From 6d7745a110daad815fe5edbb35a2e33702f24aaa Mon Sep 17 00:00:00 2001 From: markspanbroek Date: Mon, 22 Oct 2018 21:37:03 +0200 Subject: [PATCH] Keyboard: Port of TMK XT USB Converter (#3619) * Converter: add XT USB converter from TMK * Converter: port TMK code for USB converter to QMK * Apply requested changes after code review by @drashna - use "pragma once" instead of include guards - use LAYOUT instead of KEYMAP - allow customisation with matrix_init_user() and matrix_scan_user() - set BOOTLOADER instead of BOOTLOADER_SIZE - Add XT_ENABLE to OPT_DEFS * Remove unnecessary lines --- keyboards/converter/xt_usb/README.md | 17 + keyboards/converter/xt_usb/config.h | 78 +++++ .../converter/xt_usb/keymaps/default/config.h | 1 + .../converter/xt_usb/keymaps/default/keymap.c | 55 ++++ keyboards/converter/xt_usb/led.c | 22 ++ keyboards/converter/xt_usb/matrix.c | 309 ++++++++++++++++++ keyboards/converter/xt_usb/rules.mk | 62 ++++ keyboards/converter/xt_usb/xt_usb.c | 1 + keyboards/converter/xt_usb/xt_usb.h | 132 ++++++++ tmk_core/protocol.mk | 5 + tmk_core/protocol/xt.h | 71 ++++ tmk_core/protocol/xt_interrupt.c | 173 ++++++++++ 12 files changed, 926 insertions(+) create mode 100644 keyboards/converter/xt_usb/README.md create mode 100644 keyboards/converter/xt_usb/config.h create mode 100644 keyboards/converter/xt_usb/keymaps/default/config.h create mode 100644 keyboards/converter/xt_usb/keymaps/default/keymap.c create mode 100644 keyboards/converter/xt_usb/led.c create mode 100644 keyboards/converter/xt_usb/matrix.c create mode 100644 keyboards/converter/xt_usb/rules.mk create mode 100644 keyboards/converter/xt_usb/xt_usb.c create mode 100644 keyboards/converter/xt_usb/xt_usb.h create mode 100644 tmk_core/protocol/xt.h create mode 100644 tmk_core/protocol/xt_interrupt.c diff --git a/keyboards/converter/xt_usb/README.md b/keyboards/converter/xt_usb/README.md new file mode 100644 index 0000000000..40b265a189 --- /dev/null +++ b/keyboards/converter/xt_usb/README.md @@ -0,0 +1,17 @@ +XT to USB keyboard converter +============================== +This is a port of TMK's converter/xt_usb to QMK. + +This firmware converts XT keyboard protocol to USB.(It supports Scan Code Set 1.) + + +Connect Wires +------------- +1. Connect **Vcc** and **GND**. +2. Connect **Clock** and **Data** line. **Clock** is on `PD1`, **Data** on `PD0` by default. And optionally you can use `PB7` for **Reset**.(Compatible to Soarer's converter) To change pin configuration edit `config.h`. +3. You need pull-up resistor. **1K-10K Ohm** will be OK. + + +XT keyboard protocol resource +------------------------------ +https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol diff --git a/keyboards/converter/xt_usb/config.h b/keyboards/converter/xt_usb/config.h new file mode 100644 index 0000000000..963a3c6396 --- /dev/null +++ b/keyboards/converter/xt_usb/config.h @@ -0,0 +1,78 @@ +/* +Copyright 2012 Jun Wako + +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 . +*/ + +#pragma once + +#define VENDOR_ID 0xFEED +#define PRODUCT_ID 0x6512 +#define DEVICE_VER 0x0001 +#define MANUFACTURER QMK +#define PRODUCT XT keyboard converter +#define DESCRIPTION convert XT keyboard to USB + + +/* matrix size */ +#define MATRIX_ROWS 16 // keycode bit: 3-0 +#define MATRIX_COLS 8 // keycode bit: 6-4 + +/* key combination for command */ +#define IS_COMMAND() ( \ + keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT)) || \ + keyboard_report->mods == (MOD_BIT(KC_LCTRL) | MOD_BIT(KC_RSHIFT)) \ +) + + +//#define NO_SUSPEND_POWER_DOWN + +/* + * XT Pin interrupt + */ +#define XT_CLOCK_PORT PORTD +#define XT_CLOCK_PIN PIND +#define XT_CLOCK_DDR DDRD +#define XT_CLOCK_BIT 1 +#define XT_DATA_PORT PORTD +#define XT_DATA_PIN PIND +#define XT_DATA_DDR DDRD +#define XT_DATA_BIT 0 +#define XT_RST_PORT PORTB +#define XT_RST_PIN PINB +#define XT_RST_DDR DDRB +#define XT_RST_BIT 7 + +/* hard reset: low pulse for 500ms and after that HiZ for safety */ +#define XT_RESET() do { \ + XT_RST_PORT &= ~(1< + +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 . +*/ + +#include "led.h" + +void led_set(uint8_t usb_led) { + //XT Keyboards do not have LEDs, nothing to do. +} diff --git a/keyboards/converter/xt_usb/matrix.c b/keyboards/converter/xt_usb/matrix.c new file mode 100644 index 0000000000..e2d7117b13 --- /dev/null +++ b/keyboards/converter/xt_usb/matrix.c @@ -0,0 +1,309 @@ +/* +Copyright 2011 Jun Wako +Copyright 2016 Ethan Apodaca + +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 . +*/ + +#include +#include +#include "action.h" +#include "print.h" +#include "util.h" +#include "debug.h" +#include "xt.h" +#include "matrix.h" + + +static void matrix_make(uint8_t code); +static void matrix_break(uint8_t code); + +static uint8_t matrix[MATRIX_ROWS]; +#define ROW(code) (code>>3) +#define COL(code) (code&0x07) + +__attribute__ ((weak)) +void matrix_init_kb(void) { + matrix_init_user(); +} + +__attribute__ ((weak)) +void matrix_scan_kb(void) { + matrix_scan_user(); +} + +__attribute__ ((weak)) +void matrix_init_user(void) { +} + +__attribute__ ((weak)) +void matrix_scan_user(void) { +} + +void matrix_init(void) +{ + debug_enable = true; + xt_host_init(); + + // initialize matrix state: all keys off + for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00; + + matrix_init_quantum(); +} + +// convert E0-escaped codes into unused area +static uint8_t move_e0code(uint8_t code) { + switch(code) { + // Original IBM XT keyboard has these keys + case 0x37: return 0x54; // Print Screen + case 0x46: return 0x55; // Ctrl + Pause + case 0x1C: return 0x6F; // Keypad Enter + case 0x35: return 0x7F; // Keypad / + + // Any XT keyobard with these keys? + // http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/translate.pdf + // https://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc + case 0x5B: return 0x5A; // Left GUI + case 0x5C: return 0x5B; // Right GUI + case 0x5D: return 0x5C; // Application + case 0x5E: return 0x5D; // Power(not used) + case 0x5F: return 0x5E; // Sleep(not used) + case 0x63: return 0x5F; // Wake (not used) + case 0x48: return 0x60; // Up + case 0x4B: return 0x61; // Left + case 0x50: return 0x62; // Down + case 0x4D: return 0x63; // Right + case 0x52: return 0x71; // Insert + case 0x53: return 0x72; // Delete + case 0x47: return 0x74; // Home + case 0x4F: return 0x75; // End + case 0x49: return 0x77; // Home + case 0x51: return 0x78; // End + case 0x1D: return 0x7A; // Right Ctrl + case 0x38: return 0x7C; // Right Alt + } + return 0x00; +} + +uint8_t