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Relocate PS2 code (#14895)

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* Relocate ps2 protocol code

* clang

* Move makefile logic
This commit is contained in:
Joel Challis 2021-10-20 21:18:49 +01:00 • committed by GitHub
parent 5500c428dd
commit d4be4b67a2
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11 changed files with 38 additions and 32 deletions
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139
tmk_core/protocol/ps2.h
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@ -1,139 +0,0 @@
/*
Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
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.
*/
#pragma once
#include <stdbool.h>
#include "wait.h"
#include "ps2_io.h"
#include "print.h"
/*
* Primitive PS/2 Library for AVR
*
* PS/2 Resources
* --------------
* [1] The PS/2 Mouse/Keyboard Protocol
* http://www.computer-engineering.org/ps2protocol/
* Concise and thorough primer of PS/2 protocol.
*
* [2] Keyboard and Auxiliary Device Controller
* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
* Signal Timing and Format
*
* [3] Keyboards(101- and 102-key)
* http://www.mcamafia.de/pdf/ibm_hitrc11.pdf
* Keyboard Layout, Scan Code Set, POR, and Commands.
*
* [4] PS/2 Reference Manuals
* http://www.mcamafia.de/pdf/ibm_hitrc07.pdf
* Collection of IBM Personal System/2 documents.
*
* [5] TrackPoint Engineering Specifications for version 3E
* https://web.archive.org/web/20100526161812/http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
*/
#define PS2_ACK 0xFA
#define PS2_RESEND 0xFE
#define PS2_SET_LED 0xED
// TODO: error numbers
#define PS2_ERR_NONE 0
#define PS2_ERR_STARTBIT1 1
#define PS2_ERR_STARTBIT2 2
#define PS2_ERR_STARTBIT3 3
#define PS2_ERR_PARITY 0x10
#define PS2_ERR_NODATA 0x20
#define PS2_LED_SCROLL_LOCK 0
#define PS2_LED_NUM_LOCK 1
#define PS2_LED_CAPS_LOCK 2
extern uint8_t ps2_error;
void ps2_host_init(void);
uint8_t ps2_host_send(uint8_t data);
uint8_t ps2_host_recv_response(void);
uint8_t ps2_host_recv(void);
void ps2_host_set_led(uint8_t usb_led);
/*--------------------------------------------------------------------
* static functions
*------------------------------------------------------------------*/
static inline uint16_t wait_clock_lo(uint16_t us) {
while (clock_in() && us) {
asm("");
wait_us(1);
us--;
}
return us;
}
static inline uint16_t wait_clock_hi(uint16_t us) {
while (!clock_in() && us) {
asm("");
wait_us(1);
us--;
}
return us;
}
static inline uint16_t wait_data_lo(uint16_t us) {
while (data_in() && us) {
asm("");
wait_us(1);
us--;
}
return us;
}
static inline uint16_t wait_data_hi(uint16_t us) {
while (!data_in() && us) {
asm("");
wait_us(1);
us--;
}
return us;
}
/* idle state that device can send */
static inline void idle(void) {
clock_hi();
data_hi();
}
/* inhibit device to send */
static inline void inhibit(void) {
clock_lo();
data_hi();
}

187
tmk_core/protocol/ps2_busywait.c
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@ -1,187 +0,0 @@
/*
Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
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.
*/
/*
* PS/2 protocol busywait version
*/
#include <stdbool.h>
#include "wait.h"
#include "ps2.h"
#include "ps2_io.h"
#include "debug.h"
#define WAIT(stat, us, err) \
do { \
if (!wait_##stat(us)) { \
ps2_error = err; \
goto ERROR; \
} \
} while (0)
uint8_t ps2_error = PS2_ERR_NONE;
void ps2_host_init(void) {
clock_init();
data_init();
// POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
wait_ms(2500);
inhibit();
}
uint8_t ps2_host_send(uint8_t data) {
bool parity = true;
ps2_error = PS2_ERR_NONE;
/* terminate a transmission if we have */
inhibit();
wait_us(100); // 100us [4]p.13, [5]p.50
/* 'Request to Send' and Start bit */
data_lo();
clock_hi();
WAIT(clock_lo, 10000, 10); // 10ms [5]p.50
/* Data bit */
for (uint8_t i = 0; i < 8; i++) {
wait_us(15);
if (data & (1 << i)) {
parity = !parity;
data_hi();
} else {
data_lo();
}
WAIT(clock_hi, 50, 2);
WAIT(clock_lo, 50, 3);
}
/* Parity bit */
wait_us(15);
if (parity) {
data_hi();
} else {
data_lo();
}
WAIT(clock_hi, 50, 4);
WAIT(clock_lo, 50, 5);
/* Stop bit */
wait_us(15);
data_hi();
/* Ack */
WAIT(data_lo, 50, 6);
WAIT(clock_lo, 50, 7);
/* wait for idle state */
WAIT(clock_hi, 50, 8);
WAIT(data_hi, 50, 9);
inhibit();
return ps2_host_recv_response();
ERROR:
inhibit();
return 0;
}
/* receive data when host want else inhibit communication */
uint8_t ps2_host_recv_response(void) {
// Command may take 25ms/20ms at most([5]p.46, [3]p.21)
// 250 * 100us(wait for start bit in ps2_host_recv)
uint8_t data = 0;
uint8_t try
= 250;
do {
data = ps2_host_recv();
} while (try --&&ps2_error);
return data;
}
/* called after start bit comes */
uint8_t ps2_host_recv(void) {
uint8_t data = 0;
bool parity = true;
ps2_error = PS2_ERR_NONE;
/* release lines(idle state) */
idle();
/* start bit [1] */
WAIT(clock_lo, 100, 1); // TODO: this is enough?
