ir.c

来自「ESS3890+SL原代码（1*16内存）」· C语言 代码 · 共 1,376 行 · 第 1/3 页

    mvd[riface_clear_dbgirq] = 0;		/* Clear debug_irq	*/
    enable_int(debug);
}


#if (IR_NEC || IR_SANYO)
PRIVATE void IR_core_NEC(falling_edge)
int falling_edge;
{
    unsigned int *ir_tbl;

#define LEADER_LOW_MIN	ir_tbl[0]
#define LEADER_LOW_MAX	ir_tbl[1]
#define LEADER_HIGH_MIN	ir_tbl[2]
#define LEADER_HIGH_MAX	ir_tbl[3]
#define DATA_1_MIN	ir_tbl[4]
#define DATA_1_MAX	ir_tbl[5]
#define DATA_0_MIN	ir_tbl[6]
#define DATA_0_MAX	ir_tbl[7]
#ifdef IRREP
#define REPEAT_HIGH_MIN ir_tbl[8]
#define REPEAT_HIGH_MAX ir_tbl[9]
#define REPEAT_DATA_MIN	ir_tbl[10]
#define REPEAT_DATA_MAX ir_tbl[11]
#endif

    ir_tbl = T_IR_powerup_tbl;
#ifdef DSC
    if (IS_POWER_DOWN) ir_tbl = T_IR_powerdn_tbl;
#endif

    /* First IR interrupt should be a falling edge */
    if (stateIR == IR_IDLE) {
	if (falling_edge) stateIR = IR_LEADER_LOW;
	else cntIRchg = prevIRtime = 0;
    }

    /*
     * We only process things when we get 2 bits (i.e. 2 time period).
     */
    if (cntIRchg == 2) {
	unsigned char data;
	char reset = 0;
	unsigned int  width;

	cntIRchg = 0;
	width = diffIR[1];

	if (stateIR == IR_CUSTOM) {/* Put most common case first */
	    /*
	     * We are collecting system code or custom code
	     */
	    width += diffIR[0];	/* Get data + gap */
	    dataIR <<= 1;
	    if ((width >= DATA_1_MIN) && (width <= DATA_1_MAX)) {
		dataIR |= 0x1;
	    } else if ((width < DATA_0_MIN) || (width > DATA_1_MAX)) {
#ifdef IR_NEC
		/*
		 * I am assert kill here because we may not recognize
		 * the singal because our checks are too tight; yet
		 * the external micro controller can still recognize it.
		 * By killing it, we guarantee that external logic won't
		 * recognize it.
		 *
		 * However, there may also be a downside: if IR input
		 * has noise, the external micro controll may still
		 * properly receive signal if we don't kill the input;
		 * if killIR is asserted, then this may be a problem.
		 */
		killIR = 1;
		reset = 1;
#endif /* IR_NEC */

#ifdef IR_SANYO
		if (cntIRbits == 0) {
		    /* 
		     * SANYO's repeat is the same as leader low/high.
		     * So we may mistaken repeat as a new code. So if
		     * we are broken on the first bit of new cutsom code,
		     * we shall assume it is a new code overall.
		     *
		     * The last one is probably a repeat, so this is
		     * really the first bit of leader low.
		     */
		    cntIRchg = 1;	/* We just need one more edge */
		    stateIR = IR_LEADER_LOW;
		} else {
		    killIR = 1;
		    reset = 1;
		}
#endif /* IR_SANYO */
	    }

	    cntIRbits++;

#ifdef IR_NEC
	    /* First 16 bits are syscode */
	    if ((cntIRbits == 16) && (dataIR != sysIRcode)) 
		reset = 1;

	    if (cntIRbits == 24) {
		/*
	 	* We will not wait for data bar. Base on data, we'll
	 	* decide whether we want to pass the IR to CD loader.
	 	* If we decided that the code shouldn't be passed on,
	 	* we'll intentionally destroy the output IR so CD
		* loader will not get it.
		*/
		data = dataIR & 0xff;
		/* reverse data bits to fit look up table */
		mvd[riface_reflect] = data;
		data = mvd[riface_reflect];
#ifdef IRREP
		previous_data = data;
		rep_timeout = glbTimer + QUARTER_SECOND;
#endif
		codeIR = data | 0x100;	/* Indicate a new code */
		/* Get the kill bit from the kill IR table */
#ifdef IRXMT
		killIR = tblKillIR[data >> 3] & ptrLshift[data & 7];
#endif
	    } else if (cntIRbits == 32) reset = 1;
#endif /* IR_NEC */

