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Add Initial files of 4704_usb

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example_keyboards
tmk 11 years ago
parent cb3a547ebf
commit ebe951a445
10 changed files with 792 additions and 0 deletions
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93
converter/ibm4704_usb/Makefile
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# Target file name (without extension).
TARGET = ibm4704_usb
# Directory common source filess exist
TOP_DIR = ../..
# Directory keyboard dependent files exist
TARGET_DIR = .
# project specific files
SRC = keymap_common.c \
matrix.c \
led.c \
protocol/ibm4704.c
ifdef KEYMAP
SRC := keymap_$(KEYMAP).c $(SRC)
else
SRC := keymap_plain.c $(SRC)
endif
CONFIG_H = config.h
# MCU name
#MCU = at90usb1287
MCU = atmega32u4
# Processor frequency.
# This will define a symbol, F_CPU, in all source code files equal to the
# processor frequency in Hz. You can then use this symbol in your source code to
# calculate timings. Do NOT tack on a 'UL' at the end, this will be done
# automatically to create a 32-bit value in your source code.
#
# This will be an integer division of F_USB below, as it is sourced by
# F_USB after it has run through any CPU prescalers. Note that this value
# does not *change* the processor frequency - it should merely be updated to
# reflect the processor speed set externally so that the code can use accurate
# software delays.
F_CPU = 16000000
#
# LUFA specific
#
# Target architecture (see library "Board Types" documentation).
ARCH = AVR8
# Input clock frequency.
# This will define a symbol, F_USB, in all source code files equal to the
# input clock frequency (before any prescaling is performed) in Hz. This value may
# differ from F_CPU if prescaling is used on the latter, and is required as the
# raw input clock is fed directly to the PLL sections of the AVR for high speed
# clock generation for the USB and other AVR subsections. Do NOT tack on a 'UL'
# at the end, this will be done automatically to create a 32-bit value in your
# source code.
#
# If no clock division is performed on the input clock inside the AVR (via the
# CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
F_USB = $(F_CPU)
# Interrupt driven control endpoint task(+60)
OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
# Boot Section Size in *bytes*
# Teensy halfKay 512
# Teensy++ halfKay 1024
# Atmel DFU loader 4096
# LUFA bootloader 4096
# USBaspLoader 2048
OPT_DEFS += -DBOOTLOADER_SIZE=4096
# Build Options
# comment out to disable the options.
#
#BOOTMAGIC_ENABLE = yes # Virtual DIP switch configuration(+1000)
#MOUSEKEY_ENABLE = yes # Mouse keys(+4700)
##EXTRAKEY_ENABLE = yes # Audio control and System control(+450)
CONSOLE_ENABLE = yes # Console for debug(+400)
COMMAND_ENABLE = yes # Commands for debug and configuration
#NKRO_ENABLE = yes # USB Nkey Rollover - not yet supported in LUFA
# Search Path
VPATH += $(TARGET_DIR)
VPATH += $(TOP_DIR)
include $(TOP_DIR)/protocol.mk
include $(TOP_DIR)/protocol/lufa.mk
include $(TOP_DIR)/common.mk
include $(TOP_DIR)/rules.mk

31
converter/ibm4704_usb/README.md
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IBM 4704 to USB keyboard converter
=======----=======================
This firmware converts IBM 4704 keyboard protocol to USB HID.
Connect Wires
-------------
In case of Teensy2.0(ATMega32U4):
1. Connect Vcc and GND.
2. Connect Clock and Data line.
- Clock is on PD1 and Data on PD2.
3. Optionally you need pull-up register. 1KOhm is OK?
To change pin configuration edit config.h.
Build Firmware
--------------
Just run `make`:
$ make
To select keymap:
$ make KEYMAP=[plain|...]
Keymap
------
Several version of keymap are available in advance but you are recommended to define your favorite layout yourself. To define your own keymap create file named `keymap_<name>.c` and see keymap document(you can find in top README.md) and existent keymap files.