WAIT(data_lo, 1, 2);
WAIT(clock_hi, 50, 3);
/* data [2-9] */
for (uint8_t i = 0; i < 8; i++) {
WAIT(clock_lo, 50, 4);
if (data_in()) {
parity = !parity;
data |= (1 << i);
}
WAIT(clock_hi, 50, 5);
}
/* parity [10] */
WAIT(clock_lo, 50, 6);
if (data_in() != parity) {
ps2_error = PS2_ERR_PARITY;
goto ERROR;
}
WAIT(clock_hi, 50, 7);
/* stop bit [11] */
WAIT(clock_lo, 50, 8);
WAIT(data_hi, 1, 9);
WAIT(clock_hi, 50, 10);
inhibit();
return data;
ERROR:
if (ps2_error > PS2_ERR_STARTBIT3) {
xprintf("x%02X\n", ps2_error);
}
inhibit();
return 0;
}
/* send LED state to keyboard */
void ps2_host_set_led(uint8_t led) {
ps2_host_send(0xED);
ps2_host_send(led);
}

340
tmk_core/protocol/ps2_interrupt.c
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@ -1,340 +0,0 @@
/*
Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
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.
*/
/*
* PS/2 protocol Pin interrupt version
*/
#include <stdbool.h>
#if defined(__AVR__)
# include <avr/interrupt.h>
#elif defined(PROTOCOL_CHIBIOS) // TODO: or STM32 ?
// chibiOS headers
# include "ch.h"
# include "hal.h"
#endif
#include "ps2.h"
#include "ps2_io.h"
#include "print.h"
#include "wait.h"
#define WAIT(stat, us, err) \
do { \
if (!wait_##stat(us)) { \
ps2_error = err; \
goto ERROR; \
} \
} while (0)
uint8_t ps2_error = PS2_ERR_NONE;
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);
#if defined(PROTOCOL_CHIBIOS)
void ps2_interrupt_service_routine(void);
void palCallback(void *arg) { ps2_interrupt_service_routine(); }
# define PS2_INT_INIT() \
{ palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_INPUT); } \
while (0)
# define PS2_INT_ON() \
{ \
palEnableLineEvent(PS2_CLOCK_PIN, PAL_EVENT_MODE_FALLING_EDGE); \
palSetLineCallback(PS2_CLOCK_PIN, palCallback, NULL); \
} \
while (0)
# define PS2_INT_OFF() \
{ palDisableLineEvent(PS2_CLOCK_PIN); } \
while (0)
#endif // PROTOCOL_CHIBIOS
void ps2_host_init(void) {
idle();
PS2_INT_INIT();
PS2_INT_ON();
// POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
// wait_ms(2500);
}
uint8_t ps2_host_send(uint8_t data) {
bool parity = true;
ps2_error = PS2_ERR_NONE;
PS2_INT_OFF();
/* terminate a transmission if we have */
inhibit();
wait_us(100); // 100us [4]p.13, [5]p.50
/* 'Request to Send' and Start bit */
data_lo();
clock_hi();
WAIT(clock_lo, 10000, 10); // 10ms [5]p.50
/* Data bit[2-9] */
for (uint8_t i = 0; i < 8; i++) {
if (data & (1 << i)) {
parity = !parity;
data_hi();
} else {
data_lo();
}
WAIT(clock_hi, 50, 2);
WAIT(clock_lo, 50, 3);
}
/* Parity bit */
wait_us(15);
if (parity) {
data_hi();
} else {
data_lo();
}
WAIT(clock_hi, 50, 4);
WAIT(clock_lo, 50, 5);
/* Stop bit */
wait_us(15);
data_hi();
/* Ack */
WAIT(data_lo, 50, 6);
WAIT(clock_lo, 50, 7);
/* wait for idle state */
WAIT(clock_hi, 50, 8);
WAIT(data_hi, 50, 9);
idle();
PS2_INT_ON();
return ps2_host_recv_response();
ERROR:
idle();
PS2_INT_ON();
return 0;
}
uint8_t ps2_host_recv_response(void) {
// Command may take 25ms/20ms at most([5]p.46, [3]p.21)
uint8_t retry = 25;
while (retry-- && !pbuf_has_data()) {
wait_ms(1);
}
return pbuf_dequeue();
}
/* get data received by interrupt */
uint8_t ps2_host_recv(void) {
if (pbuf_has_data()) {
ps2_error = PS2_ERR_NONE;
return pbuf_dequeue();
} else {
ps2_error = PS2_ERR_NODATA;
return 0;
}
}
void ps2_interrupt_service_routine(void) {
static enum {
INIT,
START,
BIT0,
BIT1,
BIT2,
BIT3,
BIT4,
BIT5,
BIT6,
BIT7,
PARITY,
STOP,
} state = INIT;
static uint8_t data = 0;
static uint8_t parity = 1;
// TODO: abort if elapse 100us from previous interrupt
// return unless falling edge
if (clock_in()) {
