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ReceiverIR.cpp@3:dfed23b157e6, 2010-08-21 (annotated)

Committer:: shintamainjp
Date:: Sat Aug 21 04:46:14 2010 +0000
Revision:: 3:dfed23b157e6
Parent:: 1:4adf16017a0f
Child:: 4:2304646f6ff5

Who changed what in which revision?

User	Revision	Line number	New contents of line
shintamainjp	0:ec264f4ce158	1	/**
shintamainjp	0:ec264f4ce158	2	* IR receiver (Version 0.0.3)
shintamainjp	0:ec264f4ce158	3	*
shintamainjp	0:ec264f4ce158	4	* Copyright (C) 2010 Shinichiro Nakamura (CuBeatSystems)
shintamainjp	0:ec264f4ce158	5	* http://shinta.main.jp/
shintamainjp	0:ec264f4ce158	6	*/
shintamainjp	0:ec264f4ce158	7
shintamainjp	0:ec264f4ce158	8	#include "ReceiverIR.h"
shintamainjp	0:ec264f4ce158	9
shintamainjp	0:ec264f4ce158	10	#define IRQ_ENABLE() sem.release(); __enable_irq()
shintamainjp	0:ec264f4ce158	11	#define IRQ_DISABLE() sem.take(); __disable_irq()
shintamainjp	0:ec264f4ce158	12
shintamainjp	0:ec264f4ce158	13	#define InRange(x,y) ((((y) * 0.7) < (x)) && ((x) < ((y) * 1.3)))
shintamainjp	0:ec264f4ce158	14
shintamainjp	0:ec264f4ce158	15	ReceiverIR::ReceiverIR(PinName rxpin) : evt(rxpin) {
shintamainjp	0:ec264f4ce158	16	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	17	evt.fall(this, &ReceiverIR::isr_fall);
shintamainjp	0:ec264f4ce158	18	evt.rise(this, &ReceiverIR::isr_rise);
shintamainjp	0:ec264f4ce158	19	evt.mode(PullUp);
shintamainjp	0:ec264f4ce158	20	ticker.attach_us(this, &ReceiverIR::isr_wdt, 10 * 1000);
shintamainjp	0:ec264f4ce158	21	init_state();
shintamainjp	0:ec264f4ce158	22	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	23	}
shintamainjp	0:ec264f4ce158	24
shintamainjp	1:4adf16017a0f	25	ReceiverIR::~ReceiverIR() {
shintamainjp	1:4adf16017a0f	26	}
shintamainjp	1:4adf16017a0f	27
shintamainjp	0:ec264f4ce158	28	ReceiverIR::State ReceiverIR::getState() {
shintamainjp	0:ec264f4ce158	29	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	30	State s = data.state;
shintamainjp	0:ec264f4ce158	31	IRQ_ENABLE();
shintamainjp	3:dfed23b157e6	32	wait_ms(10);
shintamainjp	0:ec264f4ce158	33	return s;
shintamainjp	0:ec264f4ce158	34	}
shintamainjp	0:ec264f4ce158	35
shintamainjp	0:ec264f4ce158	36	int ReceiverIR::getData(RemoteIR::Format format, uint8_t buf, int bufsiz) {
shintamainjp	0:ec264f4ce158	37	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	38
shintamainjp	0:ec264f4ce158	39	const int bitcount = data.bitcount;
shintamainjp	0:ec264f4ce158	40	const int n = bitcount / 8 + (((bitcount % 8) != 0) ? 1 : 0);
shintamainjp	0:ec264f4ce158	41	if (bufsiz < n) {
shintamainjp	0:ec264f4ce158	42	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	43	return -1;
shintamainjp	0:ec264f4ce158	44	}
shintamainjp	0:ec264f4ce158	45
shintamainjp	0:ec264f4ce158	46	*format = data.format;
shintamainjp	0:ec264f4ce158	47	for (int i = 0; i < n; i++) {
shintamainjp	0:ec264f4ce158	48	buf[i] = data.buffer[i];
shintamainjp	0:ec264f4ce158	49	}
shintamainjp	0:ec264f4ce158	50
shintamainjp	0:ec264f4ce158	51	init_state();
shintamainjp	0:ec264f4ce158	52
