--- /dev/null
+*.o
+*.swp
+*.d
+*.bak
+*.bck
+*.dcm
+*-cache.lib
--- /dev/null
+ GNU GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
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+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ 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 3 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/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ 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 GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
--- /dev/null
+SGI - PS/2 keyboard and mouse converter
+=======================================
+
+About
+-----
+This project is a converter for connecting PS/2 keyboards and mice to old
+Silicon Graphics computers which had a proprietary keyboard/mouse interface. It
+should work on:
+
+ - 4D series machines
+ - Indigo
+ - Crimson
+ - Onyx
+
+This converter is not necessary, and will not work, for any later SGI machines,
+like the indy, O2, indigo2, Octane, and so on, because they use PS/2 keyboards
+and mice directly.
+
+It's based on an AVR atmega 88/168/328 microcontroller, which reads the PS/2
+keyboard and mouse ports, and translates scancodes and events to the protocol
+and electrical signalling used by the SGI computers. For details on the
+SGI signalling and protocols, see the copy of the keyboard and mouse manpages
+from the section 7 of the IRIX manual, under `doc/`.
+
+Directory structure:
+
+ - `hw` - hardware: kicad files and pdf schematics.
+ - `fw` - firmware for the AVR microcontroller.
+ - `doc` - relevant documentation.
+
+Project website: http://nuclear.mutantstargoat.com/hw/sgikbd
+
+The hardware design and firmware used my previous
+[a500kbd](https://github.com/jtsiomb/a500kbd) project as a base, so if you see
+any leftover references to the Amiga anywhere don't be confused.
+
+License
+-------
+Copyright (C) 2017-2022 John Tsiombikas <nuclear@mutantstargoat.com>
+
+You are free to use, reproduce, modify, and redistribute any part of this
+project, provided you make any derivative work you release, freely available
+under the same terms.
+
+Both hardware designs, and software parts of this project, are released under
+the terms of the GNU General Public License v3, or at your option any later
+version published by the Free Software Foundation. See `LICENSE` for details.
+
+To comply with the license, when releasing derivative hardware designs, you must
+provide the full EDA project files, and of course firmware/software source code.
+Releasing only images of schematics, gerbers, and firmware binaries is *not*
+sufficient for compliance.
--- /dev/null
+keyboard(7)
+
+ NAME
+
+ keyboard - keyboard specifications
+
+ DESCRIPTION
+
+ The keyboard used on the 4D series, Indigo, Crimson and Onyx systems is
+ an up-down encoded 101-key keyboard.
+
+ The keyboard connects to the main electronics cabinet through a shielded
+ partially coiled cord and is detachable at the system cabinet only. The
+ mouse plugs into either side of the keyboard. Ports are provided on both
+ sides of the enclosure to allow access to left-handed and right-handed
+ mouse connectors. The keyboard cord contains low voltage direct current
+ power feeds and two serial links; one for the mouse and one for the
+ keyboard. The keyboard serial link is bidirectional, allowing for
+ control of indicator lights and other keyboard functions. Each time a
+ key is pressed or released, a code is sent via the keyboard serial link.
+ Every key has a different upcode and downcode. All keys function the
+ same way, allowing the system software to use keys in any manner. Auto-
+ repeat is the only function that treats keys differently. When auto-
+ repeat is enabled, a subset of the keys repeat when held down. Multiple
+ key presses/releases result in all key transitions being reported.
+
+ Electrical Interface
+ The keyboard serial I/O interface uses RS423 levels and communicates
+ asynchronously to the system at 600 baud. The format used is one start
+ bit followed by eight data bits, an odd parity bit and one stop bit, with
+ one byte sent per key up or down transition. The idle state and true
+ data bits for the interface are Mark level or -5V, whereas false data
+ bits and the start bit are spaces or +5V.
+
+ The pin assignments for the keyboard connector on machines with DB-15
+ connectors are shown in the following table:
+
+ KEYBOARD CONNECTOR PINOUT
+ ________________________________
+ Pin |_Signal |_Description
+ 1 | GND | Ground
+ 2 | GND | Ground
+ 3 | GND | Ground
+ 4 | KTXD | Keyboard Transmit
+ 5 | KRCD | Keyboard Receive
+ 7 | +12Vdc | Power
+ 8 | +12Vdc | Power
+ 9 | +12Vdc | Power
+ 10 | MTXD | Mouse Transmit
+ 11 | NC | Reserved
+ 12 | NC | Reserved
+ 15 | -12Vdc | Power
+
+ The pin assignments for the DB-9 keyboard connector on the Personal IRIS
+ 4D/20 and 4D/25 machines are shown in the following table for both the
+ CPU connector and the connectors on the keyboard itself. The connectors
+ on each side of the keyboard are identical, so the mouse can be attached
+ on either side.
+
+ KEYBOARD CABLE PINOUT
+ ____________________________________________________
+ Pin |_CPU Signal |_Keyboard Signal |_Description
+ 1 | NC | +5Vdc | Power
+ 2 | KRCD | KTXD | Keyboard to CPU
+ 3 | NC | -5Vdc | Power
+ 4 | -12Vdc | -12Vdc | Power
+ 5 | MRCD | MTXD | Mouse to CPU
+ 6 | GND | GND | Ground
+ 7 | +12Vdc | +12Vdc | Power
+ 8 | KTXD | KRCD | CPU to Keyboard
+ 9 | GND | GND | Ground
+
+ The pin assignments for the DIN-6 keyboard connector on the CPU board of
+ some of the newer systems are shown in the following table:
+
+ KEYBOARD CABLE PINOUT
+ ________________________________
+ Pin |_Signal |_Description
+ 1 | KRCD | Keyboard Receive
+ 2 | MRCD | Mouse Receive
+ 3 | GND | Ground
+ 4 | +8Vdc | Power
+ 5 | KTXD | Keyboard Transmit
+ 6 | -8Vdc | Power
+
+ The pin assignments for the mouse port connector (on the keyboard, not on
+ the CPU) for keyboards with DB9 connector are shown in the following
+ table; either connector on the keyboard can be used for the mouse or for
+ the keyboard cable.
