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：

#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;            }          }        }                if(ir_code[0] == addr && (0xff == ir_code[0] + ir_code[1])){          if(0xff == ir_code[2] + ir_code[3]){            ir_rx_buf[ir_rx_w_offset++] = ir_code[2];          }        }      }    }        P2IE |= BIT0;;  }}

包含整理后的红外发送和接收，放在这里做个记录，有什么疑问欢迎留言讨论。


本文作者：girlkoo
本文链接：http://blog.csdn.net/girlkoo/article/details/9047123