shintamainjp	0:ec264f4ce158	53	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	54	return bitcount;
shintamainjp	0:ec264f4ce158	55	}
shintamainjp	0:ec264f4ce158	56
shintamainjp	0:ec264f4ce158	57	void ReceiverIR::init_state(void) {
shintamainjp	0:ec264f4ce158	58	work.c1 = -1;
shintamainjp	0:ec264f4ce158	59	work.c2 = -1;
shintamainjp	0:ec264f4ce158	60	work.c3 = -1;
shintamainjp	0:ec264f4ce158	61	work.d1 = -1;
shintamainjp	0:ec264f4ce158	62	work.d2 = -1;
shintamainjp	0:ec264f4ce158	63	data.state = Idle;
shintamainjp	0:ec264f4ce158	64	data.format = RemoteIR::UNKNOWN;
shintamainjp	0:ec264f4ce158	65	data.bitcount = 0;
shintamainjp	0:ec264f4ce158	66	timer.stop();
shintamainjp	0:ec264f4ce158	67	timer.reset();
shintamainjp	0:ec264f4ce158	68	for (int i = 0; i < sizeof(data.buffer); i++) {
shintamainjp	0:ec264f4ce158	69	data.buffer[i] = 0;
shintamainjp	0:ec264f4ce158	70	}
shintamainjp	0:ec264f4ce158	71	}
shintamainjp	0:ec264f4ce158	72
shintamainjp	0:ec264f4ce158	73	void ReceiverIR::isr_wdt(void) {
shintamainjp	0:ec264f4ce158	74	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	75	static int cnt = 0;
shintamainjp	0:ec264f4ce158	76	if ((Idle != data.state) \|\| ((0 <= work.c1) \|\| (0 <= work.c2) \|\| (0 <= work.c3) \|\| (0 <= work.d1) \|\| (0 <= work.d2))) {
shintamainjp	0:ec264f4ce158	77	cnt++;
shintamainjp	0:ec264f4ce158	78	if (cnt > 50) {
shintamainjp	3:dfed23b157e6	79	#if 1
shintamainjp	0:ec264f4ce158	80	printf("# WDT [c1=%d, c2=%d, c3=%d, d1=%d, d2=%d, state=%d, format=%d, bitcount=%d]\n",
shintamainjp	0:ec264f4ce158	81	work.c1,
shintamainjp	0:ec264f4ce158	82	work.c2,
shintamainjp	0:ec264f4ce158	83	work.c3,
shintamainjp	0:ec264f4ce158	84	work.d1,
shintamainjp	0:ec264f4ce158	85	work.d2,
shintamainjp	0:ec264f4ce158	86	data.state,
shintamainjp	0:ec264f4ce158	87	data.format,
shintamainjp	0:ec264f4ce158	88	data.bitcount);
shintamainjp	0:ec264f4ce158	89	#endif
shintamainjp	0:ec264f4ce158	90	init_state();
shintamainjp	0:ec264f4ce158	91	cnt = 0;
shintamainjp	0:ec264f4ce158	92	}
shintamainjp	0:ec264f4ce158	93	} else {
shintamainjp	0:ec264f4ce158	94	cnt = 0;
shintamainjp	0:ec264f4ce158	95	}
shintamainjp	0:ec264f4ce158	96	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	97	}
shintamainjp	0:ec264f4ce158	98
shintamainjp	0:ec264f4ce158	99	void ReceiverIR::isr_fall(void) {
shintamainjp	0:ec264f4ce158	100	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	101	switch (data.state) {
shintamainjp	0:ec264f4ce158	102	case Idle:
shintamainjp	0:ec264f4ce158	103	if (work.c1 < 0) {
shintamainjp	0:ec264f4ce158	104	timer.start();
shintamainjp	0:ec264f4ce158	105	work.c1 = timer.read_us();
shintamainjp	0:ec264f4ce158	106	} else {
shintamainjp	0:ec264f4ce158	107	work.c3 = timer.read_us();
shintamainjp	0:ec264f4ce158	108	int a = work.c2 - work.c1;
shintamainjp	0:ec264f4ce158	109	int b = work.c3 - work.c2;
shintamainjp	0:ec264f4ce158	110	if (InRange(a, TUS_NEC * 16) && InRange(b, TUS_NEC * 8)) {
shintamainjp	0:ec264f4ce158	111	/*
shintamainjp	0:ec264f4ce158	112	* NEC.