+
+ MOUSE PORT
+ ____________________________
+ Pin |_Signal |_Description
+ 1 | +5V | Power
+ 3 | -5V | Power
+ 5 | MTXD | Transmit Data
+ 9 | GND | Ground
+
+ For machines whose keyboards have the DIN-6 connector on the keyboard, as
+ well as on the CPU, the pinout is shown in the following table. The
+ connectors on both sides of the keyboard have identical pinout, either
+ can be used for the mouse and the cable to the CPU.
+
+ KEYBOARD CONNECTOR PINOUT
+ ____|________|__________________
+ Pin |_Signal |_Description
+
+ 1 KTXD Keyboard Transmit
+ 2 | MTXD | Mouse Transmit
+ 3 | GND | Ground
+ 4 | +8Vdc | Power
+ 5 | KRCD | Keyboard Receive
+ 6 | NC | Not Connected
+
+ Software Interface
+ The interface between the keyboard and the system is 600 baud
+ asynchronous. The format used is one start bit followed by eight data
+ bits, an odd parity bit and one stop bit, with one byte sent per key up
+ or down transition. The MSB of the byte is a 0 for a downstroke and a 1
+ for an upstroke. Control bytes are sent to the keyboard with the same
+ speed and format. The system software does all the processing needed to
+ support functions such as capitalization, control characters, and numeric
+ lock. Auto-repeat for a specified set of characters can be turned on or
+ off by the system software by sending a control byte to the keyboard.
+ When auto-repeat is enabled, a pressed key begins auto-repeating after
+ 0.65 seconds and repeats 28 times per second. The keyboard initializes
+ upon power-up. The configuration request control byte causes the
+ keyboard to send a two-byte sequence to the system. The second byte
+ contains the eight-bit value set on a DIP switch in the keyboard. All
+ keyboard lights (if any; some newer systems have keyboards without user
+ controllable lights) are controlled by the system software by sending
+ control bytes to the keyboard to turn them on or off. Control bytes are
+ also used for long and short beep control and key click disable. When
+ key click is enabled, the keys click when they are pressed. The long
+ beep duration is 1 second and the short beep duration is 0.2 second.
+ There are three lights labeled NUM LOCK, CAPS LOCK, and SCROLL LOCK that
+ are under software control. On older keyboards there are also four
+ general-purpose keyboard lights labeled L1 through L4. The required
+ keycode mappings and control byte formats are shown in the following
+ tables. Note that the legend names prefixed by two asterisks are
+ reserved and not implemented on the keyboard. Legend names prefixed by
+ two exclamation marks do NOT have the auto-repeat enable capability.
+ Legend names prefixed by two dollar signs do NOT have the key click
+ enable capability.
+
+ LEGENDS VS KEYCODES IN DECIMAL
+ _____________________________________________
+ ________Legend |________Code
+ AKEY | 10
+ BKEY | 35
+ CKEY | 27
+ DKEY | 17
+ EKEY | 16
+ FKEY | 18
+ GKEY | 25
+ HKEY | 26
+ IKEY | 39
+ JKEY 33
+ KKEY | 34
+ LKEY | 41
+ MKEY | 43
+ NKEY | 36
+ OKEY | 40
+ PKEY | 47
+ QKEY | 9
+ RKEY | 23
+ SKEY | 11
+ TKEY | 24
+ UKEY | 32
+ VKEY | 28
+ WKEY | 15
+ XKEY | 20
+ YKEY | 31
+ ZKEY | 19
+ ZEROKEY | 45
+ ONEKEY | 7
+ TWOKEY | 13
+ THREEKEY | 14
+ FOURKEY | 21
+ FIVEKEY | 22
+ SIXKEY | 29
+ SEVENKEY | 30
+ EIGHTKEY | 37
+ NINEKEY | 38
+
+ LEGENDS VS KEYCODES IN DECIMAL
+ ____________________________________
+ ________Legend |____Code
+ **!!BREAKKEY | 0
+ **!!SETUPKEY | 1
+ $$!!LEFTCTRL | 2
+ $$!!CAPSLOCKKEY | 3
+ $$!!RIGHTSHIFTKEY | 4
+ $$!!LEFTSHIFTKEY | 5
+ **!!NOSCRLKEY | 12
+ !!ESCKEY | 6
+ !!TABKEY | 8
+ RETURN.ENTER | 50
+ SPACEKEY | 82
+ **LINEFEEDKEY | 59
+ BACKSPACEKEY | 60
+ DELKEY | 61
+ SEMICOLONKEY | 42
+ PERIODKEY | 51
+ COMMAKEY | 44
+ QUOTEKEY" | 49
+ ACCENTGRAVEKEY~ | 54
+
+ MINUSKEY 46
+ VIRGULEKEY? | 52
+ BACKSLASHKEY | 56
+ EQUALKEY | 53
+ LEFTBRACKETKEY | 48
+ RIGHTBRACKETKEY | 55
+ LEFTARROWKEY | 72
+ DOWNARROWKEY | 73
+ RIGHTARROWKEY | 79
+ UPARROWKEY | 80
+ PAD0 | 58
+ PAD1 | 57
+ PAD2 | 63
+ PAD3 | 64
+ PAD4 | 62
+ PAD5 | 68
+ PAD6 | 69
+
+ LEGENDS VS KEYCODES IN DECIMAL
