基于2553的超声波测距代码

ti

#include
#include"OLED.h"
#define uint unsigned int
#define uchar unsigned char
#define ulong unsigned long
uchar flag_time = 0;
ulong TIME0 = 0, TIME1 = 0;    //存放时间的函数
ulong L_juli = 0;
ulong l = 0;
uint ge,shi,bai,qian;
uchar str[10]={0};
void delay_us(uint n)
{
  uint i;
  for(i=0;i<8;i++)
n--;
}
//时钟初始化
void CLK_Init(void)
{
if (CALBC1_8MHZ ==0xFF || CALDCO_8MHZ == 0xFF)
{
      while(1);                            // If calibration constants erased
                                             // do not load, trap CPU!!
}
BCSCTL1 = CALBC1_8MHZ;                   // Set range
DCOCTL = CALDCO_8MHZ;                   // Set DCO step + modulation */
BCSCTL2 |= 0X04;                         //SMCLK为DCO的2分频，4M
}

//端口初始化
void GPIO_Init(void)
{
P1DIR = 0xf7;
P1OUT |=BIT3;
P1REN = 0X08;
P2DIR |= 0x07;
P2SEL |= 0x08;    //P2.3作为捕获输入
P2OUT &= 0xfb;    //P2.2输出低电平
//  P1IES = 0x00;       //P1.3为上升沿触发中断
//  P1IE = 0x08;       //P1.3中断允许
  // P1IFG = 0x00;       //清除中断标志
}

//定时器TIME1_A3初始化函数
void TIME1_A0_Init(void)
{
TA1CTL |= TASSEL1 + MC_2;    //SMCLK作为时钟源，连续计数模式
TA1CCTL0 |= CM_1 + CCIS_1 + SCS + CAP + CCIE; //上升沿捕获，
                                 //输入源为CCI0B，同步捕获模式，使能中断
}
void Start_Measure() //由P2.0向Trig输出10us以上的高电平，触发测距
{
// _DINT();
P2OUT|=BIT2;
delay_us(20);
P2OUT&=~BIT2;
//__enable_interrupt();
}
//主函数
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;    //关闭看门狗定时器
CLK_Init();
GPIO_Init();
TIME1_A0_Init();
initial_lcd();                            ///LCD模块初始化
clear_screen();                            //清屏
_EINT();       //中断使能
dis_GB_str(4,1,"Hello!");

while(1)
{

      //LPM0;
   //Start_Measure();
   _NOP();
   // delay_us(1000);

   if(!(P1IN&0X08))
      {

      delay_us(2000);
      if(!(P1IN&0X08))
      {
         delay_us(2000);
         if(!(P1IN&0X08))
         {
            while(!(P1IN&0X08));
            P2OUT &=~BIT2;
         P2OUT |= 0x04;                //P2.2输出高电平
         delay_us(20);
            P2OUT&=~BIT2;
         // dis_GB_str(2,1,"abCD!");
         }
      }
      }
}
}

//定时器Timer1_A  CCR0中断服务函数
#pragma vector = TIMER1_A0_VECTOR
__interrupt void TIMER1_A0__ISR(void)
{

if (flag_time == 0)
{
   TA1CCTL0=(TA1CCTL0&(~CM0))|CM1; //改为下降沿捕获：CM0置零，CM1置一
      P2OUT &= ~0x04;    //P2.2输出低电平
      TIME0 = TA1CCR0;
      flag_time ++;

}
else
{
      TIME1 = TA1CCR0;
      TA1CCTL0=(TA1CCTL0&(~CM1))|CM0; //改为上升沿捕获:CM1置零，
      flag_time = 0;
      if (TIME1 > TIME0)
      {
         TIME1 = TIME1 - TIME0;
      }
      else
      {
         TIME1 = TIME1 + (65536 - TIME0);
      }
      l = TIME1*170;
      L_juli = l/2000+14;
      ge = L_juli % 10 + 48;
      shi = (L_juli/10) % 10 + 48;
      bai = (L_juli/100) % 10 + 48;
      qian = (L_juli/1000) % 10 + 48;
      str[0]='D';
      str[1]=':';
      str[2]=qian;
      str[3]=bai;
      str[4]=shi;
      str[5]='.';
      str[6]=ge;
      str[7]='c';
      str[8]='m';
      str[9]='';
      dis_GB_str(2,1,str);
}
}
/*
//P1口中断服务函数
#pragma vector = PORT1_VECTOR
__interrupt void P1_ISR(void)
{
      P2OUT &=~BIT2;
         P2OUT |= 0x04;       //P2.2输出高电平
      P1IFG &= ~0X08;
      dis_GB_str(2,1,"ABCD!");
}
*/