goto RETURN;
}
state++;
switch (state) {
case START:
if (data_in()) goto ERROR;
break;
case BIT0:
case BIT1:
case BIT2:
case BIT3:
case BIT4:
case BIT5:
case BIT6:
case BIT7:
data >>= 1;
if (data_in()) {
data |= 0x80;
parity++;
}
break;
case PARITY:
if (data_in()) {
if (!(parity & 0x01)) goto ERROR;
} else {
if (parity & 0x01) goto ERROR;
}
break;
case STOP:
if (!data_in()) goto ERROR;
pbuf_enqueue(data);
goto DONE;
break;
default:
goto ERROR;
}
goto RETURN;
ERROR:
ps2_error = state;
DONE:
state = INIT;
data = 0;
parity = 1;
RETURN:
return;
}
#if defined(__AVR__)
ISR(PS2_INT_VECT) { ps2_interrupt_service_routine(); }
#endif
/* send LED state to keyboard */
void ps2_host_set_led(uint8_t led) {
ps2_host_send(0xED);
ps2_host_send(led);
}
/*--------------------------------------------------------------------
* 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) {
#if defined(__AVR__)
uint8_t sreg = SREG;
cli();
#elif defined(PROTOCOL_CHIBIOS)
chSysLockFromISR();
#endif
uint8_t next = (pbuf_head + 1) % PBUF_SIZE;
if (next != pbuf_tail) {
pbuf[pbuf_head] = data;
pbuf_head = next;
} else {
print("pbuf: full\n");
}
#if defined(__AVR__)
SREG = sreg;
#elif defined(PROTOCOL_CHIBIOS)
chSysUnlockFromISR();
#endif
}
static inline uint8_t pbuf_dequeue(void) {
uint8_t val = 0;
#if defined(__AVR__)
uint8_t sreg = SREG;
cli();
#elif defined(PROTOCOL_CHIBIOS)
chSysLock();
#endif
if (pbuf_head != pbuf_tail) {
val = pbuf[pbuf_tail];
pbuf_tail = (pbuf_tail + 1) % PBUF_SIZE;
}
#if defined(__AVR__)
SREG = sreg;
#elif defined(PROTOCOL_CHIBIOS)
chSysUnlock();
#endif
return val;
}
static inline bool pbuf_has_data(void) {
#if defined(__AVR__)
uint8_t sreg = SREG;
cli();
#elif defined(PROTOCOL_CHIBIOS)
chSysLock();
#endif
bool has_data = (pbuf_head != pbuf_tail);
#if defined(__AVR__)
SREG = sreg;
#elif defined(PROTOCOL_CHIBIOS)
chSysUnlock();
#endif
return has_data;
}
static inline void pbuf_clear(void) {
#if defined(__AVR__)
uint8_t sreg = SREG;
cli();
#elif defined(PROTOCOL_CHIBIOS)
chSysLock();
#endif
pbuf_head = pbuf_tail = 0;
#if defined(__AVR__)
SREG = sreg;
#elif defined(PROTOCOL_CHIBIOS)
chSysUnlock();
#endif
}

11
tmk_core/protocol/ps2_io.h
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@ -1,11 +0,0 @@
#pragma once
void clock_init(void);
void clock_lo(void);
void clock_hi(void);
bool clock_in(void);
void data_init(void);
void data_lo(void);
void data_hi(void);
bool data_in(void);

51
tmk_core/protocol/ps2_io_avr.c
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@ -1,51 +0,0 @@
#include <stdbool.h>
#include "ps2_io.h"
#include "gpio.h"
#include "wait.h"
/* Check port settings for clock and data line */
#if !(defined(PS2_CLOCK_PIN))
# error "PS/2 clock setting is required in config.h"
#endif
#if !(defined(PS2_DATA_PIN))
# error "PS/2 data setting is required in config.h"
#endif
/*
* Clock
*/
void clock_init(void) {}
void clock_lo(void) {
// Transition from input with pull-up to output low via Hi-Z instead of output high
writePinLow(PS2_CLOCK_PIN);
setPinOutput(PS2_CLOCK_PIN);
}
void clock_hi(void) { setPinInputHigh(PS2_CLOCK_PIN); }
bool clock_in(void) {
setPinInputHigh(PS2_CLOCK_PIN);
wait_us(1);
return readPin(PS2_CLOCK_PIN);
}
/*
* Data
*/
void data_init(void) {}
void data_lo(void) {
// Transition from input with pull-up to output low via Hi-Z instead of output high
writePinLow(PS2_DATA_PIN);
setPinOutput(PS2_DATA_PIN);
}
void data_hi(void) { setPinInputHigh(PS2_DATA_PIN); }
bool data_in(void) {
setPinInputHigh(PS2_DATA_PIN);
wait_us(1);
return readPin(PS2_DATA_PIN);
}

55
tmk_core/protocol/ps2_io_chibios.c
