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Update ADB impelemtation in TMK Core #11168

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merged 4 commits into from
Dec 30, 2020
Merged

Update ADB impelemtation in TMK Core #11168

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2613242
Update ADB impelmentation in tmk_core to recent version.
siggie0815 Dec 9, 2020
24ea3ac
Restore convenient ADB functions used in QMK port.
siggie0815 Dec 9, 2020
530744f
Do cformat.
siggie0815 Dec 11, 2020
5a8a18c
Merge branch 'develop' into update_adb
siggie0815 Dec 28, 2020
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256 changes: 176 additions & 80 deletions tmk_core/protocol/adb.c
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
Copyright 2011 Jun WAKO <[email protected]>
Copyright 2011-19 Jun WAKO <[email protected]>
Copyright 2013 Shay Green <[email protected]>

This software is licensed with a Modified BSD License.
Expand Down Expand Up @@ -41,6 +41,7 @@ POSSIBILITY OF SUCH DAMAGE.
#include <avr/io.h>
#include <avr/interrupt.h>
#include "adb.h"
#include "print.h"

// GCC doesn't inline functions normally
#define data_lo() (ADB_DDR |= (1 << ADB_DATA_BIT))
Expand All @@ -59,7 +60,6 @@ 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);
Expand All @@ -81,119 +81,164 @@ bool adb_host_psw(void) { return psw_in(); }
* <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); }
uint16_t adb_host_kbd_recv(void) { return adb_host_talk(ADB_ADDR_KEYBOARD, ADB_REG_0); }

#ifdef ADB_MOUSE_ENABLE
void adb_mouse_init(void) { return; }
__attribute__((weak)) void adb_mouse_init(void) { return; }

__attribute__((weak)) void adb_mouse_task(void) { return; }

uint16_t adb_host_mouse_recv(void) { return adb_host_dev_recv(ADDR_MOUSE); }
uint16_t adb_host_mouse_recv(void) { return adb_host_talk(ADB_ADDR_MOUSE, ADB_REG_0); }
#endif

static inline uint16_t adb_host_dev_recv(uint8_t device) {
uint16_t data = 0;
// This sends Talk command to read data from register and returns length of the data.
uint8_t adb_host_talk_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len) {
for (int8_t i = 0; i < len; i++) buf[i] = 0;

cli();
attention();
send_byte(device | 0x0C); // Addr:Keyboard(0010)/Mouse(0011), Cmd:Talk(11), Register0(00)
place_bit0(); // Stopbit(0)
send_byte((addr << 4) | ADB_CMD_TALK | reg);
place_bit0(); // Stopbit(0)
// TODO: Service Request(Srq):
// Device holds low part of comannd stopbit for 140-260us
//
// Command:
// ......._ ______________________ ___ ............_ -------
// | | | | | | |
// Command | | | | | Data bytes | |
// ........|___| | 140-260 |__| |_............|___|
// |stop0 | Tlt Stop-to-Start |start1| |stop0 |
//
// Command without data:
// ......._ __________________________
// | |
// Command | |
// ........|___| | 140-260 |
// |stop0 | Tlt Stop-to-Start |
//
// Service Request:
// ......._ ______ ___ ............_ -------
// | 140-260 | | | | | |
// Command | Service Request | | | | Data bytes | |
// ........|___________________| |__| |_............|___|
// |stop0 | |start1| |stop0 |
// ......._ __________
// | 140-260 |
// Command | Service Request |
// ........|___________________|
// |stop0 |
// This can be happened?
// ......._ ______________________ ___ ............_ -----
// | | | | | | 140-260 |
// Command | | | | | Data bytes | Service Request |
// ........|___| | 140-260 |__| |_............|_________________|
// |stop0 | Tlt Stop-to-Start |start1| |stop0 |
//
// "Service requests are issued by the devices during a very specific time at the
// end of the reception of the command packet.
// If a device in need of service issues a service request, it must do so within
// the 65 µs of the Stop Bit’s low time and maintain the line low for a total of 300 µs."
//
// "A device sends a Service Request signal by holding the bus low during the low
// portion of the stop bit of any command or data transaction. The device must lengthen
// the stop by a minimum of 140 J.lS beyond its normal duration, as shown in Figure 8-15."
// http://ww1.microchip.com/downloads/en/AppNotes/00591b.pdf
if (!wait_data_hi(500)) { // Service Request(310us Adjustable Keyboard): just ignored
xprintf("R");
sei();
return -30; // something wrong
return 0;
}
if (!wait_data_lo(500)) { // Tlt/Stop to Start(140-260us)
sei();
return 0; // No data to send
return 0; // No data from device(not error);
}