+ ______________________________________
+ ________Legend |_____Code
+ PAD7 | 66
+ PAD8 | 67
+ PAD9 | 74
+ **PADPF1 | 71
+ **PADPF2 | 70
+ **PADPF3 | 78
+ **PADPF4 | 77
+ PADPERIOD | 65
+ PADMINUS | 75
+ **PADCOMMA | 76
+ !!PADENTER | 81
+ $$!!LEFTALT | 83
+ $$!!RIGHTALT | 84
+ $$!!RIGHTCTRL | 85
+ F1 | 86
+ F2 | 87
+ F3 | 88
+ F4 | 89
+ F5 | 90
+ F6 | 91
+ F7 | 92
+ F8 | 93
+ F9 | 94
+ F10 | 95
+ F11 | 96
+ F12 | 97
+ !!PRINT.SCREEN | 98
+ $$!!SCROLL.LOCK | 99
+ !!PAUSE | 100
+
+ !!INSERT 101
+ !!HOME | 102
+ !!PAGEUP | 103
+ !!END | 104
+ !!PAGEDOWN | 105
+ $$!!NUM.LOCK | 106
+ PAD.BKSLASH/ | 107
+
+ LEGENDS VS KEYCODES IN DECIMAL
+ ____________________________________
+ __________Legend |__Code
+ PAD.ASTER* | 108
+ PAD.PLUS+ | 109
+ config byte(1st of 2 bytes) | 110
+ config byte(2nd of 2 bytes) | DIP SW
+ GERlessThan | 111
+ spare1 | 112
+ spare2 | 113
+ spare3 | 114
+ spare4 | 115
+ spare6 | 117
+ spare7 | 118
+ spare8 | 119
+ spare9 | 120
+ spare10 | 121
+
+ KEYCODES IN DECIMAL VS LEGENDS
+ ____________________________________
+ ___Code |_________Legend
+ 0 | **BREAKKEY
+ 1 | **!!SETUPKEY
+ 2 | $$!!LEFTCTRL
+ 3 | $$!!CAPSLOCKKEY
+ 4 | $$!!RIGHTSHIFTKEY
+ 5 | $$!!LEFTSHIFTKEY
+ 6 | !!ESCKEY
+ 7 | ONEKEY
+ 8 | !!TABKEY
+ 9 | QKEY
+ 10 | AKEY
+ 11 | SKEY
+ 12 | **!!NOSCRLKEY
+ 13 | TWOKEY
+ 14 | THREEKEY
+ 15 | WKEY
+ 16 | EKEY
+ 17 | DKEY
+ 18 | FKEY
+ 19 | ZKEY
+ 20 | XKEY
+
+ 21 FOURKEY
+ 22 | FIVEKEY
+ 23 | RKEY
+ 24 | TKEY
+ 25 | GKEY
+ 26 | HKEY
+ 27 | CKEY
+ 28 | VKEY
+ 29 | SIXKEY
+ 30 | SEVENKEY
+ 31 | YKEY
+ 32 | UKEY
+ 33 | JKEY
+ 34 | KKEY
+ 35 | BKEY
+
+ KEYCODES IN DECIMAL VS LEGENDS
+ ______________________________________
+ ____Code |_________Legend
+ 36 | NKEY
+ 37 | EIGHTKEY
+ 38 | NINEKEY
+ 39 | IKEY
+ 40 | OKEY
+ 41 | LKEY
+ 42 | SEMICOLONKEY
+ 43 | MKEY
+ 44 | COMMAKEY
+ 45 | ZEROKEY
+ 46 | MINUSKEY
+ 47 | PKEY
+ 48 | LEFTBRACKET
+ 49 | QUOTEKEY
+ 50 | RETURN.ENTER
+ 51 | PERIODKEY
+ 52 | VIRGULEKEY
+ 53 | EQUALKEY
+ 54 | ACCENTGRAVEKEY
+ 55 | RIGHTBRACKETKEY
+ 56 | BACKSLASHKEY
+ 57 | PADONEKEY
+ 58 | PADZEROKEY
+ 59 | **LINEFEEDKEY
+ 60 | BACKSPACEKEY
+ 61 | DELETEKEY
+ 62 | PADFOURKEY
+ 63 | PADTWOKEY
+ 64 | PADTHREEKEY
+ 65 | PADPERIODKEY
+ 66 | PADSEVENKEY
+
+ 67 PADEIGHTKEY
+ 68 | PADFIVEKEY
+ 69 | PADSIXKEY
+ 70 | **PADPF2KEY
+ 71 | **PADPF1KEY
+
+ KEYCODES IN DECIMAL VS LEGENDS
+ ______________________________________
+ ____Code |_________Legend
+ 72 | LEFTARROWKEY
+ 73 | DOWNARROWKEY
+ 74 | PADNINEKEY
+ 75 | PADMINUSKEY
+ 76 | **PADCOMMAKEY
+ 77 | **PADPF4KEY
+ 78 | **PADPF3KEY
+ 79 | RIGHTARROWKEY
+ 80 | UPARROWKEY
+ 81 | !!PADENTERKEY
+ 82 | SPACEKEY
+ 83 | $$!!LEFTALT
+ 84 | $$!!RIGHTALT
+ 85 | $$!!RIGHTCTRL
+ 86 | F1
+ 87 | F2
+ 88 | F3
+ 89 | F4
+ 90 | F5
+ 91 | F6
+ 92 | F7
+ 93 | F8
+ 94 | F9
+ 95 | F10
+ 96 | F11
+ 97 | F12
+ 98 | !!PRINT.SCREEN
+ 99 | $$!!SCROLL.LOCK
+ 100 | !!PAUSE
+ 101 | !!INSERT
+ 102 | !!HOME
+ 103 | !!PAGEUP
+ 104 | !!END
+ 105 | !!PAGEDOWN
+ 106 | $$!!NUM.LOCK
+ 107 | PAD.BKSLASH/
+
+ KEYCODES IN DECIMAL VS LEGENDS
+ ____________________________________
+ _Code |___________Legend
+ 108 | PAD.ASTER*
+
+ 109 PAD.PLUS+
+ 110 | config byte(1st of 2 bytes)
+ DIP SW | config byte(2nd of 2 bytes)
+
+ CONTROL BYTES RECOGNIZED BY KEYBOARD
+ _________________________________________________________
+ BIT | DESCRIPTION
+ TRUE |_________BIT 0 = 0 |_______BIT 0 = 1
+ 1 | short beep | complement ds1 and ds2
+ 2 | long beep | ds3
+ 3 | click disable | ds4
+ 4 | return configuration byte | ds5
+ 5 | ds1 | ds6
+ 6 | ds2 | ds7
+ 7 | enable auto-repeat | not used
+
+ DISPLAY LABELS
+ _________________________________
+ DISPLAY DESIGNATION |____LABEL
+ ds1 | NUM LOCK
+ ds2 | CAPS LOCK
+ ds3 | SCROLL LOCK
+ ds4 | L1
+ ds5 | L2
+ ds6 | L3
+ ds7 | L4
+
+ NOTE
+
+ Indy, Indigo2, O2, OCTANE and Onyx2 use a PS/2 style keyboard (detailed
+ in pckeyboard(7)) that uses a different scan code set. This difference
+ may break compatibility for some programs that operate with raw scan
+ codes.
+
+ SEE ALSO
+
+ keyboard(1), mouse(7), pckeyboard(7), pcmouse(7).