matrix_scan(void) +{ + static enum { + INIT, + E0, + // Pause: E1 1D 45, E1 9D C5 + E1, + E1_1D, + E1_9D, + } state = INIT; + + uint8_t code = xt_host_recv(); + if (!code) return 0; + xprintf("%02X ", code); + switch (state) { + case INIT: + switch (code) { + case 0xE0: + state = E0; + break; + case 0xE1: + state = E1; + break; + default: + if (code < 0x80) + matrix_make(code); + else + matrix_break(code & 0x7F); + break; + } + break; + case E0: + switch (code) { + case 0x2A: + case 0xAA: + case 0x36: + case 0xB6: + //ignore fake shift + state = INIT; + break; + default: + if (code < 0x80) + matrix_make(move_e0code(code)); + else + matrix_break(move_e0code(code & 0x7F)); + state = INIT; + break; + } + break; + case E1: + switch (code) { + case 0x1D: + state = E1_1D; + break; + case 0x9D: + state = E1_9D; + break; + default: + state = INIT; + break; + } + break; + case E1_1D: + switch (code) { + case 0x45: + matrix_make(0x55); + break; + default: + state = INIT; + break; + } + break; + case E1_9D: + switch (code) { + case 0x45: + matrix_break(0x55); + break; + default: + state = INIT; + break; + } + break; + default: + state = INIT; + } + matrix_scan_quantum(); + return 1; +} + +inline +uint8_t matrix_get_row(uint8_t row) +{ + return matrix[row]; +} + +inline +static void matrix_make(uint8_t code) +{ + if (!matrix_is_on(ROW(code), COL(code))) { + matrix[ROW(code)] |= 1< + +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 . +*/ +#pragma once + +#include "quantum.h" + +/* IBM XT keyboard layout + * ,-------. ,--------------------------------------------------------------------------. + * | F1| F2| |Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =| BS |NumLck |ScrLck | + * |-------| |--------------------------------------------------------------------------| + * | F3| F4| | Tab | Q| W| E| R| T| Y| U| I| O| P| [| ] | | 7| 8| 9| -| + * |-------| |------------------------------------------------------|Ent|---------------| + * | F5| F6| | Ctrl | A| S| D| F| G| H| J| K| L| ;| '| `| | 4| 5| 6| | + * |-------| |----------------------------------------------------------------------| | + * | F7| F8| |Shif| \| Z| X| C| V| B| N| M| ,| .| /|Shift|PrS| 1| 2| 3| +| + * |-------| |----------------------------------------------------------------------| | + * | F9|F10| | Alt | Space |CapsLck| 0 | . | | + * `-------' `--------------------------------------------------------------------------' + * Scan code set 1 + * ,-------. ,--------------------------------------------------------------------------. + * | 3B| 3C| | 01| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 0E | 45 | 46 | + * |-------| |--------------------------------------------------------------------------| + * | 3D| 3E| | 0F | 10| 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B | | 47| 48| 49| 4A| + * |-------| |------------------------------------------------------| 1C|---------------| + * | 3F| 40| | 1D | 1E| 1F| 20| 21| 22| 23| 24| 25| 26| 27| 28| 29| | 4B| 4C| 4D| | + * |-------| |----------------------------------------------------------------------| | + * | 41| 42| | 2A | 2B| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 34| 35| 36 |*37| 4F| 50| 51| 4E| + * |-------| |----------------------------------------------------------------------| | + * | 