#ifdef IR_SANYO
	    if (cntIRbits == 13) {
		dataIR &= 0x1fff;
		if (dataIR != sysIRcode) reset = 1;
		dataIR = 0;
	    } else if (cntIRbits == 26) {
		unsigned short tmp = (~sysIRcode) & 0x1fff;
		if (dataIR != tmp) reset = 1;
		dataIR = 0;
	    } else if (cntIRbits == 34) {
		data = dataIR;
		mvd[riface_reflect] = data;
		data = mvd[riface_reflect];
		codeIR = data;
		dataIR = 0;
	    } else if (cntIRbits == 42) {
		data = dataIR;
		mvd[riface_reflect] = data;
		data = ~(mvd[riface_reflect]);
		if (data == codeIR) {
		    codeIR = data | 0x100;
		} else codeIR = 0;
		reset = 1;
	    }
#endif /* IR_SANYO */
	} else if (stateIR == IR_LEADER_LOW) {
	    if ((width >= LEADER_LOW_MIN) && (width <= LEADER_LOW_MAX)) {
	        stateIR = IR_LEADER_HIGH;
	        cntIRchg = 1; /* We'll only collect 1 change next time */
	    } else reset = 1;
#ifdef IRREP
        } else if (stateIR == IR_REPEAT) {
	    if ((width >= REPEAT_DATA_MIN) && (width <= REPEAT_DATA_MAX)) { 
		/* the width is 0.56 ms */
		if (rep_timeout > glbTimer) {
		    if (repeat_IRkey_allowed(previous_data)) {
			codeIR = previous_data | 0x100; /* Indicate a new code */
			rep_timeout = glbTimer + QUARTER_SECOND;
		    }
		} else {
		    previous_data = 0xff;
		}
	    }
	    reset = 1;
#endif
        } else {
	    /* stateIR has to be equal to IR_LEADER_HIGH */
	    if ((width >= LEADER_HIGH_MIN) && (width <= LEADER_HIGH_MAX)) {
	        dataIR = cntIRbits = 0;
	        stateIR = IR_CUSTOM;
#ifdef IRREP
	    } else if ((width >= REPEAT_HIGH_MIN) &&
		       (width <= REPEAT_HIGH_MAX)) { 
		/* if the width is 2.25 ms, it is repeat code leader */
		cntIRchg = 1; /* We'll only collect 1 change next time */
		stateIR = IR_REPEAT;
#endif
	    } else reset = 1;
	}

        if (reset) {
	    /* Reset all, start from the very beginning */
	    stateIR = IR_IDLE; 
	    cntIRchg = prevIRtime = 0; 
	}
    }
}
#endif /* IR_NEC || IR_SAYNO */

#ifdef IR_PHILIPS
PRIVATE unsigned int    data_half = 0;	/* Mark whether or nor have half_bit
                                           data before edge of intr. coming*/
PRIVATE void IR_core_Philips(falling_edge)
int falling_edge;
{
    unsigned int *ir_tbl;
    unsigned int width;
    int reset;
    int is_half_bit;
    int is_full_bit;

#define HALFBIT_MIN     ir_tbl[0]
#define HALFBIT_MAX     ir_tbl[1]
#define ONEBIT_MIN      ir_tbl[2]
#define ONEBIT_MAX      ir_tbl[3]

    ir_tbl = T_IR_powerup_tbl;
#ifdef DSC
    if (IS_POWER_DOWN) ir_tbl = T_IR_powerdn_tbl;
#endif

    width = diffIR[0];
    cntIRchg = 0;
    reset = 0;
    is_half_bit = (width >= HALFBIT_MIN) && (width <= HALFBIT_MAX);
    is_full_bit = (width >= ONEBIT_MIN)  && (width <= ONEBIT_MAX);

    if (stateIR == IR_IDLE) {
        if (falling_edge) stateIR = IR_LEADER;
        else prevIRtime = 0;
    } else if (stateIR == IR_LEADER) {
	/* We shall get a rising edge, since the first bit is fixed */
	dataIR = 0;
	cntIRbits = 0;
	stateIR = IR_CUSTOM;