shintamainjp	0:ec264f4ce158	113	*/
shintamainjp	0:ec264f4ce158	114	data.format = RemoteIR::NEC;
shintamainjp	0:ec264f4ce158	115	data.state = Receiving;
shintamainjp	0:ec264f4ce158	116	data.bitcount = 0;
shintamainjp	0:ec264f4ce158	117	} else if (InRange(a, TUS_NEC * 16) && InRange(b, TUS_NEC * 4)) {
shintamainjp	0:ec264f4ce158	118	/*
shintamainjp	0:ec264f4ce158	119	* NEC Repeat.
shintamainjp	0:ec264f4ce158	120	*/
shintamainjp	3:dfed23b157e6	121	data.format = RemoteIR::NEC_REPEAT;
shintamainjp	0:ec264f4ce158	122	data.state = Received;
shintamainjp	0:ec264f4ce158	123	data.bitcount = 0;
shintamainjp	3:dfed23b157e6	124	work.c1 = -1;
shintamainjp	3:dfed23b157e6	125	work.c2 = -1;
shintamainjp	3:dfed23b157e6	126	work.c3 = -1;
shintamainjp	3:dfed23b157e6	127	work.d1 = -1;
shintamainjp	3:dfed23b157e6	128	work.d2 = -1;
shintamainjp	0:ec264f4ce158	129	} else if (InRange(a, TUS_AEHA * 8) && InRange(b, TUS_AEHA * 4)) {
shintamainjp	0:ec264f4ce158	130	/*
shintamainjp	0:ec264f4ce158	131	* AEHA.
shintamainjp	0:ec264f4ce158	132	*/
shintamainjp	0:ec264f4ce158	133	data.format = RemoteIR::AEHA;
shintamainjp	0:ec264f4ce158	134	data.state = Receiving;
shintamainjp	0:ec264f4ce158	135	data.bitcount = 0;
shintamainjp	0:ec264f4ce158	136	} else if (InRange(a, TUS_AEHA * 8) && InRange(b, TUS_AEHA * 8)) {
shintamainjp	0:ec264f4ce158	137	/*
shintamainjp	0:ec264f4ce158	138	* AEHA Repeat.
