mirror of
https://github.com/Keychron/qmk_firmware.git
synced 2024-11-25 01:47:10 +06:00
346 lines
8.3 KiB
C
346 lines
8.3 KiB
C
/*
|
|
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 void pbuf_clear(void);
|
|
bool pbuf_has_data(void);
|
|
|
|
#if defined(PROTOCOL_CHIBIOS)
|
|
void ps2_interrupt_service_routine(void);
|
|
void palCallback(void *arg) {
|
|
ps2_interrupt_service_routine();
|
|
}
|
|
|
|
# define PS2_INT_INIT() \
|
|
do { \
|
|
palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_INPUT); \
|
|
} while (0)
|
|
# define PS2_INT_ON() \
|
|
do { \
|
|
palEnableLineEvent(PS2_CLOCK_PIN, PAL_EVENT_MODE_FALLING_EDGE); \
|
|
palSetLineCallback(PS2_CLOCK_PIN, palCallback, NULL); \
|
|
} while (0)
|
|
# define PS2_INT_OFF() \
|
|
do { \
|
|
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;
|
|
}
|
|
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
|
|
}
|