#include <stdbool.h>
#include <util/delay.h>
#include <avr/io.h>
+#include <avr/interrupt.h>
#include "adb.h"
static inline void send_byte(uint8_t data);
static inline bool read_bit(void);
static inline uint8_t read_byte(void);
-static inline uint8_t wait_data_lo(uint8_t us);
+static inline uint8_t wait_data_lo(uint16_t us);
static inline uint8_t wait_data_hi(uint8_t us);
#ifdef ADB_PSW_BIT
psw_hi();
#endif
+
+ // Enable keyboard left/right modifier distinction
+ // Addr:Keyboard(0010), Cmd:Listen(10), Register3(11)
+ // upper byte: reserved bits 0000, device address 0010
+ // lower byte: device handler 00000011
+ adb_host_listen(0x2B,0x02,0x03);
}
#ifdef ADB_PSW_BIT
attention();
send_byte(0x2C); // Addr:Keyboard(0010), Cmd:Talk(11), Register0(00)
place_bit0(); // Stopbit(0)
- if (!wait_data_lo(0xFF)) // Tlt/Stop to Start(140-260us)
+ if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us)
return 0; // No data to send
- if (!read_bit()) // Startbit(1)
+ }
+ if (!read_bit()) { // Startbit(1)
+ // Service Request
return -2;
+ }
+
+ // ad hoc fix: without block inerrupt read wrong bit occasionally and get keys stuck
+ cli();
data = read_byte();
data = (data<<8) | read_byte();
- if (read_bit()) // Stopbit(0)
+ uint8_t stop = read_bit(); // Stopbit(0)
+ sei();
+
+ if (stop) {
return -3;
+ }
return data;
}
-// send state of LEDs
-void adb_host_kbd_led(uint8_t led)
+void adb_host_listen(uint8_t cmd, uint8_t data_h, uint8_t data_l)
{
attention();
- send_byte(0x2A); // Addr:Keyboard(0010), Cmd:Listen(10), Register2(10)
+ send_byte(cmd);
place_bit0(); // Stopbit(0)
_delay_us(200); // Tlt/Stop to Start
place_bit1(); // Startbit(1)
- send_byte(0); // send upper byte (not used)
- send_byte(led&0x07); // send lower byte (bit2: ScrollLock, bit1: CapsLock, bit0: NumLock)
+ send_byte(data_h);
+ send_byte(data_l);
place_bit0(); // Stopbit(0);
}
+// 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);
+}
+
static inline void data_lo()
{
{
// ADB Bit Cells
//
- // bit0: ______~~~
- // 65 :35us
+ // 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
//
- // 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]
+ // bit0:
+ // 70us bit cell:
+ // ____________~~~~~~
+ // 42-49 21-28
//
- // After 55us if data line is low/high then bit is 0/1.
- // Too simple to rely on?
+ // 130us bit cell:
+ // ____________~~~~~~
+ // 78-91 39-52
+ //
+ // bit1:
+ // 70us bit cell:
+ // ______~~~~~~~~~~~~
+ // 21-28 42-49
+ //
+ // 130us bit cell:
+ // ______~~~~~~~~~~~~
+ // 39-52 78-91
+ //
+ // read:
+ // ________|~~~~~~~~~
+ // 55us
+ // Read data line after 55us. If data line is low/high then bit is 0/1.
+ // This method might not work at <90us bit cell time.
+ //
+ // [from Apple IIgs Hardware Reference Second Edition]
bool bit;
- wait_data_lo(75); // wait the beginning of bit cell
+ wait_data_lo(75); // wait the start of bit cell at least 130ms(55+0+75)
_delay_us(55);
bit = data_in();
- wait_data_hi(36); // wait high part of bit cell
+ wait_data_hi(36); // wait high part of bit cell at least 91ms(55+36)
return bit;
}
return data;
}
-static inline uint8_t wait_data_lo(uint8_t us)
+static inline uint8_t wait_data_lo(uint16_t us)
{
while (data_in() && us) {
_delay_us(1);
---------
ADB - The Untold Story: Space Aliens Ate My Mouse
http://developer.apple.com/legacy/mac/library/#technotes/hw/hw_01.html
-Apple IIgs Hardware Reference Second Edition [p80(Chapter6 p121)]
+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
Global reset:
Host asserts low in 2.8-5.2ms. All devices are forced to reset.
- Send request from device(Srq):
+ Service request from device(Srq):
Device can request to send at commad(Global only?) stop bit.
- keep low for 300us to request.
+ Requesting device keeps low for 140-260us at stop bit of command.
Keyboard Data(Register0)
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.
- Release code seems to delay about some 100ms. Due to Mac soft power?
Keyboard LEDs & state of keys(Register2)
This register hold current state of three LEDs and nine keys.
projects / tmk_firmware.git / blobdiff