ADB keyboard LEDs support
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ADB.txt
41
ADB.txt
@ -3,11 +3,14 @@ ADB Protocol
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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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@ -61,9 +64,9 @@ Commands
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3: mice
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Registers:
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0: application(keyobard/mice use to store its data.)
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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
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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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@ -111,15 +114,17 @@ Communication
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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 2 keycodes and 2 released flags.
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First keycode is palced in upper nibble. When one keyocode is sent,
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lower nibble is 0xFF.
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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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| |keycode1 | |keycode2
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|released(1) |released(1)
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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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@ -131,4 +136,24 @@ Keyboard data(register0)
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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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19
adb.c
19
adb.c
@ -42,9 +42,9 @@ 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:2, Cmd:talk(11), Reg:0(00)
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place_bit0(); // Stopbit
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if (!wait_data_lo(0xFF)) // Stop to Start(140-260us)
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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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@ -55,6 +55,19 @@ uint16_t adb_host_kbd_recv(void)
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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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1
adb.h
1
adb.h
@ -14,5 +14,6 @@
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void adb_host_init(void);
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bool adb_host_psw(void);
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uint16_t adb_host_kbd_recv(void);
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void adb_host_kbd_led(uint8_t led);
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#endif
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@ -1,8 +1,10 @@
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ADB to USB keyboard converter
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=============================
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http://geekhack.org/showwiki.php?title=Island:14290
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This firmware converts ADB keyboard protocol to USB.
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Build
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-----
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0. Connect ADB keyboard to Teensy by 3 lines(Vcc, GND, Data).
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@ -9,6 +9,7 @@
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#include "util.h"
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#include "debug.h"
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#include "adb.h"
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#include "usb_keyboard.h"
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#include "matrix_skel.h"
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@ -71,8 +72,13 @@ uint8_t matrix_scan(void)
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uint16_t codes;
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uint8_t key0, key1;
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_matrix_is_modified = false;
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static uint8_t prev_led = 0;
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if (prev_led != usb_keyboard_leds) {
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adb_host_kbd_led(~usb_keyboard_leds);
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prev_led = usb_keyboard_leds;
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}
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_matrix_is_modified = false;
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codes = adb_host_kbd_recv();
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key0 = codes>>8;
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key1 = codes&0xFF;
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