RemoteIR.
Dependents: RemoteIR_TestProgram SerialGPS_TestProgram StarBoardOrangeExpansion1 Door_Slamming_Device ... more
ReceiverIR.cpp
- Committer:
- shintamainjp
- Date:
- 2010-08-21
- Revision:
- 6:e57504fc802e
- Parent:
- 5:e158c85c55ff
- Child:
- 7:9452ba065449
File content as of revision 6:e57504fc802e:
/** * IR receiver (Version 0.0.3) * * Copyright (C) 2010 Shinichiro Nakamura (CuBeatSystems) * http://shinta.main.jp/ */ #include "ReceiverIR.h" #define IRQ_ENABLE() sem.release(); __enable_irq() #define IRQ_DISABLE() sem.take(); __disable_irq() #define InRange(x,y) ((((y) * 0.7) < (x)) && ((x) < ((y) * 1.3))) ReceiverIR::ReceiverIR(PinName rxpin) : evt(rxpin) { IRQ_DISABLE(); evt.fall(this, &ReceiverIR::isr_fall); evt.rise(this, &ReceiverIR::isr_rise); evt.mode(PullUp); ticker.attach_us(this, &ReceiverIR::isr_wdt, 10 * 1000); init_state(); IRQ_ENABLE(); } ReceiverIR::~ReceiverIR() { } ReceiverIR::State ReceiverIR::getState() { IRQ_DISABLE(); State s = data.state; IRQ_ENABLE(); wait_ms(10); return s; } int ReceiverIR::getData(RemoteIR::Format *format, uint8_t *buf, int bitlength) { IRQ_DISABLE(); if (bitlength < data.bitcount) { IRQ_ENABLE(); return -1; } const int nbytes = data.bitcount / 8 + (((data.bitcount % 8) != 0) ? 1 : 0); *format = data.format; for (int i = 0; i < nbytes; i++) { buf[i] = data.buffer[i]; } init_state(); IRQ_ENABLE(); return bitcount; } void ReceiverIR::init_state(void) { work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; data.state = Idle; data.format = RemoteIR::UNKNOWN; data.bitcount = 0; timer.stop(); timer.reset(); for (int i = 0; i < sizeof(data.buffer); i++) { data.buffer[i] = 0; } } void ReceiverIR::isr_wdt(void) { IRQ_DISABLE(); static int cnt = 0; if ((Idle != data.state) || ((0 <= work.c1) || (0 <= work.c2) || (0 <= work.c3) || (0 <= work.d1) || (0 <= work.d2))) { cnt++; if (cnt > 50) { #if 1 printf("# WDT [c1=%d, c2=%d, c3=%d, d1=%d, d2=%d, state=%d, format=%d, bitcount=%d]\n", work.c1, work.c2, work.c3, work.d1, work.d2, data.state, data.format, data.bitcount); #endif init_state(); cnt = 0; } } else { cnt = 0; } IRQ_ENABLE(); } void ReceiverIR::isr_fall(void) { IRQ_DISABLE(); switch (data.state) { case Idle: if (work.c1 < 0) { timer.start(); work.c1 = timer.read_us(); } else { work.c3 = timer.read_us(); int a = work.c2 - work.c1; int b = work.c3 - work.c2; if (InRange(a, TUS_NEC * 16) && InRange(b, TUS_NEC * 8)) { /* * NEC. */ data.format = RemoteIR::NEC; data.state = Receiving; data.bitcount = 0; } else if (InRange(a, TUS_NEC * 16) && InRange(b, TUS_NEC * 4)) { /* * NEC Repeat. */ data.format = RemoteIR::NEC_REPEAT; data.state = Received; data.bitcount = 0; work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; } else if (InRange(a, TUS_AEHA * 8) && InRange(b, TUS_AEHA * 4)) { /* * AEHA. */ data.format = RemoteIR::AEHA; data.state = Receiving; data.bitcount = 0; } else if (InRange(a, TUS_AEHA * 8) && InRange(b, TUS_AEHA * 8)) { /* * AEHA Repeat. */ data.format = RemoteIR::AEHA_REPEAT; data.state = Received; data.bitcount = 0; work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; } else { init_state(); } } break; case Receiving: if (RemoteIR::NEC == data.format) { work.d2 = timer.read_us(); int a = work.d2 - work.d1; if (InRange(a, TUS_NEC * 3)) { data.buffer[data.bitcount / 8] |= (1 << (data.bitcount % 8)); } else if (InRange(a, TUS_NEC * 1)) { data.buffer[data.bitcount / 8] &= ~(1 << (data.bitcount % 8)); } data.bitcount++; #if 0 /* * Length of NEC is always 32 bits. */ if (32 <= data.bitcount) { data.state = Received; work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; } #else /* * Set timeout for tail detection automatically. */ timeout.detach(); timeout.attach_us(this, &ReceiverIR::isr_timeout, TUS_NEC * 5); #endif } else if (RemoteIR::AEHA == data.format) { work.d2 = timer.read_us(); int a = work.d2 - work.d1; if (InRange(a, TUS_AEHA * 3)) { data.buffer[data.bitcount / 8] |= (1 << (data.bitcount % 8)); } else if (InRange(a, TUS_AEHA * 1)) { data.buffer[data.bitcount / 8] &= ~(1 << (data.bitcount % 8)); } data.bitcount++; #if 0 /* * Typical length of AEHA is 48 bits. * Please check a specification of your remote controller if you find a problem. */ if (48 <= data.bitcount) { data.state = Received; work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; } #else /* * Set timeout for tail detection automatically. */ timeout.detach(); timeout.attach_us(this, &ReceiverIR::isr_timeout, TUS_AEHA * 5); #endif } else if (RemoteIR::SONY == data.format) { work.d1 = timer.read_us(); } break; case Received: break; default: break; } IRQ_ENABLE(); } void ReceiverIR::isr_rise(void) { IRQ_DISABLE(); switch (data.state) { case Idle: if (0 <= work.c1) { work.c2 = timer.read_us(); int a = work.c2 - work.c1; if (InRange(a, TUS_SONY * 4)) { data.format = RemoteIR::SONY; data.state = Receiving; data.bitcount = 0; } else { static const int MINIMUM_LEADER_WIDTH = 150; if (a < MINIMUM_LEADER_WIDTH) { init_state(); } } } else { init_state(); } break; case Receiving: if (RemoteIR::NEC == data.format) { work.d1 = timer.read_us(); } else if (RemoteIR::AEHA == data.format) { work.d1 = timer.read_us(); } else if (RemoteIR::SONY == data.format) { work.d2 = timer.read_us(); int a = work.d2 - work.d1; if (InRange(a, TUS_SONY * 2)) { data.buffer[data.bitcount / 8] |= (1 << (data.bitcount % 8)); } else if (InRange(a, TUS_SONY * 1)) { data.buffer[data.bitcount / 8] &= ~(1 << (data.bitcount % 8)); } data.bitcount++; #if 0 /* * How do we get the correct length? (6bits, 12bits, 15bits, 20bits...) * By a model only? * Please check a specification of your remote controller if you find a problem. */ if (12 <= data.bitcount) { data.state = Received; work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; } #else /* * Set timeout for tail detection automatically. */ timeout.detach(); timeout.attach_us(this, &ReceiverIR::isr_timeout, TUS_SONY * 4); #endif } break; case Received: break; default: break; } IRQ_ENABLE(); } void ReceiverIR::isr_timeout(void) { IRQ_DISABLE(); if (data.state == Receiving) { data.state = Received; work.c1 = -1; work.c2 = -1; work.c3 = -1; work.d1 = -1; work.d2 = -1; } IRQ_ENABLE(); }