73
converter/ibm4704_usb/config.h
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/*
Copyright 2014 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CONFIG_H
#define CONFIG_H
#include <avr/interrupt.h>
#define VENDOR_ID 0xFEED
#define PRODUCT_ID 0x4707
#define DEVICE_VER 0x0001
#define MANUFACTURER t.m.k.
#define PRODUCT IBM 4704 keyboard converter
#define DESCRIPTION convert IBM 4704 keyboard to USB
/* matrix size */
#define MATRIX_ROWS 16 // keycode bit3-6
#define MATRIX_COLS 8 // keycode bit0-2
/* key combination for command */
#define IS_COMMAND() ( \
keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) \
)
/*
* Busywait
*/
#define IBM4704_CLOCK_PORT PORTD
#define IBM4704_CLOCK_PIN PIND
#define IBM4704_CLOCK_DDR DDRD
#define IBM4704_CLOCK_BIT 1
#define IBM4704_DATA_PORT PORTD
#define IBM4704_DATA_PIN PIND
#define IBM4704_DATA_DDR DDRD
#define IBM4704_DATA_BIT 2
/*
* Pin interrupt
*/
#ifdef IBM4704_USE_INT
#define IBM4704_INT_INIT() do { \
EICRA |= ((1<<ISC11) | \
(0<<ISC10)); \
} while (0)
#define IBM4704_INT_ON() do { \
EIMSK |= (1<<INT1); \
} while (0)
#define IBM4704_INT_OFF() do { \
EIMSK &= ~(1<<INT1); \
} while (0)
#define IBM4704_INT_VECT INT1_vect
#endif
#endif

30
converter/ibm4704_usb/keymap_common.c
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/*
Copyright 2011,2012,2013 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "keymap_common.h"
/* translates key to keycode */
uint8_t keymap_key_to_keycode(uint8_t layer, key_t key)
{
return pgm_read_byte(&keymaps[(layer)][(key.row)][(key.col)]);
}
/* translates Fn keycode to action */
action_t keymap_fn_to_action(uint8_t keycode)
{
return (action_t){ .code = pgm_read_word(&fn_actions[FN_INDEX(keycode)]) };
}

73
converter/ibm4704_usb/keymap_common.h
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/*
Copyright 2011,2012,2013 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef KEYMAP_COMMON_H
#define KEYMAP_COMMON_H
#include <stdint.h>
#include <stdbool.h>
#include <avr/pgmspace.h>
#include "keycode.h"
#include "action.h"
#include "action_macro.h"
#include "report.h"
#include "print.h"
#include "debug.h"
#include "keymap.h"
// 32*8(256) byte array which converts PS/2 code into USB code
extern const uint8_t keymaps[][MATRIX_ROWS][MATRIX_COLS];
extern const uint16_t fn_actions[];
/* Original keys */
#define KEYMAP( \
K00,K18,K19,K1A,K10,K11,K12,K08,K09,K0A,K0F,K1F,K0D,K0C,K0E, \
K04,K05,K06,K13,K14,K15,K16,K17,K01,K02,K03,K1B,K1C,K1D, \
K20,K21,K22,K23,K24,K25,K26,K27,K28,K29,K2A,K2B,K2C,K2D, \
K30,K3E,K32,K33,K34,K35,K36,K37,K38,K39,K3A,K3B,K3D, \
K31,K41,K3F, K40, K42,K2F \
) { \
{ KC_##K00, KC_##K01, KC_##K02, KC_##K03, KC_##K04, KC_##K05, KC_##K06, KC_NO }, \
{ KC_##K08, KC_##K09, KC_##K0A, KC_NO, KC_##K0C, KC_##K0D, KC_##K0E, KC_##K0F }, \
{ KC_##K10, KC_##K11, KC_##K12, KC_##K13, KC_##K14, KC_##K15, KC_##K16, KC_##K17 }, \
{ KC_##K18, KC_##K19, KC_##K1A, KC_##K1B, KC_##K1C, KC_##K1D, KC_NO, KC_##K1F }, \
{ KC_##K20, KC_##K21, KC_##K22, KC_##K23, KC_##K24, KC_##K25, KC_##K26, KC_##K27 }, \
{ KC_##K28, KC_##K29, KC_##K2A, KC_##K2B, KC_##K2C, KC_##K2D, KC_NO, KC_##K2F }, \
{ KC_##K30, KC_##K31, KC_##K32, KC_##K33, KC_##K34, KC_##K35, KC_##K36, KC_##K37 }, \
{ KC_##K38, KC_##K39, KC_##K3A, KC_##K3B, KC_NO, KC_##K3D, KC_##K3E, KC_##K3F }, \
{ KC_##K40, KC_##K41, KC_##K42, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
{ KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO, KC_NO }, \
}
#endif
/*
{ K48, K49, K4A, K4B, K4C, K4D, K4E, K4F }, \
{ K50, K51, K52, K53, K54, K55, K56, K57 }, \
{ K58, K59, K5A, K5B, K5C, K5D, K5E, K5F }, \
{ K60, K61, K62, K63, K64, K65, K66, K67 }, \
{ K68, K69, K6A, K6B, K6C, K6D, K6E, K6F }, \
{ K70, K71, K72, K73, K74, K75, K76, K77 }, \
{ K78, K79, K7A, K7B, K7C, K7D, K7E, K7F }, \
*/