43| 44| | 38 | 39 | 3A | 52 | 53 | | + * `-------' `--------------------------------------------------------------------------' + */ +#define LAYOUT_xt( \ + K3B,K3C, K01,K02,K03,K04,K05,K06,K07,K08,K09,K0A,K0B,K0C,K0D,K0E, K45, K46, \ + K3D,K3E, K0F,K10,K11,K12,K13,K14,K15,K16,K17,K18,K19,K1A,K1B, K47,K48,K49,K4A, \ + K3F,K40, K1D,K1E,K1F,K20,K21,K22,K23,K24,K25,K26,K27,K28,K29,K1C,K4B,K4C,K4D, \ + K41,K42, K2A,K2B,K2C,K2D,K2E,K2F,K30,K31,K32,K33,K34,K35,K36,K54,K4F,K50,K51,K4E, \ + K43,K44, K38, K39, K3A, K52, K53 \ +) { \ + { KC_NO, K01, K02, K03, K04, K05, K06, K07 }, \ + { K08, K09, K0A, K0B, K0C, K0D, K0E, K0F }, \ + { K10, K11, K12, K13, K14, K15, K16, K17 }, \ + { K18, K19, K1A, K1B, K1C, K1D, K1E, K1F }, \ + { K20, K21, K22, K23, K24, K25, K26, K27 }, \ + { K28, K29, K2A, K2B, K2C, K2D, K2E, K2F }, \ + { K30, K31, K32, K33, K34, K35, K36, KC_NO }, \ + { K38, K39, K3A, K3B, K3C, K3D, K3E, K3F }, \ + { K40, K41, K42, K43, K44, K45, K46, K47 }, \ + { K48, K49, K4A, K4B, K4C, K4D, K4E, K4F }, \ + { K50, K51, K52, K53, K54, 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 } \ +} + +/* Extended keyboard layout + * ,-----------------------------------------------. + * |F13|F14|F15|F16|F17|F18|F19|F20|F21|F22|F23|F24| + * ,---. |-----------------------------------------------| ,-----------. ,-----------. + * |Esc| |F1 |F2 |F3 |F4 |F5 |F6 |F7 |F8 |F9 |F10|F11|F12| |PrS|ScL|Pau| |VDn|VUp|Mut| + * `---' `-----------------------------------------------' `-----------' `-----------' + * ,-----------------------------------------------------------. ,-----------. ,---------------. + * | `| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|JPY|Bsp| |Ins|Hom|PgU| |NmL| /| *| -| + * |-----------------------------------------------------------| |-----------| |---------------| + * |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| \ | |Del|End|PgD| | 7| 8| 9| +| + * |-----------------------------------------------------------| `-----------' |---------------| + * |CapsL | A| S| D| F| G| H| J| K| L| ;| '| #|Entr| | 4| 5| 6|KP,| + * |-----------------------------------------------------------| ,---. |---------------| + * |Shft| <| Z| X| C| V| B| N| M| ,| .| /| RO|Shift | |Up | | 1| 2| 3|Ent| + * |-----------------------------------------------------------| ,-----------. |---------------| + * |Ctl|Gui|Alt|MHEN| Space |HENK|KANA|Alt|Gui|App|Ctl| |Lef|Dow|Rig| | 0| .|KP=| + * `-----------------------------------------------------------' `-----------' `---------------' + * ,-----------------------------------------------. + * | 64| 65| 66| 67| 68| 69| 6A| 6B| 6C| 6D| 6E| 76| + * ,---. |-----------------------------------------------| ,-----------. ,-----------. + * | 01| | 3B| 3C| 3D| 3E| 3F| 40| 41| 42| 43| 44| 57| 58| |*37| 46|*45| |e5E|e5F|e63| + * `---' `-----------------------------------------------' `-----------' `-----------' + * ,-----------------------------------------------------------. ,-----------. ,---------------. + * | 29| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 7D| 0E| |e52|e47|e49| | 45|e35| 37| 4A| + * |-----------------------------------------------------------| |-----------| |---------------| + * | 0F | 10| 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B| 