shintamainjp	0:ec264f4ce158	139	*/
shintamainjp	3:dfed23b157e6	140	data.format = RemoteIR::AEHA_REPEAT;
shintamainjp	0:ec264f4ce158	141	data.state = Received;
shintamainjp	0:ec264f4ce158	142	data.bitcount = 0;
shintamainjp	3:dfed23b157e6	143	work.c1 = -1;
shintamainjp	3:dfed23b157e6	144	work.c2 = -1;
shintamainjp	3:dfed23b157e6	145	work.c3 = -1;
shintamainjp	3:dfed23b157e6	146	work.d1 = -1;
shintamainjp	3:dfed23b157e6	147	work.d2 = -1;
shintamainjp	0:ec264f4ce158	148	} else {
shintamainjp	0:ec264f4ce158	149	init_state();
shintamainjp	0:ec264f4ce158	150	}
shintamainjp	0:ec264f4ce158	151	}
shintamainjp	0:ec264f4ce158	152	break;
shintamainjp	0:ec264f4ce158	153	case Receiving:
shintamainjp	0:ec264f4ce158	154	if (RemoteIR::NEC == data.format) {
shintamainjp	0:ec264f4ce158	155	work.d2 = timer.read_us();
shintamainjp	0:ec264f4ce158	156	int a = work.d2 - work.d1;
shintamainjp	0:ec264f4ce158	157	if (InRange(a, TUS_NEC * 3)) {
shintamainjp	0:ec264f4ce158	158	data.buffer[data.bitcount / 8] \|= (1 << (data.bitcount % 8));
shintamainjp	0:ec264f4ce158	159	} else if (InRange(a, TUS_NEC * 1)) {
shintamainjp	0:ec264f4ce158	160	data.buffer[data.bitcount / 8] &= ~(1 << (data.bitcount % 8));
shintamainjp	0:ec264f4ce158	161	}
shintamainjp	0:ec264f4ce158	162	data.bitcount++;
shintamainjp	3:dfed23b157e6	163	#if 0
shintamainjp	0:ec264f4ce158	164	/*
shintamainjp	0:ec264f4ce158	165	* Length of NEC is always 32 bits.
shintamainjp	0:ec264f4ce158	166	*/
shintamainjp	0:ec264f4ce158	167	if (32 <= data.bitcount) {
shintamainjp	0:ec264f4ce158	168	data.state = Received;
shintamainjp	0:ec264f4ce158	169	work.c1 = -1;
shintamainjp	0:ec264f4ce158	170	work.c2 = -1;
shintamainjp	0:ec264f4ce158	171	work.c3 = -1;
shintamainjp	0:ec264f4ce158	172	work.d1 = -1;
shintamainjp	0:ec264f4ce158	173	work.d2 = -1;
shintamainjp	0:ec264f4ce158	174	}
shintamainjp	0:ec264f4ce158	175	#else
shintamainjp	0:ec264f4ce158	176	/*
shintamainjp	0:ec264f4ce158	177	* Set timeout for tail detection automatically.
shintamainjp	0:ec264f4ce158	178	*/
shintamainjp	0:ec264f4ce158	179	timeout.detach();
shintamainjp	3:dfed23b157e6	180	timeout.attach_us(this, &ReceiverIR::isr_timeout, TUS_NEC * 5);
shintamainjp	0:ec264f4ce158	181	#endif
shintamainjp	0:ec264f4ce158	182	} else if (RemoteIR::AEHA == data.format) {
shintamainjp	0:ec264f4ce158	183	work.d2 = timer.read_us();
shintamainjp	0:ec264f4ce158	184	int a = work.d2 - work.d1;
shintamainjp	0:ec264f4ce158	185	if (InRange(a, TUS_AEHA * 3)) {
shintamainjp	0:ec264f4ce158	186	data.buffer[data.bitcount / 8] \|= (1 << (data.bitcount % 8));
shintamainjp	0:ec264f4ce158	187	} else if (InRange(a, TUS_AEHA * 1)) {
shintamainjp	0:ec264f4ce158	188	data.buffer[data.bitcount / 8] &= ~(1 << (data.bitcount % 8));
shintamainjp	0:ec264f4ce158	189	}
shintamainjp	0:ec264f4ce158	190	data.bitcount++;
shintamainjp	3:dfed23b157e6	191	#if 0
shintamainjp	0:ec264f4ce158	192	/*
shintamainjp	0:ec264f4ce158	193	* Typical length of AEHA is 48 bits.
shintamainjp	0:ec264f4ce158	194	* Please check a specification of your remote controller if you find a problem.
