From 7b11a07e7981d932967358bd13e8f96454663212 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Pascal=20Eng=C3=A9libert?= Date: Wed, 5 Feb 2025 16:38:59 +0100 Subject: [PATCH] Initial commit --- LICENSE | 661 +++++++++++++++++++++++++++++++++++++++++++ README.md | 15 + ibm-ps2-keyboard.ino | 525 ++++++++++++++++++++++++++++++++++ 3 files changed, 1201 insertions(+) create mode 100644 LICENSE create mode 100644 README.md create mode 100644 ibm-ps2-keyboard.ino diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..be3f7b2 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..34b0814 --- /dev/null +++ b/README.md @@ -0,0 +1,15 @@ +# PS/2 adapter for terminal keyboard + +[Blog article that explains everything](https://txmn.tk/blog/ibm-keyboard/) + +Thanks to the authors of [ps2dev](https://github.com/Harvie/ps2dev) on which this code is based. + +## License + +[Support me via LiberaPay](https://liberapay.com/tuxmain/donate) + +GNU AGPL v3, CopyLeft 2025 Pascal Engélibert [(why copyleft?)](https://txmn.tk/blog/why-copyleft/) + +This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3 of the License. +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 Affero General Public License for more details. +You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/. diff --git a/ibm-ps2-keyboard.ino b/ibm-ps2-keyboard.ino new file mode 100644 index 0000000..1e7367f --- /dev/null +++ b/ibm-ps2-keyboard.ino @@ -0,0 +1,525 @@ +/* + * PS/2 Adapter for 3488 IBM terminal keyboard (French layout) + * https://txmn.tk/blog/ibm-keyboard/ + * + * CopyLeft 2025 Pascal Engelibert + * + * This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3 of the License. + * 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 Affero General Public License for more details. + * You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/. + * + * Contains substantial amount of code directly adapted from ps2dev (https://github.com/Harvie/ps2dev): + * ps2dev written by Chris J. Kiick, January 2008. + * ps2dev modified by Gene E. Scogin, August 2008. + * ps2dev released into public domain. + */ + +// Arduino Mega +/*#define PIN_KB_CLOCK 2 +#define PIN_KB_DATA 3 +#define PIN_PS2_CLOCK 19 +#define PIN_PS2_DATA 18*/ + +// Attiny402 +#define PIN_KB_CLOCK PIN_PA1 +#define PIN_KB_DATA PIN_PA2 +#define PIN_PS2_CLOCK PIN_PA6 +#define PIN_PS2_DATA PIN_PA7 + +// Code sent by the keyboard before a keycode, if a special key is released +#define KB_RELEASE 240 + +// Characters received from the keyboard +#define BUF_LEN 8 + +#define BYTE_INTERVAL_MICROS 100 + +//since for the device side we are going to be in charge of the clock, +//the two defines below are how long each _phase_ of the clock cycle is +#define CLKFULL 40 +// we make changes in the middle of a phase, this how long from the +// start of phase to the when we drive the data line +#define CLKHALF 20 + +// Delay between bytes +// I've found i need at least 400us to get this working at all, +// but even more is needed for reliability, so i've put 1000us +#define BYTEWAIT 1000 + +// Timeout if computer not sending for 30ms +#define TIMEOUT 30 + +unsigned char KEYMAP[133] = { +//PS2, // KB => marking new marking usage + 0 , // 0 => + 0x2f, // 1 => Config Config MENU + 0 , // 2 => + 0 , // 3 => Impr Impr + 0 , // 4 => ??? + 0x76, // 5 => Syst Effac ESCAPE + 0 , // 6 => ??? + 0x05, // 7 => F1 F1 F1 + 0 , // 8 => F13 F13 + 0x1f, // 9 => Memoir Syst SUPER + 0 , // 10 => Exec Exec + 0 , // 