2B | |e53|e4F|e51| | 47| 48| 49| 4E| + * |-----------------------------------------------------------| `-----------' |---------------| + * | 3A | 1E| 1F| 20| 21| 22| 23| 24| 25| 26| 27| 28| 00| 1C | | 4B| 4C| 4D| 7E| + * |-----------------------------------------------------------| ,---. |---------------| + * | 2A | 56| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 34| 35| 73| 36 | |e48| | 4F| 50| 51|e1C| + * |-----------------------------------------------------------| ,-----------. |---------------| + * | 1D|e5B| 38| 7B | 39 | 79 | 70 |e38|e5C|e5D|e1D| |e4B|e50|e4D| | 52| 53| 59| + * `-----------------------------------------------------------' `-----------' `---------------' + * e: E0-escaped codes + * *: special handling codes + */ +#define LAYOUT( \ + K64,K65,K66,K67,K68,K69,K6A,K6B,K6C,K6D,K6E,K76, \ + K01, K3B,K3C,K3D,K3E,K3F,K40,K41,K42,K43,K44,K57,K58, K54,K46,K55, K5D,K5E,K5F, \ + K29,K02,K03,K04,K05,K06,K07,K08,K09,K0A,K0B,K0C,K0D,K7D,K0E, K71,K74,K77, K45,K7F,K37,K4A, \ + K0F,K10,K11,K12,K13,K14,K15,K16,K17,K18,K19,K1A,K1B, K2B, K72,K75,K78, K47,K48,K49,K4E, \ + K3A,K1E,K1F,K20,K21,K22,K23,K24,K25,K26,K27,K28, K00,K1C, K4B,K4C,K4D,K7E, \ + K2A,K56,K2C,K2D,K2E,K2F,K30,K31,K32,K33,K34,K35, K73,K36, K60, K4F,K50,K51,K6F, \ + K1D,K5A,K38,K7B, K39, K79,K70,K7C,K5B,K5C,K7A, K61,K62,K63, K52,K53,K59 \ +) { \ + { K00, K01, K02, K03, K04, K05, K06, K07 }, \ + { K08, K09, K0A, K0B, K0C, K0D, K0E, K0F }, \ + { K10, K11, K12, K13, K14, K15, K16, K17 }, \ + { K18, K19, K1A, K1B, K1C, K1D, K1E, K1F }, \ + { K20, K21, K22, K23, K24, K25, K26, K27 }, \ + { K28, K29, K2A, K2B, K2C, K2D, K2E, K2F }, \ + { K30, K31, K32, K33, K34, K35, K36, K37 }, \ + { K38, K39, K3A, K3B, K3C, K3D, K3E, K3F }, \ + { K40, K41, K42, K43, K44, K45, K46, K47 }, \ + { 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 } \ +} diff --git a/tmk_core/protocol.mk b/tmk_core/protocol.mk index 54913329e6..78b9deb297 100644 --- a/tmk_core/protocol.mk +++ b/tmk_core/protocol.mk @@ -50,5 +50,10 @@ ifdef ADB_MOUSE_ENABLE OPT_DEFS += -DADB_MOUSE_ENABLE -DMOUSE_ENABLE endif +ifdef XT_ENABLE + SRC += $(PROTOCOL_DIR)/xt_interrupt.c + OPT_DEFS += -DXT_ENABLE +endif + # Search Path VPATH += $(TMK_DIR)/protocol diff --git a/tmk_core/protocol/xt.h b/tmk_core/protocol/xt.h new file mode 100644 index 0000000000..93bc5daf82 --- /dev/null +++ b/tmk_core/protocol/xt.h @@ -0,0 +1,71 @@ +/* +Copyright 2018 Jun WAKO +Copyright 2016 Ethan Apodaca + +This software is licensed with a Modified BSD License. +All of this is supposed to be Free Software, Open Source, DFSG-free, +GPL-compatible, and OK to use in both free and proprietary applications. +Additions and corrections to this file are welcome. + + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + +* Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + +* Neither the name of the copyright holders nor the names of + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +POSSIBILITY OF SUCH DAMAGE. +*/ + +#ifndef XT_H +#define XT_H + +#define XT_DATA_IN() do { \ + XT_DATA_DDR &= ~(1< +Copyright 2016 Ethan Apodaca + +This software is licensed with a Modified BSD License. +All of this is supposed to be Free Software, Open Source, DFSG-free, +GPL-compatible, and OK to use in both free and proprietary