msp430超声波测距程序.doc

#include msp430x14x.h#include 1602.c#define uint unsigned int #define uchar unsigned charvoid USARTinit();void timeinit();long static uint distance=0;uchar table=gu zhuanyuan;/*void delay(uint y) uint x; for(;y0;y-) for(x=100;x0;x-); */uchar i=0,j=0;void main( ) / Stop watchdog timer to prevent time out reset WDTCTL = WDTPW + WDTHOLD;/ USARTinit(); P1DIR|=BIT0; P2DIR=0XFF; timeinit(); lcdinit(); display_string(3,1,table); P1IE=BIT1; P1IES&=BIT1; while(1) P1OUT|=BIT0; delay(1); P1OUT&=BIT0; delay(1000); display_one(1,0,(distance/10000)%10+0x30); display_one(2,0,(distance/1000)%10+0x30); display_one(3,0,(distance/100)%10+0x30); display_one(4,0,(distance/10)%10+0x30); display_one(5,0,distance%10+0x30); void timeinit() TACTL=TASSEL_2+ID_3+MC_1;/ID_2表示八分频！ MC_1表示连续计数模式！ BCSCTL2=0x88;/选择SMCLK的信号源XT2CLK（8MHz） CCR0=65535; _EINT(); /打开总中断！ #pragma vector=PORT1_VECTOR_interrupt void port1_int(void) if(P1IN&BIT1)=BIT1) TACTL|=MC_1+TACLR; P1IES|=BIT1; else TACTL&=MC_3; P1IES&=BIT1; distance=TAR*5/3; P2OUT=TAR; P1IFG&=BIT1;#include msp430x14x.h#define uint unsigned int#define uchar unsigned charvoid lcdinit();void writecommand(uchar wdata);void writedata(uchar wdata);void delay(uint y);void display_xy(uchar x,uchar y);void display_one(uchar x,uchar y,uchar c);void display_string(uchar x,uchar y,uchar *s);void lcdinit() P4DIR=0XFF; P3DIR=0xff; delay(1); writecommand(0x38); /必须要有，显示模式设置，设置为16*2显示，5*7点阵，8位数据接口！/ delay(50); writecommand(0x08); /关闭显示,要不要都可以 writecommand(0x01); /显示清屏 writecommand(0x0f); /开显示，显示光标，光标闪烁！ writecommand(0x06); /读/写作用时地址自动加一void writecommand(uchar wdata) P3OUT &=BIT0; /使RS=0，表示写命令 P3OUT &=BIT1; /rw=0， 表示向1602里面写数据 / P3OUT &=BIT2; /E=0 delay(1); P3OUT |=BIT2; /使能E置一 P4OUT=wdata; /送命令 delay(10); /短暂延时，代替检测忙状态,产生方波！ P3OUT &=BIT2; /使能E=0，下降沿将命令货数据送入1602 void writedata(uchar wdata) P3OUT |=BIT0; /使RS=1，表示写数据 P3OUT &=BIT1; /rw=0， 表示向1602里面写数据 / P3OUT &=BIT2; 可以加，也可以不加！ delay(1); P3OUT |=BIT2; P4OUT=wdata; delay(10); P3OUT &=BIT2; void delay(uint y) uint x; for(;y0;y-) for(x=100;x0;x-);/用8MHz的总频率！ void display_xy(uchar x,uchar y) /找字符串的地址！ if(y=0x01) x=x+0x40+0x80; /首地址0X80，,第二行地址0X80+0X40! else x=0x80+x; writecommand(x); void display_string(uchar x,uchar y,uchar *s) /显示字符串 display_xy(