ir.c

一个不错的硬盘播放器程序,包含VFD显示程序,红外线遥控程序,硬盘读写程序,及解码程序等.

#include "common.h"
#include "const.h"
#include "constvar.h"
#include "dsc.h"
#include "ioport.h"
#include "ir.h"
#include "mvd.h"
#include "timedef.h"
#include "util.h"
#include "Hm612ndi.h"

PRIVATE	unsigned int	prevIRtime = 0;	/* Last time IR intr. happens	*/
PRIVATE	unsigned short	dataIR;		/* System/customer IR code	*/
PRIVATE	unsigned int	diffIR[2];	/* Array to store time gap	*/
PRIVATE	char 		cntIRchg = 0;	/* Number of unprocessed IR intr*/
PRIVATE	char 		cntIRbits = 0;	/* Number of IR sys/cust. bits	*/
PRIVATE	char		killIR = 0;	/* Whether to "kill" next IR bit*/
PRIVATE volatile char	stateIR = IR_IDLE; /* IR state machine state	*/


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


void IR_recv_interrupt_service(){
    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;

    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;
    	tmp = killIR ? 0 : 1;
    }

    mvd[riface_clear_dbgirq] = 0;	/* Clear debug_irq	*/


    if (stateIR == IR_IDLE) {
    	if (falling_edge) stateIR = IR_LEADER_LOW;
    	else cntIRchg = prevIRtime = 0;
    }
    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 */
    	    width += diffIR[0];	/* Get data + gap */
    	    dataIR <<= 1;
    	    if (width > cRmDATA_1_MIN){
        		dataIR |= 0x1;
    	    } 
    	    cntIRbits++;
    	    if ((cntIRbits == 16) && (dataIR != cRmCustom)) reset = 1;

    	    if (cntIRbits == 24) {
        		GRmCodeData = dataIR & 0xff;
    	    } 
    	    else if (cntIRbits == 32){
    	        reset = 1;
                if (GRmCodeData == ((dataIR & 0xff) ^ 0xff)){
                    FRmDecodOK = 1;
                     /*
        		debug_osd("IR:",GRmCodeData,5); */
                }
            }
	    } 
	    else if (stateIR == IR_LEADER_LOW) {
    	    if ((width >= cRmLEADER_LOW_MIN) && (width <= cRmLEADER_LOW_MAX)) {
    	        stateIR = IR_LEADER_HIGH;
    	        cntIRchg = 1; /* We'll only collect 1 change next time */

    	    } 
    	    else reset = 1;
        } 
        else {
	    /* stateIR has to be equal to IR_LEADER_HIGH */
    	    if ((width >= cRmLEADER_HIGH_MIN) && (width <= cRmLEADER_HIGH_MAX)) {
    	        dataIR = cntIRbits = 0;
    	        stateIR = IR_CUSTOM;
    	    } 
    	    else reset = 1;
    	}

        if (reset) {
    	    /* Reset all, start from the very beginning */
    	    stateIR = IR_IDLE; 
    	    cntIRchg = prevIRtime = 0; 
    	}
    }
    return;
}



void IR_send_data(unsigned char code, int repeat){
    ++code;
    ++repeat;
    return;
}
void IR_xmit_interrupt_service(void){
}