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converter/ibm4704_usb/keymap_plain.c
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#include "keymap_common.h"
const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
/* 0: default
* ,-----------------------------------------------------------.
* | `| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|???|BS |
* |-----------------------------------------------------------|
* |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| \|
* |-----------------------------------------------------------|
* |Ctrl | A| S| D| F| G| H| J| K| L| ;| '|???|Ret |
* |-----------------------------------------------------------|
* |Shif|???| Z| X| C| V| B| N| M| ,| ,| /|???|Shift |
* |-----------------------------------------------------------|
* |Ctrl |Gui|Alt | Space |Alt |Gui|Ctrl |
* `-----------------------------------------------------------'
*/
KEYMAP(
ESC, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, MINS,EQL, BSLS,GRV, \
TAB, Q, W, E, R, T, Y, U, I, O, P, LBRC,RBRC,BSPC, \
LCTL,A, S, D, F, G, H, J, K, L, SCLN,QUOT,NO, ENT, \
LSFT,NO, Z, X, C, V, B, N, M, COMM,DOT, SLSH, RSFT, \
LCTL,LGUI,LALT, SPC, RGUI,RCTL \
),
};
const uint16_t PROGMEM fn_actions[] = {
};

24
converter/ibm4704_usb/led.c
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/*
Copyright 2011 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdint.h"
#include "led.h"
void led_set(uint8_t usb_led)
{
}

179
converter/ibm4704_usb/matrix.c
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/*
Copyright 2014 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "action.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "ibm4704.h"
#include "matrix.h"
static void matrix_make(uint8_t code);
static void matrix_break(uint8_t code);
static void matrix_clear(void);
/*
* Matrix Array usage:
* IBM 4704 scan codes are assigned into 128(16x8)-cell matrix.
*
* 8bit wide
* +---------+
* 0| |
* :| XX | 00-7F
* f| |
* +---------+
*
* Exceptions:
*/
static uint8_t matrix[MATRIX_ROWS];
// scan code bits 7654 3210
// R:row/C:column -RRR RCCC
#define ROW(code) ((code>>3)&0x0f)
#define COL(code) (code&0x07)
inline
uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
static void enable_break(void)
{
uint8_t ret;
for (uint8_t code = 0; code < 0x80; code++) {
while (ibm4704_send(0x80|code) != 0) {
print("z");
}
_delay_ms(1);
ret = ibm4704_recv();
if (ret!=0xFF) {
xprintf("%0X: %0X ", code, ret);
}
}
_delay_us(100);
print("End\n");
while (ibm4704_send(0xFF) != 0) {
print("Z");
} // End
}
void matrix_init(void)
{
debug_enable = true;
ibm4704_init();
matrix_clear();
xprintf("------\n");
enable_break();
//while (ibm4704_send(0x8C) != 0) ;
//while (ibm4704_send(0xFF) != 0) ;
}
/*
* IBM 4704 Scan Code
*/
uint8_t matrix_scan(void)
{
uint8_t code = ibm4704_recv();
if (code==0xFF) {
// Not receivd
return 0;
} else if ((code&0x78)==0x78) {
// 0xFF-F8 and 0x7F-78 is not scan code
dprintf("Error: %0X\n", code);
matrix_clear();
return 0;
} else if (code&0x80) {
matrix_make(code);
} else {
matrix_break(code);
}
return 1;
}
inline
bool matrix_has_ghost(void)
{
return false;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & (1<<col));
}
inline
uint8_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
void matrix_print(void)
{
print("\nr/c 01234567\n");
for (uint8_t row = 0; row < matrix_rows(); row++) {
// TODO: use new function
phex(row); print(": ");
pbin_reverse(matrix_get_row(row));
print("\n");
}
}
uint8_t matrix_key_count(void)
{
uint8_t count = 0;
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
count += bitpop(matrix[i]);
}
return count;
}
inline
static void matrix_make(uint8_t code)
{
matrix[ROW(code)] |= 1<<COL(code);
}
inline
static void matrix_break(uint8_t code)
{
matrix[ROW(code)] &= ~(1<<COL(code));
}
inline
static void matrix_clear(void)
{
for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
}