--- /dev/null
+mouse(7)
+
+ NAME
+
+ mouse - mouse specifications
+
+ DESCRIPTION
+
+ A serial mouse is used on the SGI 4D series, Indigo, Crimson and Onyx
+ systems. This mouse differs from other systems which use the mouse
+ described in pcmouse(7).
+
+ Signals
+ The serial data interface signal level is compatible with RS-423, which
+ has roughly a 10V swing centered about ground. The idle state and true
+ data bits for the interface are Mark level or -5V whereas false data bits
+ and the start bit are spaces or +5V. The serial data is transmitted at
+ 4800 baud with one start bit, eight data bits, and no parity.
+
+ Protocol
+ The mouse provides a five-byte data block whenever there is a change of
+ position or button state. The first byte is a sync byte that has its
+ upper five bits set to 10000 and its lower three bits indicating the
+ button states where a 0 indicates depression. The sync byte looks like
+ this: 10000LMR. The next four bytes contain two difference updates of
+ the mouse's change in position: X1, Y1, X2, and Y2. Positive values
+ indicate movement to the right or upward. System software ignores bytes
+ beyond the first five until reception of the next sync byte.
+
+ Pinout
+ The pinout of the mouse connector on the keyboard is on the keyboard(7)
+ reference page.
+
+ NOTE
+
+ Indy, Indigo2, O2, OCTANE and Onyx2 use a PS/2 style mouse, which is
+ described in pcmouse(7).
+
+ SEE ALSO
+
+ keyboard(7), pckeyboard(7), pcmouse(7).
--- /dev/null
+src = $(wildcard src/*.c)
+obj = $(src:.c=.o)
+bin = sgikbd
+hex = $(bin).hex
+eep = $(bin).eep
+
+mcu_gcc = atmega168
+mcu_dude = m168
+
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+
+CFLAGS = -Os -pedantic -Wall -mmcu=$(mcu_gcc) -DF_CPU=14745600
+LDFLAGS = -Wl,-Map,$(bin).map -mmcu=$(mcu_gcc) -lprintf_min
+
+.PHONY: all
+all: $(hex) $(eep)
+
+$(bin): $(obj)
+ $(CC) -o $@ $(obj) $(LDFLAGS)
+
+$(hex): $(bin)
+ $(OBJCOPY) -j .text -j .data -O ihex -R .eeprom $< $@
+
+$(eep): $(bin)
+ $(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
+
+.PHONY: fuses
+fuses:
+ avrdude -c usbtiny -p $(mcu_dude) -U lfuse:w:0xe6:m -U hfuse:w:0xdf:m -U efuse:w:0xf9:m
+
+.PHONY: program
+program: $(hex)
+ avrdude -c usbtiny -p $(mcu_dude) -e -U flash:w:$(hex)
+
+.PHONY: clean
+clean:
+ rm -f $(bin) $(obj) $(hex) $(eep) $(bin).map
--- /dev/null
+#ifndef DEFS_H_
+#define DEFS_H_
+
+#include <avr/io.h>
+
+/* pin assignments:
+ * D2 PS/2 clock (INT0)
+ * D3 amikbd clock (INT1)
+ * D4 PS/2 data
+ * D5 amikbd data
+ * D6 amiga reset
+ * D7 amiga drvled in
+ */
+
+#define PCLK 2
+#define ACLK 3
+#define PDATA 4
+#define ADATA 5
+#define ARST 6
+#define ADRVLED 7
+
+#define PCLK_BIT (1 << PCLK)
+#define ACLK_BIT (1 << ACLK)
+#define PDATA_BIT (1 << PDATA)
+#define ADATA_BIT (1 << ADATA)
+#define ARST_BIT (1 << ARST)
+#define ADRVLED_BIT (1 << ADRVLED)
+
+#endif /* DEFS_H_ */
--- /dev/null
+#include <stdio.h>
+#include <ctype.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "serial.h"
+#include "scantbl.h"
+#include "ps2kbd.h"
+#include "amigakb.h"
+#include "defs.h"
+#include "timer.h"
+
+enum {
+ KF_BRK = 1,
+ KF_EXT = 2,
+ KF_EXT1 = 4,
+
+ KF_CTRL = 16,
+ KF_LAMIGA = 32,
+ KF_RAMIGA = 64
+};
+#define KF_TRANSIENT 0x0f
+#define KF_STICKY 0xf0
+
+#define RESET_WAIT 1000
+
+static unsigned char led_state;
+
+int main(void)
+{
+ unsigned int keyflags = 0;
+ unsigned char c, keycode, prev_drvled = 0;
+ int press;
+
+ /* disable all pullups globally */
+ MCUCR |= 1 << PUD;
+
+ DDRD = 0;
+ PORTD = 0;
+ EIMSK = 0; /* mask external interrupts */
+ EICRA = (1 << ISC11) | (1 << ISC01); /* falling edge interrupts */
+
+ init_timer();
+
+ /* initialize the UART and enable interrupts */
+ init_serial(9600);
+ sei();
+
+ printf("PS/2 keyboard controller - John Tsiombikas <nuclear@member.fsf.org>\r\n");
+
+ EIMSK = (1 << INT0) | (1 << INT1); /* enable ps/2 clock interrupt */
+
+ ps2setled(0); /* start with all LEDs off */
+
+ for(;;) {
+ while(!ps2pending()) {
+ unsigned char drvled = PIND & ADRVLED_BIT;
+ if(drvled != prev_drvled) {
+ prev_drvled = drvled;
+ if(drvled) {
+ led_state |= PS2LED_SCRLK;
+ } else {
+ led_state &= ~PS2LED_SCRLK;
