | | | | | | | | | +--- LED2(CapsLock)
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| | | | | | | | | | | | | +----- LED3(ScrollLock)
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| | | | | | | | | | +-+-+------- Reserved
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| | | | | | | | | +------------- ScrollLock
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| | | | | | | | +--------------- NumLock
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| | | | | | | +----------------- Apple/Command
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| | | | | | +------------------- Option
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| | | | | +--------------------- Shift
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| | | | +----------------------- Control
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| | | +------------------------- Reset/Power
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| | +--------------------------- CapsLock
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| +----------------------------- Delete
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+------------------------------- Reserved
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END_OF_ADB
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*/
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