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protocol/ibm4704.c
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/*
Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
*/
#include <stdbool.h>
#include <util/delay.h>
#include "debug.h"
#include "ibm4704.h"
#define WAIT(stat, us, err) do { \
if (!wait_##stat(us)) { \
ibm4704_error = err; \
goto ERROR; \
} \
} while (0)
uint8_t ibm4704_error = 0;
void ibm4704_init(void)
{
// POR
//_delay_ms(2500);
//while ( 0xA3 != ibm4704_recv() ) ;
inhibit();
DDRD |= 1<<3;
PORTD &= ~(1<<3);
}
uint8_t ibm4704_send(uint8_t data)
{
bool parity = true; // odd parity
ibm4704_error = 0;
/* Request to send */
idle();
clock_lo();
PIND |= 1<<3;
/* wait for Start bit(Clock:lo/Data:hi) */
WAIT(data_hi, 300, 0x30);
/* Data bit */
for (uint8_t i = 0; i < 8; i++) {
WAIT(clock_hi, 100, 0x31);
//_delay_us(5);
PIND |= 1<<3;
if (data&(1<<i)) {
parity = !parity;
data_hi();
} else {
data_lo();
}
WAIT(clock_lo, 100, 0x32);
}
/* Parity bit */
WAIT(clock_hi, 100, 4);
PIND |= 1<<3;
if (parity) { data_hi(); } else { data_lo(); }
WAIT(clock_lo, 100, 5);
/* Stop bit */
WAIT(clock_hi, 100, 4);
data_hi();
/* End */
WAIT(data_lo, 100, 6);
inhibit();
_delay_us(200); // wait to recover clock to hi
return 0;
ERROR:
inhibit();
xprintf("x%02X ", ibm4704_error);
_delay_us(200); // wait to recover clock to hi
return -1;
}
/* receive data when host want else inhibit communication */
uint8_t ibm4704_recv_response(void)
{
// 250 * 100us(wait start bit in ibm4704_recv)
uint8_t data = 0;
uint8_t try = 250;
do {
data = ibm4704_recv();
} while (try-- && ibm4704_error);
return data;
}
/*
Keyboard to Host:
Clock ~~~~___~~_~~_~~_~~_~~_~~_~~_~~_~~_~~~~~~~~ H:60us/L:30us
Data ____~~X==X==X==X==X==X==X==X==X==X________
| 0 1 2 3 4 5 6 7 P(odd)
| LSB MSB
Start bit(80us)
*/
uint8_t ibm4704_recv(void)
{
uint8_t data = 0;
bool parity = true; // odd parity
ibm4704_error = IBM4704_ERR_NONE;
idle();
_delay_us(5); // wait for line settles
/* start bit */
WAIT(clock_lo, 100, 1); // wait for keyboard to send
WAIT(data_hi, 100, 2); // can be delayed that long
WAIT(clock_hi, 100, 3); // first rising edge which can take longer
/* data */
for (uint8_t i = 0; i < 8; i++) {
WAIT(clock_hi, 100, 0x20+i);
//_delay_us(5);
if (data_in()) {
parity = !parity;
data |= (1<<i);
}
WAIT(clock_lo, 150, 0x28+i);
}
/* parity */
WAIT(clock_hi, 100, 7);
if (data_in() != parity) {
ibm4704_error = IBM4704_ERR_PARITY;
goto ERROR;
}
WAIT(clock_lo, 150, 8);
/* stop bit */
WAIT(clock_hi, 100, 9);
WAIT(data_lo, 1, 9);
inhibit();
_delay_us(200); // wait to recover clock to hi
return data;
ERROR:
if (ibm4704_error > 2) {
xprintf("x%02X ", ibm4704_error);
}
inhibit();
_delay_us(200); // wait to recover clock to hi
return -1;
}

