MSP430(F149)学习笔记——红外接收

用MSP430（F149）做红外接收比发送更为简单，我采用的红外传感器是HS0038B，这个原件在接收到38K红外时输出低电平，否则输出高电平，因此，我们就可以从这点开始编写程序了，由于HS0038B的电路图很多，我这里就不贴出来了，下面是具体的代码：

[cpp]
#include <msp430x14x.h>
#include "delay.h"

static unsigned short addr = 0x00;
static unsigned char ir_rx_buf[256];
static unsigned char ir_rx_w_offset = 0;
static unsigned char ir_rx_r_offset = 0;

void ir_tx_open(){
P2DIR |= BIT2 | BIT3;//P2.2, P2.3输出
P2SEL |= BIT3; //P2.2:IO P2.3:TA0
P2SEL &= ~BIT2; //
P2OUT &= ~(BIT2 | BIT3);

//38K->P2.3
CCR0 = (int)(26.3*8 + 0.5);
CCTL1 = OUTMOD_6;
CCR1 = (int)(13.15*8 + 0.5);

TACTL = TASSEL_2 + MC_1;
}

void ir_set_addr(unsigned char addr){
addr = (unsigned char)(0xff&addr);
}

static void ir_start(){
P2OUT |= BIT2;
delay_us(9000);

P2OUT &= ~BIT2;
delay_us(4500);
}

static void ir_next(){
P2OUT |= BIT2;
delay_us(9000);

P2OUT &= ~BIT2;
delay_us(2250);
}

static void ir_send_byte(unsigned char c){
unsigned char i;

for(i = 0; i != 8; ++i){
    P2OUT |= BIT2;
    delay_us(560);

    P2OUT &= ~BIT2;
    if(c&0x01){
      delay_us(1685);
    }
    else{
      delay_us(565);
    }

    c >>= 1;
}
}

static void ir_end(){
P2OUT |= BIT2;
delay_us(300);
P2OUT &= ~BIT2;
}

void ir_put_char(unsigned char c){
ir_start();
ir_send_byte(addr);
ir_send_byte(~addr);
ir_send_byte(c);
ir_send_byte(~c);
ir_end();
}

void ir_put_string(char* str){
if(*str != '\0')
    ir_start();
else
    return;
while(1){
    ir_send_byte(addr);
    ir_send_byte(~addr);
    ir_send_byte(*str);
    ir_send_byte(~(*str));

    ++str;

    if(*str != '\0'){
      ir_next();
    }
    else{
      ir_end();
    }
}
}

void ir_put_array(unsigned char* array, unsigned int length){
unsigned int i;

ir_start();

for(i = 0; i != length; ++i){
    ir_send_byte(addr);
    ir_send_byte(~addr);
    ir_send_byte(array[i]);
    ir_send_byte(array[i]);

    if(i < length-1){
      ir_next();
    }
    else{
      ir_end();
    }
}
}

void ir_tx_close(){
P2SEL &- ~BIT3;
P2DIR |= BIT3;
P2OUT &= ~BIT3;
TACTL = TACLR;
}

void ir_rx_open(){
P2SEL &= ~BIT0; //I/O
P2DIR &= ~BIT0; //Input
P2IES |= BIT0; //High->Low
P2IE |= BIT0; //Enable interrupt
}

void ir_rx_close(){
P2IE &= ~BIT0; //Disable interrupt
}

unsigned char ir_get(){
while(ir_rx_r_offset == ir_rx_w_offset);
return ir_rx_buf[ir_rx_r_offset++];
}

#pragma vector=PORT2_VECTOR
__interrupt void port2_handler(){
static unsigned char ir_code[4];
unsigned char i, j;
unsigned short time;

if(P2IFG&BIT0){
    P2IE &= ~BIT0;
    P2IFG &= ~BIT0;
    _EINT();

    time_start(9500);
    while(!time_out() && !(P2IN&BIT0));
    time = time_end();
    if(!time_out() && time > 8500){
      time_start(5000);
      while(!time_out() && (P2IN&BIT0));
      time = time_end();
      if(!time_out() && time > 4000){
        for(i = 0; i != 4; ++i){
          for(j = 0; j != 8; ++j){
            while(!(P2IN&BIT0));//等待高电平
            time_start(2000);   //计时高电平
            while(!time_out() && (P2IN&BIT0));
            time = time_end();
            ir_code[i] >>= 1;
            if(!time_out() && time > 1500){
              //uart_put(0x03);
              ir_code[i] |= 0x80;
            }
            else{
              //uart_put(0x04);
              ir_code[i] &= 0x7f;
            }
       &n

补充：软件开发 , C++ ,