	if (is_half_bit) data_half = 0;
	else if (is_full_bit) data_half = 1;
	else {
	    stateIR = IR_IDLE;
	    prevIRtime = 0;
	}
    } else {
	if (data_half) {
	    /* 
	     * We were in half bit position, so this edge shall either
	     * conclude the previous cycle or go the the half position
	     * of the next bit. Record the last bit.
	     */
	    dataIR <<= 1;
	    if (falling_edge) dataIR |= 1;
	    cntIRbits++;

	    if (is_half_bit) data_half = 0;
	    else if (!is_full_bit) reset = 1;
	} else {
	    /* 
	     * We started at a sampling cycle, so we shall only get half bit,
	     * otherwise, something is wrong!
	     */
	    if (is_half_bit) data_half = 1;
	    else reset = 1;
	}

	if ((cntIRbits == 12) && !falling_edge && data_half) {
	    /* This is the last rising edge, no more. So collect the bit */
	    dataIR <<= 1;
	    dataIR |= 1;
	    cntIRbits = 13;
	}

	if (reset) {
	    /* 
	     * Abnormal exist. Maybe we are out of sync. If this
	     * is falling edge, maybe this is the sync of a new
	     * input!
	     */
	    stateIR = IR_IDLE;
	    if (falling_edge) stateIR = IR_LEADER;
	} else if (cntIRbits == 13) {
	    /* We only care the case when system code matches */
	    if (((dataIR >> 6) & 0x1f) == sysIRcode) {
		unsigned int prevctlbit;
		prevctlbit = IR_ctlbit;

		IR_ctlbit = (dataIR >> 11) & 1;
		if ((unsigned int) IR_ctlbit != prevctlbit) {
		    int tmp = (dataIR >> 12) & 1;
		    if (tmp) tmp = 0x40;
		    codeIR = (dataIR & 0x3f) | tmp | 0x100;
		    IR_rep_cnt = 0;
		} else
		  IR_rep_cnt++;
		IR_int_time = (unsigned int) mvd[riface_timer2];
	    }
	    stateIR = IR_IDLE;
	}
    }
}
#endif /* IR_PHILIPS */

/*
 * DBG IRQ  INTERUPT SERVICE for IR
 *
 * This routine recognizes IR input and selectively retransmit signals.
 */
void IR_recv_interrupt_service()
{
    /* I shift data bit coming from IR from LSB to the left.	*/
    int falling_edge = 0, tmp;
    unsigned int currIRtime, tmp1;
    currIRtime = ((unsigned int) mvd[riface_timer2]);
    tmp1 = currIRtime - prevIRtime;
    if (currIRtime < prevIRtime) {/* Wrap around case */
	tmp1 += -timer2_period;
    }
    diffIR[cntIRchg++] = tmp1;
    prevIRtime = currIRtime;

    /* Toggle XOR to get next interupt */
#ifdef FLIP_IR
    /*
     * If the polarity of the incoming IR is flipped (e.g. on the Internet
     * board), then if the internal XOR input is 1, we received a falling
     * edge from the remote sensor, and we want to send out a rising edge.
     * Vice versa.
     *
     * To make minimum change to the remaining code, when we recive a 
     * falling edge, we'll tell the internal code that we have received
     * a rising edge. Vice versa.
     */
    if (IS_IRXOR_HIGH) {
	CLEAR_IRXOR;		/* set to low */
	/* If we want to kill IR, then send 0; else send 1 */
	tmp = killIR ? 0 : 1;
    } else {
	SET_IRXOR;
	falling_edge = 1; 	/* Interupt caused by IR falling edge */
	/* If we want to kill IR, then send 1; else send 0 */
	tmp = killIR ? 1 : 0;
    }
#else
    if (IS_IRXOR_HIGH) {
	CLEAR_IRXOR;		/* set to low */
	falling_edge = 1; 	/* Interupt caused by IR falling edge */
	/* If we want to kill IR, then send 1; else send 0 */
	tmp = killIR ? 1 : 0;
    } else {
	SET_IRXOR;
	/* If we want to kill IR, then send 0; else send 1 */
	tmp = killIR ? 0 : 1;
    }
#endif


