+++ /dev/null
-/*
-
-NeXT non-ADB Keyboard Protocol
-
-Copyright 2013, Benjamin Gould (bgould@github.com)
-
-Based on:
-TMK firmware code Copyright 2011,2012 Jun WAKO <wakojun@gmail.com>
-Arduino code by "Ladyada" Limor Fried (http://ladyada.net/, http://adafruit.com/), released under BSD license
-
-Timing reference thanks to http://m0115.web.fc2.com/ (dead link), http://cfile7.uf.tistory.com/image/14448E464F410BF22380BB
-Pinouts thanks to http://www.68k.org/~degs/nextkeyboard.html
-Keycodes from http://ftp.netbsd.org/pub/NetBSD/NetBSD-release-6/src/sys/arch/next68k/dev/
-
-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 <stdint.h>
-#include <stdbool.h>
-#include <util/atomic.h>
-#include <util/delay.h>
-#include "next_kbd.h"
-#include "debug.h"
-
-static inline void out_lo(void);
-static inline void out_hi(void);
-static inline void query(void);
-static inline void reset(void);
-static inline uint32_t response(void);
-
-#define out_hi_delay(intervals) do { out_hi(); _delay_us(NEXT_KBD_TIMING * intervals); } while (0);
-#define out_lo_delay(intervals) do { out_lo(); _delay_us(NEXT_KBD_TIMING * intervals); } while (0);
-#define query_delay(intervals) do { query(); _delay_us(NEXT_KBD_TIMING * intervals); } while (0);
-#define reset_delay(intervals) do { reset(); _delay_us(NEXT_KBD_TIMING * intervals); } while (0);
-
-void next_kbd_init(void)
-{
- out_hi();
- NEXT_KBD_IN_DDR &= ~(1<<NEXT_KBD_IN_BIT); // KBD_IN to input
- NEXT_KBD_IN_PORT |= (1<<NEXT_KBD_IN_BIT); // KBD_IN pull up
-
- query_delay(5);
- reset_delay(8);
-
- query_delay(5);
- reset_delay(8);
-}
-
-void next_kbd_set_leds(bool left, bool right)
-{
- out_lo_delay(9);
-
- out_hi_delay(3);
- out_lo_delay(1);
-
- if (left) {
- out_hi_delay(1);
- } else {
- out_lo_delay(1);
- }
-
- if (right) {
- out_hi_delay(1);
- } else {
- out_lo_delay(1);
- }
-
- out_lo_delay(7);
- out_hi();
-}
-
-#define NEXT_KBD_READ (NEXT_KBD_IN_PIN&(1<<NEXT_KBD_IN_BIT))
-uint32_t next_kbd_recv(void)
-{
-
- // First check to make sure that the keyboard is actually connected;
- // if not, just return
- // TODO: reflect the status of the keyboard in a return code
- if (!NEXT_KBD_READ) {
- sei();
- return 0;
- }
-
- query();
- uint32_t resp = response();
-
- return resp;
-}
-
-static inline uint32_t response(void)
-{
- cli();
-
- // try a 5ms read; this should be called after the query method has
- // been run so if a key is pressed we should get a response within
- // 5ms; if not then send a reset and exit
- uint8_t i = 0;
- uint32_t data = 0;
- uint16_t reset_timeout = 50000;
- while (NEXT_KBD_READ && reset_timeout) {
- asm(""); _delay_us(1); reset_timeout--;
- }
- if (!reset_timeout) {
- reset();
- sei();
- return 0;
- }
- _delay_us(NEXT_KBD_TIMING / 2);
- for (; i < 22; i++)
- {
- if (NEXT_KBD_READ)
- {
- data |= ((uint32_t) 1 << i);
- /* Note:
- * My testing with the ATmega32u4 showed that there might
- * something wrong with the timing here; by the end of the
- * second data byte some of the modifiers can get bumped out
- * to the next bit over if we just cycle through the data
- * based on the expected interval. There is a bit (i = 10)
- * in the middle of the data that is always on followed by
- * one that is always off - so we'll use that to reset our
- * timing in case we've gotten ahead of the keyboard;
- */
- if (i == 10)
- {
- i++;
- while (NEXT_KBD_READ) ;
- _delay_us(NEXT_KBD_TIMING / 2);
- }
- } else {
- /* redundant - but I don't want to remove if it might screw
- * up the timing
- */
- data |= ((uint32_t) 0 << i);
- }
- _delay_us(NEXT_KBD_TIMING);
- }
-
- sei();
-
- return data;
-}
-
-static inline void out_lo(void)
-{
- NEXT_KBD_OUT_PORT &= ~(1<<NEXT_KBD_OUT_BIT);
- NEXT_KBD_OUT_DDR |= (1<<NEXT_KBD_OUT_BIT);
-}
-
-static inline void out_hi(void)
-{
- /* input with pull up */
- NEXT_KBD_OUT_DDR &= ~(1<<NEXT_KBD_OUT_BIT);
- NEXT_KBD_OUT_PORT |= (1<<NEXT_KBD_OUT_BIT);
-}
-
-static inline void query(void)
-{
- out_lo_delay(5);
- out_hi_delay(1);
- out_lo_delay(3);
- out_hi();
-}
-
-static inline void reset(void)
-{
- out_lo_delay(1);
- out_hi_delay(4);
- out_lo_delay(1);
- out_hi_delay(6);
- out_lo_delay(10);
- out_hi();
-}
projects / qmk_firmware.git / blobdiff