// start bit(1)
if (!wait_data_hi(40)) {
xprintf("S");
sei();
return 0;
}
if (!wait_data_lo(100)) {
xprintf("s");
sei();
return 0;
}

uint8_t n = 17; // start bit + 16 data bits
uint8_t n = 0; // bit count
do {
//
// |<- bit_cell_max(130) ->|
// | |<- lo ->|
// | | |<-hi->|
// _______
// | | |
// | 130-lo | lo-hi |
// |________| |
//
uint8_t lo = (uint8_t)wait_data_hi(130);
if (!lo) goto error;
if (!lo) goto error; // no more bit or after stop bit

uint8_t hi = (uint8_t)wait_data_lo(lo);
if (!hi) goto error;
if (!hi) goto error; // stop bit extedned by Srq?

hi = lo - hi;
lo = 130 - lo;
if (n / 8 >= len) continue; // can't store in buf

data <<= 1;
if (lo < hi) {
data |= 1;
} else if (n == 17) {
sei();
return -20;
buf[n / 8] <<= 1;
if ((130 - lo) < (lo - hi)) {
buf[n / 8] |= 1;
}
} 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;
} while (++n);

error:
sei();
return -n;
return n / 8;
}

void adb_host_listen(uint8_t cmd, uint8_t data_h, uint8_t data_l) {
uint16_t adb_host_talk(uint8_t addr, uint8_t reg) {
uint8_t len;
uint8_t buf[8];
len = adb_host_talk_buf(addr, reg, buf, 8);
if (len != 2) return 0;
return (buf[0] << 8 | buf[1]);
}

void adb_host_listen_buf(uint8_t addr, uint8_t reg, uint8_t *buf, uint8_t len) {
cli();
attention();
send_byte(cmd);
place_bit0(); // Stopbit(0)
send_byte((addr << 4) | ADB_CMD_LISTEN | reg);
place_bit0(); // Stopbit(0)
// TODO: Service Request
_delay_us(200); // Tlt/Stop to Start
place_bit1(); // Startbit(1)
send_byte(data_h);
send_byte(data_l);
for (int8_t i = 0; i < len; i++) {
send_byte(buf[i]);
// xprintf("%02X ", buf[i]);
}
place_bit0(); // Stopbit(0);
sei();
}

void adb_host_listen(uint8_t addr, uint8_t reg, uint8_t data_h, uint8_t data_l) {
uint8_t buf[2] = {data_h, data_l};
adb_host_listen_buf(addr, reg, buf, 2);
}

void adb_host_flush(uint8_t addr) {
cli();
attention();
send_byte((addr << 4) | ADB_CMD_FLUSH);
place_bit0(); // Stopbit(0)
_delay_us(200); // Tlt/Stop to Start
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);
// Listen Register2
// upper byte: not used
// lower byte: bit2=ScrollLock, bit1=CapsLock, bit0=NumLock
adb_host_listen(ADB_ADDR_KEYBOARD, ADB_REG_2, 0, led & 0x07);
}

#ifdef ADB_PSW_BIT
Expand Down Expand Up @@ -327,7 +372,7 @@ Commands

bits commands
------------------------------------------------------
- - - - 0 0 0 0 Send Request(reset all devices)
- - - - 0 0 0 0 Send Reset(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
Expand Down Expand Up @@ -435,5 +480,56 @@ Keyboard LEDs & state of keys(Register2)
| +----------------------------- Delete
+------------------------------- Reserved

Address, Handler ID and bits(Register3)
1514131211 . . 8 7 . . . . . . 0
| | | | | | | | | | | | | | | |
| | | | | | | | +-+-+-+-+-+-+-+- Handler ID
| | | | +-+-+-+----------------- Address
| | | +------------------------- 0
| | +--------------------------- Service request enable(1 = enabled)
| +----------------------------- Exceptional event(alwyas 1 if not used)
+------------------------------- 0

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]

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
*/
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