summaryrefslogtreecommitdiff
path: root/tmk_core/protocol/ps2_interrupt.c
diff options
context:
space:
mode:
Diffstat (limited to 'tmk_core/protocol/ps2_interrupt.c')
-rw-r--r--tmk_core/protocol/ps2_interrupt.c340
1 files changed, 0 insertions, 340 deletions
diff --git a/tmk_core/protocol/ps2_interrupt.c b/tmk_core/protocol/ps2_interrupt.c
deleted file mode 100644
index 780040d152..0000000000
--- a/tmk_core/protocol/ps2_interrupt.c
+++ /dev/null
@@ -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, PAL_MODE_INPUT); } \
- while (0)
-# define PS2_INT_ON() \
- { \
- palEnableLineEvent(PS2_CLOCK, PAL_EVENT_MODE_FALLING_EDGE); \
- palSetLineCallback(PS2_CLOCK, palCallback, NULL); \
- } \
- while (0)
-# define PS2_INT_OFF() \
- { palDisableLineEvent(PS2_CLOCK); } \
- 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
-}