532 lines
17 KiB
C
532 lines
17 KiB
C
/*
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Copyright 2011-19 Jun WAKO <wakojun@gmail.com>
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Copyright 2013 Shay Green <gblargg@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 <avr/interrupt.h>
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#include "adb.h"
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#include "print.h"
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// GCC doesn't inline functions normally
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#define data_lo() (ADB_DDR |= (1 << ADB_DATA_BIT))
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#define data_hi() (ADB_DDR &= ~(1 << ADB_DATA_BIT))
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#define data_in() (ADB_PIN & (1 << ADB_DATA_BIT))
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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 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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void adb_host_init(void) {
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ADB_PORT &= ~(1 << ADB_DATA_BIT);
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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) { return psw_in(); }
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#endif
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/*
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* Don't call this in a row without the delay, otherwise it makes some of poor controllers
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* overloaded and misses strokes. Recommended interval is 12ms.
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*
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* Thanks a lot, blargg!
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* <http://geekhack.org/index.php?topic=14290.msg1068919#msg1068919>
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* <http://geekhack.org/index.php?topic=14290.msg1070139#msg1070139>
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*/
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uint16_t adb_host_kbd_recv(void) { return adb_host_talk(ADB_ADDR_KEYBOARD, ADB_REG_0); }
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#ifdef ADB_MOUSE_ENABLE
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uint16_t adb_host_mouse_recv(void) { return adb_host_talk(ADB_ADDR_MOUSE, ADB_REG_0); }
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#endif
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// This sends Talk command to read data from register and returns length of the data.
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uint8_t adb_host_talk_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len) {
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for (int8_t i = 0; i < len; i++) buf[i] = 0;
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cli();
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attention();
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send_byte((addr << 4) | ADB_CMD_TALK | reg);
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place_bit0(); // Stopbit(0)
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// TODO: Service Request(Srq):
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// Device holds low part of comannd stopbit for 140-260us
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//
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// Command:
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// ......._ ______________________ ___ ............_ -------
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// | | | | | | |
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// Command | | | | | Data bytes | |
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// ........|___| | 140-260 |__| |_............|___|
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// |stop0 | Tlt Stop-to-Start |start1| |stop0 |
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//
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// Command without data:
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// ......._ __________________________
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// | |
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// Command | |
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// ........|___| | 140-260 |
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// |stop0 | Tlt Stop-to-Start |
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//
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// Service Request:
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// ......._ ______ ___ ............_ -------
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// | 140-260 | | | | | |
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// Command | Service Request | | | | Data bytes | |
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// ........|___________________| |__| |_............|___|
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// |stop0 | |start1| |stop0 |
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// ......._ __________
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// | 140-260 |
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// Command | Service Request |
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// ........|___________________|
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// |stop0 |
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// This can be happened?
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// ......._ ______________________ ___ ............_ -----
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// | | | | | | 140-260 |
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// Command | | | | | Data bytes | Service Request |
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// ........|___| | 140-260 |__| |_............|_________________|
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// |stop0 | Tlt Stop-to-Start |start1| |stop0 |
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//
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// "Service requests are issued by the devices during a very specific time at the
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// end of the reception of the command packet.
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// If a device in need of service issues a service request, it must do so within
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// the 65 µs of the Stop Bit’s low time and maintain the line low for a total of 300 µs."
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//
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// "A device sends a Service Request signal by holding the bus low during the low
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// portion of the stop bit of any command or data transaction. The device must lengthen
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// the stop by a minimum of 140 J.lS beyond its normal duration, as shown in Figure 8-15."
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// http://ww1.microchip.com/downloads/en/AppNotes/00591b.pdf
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if (!wait_data_hi(500)) { // Service Request(310us Adjustable Keyboard): just ignored
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xprintf("R");
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sei();
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return 0;
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}
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if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us)
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sei();
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return 0; // No data from device(not error);
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}
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// start bit(1)
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if (!wait_data_hi(40)) {
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xprintf("S");
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sei();
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return 0;
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}
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if (!wait_data_lo(100)) {
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xprintf("s");
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sei();
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return 0;
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}
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uint8_t n = 0; // bit count
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do {
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//
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// |<- bit_cell_max(130) ->|
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// | |<- lo ->|
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// | | |<-hi->|
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// _______
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// | | |
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// | 130-lo | lo-hi |
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// |________| |
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//
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uint8_t lo = (uint8_t)wait_data_hi(130);
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if (!lo) goto error; // no more bit or after stop bit
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uint8_t hi = (uint8_t)wait_data_lo(lo);
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if (!hi) goto error; // stop bit extedned by Srq?