+ }
+ ps2setled(led_state);
+ }
+ }
+
+ c = ps2read();
+ switch(c) {
+ case 0xe0: /* extended */
+ keyflags |= KF_EXT;
+ break;
+
+ case 0xe1: /* extended */
+ keyflags |= KF_EXT1;
+ break;
+
+ case 0xf0: /* break code */
+ keyflags |= KF_BRK;
+ break;
+
+ default:
+ press = !(keyflags & KF_BRK);
+
+ keycode = 0xff;
+ if(keyflags & KF_EXT) {
+ if(c < KEYMAP_EXT_SIZE) {
+ keycode = keymap_ext[(int)c];
+ }
+ } else if(keyflags & KF_EXT1) {
+ } else {
+ if(c < KEYMAP_NORMAL_SIZE) {
+ keycode = keymap_normal[(int)c];
+ }
+ }
+
+ switch(keycode) {
+ case AMIKEY_CTRL:
+ if(press)
+ keyflags |= KF_CTRL;
+ else
+ keyflags &= ~KF_CTRL;
+ break;
+
+ case AMIKEY_LAMI:
+ if(press)
+ keyflags |= KF_LAMIGA;
+ else
+ keyflags &= ~KF_LAMIGA;
+ break;
+
+ case AMIKEY_RAMI:
+ if(press)
+ keyflags |= KF_RAMIGA;
+ else
+ keyflags &= ~KF_RAMIGA;
+ break;
+
+ default:
+ break;
+ }
+
+ if((keyflags & (KF_CTRL | KF_RAMIGA | KF_LAMIGA)) == (KF_CTRL | KF_RAMIGA | KF_LAMIGA)) {
+ printf("CTRL - AMIGA - AMIGA!\r\n");
+ amikb_reset();
+
+ keyflags = 0;
+
+ reset_timer();
+ while(get_msec() < RESET_WAIT);
+ ps2clearbuf();
+
+ break;
+ }
+
+ if(keycode != 0xff) {
+ int press = ~keyflags & KF_BRK;
+ amikb_sendkey(keycode, press);
+ if(keycode == 0x62 && press) {
+ led_state ^= PS2LED_CAPSLK;
+ ps2setled(led_state);
+ }
+ /*printf("scancode %x -> [%s] amiga key %xh\r\n", (unsigned int)c, press ? "press" : "release", keycode);*/
+ } else {
+ printf("PS/2 unknown command or keycode: %x\r\n", (unsigned int)c);
+ }
+ keyflags &= ~KF_TRANSIENT;
+ }
+ }
+ return 0;
+}
--- /dev/null
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "ps2kbd.h"
+#include "defs.h"
+#include "timer.h"
+
+#define TIMEOUT 100
+
+#define BUF_SZ 32
+#define BUF_IDX_MASK (BUF_SZ - 1)
+#define NEXT_IDX(x) (((x) + 1) & BUF_IDX_MASK)
+static volatile unsigned char keybuf[BUF_SZ];
+static volatile unsigned char key_rd, key_wr;
+
+static volatile int send_nbits, wait_ack;
+static volatile unsigned char send_val, send_par;
+
+static void abort_send(void);
+
+int ps2write(unsigned char c)
+{
+ cli();
+ send_nbits = 10;
+ send_val = c;
+ send_par = 0; /* init to 0, will be calculated while sending */
+
+ /* inhibit transmission, hold at least 100us */
+ PORTD &= ~PCLK_BIT;
+ DDRD |= PCLK_BIT;
+ EIFR |= (1 << INTF0); /* clear pending interrupt due to clock transition */
+ sei();
+ _delay_us(100);
+
+ /* RTS by data low & release clock (this counts as start bit?) */
+ PORTD &= ~PDATA_BIT;
+ DDRD |= PDATA_BIT;
+ DDRD &= ~PCLK_BIT;
+
+ reset_timer();
+ while(send_nbits > 0) {
+ if(get_msec() > TIMEOUT) {
+ abort_send();
+ return -1;
+ }
+ }
+ _delay_us(5);
+
+ /* release data line and wait for ack */
+ cli();
+ wait_ack = 1;
+ sei();
+ DDRD &= ~PDATA_BIT;
+ reset_timer();
+ while(wait_ack) {
+ if(get_msec() > TIMEOUT) {
+ abort_send();
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static void abort_send(void)
+{
+ cli();
+ send_nbits = 0;
+ wait_ack = 0;
+ /* hold clock low for 100us */
+ PORTD &= ~PCLK_BIT;
+ DDRD |= PCLK_BIT;
+ _delay_us(100);
+ DDRD &= ~(PCLK_BIT | PDATA_BIT);
+ EIFR |= (1 << INTF0); /* clear pending interrupt */
+ sei();
+}
+
+unsigned char ps2read(void)
+{
+ unsigned char key;
+
+ while(key_rd == key_wr) {
+ }
+
+ cli();
+ key = keybuf[key_rd];
+ key_rd = NEXT_IDX(key_rd);
+ sei();
+
+ return key;
+}
+
+int ps2pending(void)
+{
+ return key_rd != key_wr;
+}
+
+int ps2wait(unsigned int timeout)
+{
+ reset_timer();
+ while(key_rd == key_wr) {
+ if(get_msec() >= timeout) return -1;
+ }
+ return 0;
+}
+
+#define PS2_ACK 0xfa
+#define PS2_RESEND 0xfe
+#define PS2_ECHO 0xee
+
+int ps2setled(unsigned char state)
+{
+ unsigned char c;
+
+ ps2write(0xed);
+ reset_timer();
+ while(!ps2pending()) {
+ if(get_msec() >= TIMEOUT) return -1;
+ }
+ c = ps2read();
+ /*printf("ps2setled 1st response: %x\r\n", (unsigned int)c);*/
+ if(c != PS2_ACK) return -1;
+
+ ps2write(state);
+ reset_timer();
+ while(!ps2pending()) {
+ if(get_msec() >= TIMEOUT) return -1;
+ }
+ c = ps2read();
+ /*printf("ps2setled 2nd response: %x\r\n", (unsigned int)c);*/
+ if(c != PS2_ACK) return -1;
+
+ return 0;
+}
+
+void ps2clearbuf(void)
+{
+ key_rd = key_wr;