11 => Aide Aide + 0 , // 12 => Effac Memoir + 0x0d, // 13 => TAB TAB TAB + 0x0e, // 14 => exponent 2 exponent 2 exponent 2 + 0x06, // 15 => F2 F2 F2 + 0 , // 16 => F14 F14 + 0x14, // 17 => Rest Rest LEFT CTRL + 0x12, // 18 => Maj Maj LEFT SHIFT + 0 , // 19 => < < + 0x58, // 20 => Verr Maj Verr Maj CAPS LOCK + 0x15, // 21 => A A A + 0x16, // 22 => A1 A1 A1 + 0x04, // 23 => F3 F3 F3 + 0 , // 24 => F15 F15 + 0x11, // 25 => Alt Alt LEFT ALT + 0x1a, // 26 => W W W + 0x1b, // 27 => S S S + 0x1c, // 28 => Q Q Q + 0x1a, // 29 => Z Z Z + 0x1e, // 30 => A2 A2 A2 + 0x0c, // 31 => F4 F4 F4 + 0 , // 32 => F16 F16 + 0x21, // 33 => C C C + 0x22, // 34 => X X X + 0x23, // 35 => D D D + 0x24, // 36 => E E E + 0x25, // 37 => A4 A4 A4 + 0x26, // 38 => A3 A3 A3 + 0x03, // 39 => F5 F5 F5 + 0 , // 40 => F17 F17 + 0x29, // 41 => Espace Espace SPACE + 0x2a, // 42 => V V V + 0x2b, // 43 => F F F + 0x2c, // 44 => T T T + 0x2d, // 45 => R R R + 0x2e, // 46 => A5 A5 A5 + 0x0b, // 47 => F6 F6 F6 + 0 , // 48 => F18 F18 + 0x31, // 49 => N N N + 0x32, // 50 => B B B + 0x33, // 51 => H H H + 0x34, // 52 => G G G + 0x35, // 53 => Y Y Y + 0x36, // 54 => A6 A6 A6 + 0x83, // 55 => F7 F7 F7 + 0 , // 56 => F19 F19 + 0x11, // 57 => Alt Alt RIGHT ALT + 0x3a, // 58 => , , , + 0x3b, // 59 => J J J + 0x3c, // 60 => U U U + 0x3d, // 61 => A7 A7 A7 + 0x3e, // 62 => A8 A8 A8 + 0x0a, // 63 => F8 F8 F8 + 0 , // 64 => F20 F20 + 0x41, // 65 => ; ; ; + 0x42, // 66 => K K K + 0x43, // 67 => I I I + 0x44, // 68 => O O O + 0x45, // 69 => A0 A0 A0 + 0x46, // 70 => A9 A9 A9 + 0x01, // 71 => F9 F9 F9 + 0 , // 72 => F21 F21 + 0x49, // 73 => : : : + 0x4a, // 74 => = = = + 0x4b, // 75 => L L L + 0x4c, // 76 => M M M + 0x4d, // 77 => P P P + 0x4e, // 78 => ° ° ° + 0x09, // 79 => F10 F10 F10 + 0 , // 80 => F22 F22 + 0 , // 81 => + 0x52, // 82 => U GRAVE U GRAVE U GRAVE + 0x5d, // 83 => MU MU MU + 0x54, // 84 => ^ ^ ^ + 0x55, // 85 => - - = + 0x78, // 86 => F11 F11 F11 + 0 , // 87 => F23 F23 + 0x14, // 88 => Entree Entree RIGHT CTRL + 0x59, // 89 => Maj Maj RIGHT SHIFT + 0x5a, // 90 => ZSuiv ZSuiv ENTER + 0x5b, // 91 => $ $ $ + 0 , // 92 => + 0 , // 93 => + 0x07, // 94 => F12 F12 F12 + 0 , // 95 => F24 F24 + 0x72, // 96 => Bas Bas DOWN + 0x6b, // 97 => Gauche Gauche LEFT + 0 , // 98 => Trait Trait + 0x75, // 99 => Haut Haut UP + 0x71, // 100 => CRLF Suppr DELETE + 0x69, // 101 => Inser Saut END + 0x66, // 102 => RET ARR RET ARR BACKSPACE + 0x70, // 103 => CR Inser INSERT + 0 , // 104 => + 0x69, // 105 => KP1 KP1 KP1 + 0x74, // 106 => Droite Droite RIGHT + 0x6b, // 107 => KP4 KP4 KP4 + 0x6c, // 108 => KP7 KP7 KP7 + 0x7a, // 109 => Suppr (VIDE) PAGE DOWN + 0x6c, // 110 => Dup CR HOME + 0x7d, // 111 => Saut (VIDE) PAGE UP + 0x70, // 112 => KP0 KP0 KP0 + 0x71, // 113 => KP. KP. KP. + 0x72, // 114 => KP2 KP2 KP2 + 0x73, // 115 => KP5 KP5 KP5 + 0x74, // 116 => KP6 KP6 KP6 + 0x75, // 117 => KP8 KP8 KP8 + 0x77, // 118 => (VIDE) (VIDE) NUM LOCK + 0x4a, // 119 => (VIDE) (VIDE) KP/ + 0 , // 120 => + 0x5a, // 121 => Z POS Z POS KPENTER + 0x7a, // 122 => KP3 KP3 KP3 + 0 , // 123 => (VIDE) Z neg + 0x79, // 124 => Z neg (VIDE) KP+ + 0x7d, // 125 => KP9 KP9 KP9 + 0x7c, // 126 => (VIDE) (VIDE) KP* + 0 , // 127 => + 0 , // 128 => + 0 , // 129 => + 0 , // 130 => + 0 , // 131 => (VIDE) CRLF + 0x7b, // 132 => (VIDE) (VIDE) KP- +}; + +enum ErrorCodes +{ + EABORT = -3, + ECANCEL = -2, + ETIMEOUT = -1, + ENOERR = 0 +}; + +volatile unsigned int rec = 0; +volatile unsigned char offset = 0; +volatile unsigned char buf[BUF_LEN]; +volatile unsigned char n; +unsigned char kb_release = 0; +bool handling_io_abort = false; + +// Lighter than standard library's delay +void delay_millis(unsigned int ms) { + unsigned long end_time = millis() + ms; + while(millis() < end_time) { + delayMicroseconds(10); + } +} + +/* + * according to some code I saw, these functions will + * correctly set the clock and data pins for + * various conditions. It's done this way so you don't need + * pullup resistors. + */ +void gohi(unsigned char pin) { + pinMode(pin, INPUT); + digitalWrite(pin, HIGH); +} + +void golo(unsigned char pin) { + digitalWrite(pin, LOW); + pinMode(pin, OUTPUT); +} + +char do_write(unsigned char data) { + char ret; + if((ret = write(data)) == EABORT && !handling_io_abort) { + handling_io_abort = true; + keyboard_handle(); + handling_io_abort = false; + } + return ret; +} + +char write(unsigned char data) { + unsigned char parity = 1; + + golo(PIN_PS2_DATA); + delayMicroseconds(CLKHALF); + // device sends on falling clock + golo(PIN_PS2_CLOCK); // start bit + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF); + + for(unsigned char i=0; i < 8; i++) { + if(digitalRead(PIN_PS2_CLOCK) == LOW) { /* I/O request from host */ + gohi(PIN_PS2_DATA); + return EABORT; + } + if(data & 0x01) { + gohi(PIN_PS2_DATA); + } else { + golo(PIN_PS2_DATA); + } + delayMicroseconds(CLKHALF); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF); + + parity ^= data & 0x01; + data >>= 1; + } + // parity bit + if(parity) { + gohi(PIN_PS2_DATA); + } else { + golo(PIN_PS2_DATA); + } + delayMicroseconds(CLKHALF); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF); + if(digitalRead(PIN_PS2_CLOCK) == LOW) { /* I/O request from host */ + gohi(PIN_PS2_DATA); + return EABORT; + } + + // stop bit + gohi(PIN_PS2_DATA); + delayMicroseconds(CLKHALF); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF+BYTEWAIT); + + return ENOERR; +} + +unsigned char available() { + //delayMicroseconds(BYTEWAIT); + return (digitalRead(PIN_PS2_DATA) == LOW) || (digitalRead(PIN_PS2_CLOCK) == LOW); +} + +char do_read(unsigned char * value) { + char ret; + if((ret = read(value)) == EABORT && !handling_io_abort) { + handling_io_abort = true; + keyboard_handle(); + handling_io_abort = false; + } + return ret; +} + +char read(unsigned char * value) { + // wait for data line to go low and clock line to go high (or timeout) + unsigned long waiting_since = millis(); + while((digitalRead(PIN_PS2_DATA) != LOW) || (digitalRead(PIN_PS2_CLOCK) != HIGH)) { + if(!available()) return ECANCEL; /* Cancelled */ + if(millis() - waiting_since > TIMEOUT) return ETIMEOUT; + } + + delayMicroseconds(CLKHALF); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF); + + if(digitalRead(PIN_PS2_CLOCK) == LOW) { /* I/O request from host */ + return EABORT; + } + + unsigned char calculated_parity = 1; + for(unsigned char i = 0; i < 8; i ++) { + unsigned char recbit = digitalRead(PIN_PS2_DATA); + *value |= recbit << i; + calculated_parity ^= recbit; + + delayMicroseconds(CLKHALF); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF); + + if (digitalRead(PIN_PS2_CLOCK) == LOW) { /* I/O request from host */ + return EABORT; + } + } + // we do the delay at the end of the loop, so at this point we have + // already done the delay for the parity bit + + // parity bit + calculated_parity ^= digitalRead(PIN_PS2_DATA); + + // stop bit + delayMicroseconds(CLKHALF); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + golo(PIN_PS2_DATA); + golo(PIN_PS2_CLOCK); + delayMicroseconds(CLKFULL); + gohi(PIN_PS2_CLOCK); + delayMicroseconds(CLKHALF); + gohi(PIN_PS2_DATA); + + return calculated_parity * ECANCEL; +} + +void ack() { + delayMicroseconds(BYTE_INTERVAL_MICROS); + write(0xFA); + delayMicroseconds(BYTE_INTERVAL_MICROS); +} + +void write_fa() { + while(write(0xFA) != 0) delayMicroseconds(1000); +} + +void keyboard_handle() { + if(available()) { + unsigned char cmd; + if(!read(&cmd)) { + switch(cmd) { + case 0xFF: // reset + ack(); + // the while loop lets us wait for the host to be ready + write_fa(); // send ACK + while(write(0xAA) != 0) delayMicroseconds(1000); // send BAT_SUCCESS + break; + case 0xFE: // resend + case 0xF6: // set defaults + case 0xF5: // disable data reporting + case 0xF4: // enable data reporting + // FM + ack(); + break; + case 0xF3: //set typematic rate + ack(); + if(!read(&cmd)) ack(); //do nothing with the rate + break; + case 0xF2: //get device id + ack(); + do { + // ensure ID gets written, some hosts may be sensitive + if(do_write(0xAB) == EABORT) continue; + // this is critical for combined ports (they decide mouse/kb on this) + if(do_write(0x83) == EABORT) continue; + break; + } while(!handling_io_abort); + break; + case 0xF0: // set scan code set + ack(); + if(!read(&cmd)) ack(); //do nothing with the rate + break; + case 0xEE: // echo + //ack(); + delayMicroseconds(BYTE_INTERVAL_MICROS); + write(0xEE); + delayMicroseconds(BYTE_INTERVAL_MICROS); + break; + case 0xED: //set/reset LEDs + //ack(); + write_fa(); + if(!read(&cmd)) { + write_fa(); + } + } + } + } +} + +// signal from keyboard +void isr_kb() { + unsigned char d = digitalRead(PIN_KB_DATA); + if(offset == 0 && d != 0) + return; + rec |= ((unsigned int) d) << offset; + offset ++; + if(offset >= 11) { + offset = 0; + if(rec != 0) { + buf[n] = rec >> 1; + rec = 0; + } + n = (n + 1) % BUF_LEN; + } +} + +void setup() +{ + pinMode(PIN_KB_CLOCK, INPUT); + pinMode(PIN_KB_DATA, INPUT); + gohi(PIN_PS2_CLOCK); + gohi(PIN_PS2_DATA); + delay_millis(200); + write(0xAA); + attachInterrupt(digitalPinToInterrupt(PIN_KB_CLOCK), isr_kb, FALLING); +} + +void loop() +{ + //Handle PS2 communication and react to keyboard led change + //This should be done at least once each 10ms + keyboard_handle(); + + if(n > 0) { + noInterrupts(); + for(unsigned char i = 0; i < n; i ++) { + unsigned char c = buf[i]; + if(c == KB_RELEASE) { + kb_release = 1; + } else { + unsigned char released = 0; + unsigned char press_and_release = 0; + switch(c) { + case 17: + case 18: + case 20: + case 25: + case 57: + case 88: + case 89: + if(kb_release) { + kb_release = 0; + released = 1; + } + break; + default: + if(c > 132) + c = 0; + press_and_release = 1; + } + unsigned char cc = KEYMAP[c]; + if(cc != 0) { + send: + do { + switch(c) { + case 9: // SUPER + case 57: // RIGHT ALT + case 88: // RIGHT CTRL + case 96: // UP + case 97: // DOWN + case 99: // LEFT + case 100: // DELETE + case 103: // INSERT + case 106: // RIGHT + case 119: // KP/ + case 121: // Z POS (KP ENTER) + // It's a special character + if(do_write(0xe0) == EABORT) continue; + } + if(released && do_write(0xf0) == EABORT) continue; + if(do_write(cc) == EABORT) continue; + break; + } while(!handling_io_abort); + if(press_and_release) { + press_and_release = 0; + released = 1; + goto send; + } + } + } + } + n = 0; + interrupts(); + } + delayMicroseconds(1000); +}