shintamainjp	0:ec264f4ce158	195	*/
shintamainjp	0:ec264f4ce158	196	if (48 <= data.bitcount) {
shintamainjp	0:ec264f4ce158	197	data.state = Received;
shintamainjp	0:ec264f4ce158	198	work.c1 = -1;
shintamainjp	0:ec264f4ce158	199	work.c2 = -1;
shintamainjp	0:ec264f4ce158	200	work.c3 = -1;
shintamainjp	0:ec264f4ce158	201	work.d1 = -1;
shintamainjp	0:ec264f4ce158	202	work.d2 = -1;
shintamainjp	0:ec264f4ce158	203	}
shintamainjp	0:ec264f4ce158	204	#else
shintamainjp	0:ec264f4ce158	205	/*
shintamainjp	0:ec264f4ce158	206	* Set timeout for tail detection automatically.
shintamainjp	0:ec264f4ce158	207	*/
shintamainjp	0:ec264f4ce158	208	timeout.detach();
shintamainjp	3:dfed23b157e6	209	timeout.attach_us(this, &ReceiverIR::isr_timeout, TUS_AEHA * 5);
shintamainjp	0:ec264f4ce158	210	#endif
shintamainjp	0:ec264f4ce158	211	} else if (RemoteIR::SONY == data.format) {
shintamainjp	0:ec264f4ce158	212	work.d1 = timer.read_us();
shintamainjp	0:ec264f4ce158	213	}
shintamainjp	0:ec264f4ce158	214	break;
shintamainjp	0:ec264f4ce158	215	case Received:
shintamainjp	0:ec264f4ce158	216	break;
shintamainjp	0:ec264f4ce158	217	default:
shintamainjp	0:ec264f4ce158	218	break;
shintamainjp	0:ec264f4ce158	219	}
shintamainjp	0:ec264f4ce158	220	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	221	}
shintamainjp	0:ec264f4ce158	222
shintamainjp	0:ec264f4ce158	223	void ReceiverIR::isr_rise(void) {
shintamainjp	0:ec264f4ce158	224	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	225	switch (data.state) {
shintamainjp	0:ec264f4ce158	226	case Idle:
shintamainjp	0:ec264f4ce158	227	if (0 <= work.c1) {
shintamainjp	0:ec264f4ce158	228	work.c2 = timer.read_us();
shintamainjp	0:ec264f4ce158	229	int a = work.c2 - work.c1;
shintamainjp	0:ec264f4ce158	230	if (InRange(a, TUS_SONY * 4)) {
shintamainjp	0:ec264f4ce158	231	data.format = RemoteIR::SONY;
shintamainjp	0:ec264f4ce158	232	data.state = Receiving;
shintamainjp	0:ec264f4ce158	233	data.bitcount = 0;
shintamainjp	0:ec264f4ce158	234	} else {
shintamainjp	0:ec264f4ce158	235	static const int MINIMUM_LEADER_WIDTH = 150;
shintamainjp	0:ec264f4ce158	236	if (a < MINIMUM_LEADER_WIDTH) {
shintamainjp	0:ec264f4ce158	237	init_state();
shintamainjp	0:ec264f4ce158	238	}
shintamainjp	0:ec264f4ce158	239	}
shintamainjp	0:ec264f4ce158	240	} else {
shintamainjp	0:ec264f4ce158	241	init_state();
shintamainjp	0:ec264f4ce158	242	}
shintamainjp	0:ec264f4ce158	243	break;
shintamainjp	0:ec264f4ce158	244	case Receiving:
shintamainjp	0:ec264f4ce158	245	if (RemoteIR::NEC == data.format) {
shintamainjp	0:ec264f4ce158	246	work.d1 = timer.read_us();
shintamainjp	0:ec264f4ce158	247	} else if (RemoteIR::AEHA == data.format) {
shintamainjp	0:ec264f4ce158	248	work.d1 = timer.read_us();
shintamainjp	0:ec264f4ce158	249	} else if (RemoteIR::SONY == data.format) {
shintamainjp	0:ec264f4ce158	250	work.d2 = timer.read_us();
shintamainjp	0:ec264f4ce158	251	int a = work.d2 - work.d1;
shintamainjp	0:ec264f4ce158	252	if (InRange(a, TUS_SONY * 2)) {
shintamainjp	0:ec264f4ce158	253	data.buffer[data.bitcount / 8] \|= (1 << (data.bitcount % 8));
shintamainjp	0:ec264f4ce158	254	} else if (InRange(a, TUS_SONY * 1)) {
shintamainjp	0:ec264f4ce158	255	data.buffer[data.bitcount / 8] &= ~(1 << (data.bitcount % 8));
shintamainjp	0:ec264f4ce158	256	}
shintamainjp	0:ec264f4ce158	257	data.bitcount++;
shintamainjp	3:dfed23b157e6	258	#if 0
shintamainjp	0:ec264f4ce158	259	/*
shintamainjp	0:ec264f4ce158	260	* How do we get the correct length? (6bits, 12bits, 15bits, 20bits...)