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@ -1,55 +0,0 @@
#include <stdbool.h>
#include "ps2_io.h"
// chibiOS headers
#include "ch.h"
#include "hal.h"
/* Check port settings for clock and data line */
#if !(defined(PS2_CLOCK_PIN))
# error "PS/2 clock setting is required in config.h"
#endif
#if !(defined(PS2_DATA_PIN))
# error "PS/2 data setting is required in config.h"
#endif
/*
* Clock
*/
void clock_init(void) {}
void clock_lo(void) {
palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
palWriteLine(PS2_CLOCK_PIN, PAL_LOW);
}
void clock_hi(void) {
palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
palWriteLine(PS2_CLOCK_PIN, PAL_HIGH);
}
bool clock_in(void) {
palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_INPUT);
return palReadLine(PS2_CLOCK_PIN);
}
/*
* Data
*/
void data_init(void) {}
void data_lo(void) {
palSetLineMode(PS2_DATA_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
palWriteLine(PS2_DATA_PIN, PAL_LOW);
}
void data_hi(void) {
palSetLineMode(PS2_DATA_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
palWriteLine(PS2_DATA_PIN, PAL_HIGH);
}
bool data_in(void) {
palSetLineMode(PS2_DATA_PIN, PAL_MODE_INPUT);
return palReadLine(PS2_DATA_PIN);
}

274
tmk_core/protocol/ps2_mouse.c
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@ -1,274 +0,0 @@
/*
Copyright 2011,2013 Jun Wako <wakojun@gmail.com>
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 <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#if defined(__AVR__)
# include <avr/io.h>
#endif
#include "ps2_mouse.h"
#include "wait.h"
#include "host.h"
#include "timer.h"
#include "print.h"
#include "report.h"
#include "debug.h"
#include "ps2.h"
/* ============================= MACROS ============================ */
static report_mouse_t mouse_report = {};
static inline void ps2_mouse_print_report(report_mouse_t *mouse_report);
static inline void ps2_mouse_convert_report_to_hid(report_mouse_t *mouse_report);
static inline void ps2_mouse_clear_report(report_mouse_t *mouse_report);
static inline void ps2_mouse_enable_scrolling(void);
static inline void ps2_mouse_scroll_button_task(report_mouse_t *mouse_report);
/* ============================= IMPLEMENTATION ============================ */
/* supports only 3 button mouse at this time */
void ps2_mouse_init(void) {
ps2_host_init();
wait_ms(PS2_MOUSE_INIT_DELAY); // wait for powering up
PS2_MOUSE_SEND(PS2_MOUSE_RESET, "ps2_mouse_init: sending reset");
PS2_MOUSE_RECEIVE("ps2_mouse_init: read BAT");
PS2_MOUSE_RECEIVE("ps2_mouse_init: read DevID");
#ifdef PS2_MOUSE_USE_REMOTE_MODE
ps2_mouse_set_remote_mode();
#else
ps2_mouse_enable_data_reporting();
#endif
#ifdef PS2_MOUSE_ENABLE_SCROLLING
ps2_mouse_enable_scrolling();
#endif
#ifdef PS2_MOUSE_USE_2_1_SCALING
ps2_mouse_set_scaling_2_1();
#endif
ps2_mouse_init_user();
}
__attribute__((weak)) void ps2_mouse_init_user(void) {}
__attribute__((weak)) void ps2_mouse_moved_user(report_mouse_t *mouse_report) {}
void ps2_mouse_task(void) {
static uint8_t buttons_prev = 0;
extern int tp_buttons;
/* receives packet from mouse */
uint8_t rcv;
rcv = ps2_host_send(PS2_MOUSE_READ_DATA);
if (rcv == PS2_ACK) {
mouse_report.buttons = ps2_host_recv_response() | tp_buttons;
mouse_report.x = ps2_host_recv_response() * PS2_MOUSE_X_MULTIPLIER;
mouse_report.y = ps2_host_recv_response() * PS2_MOUSE_Y_MULTIPLIER;
#ifdef PS2_MOUSE_ENABLE_SCROLLING
mouse_report.v = -(ps2_host_recv_response() & PS2_MOUSE_SCROLL_MASK) * PS2_MOUSE_V_MULTIPLIER;
#endif
} else {
if (debug_mouse) print("ps2_mouse: fail to get mouse packet\n");
return;
}