+}
+
+ISR(INT0_vect)
+{
+ static unsigned char value, parity;
+ /*static unsigned char valp;*/
+ static int nbits;
+
+ if(wait_ack) {
+ if(!(PIND & PDATA_BIT)) {
+ wait_ack = 0;
+ }
+ return;
+ }
+
+ if(send_nbits > 0) {
+ --send_nbits;
+ switch(send_nbits) {
+ case 1: /* parity bit */
+ if(send_par & 1) { /* odd number of ones: parity 0 */
+ PORTD &= ~PDATA_BIT;
+ } else { /* even number of ones: parity 1 */
+ PORTD |= PDATA_BIT;
+ }
+ break;
+ case 0: /* stop bit: 1 */
+ PORTD |= PDATA_BIT;
+ break;
+ default:
+ if(send_val & 1) {
+ PORTD |= PDATA_BIT;
+ ++send_par;
+ } else {
+ PORTD &= ~PDATA_BIT;
+ }
+ send_val >>= 1;
+ }
+
+ } else {
+ if(nbits > 0 && nbits < 9) {
+ value >>= 1;
+ if(PIND & PDATA_BIT) {
+ value |= 0x80;
+ parity ^= 1;
+ }
+ }/* else if(nbits == 9) {
+ valp = (PIND >> PDATA) & 1;
+ }*/
+ if(++nbits >= 11) {
+ nbits = 0;
+
+ /* check parity */
+ /*if((parity & 1) == (valp & 1)) {}*/
+ keybuf[key_wr] = (unsigned char)value;
+ key_wr = NEXT_IDX(key_wr);
+
+ value = 0;
+ parity = 0;
+ }
+ }
+}
--- /dev/null
+#ifndef PS2KBD_H_
+#define PS2KBD_H_
+
+enum {
+ PS2LED_SCRLK = 1,
+ PS2LED_NUMLK = 2,
+ PS2LED_CAPSLK = 4
+};
+
+int ps2write(unsigned char c);
+unsigned char ps2read(void);
+int ps2pending(void);
+int ps2wait(unsigned int timeout);
+void ps2clearbuf(void);
+
+int ps2setled(unsigned char state);
+
+#endif /* PS2KBD_H_ */
--- /dev/null
+#ifndef SCANTBL_H_
+#define SCANTBL_H_
+
+/*
+enum {
+ KEY_ESC = 27,
+
+ KEY_F1 = 256,
+ KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7, KEY_F8,
+ KEY_F9, KEY_F10, KEY_F11, KEY_F12, KEY_SYSRQ, KEY_BRK,
+ KEY_SCRLK, KEY_CAPSLK, KEY_NUMLK,
+
+ KEY_LSHIFT, KEY_RSHIFT,
+ KEY_LCTRL, KEY_RCTRL,
+ KEY_LALT, KEY_RALT,
+ KEY_LWIN, KEY_RWIN, KEY_MENU,
+
+ KEY_INS, KEY_DEL, KEY_HOME, KEY_END, KEY_PGUP, KEY_PGDOWN,
+ KEY_LEFT, KEY_RIGHT, KEY_UP, KEY_DOWN,
+
+ KEY_KP_0, KEY_KP_1, KEY_KP_2, KEY_KP_3, KEY_KP_4,
+ KEY_KP_5, KEY_KP_6, KEY_KP_7, KEY_KP_8, KEY_KP_9,
+ KEY_KP_DIV, KEY_KP_MUL, KEY_KP_MINUS, KEY_KP_PLUS,
+ KEY_KP_DOT, KEY_KP_ENTER,
+
+ KEY_MM_WWW_SEARCH, KEY_MM_WWW_FAV, KEY_MM_WWW_REFRESH, KEY_MM_WWW_STOP,
+ KEY_MM_WWW_FWD, KEY_MM_WWW_BACK, KEY_MM_WWW_HOME,
+ KEY_MM_PREV, KEY_MM_NEXT, KEY_MM_PLAY, KEY_MM_STOP, KEY_MM_VOLUP, KEY_MM_VOLDOWN,
+ KEY_MM_MUTE, KEY_MM_CALC, KEY_MM_MYCOMP, KEY_MM_EMAIL, KEY_MM_SELECT,
+ KEY_APPS,
+ KEY_ACPI_POWER, KEY_ACPI_SLEEP, KEY_ACPI_WAKEUP
+};
+*/
+
+#define KEYMAP_NORMAL_SIZE (sizeof keymap_normal / sizeof *keymap_normal)
+#if 0
+static int keymap_normal[] = {
+ 0, KEY_F9, 0, KEY_F5, KEY_F3, KEY_F1, KEY_F2, KEY_F12, /* 00 - 07 */
+ 0, KEY_F10, KEY_F8, KEY_F6, KEY_F4, '\t', '`', 0, /* 08 - 0f */
+ 0, KEY_LALT, KEY_LSHIFT, 0, KEY_LCTRL, 'Q', '1', 0, /* 10 - 17 */
+ 0, 0, 'Z', 'S', 'A', 'W', '2', 0, /* 18 - 1f */
+ 0, 'C', 'X', 'D', 'E', '4', '3', 0, /* 20 - 27 */
+ 0, ' ', 'V', 'F', 'T', 'R', '5', 0, /* 28 - 2f */
+ 0, 'N', 'B', 'H', 'G', 'Y', '6', 0, /* 30 - 37 */
+ 0, 0, 'M', 'J', 'U', '7', '8', 0, /* 38 - 3f */
+ 0, ',', 'K', 'I', 'O', '0', '9', 0, /* 40 - 47 */
+ 0, '.', '/', 'L', ';', 'P', '-', 0, /* 48 - 4f */
+ 0, 0, '\'', 0, '[', '=', 0, 0, /* 50 - 57 */
+ KEY_CAPSLK, KEY_RSHIFT, '\n', ']', 0, '\\', 0, 0, /* 58 - 5f */
+ 0, 0, 0, 0, 0, 0, '\b', 0, /* 60 - 67 */
+ 0, KEY_KP_1, 0, KEY_KP_4, KEY_KP_7, 0, 0, 0, /* 68 - 6f */
+ KEY_KP_0, KEY_KP_DOT, KEY_KP_2, KEY_KP_5, KEY_KP_6, KEY_KP_8, KEY_ESC, KEY_NUMLK, /* 70 - 77 */
+ KEY_F11, KEY_KP_PLUS, KEY_KP_3, KEY_KP_MINUS, KEY_KP_MUL, KEY_KP_9, KEY_SCRLK, 0,/* 78 - 7f */
+ 0, 0, 0, KEY_F7 /* 80 - 83 */
+};
+#endif
+
+/* converts a normal (non-extended) PS/2 scancode to an amiga rawkey value
+ * caps lock -> control
+ * ctrl -> amiga
+ * F12 -> help
+ */
+static unsigned char keymap_normal[] = {
+ 0xff, 0x58, 0xff, 0x54, 0x52, 0x50, 0x51, 0x5f, /* 00 - 07: - f9 - f5 f3 f1 f2 f12 */
+ 0xff, 0x59, 0x57, 0x55, 0x53, 0x42, 0x00, 0xff, /* 08 - 0f: - f10 f8 f6 f4 tab ` - */
+ 0xff, 0x64, 0x60, 0xff, 0x66, 0x10, 0x01, 0xff, /* 10 - 17: - lalt lshift - lctrl(lamiga) Q 1 - */
+ 0xff, 0xff, 0x31, 0x21, 0x20, 0x11, 0x02, 0xff, /* 18 - 1f: - - Z S A W 2 - */
+ 0xff, 0x33, 0x32, 0x22, 0x12, 0x04, 0x03, 0xff, /* 20 - 27: - C X D E 4 3 - */
