chaoshengbo.rar_超声波 430

#include<msp430X14X.h> #define uint unsigned int #define uchar unsigned char uint time=0; //超声波测量的时间存储 uchar strat = 1; //测超声波开始停止标志 uchar led7[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; void delay(uint time); void led(uchar duan,uchar wei,uchar dian); void csbini(); //超声波初始化 void csbqd(); //测超声波 void main(void) { WDTCTL = WDTPW+WDTHOLD; DCOCTL |= DCO0+DCO1; BCSCTL1 |= RSEL0+RSEL1+RSEL2; //设置DCO时钟为1MH csbini(); while(1) { csbqd(); led(time/1000,4,0); led(time%1000/100,3,0); led(time%100/10,2,1); led(time%10,1,0); } } void delay(uint time) { while(time--); } /*************************************** 函数名：led 功能 ：数码管显示函数 参数 ：1-duan 要显示的数据 2-wei 要在那位数码管上显示（从1开始） 3-dian 为1显示小数点，为零不显示小数点 ***************************************/ void led(uchar duan,uchar wei,uchar dian) { P5DIR = 0XFF; P4DIR = 0XFF; if(dian) P5OUT = led7[duan]-0x80; else P5OUT = led7[duan]; P4OUT = ~(1<<wei-1); delay(100); P4OUT = 0XFF; } void csbini() { DCOCTL |= DCO0+DCO1; BCSCTL1 |= RSEL0+RSEL1+RSEL2; //设置DCO时钟为1MH P1DIR |= BIT0; //P1.0设置为超声波T输出 P1DIR &= ~BIT1; //P1.1设置为超声波E输入 P1SEL |= BIT1; //启动P1.1的第二功能 TACTL |= TASSEL_2+TACLR+TAIE; //TA SMCLK为时钟源，清零 TACCTL0 |= CM_3 +SCS+CAP+CCIE; //TACCR0 为上升下降延同步捕获模式，开中断 _EINT(); //开总中断 } void csbqd() { if(strat) //启动信号判断 { strat = 0; //清零 P1OUT |= BIT0; //从P1.0输出10us以上的高电平 delay(30); P1OUT &= ~BIT0; TACTL |= TACLR; //定时器A清零 TACTL |= MC_2; //启动定时器为连续计数模式 } } #pragma vector=TIMERA0_VECTOR __interrupt void timera0() { if(!(TACCTL0&CCI)) //判断下降延是否到来 { P2OUT = 0Xff; time = TACCR0; //读取高电平值 time=(uint)(time *0.504); //计算出距离（单位mm） TACTL &= ~(MC0+MC1); //关定时器TA strat = 1; //在次启动超声波测距 } TAR = 0; //清计数器TAR TACCR0 =0; //清TACCR0 } #pragma vector=TIMERA1_VECTOR __interrupt void timera1() { if(TAIV==0X0A) { TACTL &= ~(MC0+MC1); //关定时器TA time = 0; } }