/* if mouse moves or buttons state changes */
if (mouse_report.x || mouse_report.y || mouse_report.v || ((mouse_report.buttons ^ buttons_prev) & PS2_MOUSE_BTN_MASK)) {
#ifdef PS2_MOUSE_DEBUG_RAW
// Used to debug raw ps2 bytes from mouse
ps2_mouse_print_report(&mouse_report);
#endif
buttons_prev = mouse_report.buttons;
ps2_mouse_convert_report_to_hid(&mouse_report);
#if PS2_MOUSE_SCROLL_BTN_MASK
ps2_mouse_scroll_button_task(&mouse_report);
#endif
if (mouse_report.x || mouse_report.y || mouse_report.v) {
ps2_mouse_moved_user(&mouse_report);
}
#ifdef PS2_MOUSE_DEBUG_HID
// Used to debug the bytes sent to the host
ps2_mouse_print_report(&mouse_report);
#endif
host_mouse_send(&mouse_report);
}
ps2_mouse_clear_report(&mouse_report);
}
void ps2_mouse_disable_data_reporting(void) { PS2_MOUSE_SEND(PS2_MOUSE_DISABLE_DATA_REPORTING, "ps2 mouse disable data reporting"); }
void ps2_mouse_enable_data_reporting(void) { PS2_MOUSE_SEND(PS2_MOUSE_ENABLE_DATA_REPORTING, "ps2 mouse enable data reporting"); }
void ps2_mouse_set_remote_mode(void) {
PS2_MOUSE_SEND_SAFE(PS2_MOUSE_SET_REMOTE_MODE, "ps2 mouse set remote mode");
ps2_mouse_mode = PS2_MOUSE_REMOTE_MODE;
}
void ps2_mouse_set_stream_mode(void) {
PS2_MOUSE_SEND_SAFE(PS2_MOUSE_SET_STREAM_MODE, "ps2 mouse set stream mode");
ps2_mouse_mode = PS2_MOUSE_STREAM_MODE;
}
void ps2_mouse_set_scaling_2_1(void) { PS2_MOUSE_SEND_SAFE(PS2_MOUSE_SET_SCALING_2_1, "ps2 mouse set scaling 2:1"); }
void ps2_mouse_set_scaling_1_1(void) { PS2_MOUSE_SEND_SAFE(PS2_MOUSE_SET_SCALING_1_1, "ps2 mouse set scaling 1:1"); }
void ps2_mouse_set_resolution(ps2_mouse_resolution_t resolution) { PS2_MOUSE_SET_SAFE(PS2_MOUSE_SET_RESOLUTION, resolution, "ps2 mouse set resolution"); }
void ps2_mouse_set_sample_rate(ps2_mouse_sample_rate_t sample_rate) { PS2_MOUSE_SET_SAFE(PS2_MOUSE_SET_SAMPLE_RATE, sample_rate, "ps2 mouse set sample rate"); }
/* ============================= HELPERS ============================ */
#define X_IS_NEG (mouse_report->buttons & (1 << PS2_MOUSE_X_SIGN))
#define Y_IS_NEG (mouse_report->buttons & (1 << PS2_MOUSE_Y_SIGN))
#define X_IS_OVF (mouse_report->buttons & (1 << PS2_MOUSE_X_OVFLW))
#define Y_IS_OVF (mouse_report->buttons & (1 << PS2_MOUSE_Y_OVFLW))
static inline void ps2_mouse_convert_report_to_hid(report_mouse_t *mouse_report) {
// PS/2 mouse data is '9-bit integer'(-256 to 255) which is comprised of sign-bit and 8-bit value.
// bit: 8 7 ... 0
// sign \8-bit/
//
// Meanwhile USB HID mouse indicates 8bit data(-127 to 127), note that -128 is not used.
//
// This converts PS/2 data into HID value. Use only -127-127 out of PS/2 9-bit.
mouse_report->x = X_IS_NEG ? ((!X_IS_OVF && -127 <= mouse_report->x && mouse_report->x <= -1) ? mouse_report->x : -127) : ((!X_IS_OVF && 0 <= mouse_report->x && mouse_report->x <= 127) ? mouse_report->x : 127);
mouse_report->y = Y_IS_NEG ? ((!Y_IS_OVF && -127 <= mouse_report->y && mouse_report->y <= -1) ? mouse_report->y : -127) : ((!Y_IS_OVF && 0 <= mouse_report->y && mouse_report->y <= 127) ? mouse_report->y : 127);
#ifdef PS2_MOUSE_INVERT_BUTTONS
// swap left & right buttons
uint8_t needs_left = mouse_report->buttons & PS2_MOUSE_BTN_RIGHT;
uint8_t needs_right = mouse_report->buttons & PS2_MOUSE_BTN_LEFT;
mouse_report->buttons = (mouse_report->buttons & ~(PS2_MOUSE_BTN_MASK)) | (needs_left ? PS2_MOUSE_BTN_LEFT : 0) | (needs_right ? PS2_MOUSE_BTN_RIGHT : 0);
#else
// remove sign and overflow flags
mouse_report->buttons &= PS2_MOUSE_BTN_MASK;
#endif
#ifdef PS2_MOUSE_INVERT_X
mouse_report->x = -mouse_report->x;
#endif
#ifndef PS2_MOUSE_INVERT_Y // NOTE if not!
