Add Initial files of 4704_usb
10 files changed, 792 insertions(+), 0 deletions(-) A converter/ibm4704_usb/Makefile A converter/ibm4704_usb/README.md A converter/ibm4704_usb/config.h A converter/ibm4704_usb/keymap_common.c A converter/ibm4704_usb/keymap_common.h A converter/ibm4704_usb/keymap_plain.c A converter/ibm4704_usb/led.c A converter/ibm4704_usb/matrix.c A protocol/ibm4704.c A protocol/ibm4704.h
A converter/ibm4704_usb/Makefile => converter/ibm4704_usb/Makefile +93 -0
@@ 0,0 1,93 @@ # 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
A converter/ibm4704_usb/README.md => converter/ibm4704_usb/README.md +31 -0
@@ 0,0 1,31 @@ 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.
A converter/ibm4704_usb/config.h => converter/ibm4704_usb/config.h +73 -0
@@ 0,0 1,73 @@ /* 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
A converter/ibm4704_usb/keymap_common.c => converter/ibm4704_usb/keymap_common.c +30 -0
@@ 0,0 1,30 @@ /* 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)]) }; }
A converter/ibm4704_usb/keymap_common.h => converter/ibm4704_usb/keymap_common.h +73 -0
@@ 0,0 1,73 @@ /* 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 }, \ */
A converter/ibm4704_usb/keymap_plain.c => converter/ibm4704_usb/keymap_plain.c +28 -0
@@ 0,0 1,28 @@ #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[] = { };
A converter/ibm4704_usb/led.c => converter/ibm4704_usb/led.c +24 -0
@@ 0,0 1,24 @@ /* 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) { }
A converter/ibm4704_usb/matrix.c => converter/ibm4704_usb/matrix.c +179 -0
@@ 0,0 1,179 @@ /* 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; }
A protocol/ibm4704.c => protocol/ibm4704.c +150 -0
@@ 0,0 1,150 @@ /* 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; }
A protocol/ibm4704.h => protocol/ibm4704.h +111 -0
@@ 0,0 1,111 @@ /* 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