#ifdef IRXMT
    if (!connect_inout) {
	/* IR comes from us, so we'll send it now */
	if (tmp) {OUTIR_HIGH;}
	else     {OUTIR_LOW;}
    }

    /* 
     * If we meant to kill IR, then IR is effectly killed now
     * i.e. CD won't get the correct key bar.
     */
    killIR = 0;	
#endif

#if (IR_NEC || IR_SANYO)
    IR_core_NEC(falling_edge);
#endif /* IR_NEC || IR_SAYNO */

#ifdef IR_PHILIPS
    IR_core_Philips(falling_edge);
#endif /* IR_PHILIPS */

}

#endif /* else of DSC_IRQ */
#endif /* IR */

#ifdef IRXMT

PRIVATE	void		RISC_start_timer1(unsigned int);
/************************************************************************
 * Local typedef.							*
 ************************************************************************/
typedef struct {
    unsigned char  level;	/* Assert this output level		*/
    unsigned char  next;	/* Goto this state			*/
    unsigned short timer;	/* Timer1 value (need to << 9)		*/
} IR_XMIT_INFO;


/* For IR transmission */
PRIVATE	unsigned char	IR_xmit_state	 = IR_XMIT_IDLE;
PRIVATE	unsigned char	IR_xmit_bitcount = 0;
PRIVATE	unsigned int	IR_xmit_code;
PRIVATE	char		origConnectInOut;

/* State machine for transmitting IR					*/
PRIVATE IR_XMIT_INFO IR_xmit_array[] = {	/* Current state	*/
    {0, IR_XMIT_LEADER_LOW,  IRW_LEADER_LOW},	/* IR_XMIT_IDLE		*/
    {1, IR_XMIT_LEADER_HIGH, IRW_LEADER_HIGH},	/* IR_XMIT_LEADER_LOW	*/
    {0, IR_XMIT_GAP,         IRW_GAP_LOW},	/* IR_XMIT_LEADER_HIGH	*/
    {0, IR_XMIT_GAP,         IRW_GAP_LOW},	/* IR_XMIT_DATA		*/
    {1, IR_XMIT_DATA,        IRW_DATA_ONE},	/* IR_XMIT_GAP		*
						 * (Possible targets 	*
						 * are IDLE, DATA, and	*
						 * REP_HIGH1)		*/
    {0, IR_XMIT_REP_LOW1,    IRW_REP_LOW1},	/* IR_XMIT_REP_HIGH1	*/
    {1, IR_XMIT_REP_HIGH2,   IRW_REP_HIGH2},	/* IR_XMIT_REP_LOW1	*/
    {0, IR_XMIT_REP_LOW2,    IRW_REP_LOW2},	/* IR_XMIT_REP_HIGH2	*/
    						/* IR_XMIT_REP_LOW2	*
						 * (disable timer1)	*/
};

/************************************************************************
 * Start timer1 (for transmitting IR signals)				*
 ************************************************************************/
PRIVATE void RISC_start_timer1(period)
unsigned int period;
{
    mvd[riface_clear_timer1] = 0;
    mvd[riface_timer1] = 0 - (period << 9);
    /* 
     * Since this routine will be called repeatedly, it is better
     * to enable interrupt outside.
     */
}

/*
 * Main routine to start tranmission of IR signal. IR transmission is
 * interrupt driven (by timer1). Therefore, this routine will enable
 * the timer1 interrupt.
 *
 * Inputs;
 *	code:		user code to be transmitted
 *	repeate:	1 transmit repeat
 *			0 transmit code
 */
void IR_send_data(unsigned char code, int repeat)
{
    register int psw;
    unsigned char code_bar;
    unsigned int begTimer = glbTimer;
    unsigned int period;

    /* 
     * We'll do detailed checking only if interrupt is enabled. 
     * If this routine is called inside the interrupt service routine,
     * then interrupt can't come in (i.e. glbTimer won't change).
     * In which case, just send the code (at worst, we'll loss the code,
     * but the machine won't hang)
     */
    asm volatile("movfrs psw,%0":  "=r" (psw) ); 

    if (!(psw & 0x10)) {
	/*
	 * If we are in the middle of receiving, then wait up to 1/8 of 
	 * a second to finish reciving. Otherwise, if we are in the middle
	 * of FF/FB/SLOW, IR misses at high frequency.
	 */