// invert coordinate of y to conform to USB HID mouse
mouse_report->y = -mouse_report->y;
#endif
#ifdef PS2_MOUSE_ROTATE
int8_t x = mouse_report->x;
int8_t y = mouse_report->y;
# if PS2_MOUSE_ROTATE == 90
mouse_report->x = y;
mouse_report->y = -x;
# elif PS2_MOUSE_ROTATE == 180
mouse_report->x = -x;
mouse_report->y = -y;
# elif PS2_MOUSE_ROTATE == 270
mouse_report->x = -y;
mouse_report->y = x;
# endif
#endif
}
static inline void ps2_mouse_clear_report(report_mouse_t *mouse_report) {
mouse_report->x = 0;
mouse_report->y = 0;
mouse_report->v = 0;
mouse_report->h = 0;
mouse_report->buttons = 0;
}
static inline void ps2_mouse_print_report(report_mouse_t *mouse_report) {
if (!debug_mouse) return;
print("ps2_mouse: [");
print_hex8(mouse_report->buttons);
print("|");
print_hex8((uint8_t)mouse_report->x);
print(" ");
print_hex8((uint8_t)mouse_report->y);
print(" ");
print_hex8((uint8_t)mouse_report->v);
print(" ");
print_hex8((uint8_t)mouse_report->h);
print("]\n");
}
static inline void ps2_mouse_enable_scrolling(void) {
PS2_MOUSE_SEND(PS2_MOUSE_SET_SAMPLE_RATE, "Initiaing scroll wheel enable: Set sample rate");
PS2_MOUSE_SEND(200, "200");
PS2_MOUSE_SEND(PS2_MOUSE_SET_SAMPLE_RATE, "Set sample rate");
PS2_MOUSE_SEND(100, "100");
PS2_MOUSE_SEND(PS2_MOUSE_SET_SAMPLE_RATE, "Set sample rate");
PS2_MOUSE_SEND(80, "80");
PS2_MOUSE_SEND(PS2_MOUSE_GET_DEVICE_ID, "Finished enabling scroll wheel");
wait_ms(20);
}
#define PRESS_SCROLL_BUTTONS mouse_report->buttons |= (PS2_MOUSE_SCROLL_BTN_MASK)
#define RELEASE_SCROLL_BUTTONS mouse_report->buttons &= ~(PS2_MOUSE_SCROLL_BTN_MASK)
static inline void ps2_mouse_scroll_button_task(report_mouse_t *mouse_report) {
static enum {
SCROLL_NONE,
SCROLL_BTN,
SCROLL_SENT,
} scroll_state = SCROLL_NONE;
static uint16_t scroll_button_time = 0;
if (PS2_MOUSE_SCROLL_BTN_MASK == (mouse_report->buttons & (PS2_MOUSE_SCROLL_BTN_MASK))) {
// All scroll buttons are pressed
if (scroll_state == SCROLL_NONE) {
scroll_button_time = timer_read();
scroll_state = SCROLL_BTN;
}
// If the mouse has moved, update the report to scroll instead of move the mouse
if (mouse_report->x || mouse_report->y) {
scroll_state = SCROLL_SENT;
mouse_report->v = -mouse_report->y / (PS2_MOUSE_SCROLL_DIVISOR_V);
mouse_report->h = mouse_report->x / (PS2_MOUSE_SCROLL_DIVISOR_H);
mouse_report->x = 0;
mouse_report->y = 0;
#ifdef PS2_MOUSE_INVERT_H
mouse_report->h = -mouse_report->h;
#endif
#ifdef PS2_MOUSE_INVERT_V
mouse_report->v = -mouse_report->v;
#endif
}
} else if (0 == (PS2_MOUSE_SCROLL_BTN_MASK & mouse_report->buttons)) {
// None of the scroll buttons are pressed
#if PS2_MOUSE_SCROLL_BTN_SEND
if (scroll_state == SCROLL_BTN && timer_elapsed(scroll_button_time) < PS2_MOUSE_SCROLL_BTN_SEND) {
PRESS_SCROLL_BUTTONS;
host_mouse_send(mouse_report);
wait_ms(100);
RELEASE_SCROLL_BUTTONS;
}
#endif
scroll_state = SCROLL_NONE;
}
RELEASE_SCROLL_BUTTONS;
}

177
tmk_core/protocol/ps2_mouse.h
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@ -1,177 +0,0 @@
/*
Copyright 2011 Jun Wako <wakojun@gmail.com>
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 <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdbool.h>
#include "debug.h"
#include "report.h"
#define PS2_MOUSE_SEND(command, message) \
do { \
__attribute__((unused)) uint8_t rcv = ps2_host_send(command); \
if (debug_mouse) { \
print((message)); \
xprintf(" command: %X, result: %X, error: %X \n", command, rcv, ps2_error); \
} \
} while (0)
#define PS2_MOUSE_SEND_SAFE(command, message) \
do { \
if (PS2_MOUSE_STREAM_MODE == ps2_mouse_mode) { \
ps2_mouse_disable_data_reporting(); \
} \
PS2_MOUSE_SEND(command, message); \
if (PS2_MOUSE_STREAM_MODE == ps2_mouse_mode) { \
ps2_mouse_enable_data_reporting(); \
} \
} while (0)
#define PS2_MOUSE_SET_SAFE(command, value, message) \
do { \
if (PS2_MOUSE_STREAM_MODE == ps2_mouse_mode) { \
