213 lines
6.4 KiB
C
213 lines
6.4 KiB
C
/*
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NeXT non-ADB Keyboard Protocol
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Copyright 2013, Benjamin Gould (bgould@github.com)
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Based on:
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TMK firmware code Copyright 2011,2012 Jun WAKO <wakojun@gmail.com>
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Arduino code by "Ladyada" Limor Fried (http://ladyada.net/, http://adafruit.com/), released under BSD license
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Timing reference thanks to http://m0115.web.fc2.com/ (dead link), http://cfile7.uf.tistory.com/image/14448E464F410BF22380BB
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Pinouts thanks to http://www.68k.org/~degs/nextkeyboard.html
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Keycodes from http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-6/src/sys/arch/next68k/dev/
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This software is licensed with a Modified BSD License.
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All of this is supposed to be Free Software, Open Source, DFSG-free,
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GPL-compatible, and OK to use in both free and proprietary applications.
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Additions and corrections to this file are welcome.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <util/atomic.h>
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#include <util/delay.h>
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#include "next_kbd.h"
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#include "debug.h"
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static inline void out_lo(void);
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static inline void out_hi(void);
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static inline void query(void);
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static inline void reset(void);
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static inline uint32_t response(void);
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/* The keyboard sends signal with 50us pulse width on OUT line
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* while it seems to miss the 50us pulse on In line.
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* next_kbd_set_leds() often fails to sync LED status with 50us
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* but it works well with 51us(+1us) on TMK converter(ATMeaga32u2) at least.
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* TODO: test on Teensy and Pro Micro configuration
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*/
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#define out_hi_delay(intervals) do { out_hi(); _delay_us((NEXT_KBD_TIMING+1) * intervals); } while (0);
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#define out_lo_delay(intervals) do { out_lo(); _delay_us((NEXT_KBD_TIMING+1) * intervals); } while (0);
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#define query_delay(intervals) do { query(); _delay_us((NEXT_KBD_TIMING+1) * intervals); } while (0);
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#define reset_delay(intervals) do { reset(); _delay_us((NEXT_KBD_TIMING+1) * intervals); } while (0);
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void next_kbd_init(void)
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{
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out_hi();
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NEXT_KBD_IN_DDR &= ~(1<<NEXT_KBD_IN_BIT); // KBD_IN to input
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NEXT_KBD_IN_PORT |= (1<<NEXT_KBD_IN_BIT); // KBD_IN pull up
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query_delay(5);
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reset_delay(8);
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query_delay(5);
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reset_delay(8);
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}
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void next_kbd_set_leds(bool left, bool right)
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{
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cli();
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out_lo_delay(9);
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out_hi_delay(3);
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out_lo_delay(1);
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if (left) {
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out_hi_delay(1);
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} else {
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out_lo_delay(1);
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}
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if (right) {
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out_hi_delay(1);
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} else {
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out_lo_delay(1);
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}
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out_lo_delay(7);
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out_hi();
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sei();
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}
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#define NEXT_KBD_READ (NEXT_KBD_IN_PIN&(1<<NEXT_KBD_IN_BIT))
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uint32_t next_kbd_recv(void)
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{
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// First check to make sure that the keyboard is actually connected;
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// if not, just return
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// TODO: reflect the status of the keyboard in a return code
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if (!NEXT_KBD_READ) {
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sei();
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return 0;
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}
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query();
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uint32_t resp = response();
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return resp;
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}
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static inline uint32_t response(void)
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{
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cli();
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// try a 5ms read; this should be called after the query method has
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// been run so if a key is pressed we should get a response within
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// 5ms; if not then send a reset and exit
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uint8_t i = 0;
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uint32_t data = 0;
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uint16_t reset_timeout = 50000;
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while (NEXT_KBD_READ && reset_timeout) {
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asm(""); _delay_us(1); reset_timeout--;
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}
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if (!reset_timeout) {
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reset();
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sei();
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return 0;
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}
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_delay_us(NEXT_KBD_TIMING / 2);
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for (; i < 22; i++)
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{
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if (NEXT_KBD_READ)
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{
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data |= ((uint32_t) 1 << i);
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/* Note:
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* My testing with the ATmega32u4 showed that there might
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* something wrong with the timing here; by the end of the
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* second data byte some of the modifiers can get bumped out
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* to the next bit over if we just cycle through the data
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* based on the expected interval. There is a bit (i = 10)
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* in the middle of the data that is always on followed by
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* one that is always off - so we'll use that to reset our
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* timing in case we've gotten ahead of the keyboard;
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*/
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if (i == 10)
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{
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i++;
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while (NEXT_KBD_READ) ;
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_delay_us(NEXT_KBD_TIMING / 2);
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}
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} else {
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/* redundant - but I don't want to remove if it might screw
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* up the timing
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*/
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data |= ((uint32_t) 0 << i);
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}
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_delay_us(NEXT_KBD_TIMING);
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}
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sei();
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return data;
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}
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static inline void out_lo(void)
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{
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NEXT_KBD_OUT_PORT &= ~(1<<NEXT_KBD_OUT_BIT);
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NEXT_KBD_OUT_DDR |= (1<<NEXT_KBD_OUT_BIT);
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}
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static inline void out_hi(void)
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{
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/* input with pull up */
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NEXT_KBD_OUT_DDR &= ~(1<<NEXT_KBD_OUT_BIT);
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NEXT_KBD_OUT_PORT |= (1<<NEXT_KBD_OUT_BIT);
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}
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static inline void query(void)
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{
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out_lo_delay(5);
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out_hi_delay(1);
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out_lo_delay(3);
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out_hi();
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}
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static inline void reset(void)
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{
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out_lo_delay(1);
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out_hi_delay(4);
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out_lo_delay(1);
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out_hi_delay(6);
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out_lo_delay(10);
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out_hi();
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}
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