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protocol/ibm4704.h
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/*
Copyright 2014 Jun WAKO <wakojun@gmail.com>
*/
#ifndef IBM4704_H
#define IBM4704_H
#define IBM4704_ERR_NONE 0
#define IBM4704_ERR_STARTBIT 1
#define IBM4704_ERR_PARITY 0x70
void ibm4704_init(void);
uint8_t ibm4704_send(uint8_t data);
uint8_t ibm4704_recv_response(void);
uint8_t ibm4704_recv(void);
/* Check pin configuration */
#if !(defined(IBM4704_CLOCK_PORT) && \
defined(IBM4704_CLOCK_PIN) && \
defined(IBM4704_CLOCK_DDR) && \
defined(IBM4704_CLOCK_BIT))
# error "ibm4704 clock pin configuration is required in config.h"
#endif
#if !(defined(IBM4704_DATA_PORT) && \
defined(IBM4704_DATA_PIN) && \
defined(IBM4704_DATA_DDR) && \
defined(IBM4704_DATA_BIT))
# error "ibm4704 data pin configuration is required in config.h"
#endif
/*--------------------------------------------------------------------
* static functions
*------------------------------------------------------------------*/
static inline void clock_lo(void)
{
IBM4704_CLOCK_PORT &= ~(1<<IBM4704_CLOCK_BIT);
IBM4704_CLOCK_DDR |= (1<<IBM4704_CLOCK_BIT);
}
static inline void clock_hi(void)
{
/* input with pull up */
IBM4704_CLOCK_DDR &= ~(1<<IBM4704_CLOCK_BIT);
IBM4704_CLOCK_PORT |= (1<<IBM4704_CLOCK_BIT);
}
static inline bool clock_in(void)
{
IBM4704_CLOCK_DDR &= ~(1<<IBM4704_CLOCK_BIT);
IBM4704_CLOCK_PORT |= (1<<IBM4704_CLOCK_BIT);
_delay_us(1);
return IBM4704_CLOCK_PIN&(1<<IBM4704_CLOCK_BIT);
}
static inline void data_lo(void)
{
IBM4704_DATA_PORT &= ~(1<<IBM4704_DATA_BIT);
IBM4704_DATA_DDR |= (1<<IBM4704_DATA_BIT);
}
static inline void data_hi(void)
{
/* input with pull up */
IBM4704_DATA_DDR &= ~(1<<IBM4704_DATA_BIT);
IBM4704_DATA_PORT |= (1<<IBM4704_DATA_BIT);
}
static inline bool data_in(void)
{
IBM4704_DATA_DDR &= ~(1<<IBM4704_DATA_BIT);
IBM4704_DATA_PORT |= (1<<IBM4704_DATA_BIT);
_delay_us(1);
return IBM4704_DATA_PIN&(1<<IBM4704_DATA_BIT);
}
static inline uint16_t wait_clock_lo(uint16_t us)
{
while (clock_in() && us) { asm(""); _delay_us(1); us--; }
return us;
}
static inline uint16_t wait_clock_hi(uint16_t us)
{
while (!clock_in() && us) { asm(""); _delay_us(1); us--; }
return us;
}
static inline uint16_t wait_data_lo(uint16_t us)
{
while (data_in() && us) { asm(""); _delay_us(1); us--; }
return us;
}
static inline uint16_t wait_data_hi(uint16_t us)
{
while (!data_in() && us) { asm(""); _delay_us(1); us--; }
return us;
}
/* idle state that device can send */
static inline void idle(void)
{
clock_hi();
data_hi();
}
/* inhibit device to send
* keyboard checks Data line on start bit(Data:hi) and it stops sending if Data line is low.
*/
static inline void inhibit(void)
{
clock_hi();
data_lo();
}
#endif
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