+ 0xff, 0x40, 0x34, 0x23, 0x14, 0x13, 0x05, 0xff, /* 28 - 2f: - space V F T R 5 - */
+ 0xff, 0x36, 0x35, 0x25, 0x24, 0x15, 0x06, 0xff, /* 30 - 37: - N B H G Y 6 - */
+ 0xff, 0xff, 0x37, 0x26, 0x16, 0x07, 0x08, 0xff, /* 38 - 3f: - - M J U 7 8 - */
+ 0xff, 0x38, 0x27, 0x17, 0x18, 0x0a, 0x09, 0xff, /* 40 - 47: - , K I O 0 9 - */
+ 0xff, 0x39, 0x3a, 0x28, 0x29, 0x19, 0x0b, 0xff, /* 48 - 4f: - . / L ; P minus - */
+ 0xff, 0xff, 0x2a, 0xff, 0x1a, 0x0c, 0xff, 0xff, /* 50 - 57: - - \ - [ = - - */
+ 0x63, 0x61, 0x44, 0x1b, 0xff, 0x0d, 0xff, 0xff, /* 58 - 5f: caps rshift enter ] - \ - - */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x41, 0xff, /* 60 - 67: - - - - - - backsp - */
+ 0xff, 0x1d, 0xff, 0x2d, 0x3d, 0xff, 0xff, 0xff, /* 68 - 6f: - KP1 - KP4 KP7 - - - */
+ 0x0f, 0x3c, 0x1e, 0x2e, 0x2f, 0x3e, 0x45, 0x5a, /* 70 - 77: KP0 KP. KP2 KP5 KP6 KP8 esc numlk */
+ 0xff, 0x5e, 0x1f, 0x4a, 0x5d, 0x3f, 0x62, 0xff, /* 78 - 7f: f11 KP+ KP3 KP- KP* KP9 scrlk(capslock) - */
+ 0xff, 0xff, 0xff, 0x56 /* 80 - 83: - - - f7 */
+};
+
+#define KEYMAP_EXT_SIZE (sizeof keymap_ext / sizeof *keymap_ext)
+#if 0
+static int keymap_ext[] = {
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 00 - 07 */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 08 - 0f */
+ KEY_MM_WWW_SEARCH, KEY_RALT, 0, 0, KEY_RCTRL, KEY_MM_PREV, 0, 0, /* 10 - 17 */
+ KEY_MM_WWW_FAV, 0, 0, 0, 0, 0, 0, KEY_LWIN, /* 18 - 1f */
+ KEY_MM_WWW_REFRESH, KEY_MM_VOLDOWN, 0, KEY_MM_MUTE, 0, 0, 0, KEY_RWIN, /* 20 - 27 */
+ KEY_MM_STOP, 0, 0, KEY_MM_CALC, 0, 0, 0, KEY_APPS, /* 28 - 2f */
+ KEY_MM_WWW_FWD, 0, KEY_MM_VOLUP, 0, KEY_MM_PLAY, 0, 0, KEY_ACPI_POWER, /* 30 - 37 */
+ KEY_MM_WWW_BACK, 0, KEY_MM_WWW_HOME, KEY_MM_STOP, 0, 0, 0, KEY_ACPI_SLEEP, /* 38 - 3f */
+ KEY_MM_MYCOMP, 0, 0, 0, 0, 0, 0, 0, /* 40 - 47 */
+ KEY_MM_EMAIL, 0, KEY_KP_DIV, 0, 0, KEY_MM_NEXT, 0, 0, /* 48 - 4f */
+ KEY_MM_SELECT, 0, 0, 0, 0, 0, 0, 0, /* 50 - 57 */
+ 0, 0, KEY_KP_ENTER, 0, 0, 0, KEY_ACPI_WAKEUP, 0, /* 58 - 5f */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* 60 - 67 */
+ 0, KEY_END, 0, KEY_LEFT, KEY_HOME, 0, 0, 0, /* 68 - 6f */
+ KEY_INS, KEY_DEL, KEY_DOWN, 0, KEY_RIGHT, KEY_UP, 0, 0, /* 70 - 77 */
+ 0, 0, KEY_PGDOWN, 0, 0, KEY_PGUP, 0, 0, /* 78 - 7f */
+};
+#endif
+
+static unsigned char keymap_ext[] = {
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 00 - 07: - - - - - - - - */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 08 - 0f: - - - - - - - - */
+ 0xff, 0x65, 0xff, 0xff, 0x67, 0xff, 0xff, 0xff, /* 10 - 17: - ralt - - rctrl(ramiga) - - - */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x66, /* 18 - 1f: - - - - - - - lwin(lamiga) */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x67, /* 20 - 27: - - - - - - - rwin(ramiga) */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 28 - 2f */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 30 - 37 */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 38 - 3f */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 40 - 47 */
+ 0xff, 0xff, 0x5c, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 - 4f: - - KP/ - - - - - */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 50 - 57 */
+ 0xff, 0xff, 0x43, 0xff, 0xff, 0xff, 0xff, 0xff, /* 58 - 5f: - - KP_enter - - - - - */
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 60 - 67 */
+ 0xff, 0x1d, 0xff, 0x4f, 0x3d, 0xff, 0xff, 0xff, /* 68 - 6f: - end - left home - - - */
+ 0x0f, 0x46, 0x4d, 0xff, 0x4e, 0x4c, 0xff, 0xff, /* 70 - 77: ins del down - right up - - */
+ 0xff, 0xff, 0x1f, 0xff, 0xff, 0x3f, 0xff, 0xff /* 78 - 7f: - - pgdown - - pgup - - */
+};
+
+/* some useful keycodes */
+#define AMIKEY_CTRL 0x63
+#define AMIKEY_LAMI 0x66
+#define AMIKEY_RAMI 0x67
+
+#endif /* SCANTBL_H_ */
--- /dev/null
+#ifndef F_CPU
+#ifdef XTAL
+#define F_CPU XTAL
+#else
+#warning "compiled for 1mhz internal rc osc. serial comms won't work"
+#define F_CPU 1000000
+#endif
+#endif
+
+#include <stdio.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include <avr/power.h>
+
+static int uart_send_char(char c, FILE *fp);
+static int uart_get_char(FILE *fp);
+
+#define BUF_SZ 16
+#define BUF_IDX_MASK (BUF_SZ - 1)