shintamainjp	0:ec264f4ce158	261	* By a model only?
shintamainjp	0:ec264f4ce158	262	* Please check a specification of your remote controller if you find a problem.
shintamainjp	0:ec264f4ce158	263	*/
shintamainjp	0:ec264f4ce158	264	if (12 <= data.bitcount) {
shintamainjp	0:ec264f4ce158	265	data.state = Received;
shintamainjp	0:ec264f4ce158	266	work.c1 = -1;
shintamainjp	0:ec264f4ce158	267	work.c2 = -1;
shintamainjp	0:ec264f4ce158	268	work.c3 = -1;
shintamainjp	0:ec264f4ce158	269	work.d1 = -1;
shintamainjp	0:ec264f4ce158	270	work.d2 = -1;
shintamainjp	0:ec264f4ce158	271	}
shintamainjp	0:ec264f4ce158	272	#else
shintamainjp	0:ec264f4ce158	273	/*
shintamainjp	0:ec264f4ce158	274	* Set timeout for tail detection automatically.
shintamainjp	0:ec264f4ce158	275	*/
shintamainjp	0:ec264f4ce158	276	timeout.detach();
shintamainjp	3:dfed23b157e6	277	timeout.attach_us(this, &ReceiverIR::isr_timeout, TUS_SONY * 4);
shintamainjp	0:ec264f4ce158	278	#endif
shintamainjp	0:ec264f4ce158	279	}
shintamainjp	0:ec264f4ce158	280	break;
shintamainjp	0:ec264f4ce158	281	case Received:
shintamainjp	0:ec264f4ce158	282	break;
shintamainjp	0:ec264f4ce158	283	default:
shintamainjp	0:ec264f4ce158	284	break;
shintamainjp	0:ec264f4ce158	285	}
shintamainjp	0:ec264f4ce158	286	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	287	}
shintamainjp	0:ec264f4ce158	288
shintamainjp	0:ec264f4ce158	289	void ReceiverIR::isr_timeout(void) {
shintamainjp	0:ec264f4ce158	290	IRQ_DISABLE();
shintamainjp	0:ec264f4ce158	291	if (data.state == Receiving) {
shintamainjp	0:ec264f4ce158	292	data.state = Received;
shintamainjp	0:ec264f4ce158	293	work.c1 = -1;
shintamainjp	0:ec264f4ce158	294	work.c2 = -1;
shintamainjp	0:ec264f4ce158	295	work.c3 = -1;
shintamainjp	0:ec264f4ce158	296	work.d1 = -1;
shintamainjp	0:ec264f4ce158	297	work.d2 = -1;
shintamainjp	0:ec264f4ce158	298	}
shintamainjp	0:ec264f4ce158	299	IRQ_ENABLE();
shintamainjp	0:ec264f4ce158	300	}

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Type:	Library
Created:	17 Aug 2010
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ReceiverIR.cpp@3:dfed23b157e6, 2010-08-21 (annotated)

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