applications. +Additions and corrections to this file are welcome. + + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + +* Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + +* Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + +* Neither the name of the copyright holders nor the names of + contributors may be used to endorse or promote products derived + from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +POSSIBILITY OF SUCH DAMAGE. +*/ + +#include +#include +#include +#include "xt.h" +#include "wait.h" +#include "print.h" + +static inline uint8_t pbuf_dequeue(void); +static inline void pbuf_enqueue(uint8_t data); +static inline bool pbuf_has_data(void); +static inline void pbuf_clear(void); + +void xt_host_init(void) +{ + XT_INT_INIT(); + XT_INT_OFF(); + + /* hard reset */ +#ifdef XT_RESET + XT_RESET(); +#endif + + /* soft reset: pull clock line down for 20ms */ + XT_DATA_LO(); + XT_CLOCK_LO(); + _delay_ms(20); + + /* input mode with pullup */ + XT_CLOCK_IN(); + XT_DATA_IN(); + + XT_INT_ON(); +} + +/* get data received by interrupt */ +uint8_t xt_host_recv(void) +{ + if (pbuf_has_data()) { + return pbuf_dequeue(); + } else { + return 0; + } +} + +ISR(XT_INT_VECT) +{ + /* + * XT signal format consits of 10 or 9 clocks and sends start bits and 8-bit data, + * which should be read on falling edge of clock. + * + * start(0), start(1), bit0, bit1, bit2, bit3, bit4, bit5, bit6, bit7 + * + * Original IBM XT keyboard sends start(0) bit while some of clones don't. + * Start(0) bit is read as low on data line while start(1) as high. + * + * https://github.com/tmk/tmk_keyboard/wiki/IBM-PC-XT-Keyboard-Protocol + */ + static enum { + START, BIT0, BIT1, BIT2, BIT3, BIT4, BIT5, BIT6, BIT7 + } state = START; + static uint8_t data = 0; + + uint8_t dbit = XT_DATA_READ(); + + // This is needed if using PCINT which can be called on both falling and rising edge + //if (XT_CLOCK_READ()) return; + + switch (state) { + case START: + // ignore start(0) bit + if (!dbit) return; + break; + case BIT0 ... BIT7: + data >>= 1; + if (dbit) + data |= 0x80; + break; + } + if (state++ == BIT7) { + pbuf_enqueue(data); + state = START; + data = 0; + } + return; +} + +/*-------------------------------------------------------------------- + * Ring buffer to store scan codes from keyboard + *------------------------------------------------------------------*/ +#define PBUF_SIZE 32 +static uint8_t pbuf[PBUF_SIZE]; +static uint8_t pbuf_head = 0; +static uint8_t pbuf_tail = 0; +static inline void pbuf_enqueue(uint8_t data) +{ + uint8_t sreg = SREG; + cli(); + uint8_t next = (pbuf_head + 1) % PBUF_SIZE; + if (next != pbuf_tail) { + pbuf[pbuf_head] = data; + pbuf_head = next; + } else { + print("pbuf: full\n"); + } + SREG = sreg; +} +static inline uint8_t pbuf_dequeue(void) +{ + uint8_t val = 0; + + uint8_t sreg = SREG; + cli(); + if (pbuf_head != pbuf_tail) { + val = pbuf[pbuf_tail]; + pbuf_tail = (pbuf_tail + 1) % PBUF_SIZE; + } + SREG = sreg; + + return val; +} +static inline bool pbuf_has_data(void) +{ + uint8_t sreg = SREG; + cli(); + bool has_data = (pbuf_head != pbuf_tail); + SREG = sreg; + return has_data; +} +static inline void pbuf_clear(void) +{ + uint8_t sreg = SREG; + cli(); + pbuf_head = pbuf_tail = 0; + SREG = sreg; +}