+#define NEXT_IDX(x) (((x) + 1) & BUF_IDX_MASK)
+static char outbuf[BUF_SZ];
+static volatile unsigned char out_rd, out_wr;
+static char inbuf[BUF_SZ];
+static volatile unsigned char in_rd, in_wr;
+
+static FILE std_stream = FDEV_SETUP_STREAM(uart_send_char, uart_get_char, _FDEV_SETUP_RW);
+
+
+
+void init_serial(long baud)
+{
+ unsigned int ubrr_val = F_CPU / 16 / baud - 1;
+
+ power_usart0_enable();
+
+ /* set baud generator timer reset value */
+ UBRR0H = (unsigned char)(ubrr_val >> 8);
+ UBRR0L = (unsigned char)ubrr_val;
+
+ /* enable rx/tx and recv interrupt */
+ UCSR0B = (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0);
+ /* set frame format: 8n1 */
+ UCSR0C = 3 << UCSZ00;
+
+ stdin = stdout = stderr = &std_stream;
+}
+
+int have_input(void)
+{
+ return in_wr != in_rd;
+}
+
+static int uart_send_char(char c, FILE *fp)
+{
+ /*int next;*/
+
+ while((UCSR0A & (1 << UDRE0)) == 0);
+ UDR0 = (unsigned char)c;
+#if 0
+ next = NEXT_IDX(out_wr);
+ while(next == out_rd);
+
+ outbuf[out_wr] = c;
+ out_wr = next;
+
+ /* enable the Tx data register empty interrupt */
+ UCSR0B |= 1 << UDRIE0;
+#endif
+ return 0;
+}
+
+static int uart_get_char(FILE *fp)
+{
+ char c;
+
+ while(in_rd == in_wr);
+
+ c = inbuf[in_rd];
+ in_rd = NEXT_IDX(in_rd);
+ return c;
+}
+
+ISR(USART_RX_vect)
+{
+ char c = UDR0;
+
+ inbuf[in_wr] = c;
+ in_wr = NEXT_IDX(in_wr);
+}
+
+/* USART Tx data register empty (can send more data) */
+ISR(USART_UDRE_vect)
+{
+ if(out_rd != out_wr) {
+ UDR0 = outbuf[out_rd];
+ out_rd = NEXT_IDX(out_rd);
+ } else {
+ /* no more data to send for now, disable the interrupt */
+ UCSR0B &= ~(1 << UDRIE0);
+ }
+}
--- /dev/null
+#ifndef SERIAL_H_
+#define SERIAL_H_
+
+void init_serial(long baud);
+int have_input(void);
+
+#endif /* SERIAL_H_ */
--- /dev/null
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <avr/power.h>
+#include "timer.h"
+
+#define PRESCL_256 4
+/* 256 ticks per interrupt, 256 clock divisor */
+#define TICKS_PER_SEC (F_CPU / 256 / 256)
+
+static volatile unsigned long ticks;
+
+void init_timer(void)
+{
+ power_timer0_enable();
+
+ TCCR0A = 0;
+ TCCR0B = PRESCL_256;
+
+ TIMSK0 |= (1 << TOIE0); /* enable ovf intr. */
+}
+
+void reset_timer(void)
+{
+ ticks = 0;
+}
+
+unsigned long get_msec(void)
+{
+ return 1000 * ticks / TICKS_PER_SEC;
+}
+
+ISR(TIMER0_OVF_vect)
+{
+ ++ticks;
+}
--- /dev/null
+#ifndef TIMER_H_
+#define TIMER_H_
+
+void init_timer(void);
+void reset_timer(void);
+unsigned long get_msec(void);
+
+#endif /* TIMER_H_ */
--- /dev/null
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# a500kbd_conn
+#
+DEF a500kbd_conn U 0 40 Y Y 1 F N
+F0 "U" -250 -400 60 H V C CNN
+F1 "a500kbd_conn" 250 50 60 V V C CNN
+F2 "" 300 -650 60 H I C CNN
+F3 "" 300 -650 60 H I C CNN
+DRAW
+S -300 250 200 -350 0 1 0 N
+X CLK 1 -500 100 200 R 50 50 1 1 P
+X DATA 2 -500 200 200 R 50 50 1 1 P
+X RESET 3 -500 -50 200 R 50 50 1 1 P
+X +5v 4 100 450 200 D 50 50 1 1 P
+X GND 6 100 -550 200 U 50 50 1 1 P
+X STLED 7 -500 -200 200 R 50 50 1 1 P
+X DRVLED 8 -500 -300 200 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# ps2conn
+#
+DEF ps2conn U 0 40 Y Y 1 F N
+F0 "U" -250 -250 60 H V C CNN
+F1 "ps2conn" 150 0 60 V V C CNN
+F2 "" 0 0 60 H I C CNN
+F3 "" 0 0 60 H I C CNN
+DRAW
+S -300 200 100 -200 0 1 0 N
+X DATA 1 -500 100 200 R 50 50 1 1 P
+X GND 3 0 -400 200 U 50 50 1 1 P
+X VCC 4 0 400 200 D 50 50 1 1 P
+X CLK 5 -500 -100 200 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+update=Mon 05 Oct 2020 01:13:11 PM EEST
+version=1
+last_client=kicad
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[general]
+version=1
+[eeschema]
+version=1
+LibDir=
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title "SGI - PS/2 keyboard and mouse converter"
+Date "2017-10-11"
+Rev "1"
+Comp "Mutant Stargoat"
+Comment1 "Creative Commons Attribution Share-Alike (CC BY-SA)"
+Comment2 "Copyright (C) 2017-2022 John Tsiombikas <nuclear@member.fsf.org>"
+Comment3 ""
+Comment4 ""
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+$Comp
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+$EndComp
+$Comp
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projects / sgikbd / commitdiff