[参考译文] 红外发光数据和接收未知数据

#include "msp430.h"

unsigned char IR_code;

unsigned char IR_flag;
unsigned char IR_stop;
unsigned char byte_cnt;
unsigned int bit_sel;
unsigned char *send_addr;


unsigned char send_data[8]={0xFF,0xFF,0xFF,0xFF,0x10,0xEF,0xEB,0x14};   // Unsigned data will displayed

{
    // Watchdog timer works as default setting
    WDTCTL = WDTPW + WDTHOLD;
    
    Init_GPIO();           
    Init_Clock();             
    
    IR_stop = 1;   //disable IR emitter
    
    while(1)
    {
        // clear the flag and counter
        IR_flag = 0;
        byte_cnt = 0;
        bit_sel = 0;
        
        if(IR_stop == 0)
        {
            // Configure IR output pin
            P1SEL0|= BIT0; // use internal IR modulator
            
            // disable Port1 & Port2 interrupt during IR emitting
            P1IE = 0;
            P2IE = 0;
            
            // IR_code = scan_key(); // scan the keypad
            
            // Configure IR modulation: ASK
            SYSCFG1 = IRDSSEL + IREN;
            TA1CCTL0 = CCIE;
            TA1CCTL2 = OUTMOD_7; // output mode: reset/set
            TA0CCTL2 = OUTMOD_7; // output mode: reset/set
            
            // 38kHz 1/4 duty-cycle carrier waveform length setting
            TA0CCR0 = 104;
            TA0CCR2 = 25;
            TA1CCR0 = 640; //the initial time of TA0 should be longer than TA1
            TA1CCR2 = 320;
            
            // set timer operation mode
            TA0CTL = TASSEL_2 + MC_1 + TACLR; //SMCLK, UP mode
            TA1CTL = TASSEL_2 + MC_1 + TACLR; //SMCLK, UP mode
            
            // write button number into buffer
            //send_data[2] = IR_code;
            //send_data[3] = ~IR_code;
            send_addr = &send_data[0];
            
            
            /*while (1) {
            if (buttonPressed) {
            buttonPressed = 0;
            if (!irDataValid) {
            // start IR transmission
            transmitCode(send_data);
        }
        }*/
        
        
        // stop until the end of IR code
        while(IR_stop == 0);
        
        TA0CCTL0 = 0;
        TA0CCTL2 = 0;
        TA0CTL = 0;
        TA0CCR0 = 0;
        TA0CCR2 = 0; //disable timer0
        
        TA1CCTL0 = 0;
        TA1CCTL2 = 0;
        TA1CTL = 0;
        TA1CCR0 = 0;
        TA1CCR2 = 0; //disable timer1
        
        P1IE |= (BIT3 + BIT4 + BIT5); //enable GPIO interrupt
        P2IE |= BIT7;
        
        }
        // __bis_SR_register(LPM3_bits | GIE); //enter low power mode
        IR_stop = 0; // enable IR code emitting
        
    }
}




//********Timer1 interrupt ISR*********//
#pragma vector = TIMER1_A0_VECTOR
__interrupt void TIMER1_A0_ISR (void)
{
switch( TA1IV )
{
case 0:
{
if(IR_flag)
{
IR_stop=1; // stop IR modulator
TA1CCTL0 &= ~CCIE; // disable timer_A0 interrupt

}

if((byte_cnt==0)&& (bit_sel==0)) // leading pulse burst of IR code
{
TA1CCR0 = 53999; // 9ms high
TA1CCR2 = 35999; // 4.5ms low
byte_cnt++; // byte counter
bit_sel++; // bit counter
}
else if((byte_cnt>= 5)&& (bit_sel==1)) // the end of IR code
{
TA1CCR0 = 2249; //0.562ms pulse burst to show the end
TA1CCR2 = 2249;
IR_flag=1;
}
else
{
if((*send_addr & bit_sel) == 0) // data "0"
{
TA1CCR0 = 4499; // 0.562ms high 0.562ms low
TA1CCR2 = 2249;
bit_sel<<=1;
}
else // data "1"
{
TA1CCR0 = 8999; // 0.562ms high 1.687ms low
TA1CCR2 = 2249;
bit_sel<<=1;
}
if(bit_sel>=256) // start a new byte
{
send_addr++;
byte_cnt++;
bit_sel=1;
}
}
break;
}
default: break;
}
}