mirror of
https://github.com/Keychron/qmk_firmware.git
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140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/*
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Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
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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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#pragma once
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#include <stdbool.h>
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#include "wait.h"
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#include "ps2_io.h"
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#include "print.h"
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/*
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* Primitive PS/2 Library for AVR
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*
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* PS/2 Resources
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* --------------
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* [1] The PS/2 Mouse/Keyboard Protocol
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* http://www.computer-engineering.org/ps2protocol/
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* Concise and thorough primer of PS/2 protocol.
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*
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* [2] Keyboard and Auxiliary Device Controller
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* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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* Signal Timing and Format
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*
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* [3] Keyboards(101- and 102-key)
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* http://www.mcamafia.de/pdf/ibm_hitrc11.pdf
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* Keyboard Layout, Scan Code Set, POR, and Commands.
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*
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* [4] PS/2 Reference Manuals
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* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
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* Collection of IBM Personal System/2 documents.
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*
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* [5] TrackPoint Engineering Specifications for version 3E
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* https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
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*/
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#define PS2_ACK 0xFA
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#define PS2_RESEND 0xFE
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#define PS2_SET_LED 0xED
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// TODO: error numbers
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#define PS2_ERR_NONE 0
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#define PS2_ERR_STARTBIT1 1
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#define PS2_ERR_STARTBIT2 2
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#define PS2_ERR_STARTBIT3 3
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#define PS2_ERR_PARITY 0x10
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#define PS2_ERR_NODATA 0x20
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#define PS2_LED_SCROLL_LOCK 0
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#define PS2_LED_NUM_LOCK 1
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#define PS2_LED_CAPS_LOCK 2
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extern uint8_t ps2_error;
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void ps2_host_init(void);
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uint8_t ps2_host_send(uint8_t data);
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uint8_t ps2_host_recv_response(void);
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uint8_t ps2_host_recv(void);
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void ps2_host_set_led(uint8_t usb_led);
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/*--------------------------------------------------------------------
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* static functions
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*------------------------------------------------------------------*/
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static inline uint16_t wait_clock_lo(uint16_t us) {
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while (clock_in() && us) {
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asm("");
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wait_us(1);
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us--;
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}
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return us;
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}
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static inline uint16_t wait_clock_hi(uint16_t us) {
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while (!clock_in() && us) {
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asm("");
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wait_us(1);
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us--;
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}
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return us;
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}
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static inline uint16_t wait_data_lo(uint16_t us) {
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while (data_in() && us) {
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asm("");
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wait_us(1);
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us--;
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}
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return us;
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}
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static inline uint16_t wait_data_hi(uint16_t us) {
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while (!data_in() && us) {
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asm("");
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wait_us(1);
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us--;
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}
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return us;
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}
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/* idle state that device can send */
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static inline void idle(void) {
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clock_hi();
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data_hi();
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}
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/* inhibit device to send */
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static inline void inhibit(void) {
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clock_lo();
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data_hi();
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}
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