+++ /dev/null
-/*
- * ox - infrared to usb keyboard/mouse adapter
- *
- * by Alexander Neumann <alexander@lochraster.org>
- *
- * inspired by InfraHID by Alex Badea,
- * see http://vamposdecampos.googlepages.com/infrahid.html
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 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, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * For more information on the GPL, please go to:
- * http://www.gnu.org/copyleft/gpl.html
- */
-
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <avr/pgmspace.h>
-#include <stdbool.h>
-#include <util/crc16.h>
-#include "config.h"
-#include "globals.h"
-#include "../common/common.h"
-#include "usb.h"
-#include "ir.h"
-#include "ir-cluster.h"
-#include "ui.h"
-
-/* macro magic */
-#define IR_DDR _DDRPORT(IR_PORTNAME)
-#define IR_PORT _OUTPORT(IR_PORTNAME)
-
-#if IR_INTNUM < 8
-# define IR_BANK 0
-# define IR_VECT PCINT0_vect
-#elif IR_INTNUM < 16
-# define IR_BANK 1
-# define IR_VECT PCINT1_vect
-#else
-# define IR_BANK 2
-# define IR_VECT PCINT2_vect
-#endif
-
-#define IR_INT (IR_INTNUM - IR_BANK * 8)
-#define IR_PCIE _PCIE(IR_BANK)
-#define IR_PCIF _PCIF(IR_BANK)
-#define IR_PCMSK _PCMSK(IR_BANK)
-
-/* 8 should be enough for everybody! */
-#define MAX_CLUSTERS 8
-
-/* internal state machine */
-static enum {
- READY = 0,
- LISTEN = 1,
- DONE = 2,
-} state;
-
-volatile struct ir_global_t ir_global;
-
-void ir_init(void)
-{
- /* initialize input pin (with pullup) */
- IR_DDR &= ~_BV(IR_PIN);
- IR_PORT |= _BV(IR_PIN);
-
- /* configure timer1 with prescaler 64 and CTC for measuring ir timings */
- TCCR1B = _BV(CS11) | _BV(CS10) | _BV(WGM12);
- /* configure timer action after 20ms: 20mhz/64/50 */
- OCR1A = F_CPU/50/64;
-}
-
-void ir_set_mode(enum ir_mode_t mode)
-{
- if (ir_global.mode != IR_DISABLED && mode == IR_DISABLED) {
- /* disable pin change interrupt */
- IR_PCMSK &= ~_BV(IR_INT);
- PCICR &= ~_BV(IR_PCIE);
-
- /* clear interrupt flags */
- TIFR1 = TIFR1;
- } else if (ir_global.mode == IR_DISABLED && mode != IR_DISABLED) {
- /* clear interrupt flags */
- TIFR1 = TIFR1;
-
- /* reset variables */
- ir_global.pos = 0;
- state = READY;
-
- /* enable pin change interrupt */
- IR_PCMSK |= _BV(IR_INT);
- PCICR |= _BV(IR_PCIE);
- }
-
- ir_global.mode = mode;
-
- if (mode == IR_DECODE || mode == IR_RAW)
- ui_blink(0, 0x5);
-}
-
-ISR(IR_VECT, ISR_NOBLOCK)
-{
- /* store code */
- uint16_t value = TCNT1;
- TCNT1 = 0;
-
- /* do not store the first 'off' timing value */
- if (state == READY)
- state = LISTEN;
- else if (state == LISTEN) {
- ir_global.time[ir_global.pos++] = value;
-
- /* check if we reached the end of the array */
- if (ir_global.pos == MAX_CODE_LENGTH)
- state = DONE;
- }
-}
-
-void ir_poll(void)
-{
- if (ir_global.mode == IR_DISABLED)
- return;
-
- /* check for timeout */
- if (TIFR1 & _BV(OCF1A)) {
- /* clear interrupt flag */
- TIFR1 = _BV(OCF1A);
-
- /* if ir has been detected, process code, else return to listening */
- if (ir_global.pos > 1) {
- state = DONE;
-
- /* set last timing to zero */
- if (ir_global.pos % 2 == 0)
- ir_global.time[ir_global.pos-1] = 0;
- else
- ir_global.time[ir_global.pos++] = 0;
- } else
- state = READY;
- }
-
- /* if code is complete, process! */
- if (state == DONE) {
- /* compute clusters */
- if (ir_global.mode == IR_RECEIVE || ir_global.mode == IR_DECODE) {
- uint16_t cluster_on[MAX_CLUSTERS];
- uint16_t cluster_off[MAX_CLUSTERS];
-
- uint8_t con = ir_cluster(&ir_global.time[0], ir_global.pos/2, &cluster_on[0], MAX_CLUSTERS);
- uint8_t coff = ir_cluster(&ir_global.time[1], ir_global.pos/2-1, &cluster_off[0], MAX_CLUSTERS);
-
- for (uint8_t i = 0; i < ir_global.pos/2; i++) {
- uint8_t data_on = ir_min_cluster(ir_global.time[2*i], cluster_on, con);
- uint8_t data_off = ir_min_cluster(ir_global.time[2*i+1], cluster_off, coff);
-
- ir_global.time[i] = data_on | (data_off << 8);
- }
-
- ir_global.pos /= 2;
- }
-
- if (ir_global.mode == IR_RECEIVE) {
- uint16_t crc = 0;
- for (uint8_t i = 0; i < ir_global.pos; i++) {
- crc = _crc16_update(crc, LO8(ir_global.time[i]));
- crc = _crc16_update(crc, HI8(ir_global.time[i]));
- }
-
- /* remember code and length */
- ir_global.last = crc;
- ir_global.length = ir_global.pos/2;
-
- /*
- * insert code evaluation here...
- */
-
- ui_blink(0x1, 0);
-
- ir_global.pos = 0;
- state = READY;
- } else {
- ui_blink(0, 0x1);
- ir_set_mode(IR_DISABLED);
- }
- }
-}
projects / fnordlicht-mini / blobdiff