forked from mirrors/qmk_firmware
439 lines
13 KiB
C
439 lines
13 KiB
C
/*
|
|
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);
|
|
static inline uint16_t adb_host_dev_recv(uint8_t device);
|
|
|
|
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]
|
|
|
|
enum { ADDR_KEYB = 0x20, ADDR_MOUSE = 0x30 };
|
|
|
|
uint16_t adb_host_kbd_recv(void) { return adb_host_dev_recv(ADDR_KEYB); }
|
|
|
|
#ifdef ADB_MOUSE_ENABLE
|
|
void adb_mouse_init(void) { return; }
|
|
|
|
uint16_t adb_host_mouse_recv(void) { return adb_host_dev_recv(ADDR_MOUSE); }
|
|
#endif
|
|
|
|
static inline uint16_t adb_host_dev_recv(uint8_t device) {
|
|
uint16_t data = 0;
|
|
cli();
|
|
attention();
|
|
send_byte(device | 0x0C); // Addr:Keyboard(0010)/Mouse(0011), 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
|
|
*/
|