ps2_mouse_disable_data_reporting(); \
} \
PS2_MOUSE_SEND(command, message); \
PS2_MOUSE_SEND(value, "Sending value"); \
if (PS2_MOUSE_STREAM_MODE == ps2_mouse_mode) { \
ps2_mouse_enable_data_reporting(); \
} \
} while (0)
#define PS2_MOUSE_RECEIVE(message) \
do { \
__attribute__((unused)) uint8_t rcv = ps2_host_recv_response(); \
if (debug_mouse) { \
print((message)); \
xprintf(" result: %X, error: %X \n", rcv, ps2_error); \
} \
} while (0)
__attribute__((unused)) static enum ps2_mouse_mode_e {
PS2_MOUSE_STREAM_MODE,
PS2_MOUSE_REMOTE_MODE,
} ps2_mouse_mode = PS2_MOUSE_STREAM_MODE;
/*
* Data format:
* byte|7 6 5 4 3 2 1 0
* ----+----------------------------------------------------------------
* 0|[Yovflw][Xovflw][Ysign ][Xsign ][ 1 ][Middle][Right ][Left ]
* 1|[ X movement(0-255) ]
* 2|[ Y movement(0-255) ]
*/
#define PS2_MOUSE_BTN_MASK 0x07
#define PS2_MOUSE_BTN_LEFT 0
#define PS2_MOUSE_BTN_RIGHT 1
#define PS2_MOUSE_BTN_MIDDLE 2
#define PS2_MOUSE_X_SIGN 4
#define PS2_MOUSE_Y_SIGN 5
#define PS2_MOUSE_X_OVFLW 6
#define PS2_MOUSE_Y_OVFLW 7
/* mouse button to start scrolling; set 0 to disable scroll */
#ifndef PS2_MOUSE_SCROLL_BTN_MASK
# define PS2_MOUSE_SCROLL_BTN_MASK (1 << PS2_MOUSE_BTN_MIDDLE)
#endif
/* send button event when button is released within this value(ms); set 0 to disable */
#ifndef PS2_MOUSE_SCROLL_BTN_SEND
# define PS2_MOUSE_SCROLL_BTN_SEND 300
#endif
/* divide virtical and horizontal mouse move by this to convert to scroll move */
#ifndef PS2_MOUSE_SCROLL_DIVISOR_V
# define PS2_MOUSE_SCROLL_DIVISOR_V 2
#endif
#ifndef PS2_MOUSE_SCROLL_DIVISOR_H
# define PS2_MOUSE_SCROLL_DIVISOR_H 2
#endif
/* multiply reported mouse values by these */
#ifndef PS2_MOUSE_X_MULTIPLIER
# define PS2_MOUSE_X_MULTIPLIER 1
#endif
#ifndef PS2_MOUSE_Y_MULTIPLIER
# define PS2_MOUSE_Y_MULTIPLIER 1
#endif
#ifndef PS2_MOUSE_V_MULTIPLIER
# define PS2_MOUSE_V_MULTIPLIER 1
#endif
/* For some mice this will need to be 0x0F */
#ifndef PS2_MOUSE_SCROLL_MASK
# define PS2_MOUSE_SCROLL_MASK 0xFF
#endif
#ifndef PS2_MOUSE_INIT_DELAY
# define PS2_MOUSE_INIT_DELAY 1000
#endif
enum ps2_mouse_command_e {
PS2_MOUSE_RESET = 0xFF,
PS2_MOUSE_RESEND = 0xFE,
PS2_MOSUE_SET_DEFAULTS = 0xF6,
PS2_MOUSE_DISABLE_DATA_REPORTING = 0xF5,
PS2_MOUSE_ENABLE_DATA_REPORTING = 0xF4,
PS2_MOUSE_SET_SAMPLE_RATE = 0xF3,
PS2_MOUSE_GET_DEVICE_ID = 0xF2,
PS2_MOUSE_SET_REMOTE_MODE = 0xF0,
PS2_MOUSE_SET_WRAP_MODE = 0xEC,
PS2_MOUSE_READ_DATA = 0xEB,
PS2_MOUSE_SET_STREAM_MODE = 0xEA,
PS2_MOUSE_STATUS_REQUEST = 0xE9,
PS2_MOUSE_SET_RESOLUTION = 0xE8,
PS2_MOUSE_SET_SCALING_2_1 = 0xE7,
PS2_MOUSE_SET_SCALING_1_1 = 0xE6,
};
typedef enum ps2_mouse_resolution_e {
PS2_MOUSE_1_COUNT_MM,
PS2_MOUSE_2_COUNT_MM,
PS2_MOUSE_4_COUNT_MM,
PS2_MOUSE_8_COUNT_MM,
} ps2_mouse_resolution_t;
typedef enum ps2_mouse_sample_rate_e {
PS2_MOUSE_10_SAMPLES_SEC = 10,
PS2_MOUSE_20_SAMPLES_SEC = 20,
PS2_MOUSE_40_SAMPLES_SEC = 40,
PS2_MOUSE_60_SAMPLES_SEC = 60,
PS2_MOUSE_80_SAMPLES_SEC = 80,
PS2_MOUSE_100_SAMPLES_SEC = 100,
PS2_MOUSE_200_SAMPLES_SEC = 200,
} ps2_mouse_sample_rate_t;
void ps2_mouse_init(void);
void ps2_mouse_init_user(void);
void ps2_mouse_task(void);
void ps2_mouse_disable_data_reporting(void);
void ps2_mouse_enable_data_reporting(void);
void ps2_mouse_set_remote_mode(void);
void ps2_mouse_set_stream_mode(void);
void ps2_mouse_set_scaling_2_1(void);
void ps2_mouse_set_scaling_1_1(void);
void ps2_mouse_set_resolution(ps2_mouse_resolution_t resolution);
void ps2_mouse_set_sample_rate(ps2_mouse_sample_rate_t sample_rate);
void ps2_mouse_moved_user(report_mouse_t *mouse_report);

226
tmk_core/protocol/ps2_usart.c
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@ -1,226 +0,0 @@
/*
Copyright 2010,2011,2012,2013 Jun WAKO <wakojun@gmail.com>
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.