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if (n / 8 >= len) continue; // can't store in buf
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buf[n / 8] <<= 1;
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if ((130 - lo) < (lo - hi)) {
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buf[n / 8] |= 1;
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}
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} while (++n);
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error:
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sei();
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return n / 8;
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}
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uint16_t adb_host_talk(uint8_t addr, uint8_t reg) {
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uint8_t len;
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uint8_t buf[8];
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len = adb_host_talk_buf(addr, reg, buf, 8);
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if (len != 2) return 0;
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return (buf[0] << 8 | buf[1]);
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}
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void adb_host_listen_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len) {
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cli();
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attention();
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send_byte((addr << 4) | ADB_CMD_LISTEN | reg);
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place_bit0(); // Stopbit(0)
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// TODO: Service Request
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_delay_us(200); // Tlt/Stop to Start
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place_bit1(); // Startbit(1)
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for (int8_t i = 0; i < len; i++) {
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send_byte(buf[i]);
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// xprintf("%02X ", buf[i]);
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}
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place_bit0(); // Stopbit(0);
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sei();
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}
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void adb_host_listen(uint8_t addr, uint8_t reg, uint8_t data_h, uint8_t data_l) {
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uint8_t buf[2] = {data_h, data_l};
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adb_host_listen_buf(addr, reg, buf, 2);
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}
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void adb_host_flush(uint8_t addr) {
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cli();
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attention();
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send_byte((addr << 4) | ADB_CMD_FLUSH);
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place_bit0(); // Stopbit(0)
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_delay_us(200); // Tlt/Stop to Start
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sei();
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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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// Listen Register2
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// upper byte: not used
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// lower byte: bit2=ScrollLock, bit1=CapsLock, bit0=NumLock
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adb_host_listen(ADB_ADDR_KEYBOARD, ADB_REG_2, 0, led & 0x07);
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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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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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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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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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data_lo();
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_delay_us(800 - 35); // bit1 holds lo for 35 more
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place_bit1();
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}
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static inline void place_bit0(void) {
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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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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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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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// These are carefully coded to take 6 cycles of overhead.
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// inline asm approach became too convoluted
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static inline uint16_t wait_data_lo(uint16_t us) {
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do {
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if (!data_in()) break;
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_delay_us(1 - (6 * 1000000.0 / F_CPU));
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} while (--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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do {
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if (data_in()) break;
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_delay_us(1 - (6 * 1000000.0 / F_CPU));
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} while (--us);
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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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ADB Manager
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http://developer.apple.com/legacy/mac/library/documentation/mac/pdf/Devices/ADB_Manager.pdf
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Service request(5-17)
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Apple IIgs Hardware Reference Second Edition [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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http://www.opensource.apple.com/source/IOHIDFamily/IOHIDFamily-421.18.3/IOHIDFamily/Cosmo_USB2ADB.c
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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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| |
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| |
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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 Reset(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(keyboard 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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Service request from device(Srq):
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Device can request to send at commad(Global only?) stop bit.
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Requesting device keeps low for 140-260us at stop bit of command.
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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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Address, Handler ID and bits(Register3)
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1514131211 . . 8 7 . . . . . . 0
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| | | | | | | | | | | | | | | |
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| | | | | | | | +-+-+-+-+-+-+-+- Handler ID
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| | | | +-+-+-+----------------- Address
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| | | +------------------------- 0
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| | +--------------------------- Service request enable(1 = enabled)
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| +----------------------------- Exceptional event(alwyas 1 if not used)
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+------------------------------- 0
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ADB Bit Cells
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bit cell time: 70-130us
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low part of bit0: 60-70% of bit cell
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low part of bit1: 30-40% of bit cell
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bit cell time 70us 130us
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--------------------------------------------
|
||
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]
|
||
|
||
Keyboard Handle ID
|
||
Apple Standard Keyboard M0116: 0x01
|
||
Apple Extended Keyboard M0115: 0x02
|
||
Apple Extended Keyboard II M3501: 0x02
|
||
Apple Adjustable Keybaord: 0x10
|
||
|
||
http://lxr.free-electrons.com/source/drivers/macintosh/adbhid.c?v=4.4#L802
|
||
|
||
END_OF_ADB
|
||
*/
|