*/
/*
* PS/2 protocol USART version
*/
#include <stdbool.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "ps2.h"
#include "ps2_io.h"
#include "print.h"
#ifndef PS2_CLOCK_DDR
# define PS2_CLOCK_DDR PORTx_ADDRESS(PS2_CLOCK_PIN)
#endif
#ifndef PS2_CLOCK_BIT
# define PS2_CLOCK_BIT (PS2_CLOCK_PIN & 0xF)
#endif
#ifndef PS2_DATA_DDR
# define PS2_DATA_DDR PORTx_ADDRESS(PS2_DATA_PIN)
#endif
#ifndef PS2_DATA_BIT
# define PS2_DATA_BIT (PS2_DATA_PIN & 0xF)
#endif
#define WAIT(stat, us, err) \
do { \
if (!wait_##stat(us)) { \
ps2_error = err; \
goto ERROR; \
} \
} while (0)
uint8_t ps2_error = PS2_ERR_NONE;
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 ps2_host_init(void) {
idle(); // without this many USART errors occur when cable is disconnected
PS2_USART_INIT();
PS2_USART_RX_INT_ON();
// POR(150-2000ms) plus BAT(300-500ms) may take 2.5sec([3]p.20)
//_delay_ms(2500);
}
uint8_t ps2_host_send(uint8_t data) {
bool parity = true;
ps2_error = PS2_ERR_NONE;
PS2_USART_OFF();
/* terminate a transmission if we have */
inhibit();
_delay_us(100); // [4]p.13
/* 'Request to Send' and Start bit */
data_lo();
clock_hi();
WAIT(clock_lo, 10000, 10); // 10ms [5]p.50
/* Data bit[2-9] */
for (uint8_t i = 0; i < 8; i++) {
_delay_us(15);
if (data & (1 << i)) {
parity = !parity;
data_hi();
} else {
data_lo();
}
WAIT(clock_hi, 50, 2);
WAIT(clock_lo, 50, 3);
}
/* Parity bit */
_delay_us(15);
if (parity) {
data_hi();
} else {
data_lo();
}
WAIT(clock_hi, 50, 4);
WAIT(clock_lo, 50, 5);
/* Stop bit */
_delay_us(15);
data_hi();
/* Ack */
WAIT(data_lo, 50, 6);
WAIT(clock_lo, 50, 7);
/* wait for idle state */
WAIT(clock_hi, 50, 8);
WAIT(data_hi, 50, 9);
idle();
PS2_USART_INIT();
PS2_USART_RX_INT_ON();
return ps2_host_recv_response();
ERROR:
idle();
PS2_USART_INIT();
PS2_USART_RX_INT_ON();
return 0;
}
uint8_t ps2_host_recv_response(void) {
// Command may take 25ms/20ms at most([5]p.46, [3]p.21)
uint8_t retry = 25;
while (retry-- && !pbuf_has_data()) {
_delay_ms(1);
}
return pbuf_dequeue();
}
uint8_t ps2_host_recv(void) {
if (pbuf_has_data()) {
ps2_error = PS2_ERR_NONE;
return pbuf_dequeue();
} else {
ps2_error = PS2_ERR_NODATA;
return 0;
}
}
ISR(PS2_USART_RX_VECT) {
// TODO: request RESEND when error occurs?
uint8_t error = PS2_USART_ERROR; // USART error should be read before data
uint8_t data = PS2_USART_RX_DATA;
if (!error) {
pbuf_enqueue(data);
} else {
xprintf("PS2 USART error: %02X data: %02X\n", error, data);
}
}
/* send LED state to keyboard */
void ps2_host_set_led(uint8_t led) {
ps2_host_send(0xED);
ps2_host_send(led);
}
/*--------------------------------------------------------------------
* 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;
}