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[LaunchPad] 超声波测试，数码管显示

  1 #include "io430g2553.h"
  2 
  3 unsigned char    Disp_Tab[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};  //段码控制 
  4 unsigned char    dispbit[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdF,0xbF,0x7F};    //位选控制 
  5 
  6 unsigned char LedOut[4];
  7 
  8 unsigned int num =1234;
  9 unsigned int time;
 10 unsigned char i;
 11 
 12 unsigned char RxFlag;
 13 unsigned char Byte_H;
 14 unsigned char Byte_L;
 15 
 16 void selectled(unsigned char led)
 17  {
 18    switch(led)
 19    {
 20    case 0:
 21      P2OUT_bit.P5=0;
 22      P1OUT_bit.P6=1; 
 23      P1OUT_bit.P7=1;
 24      break;
 25    case 1:
 26      P2OUT_bit.P5=1;
 27      P1OUT_bit.P6=0; 
 28      P1OUT_bit.P7=1;
 29      break;
 30    case 2:
 31      P2OUT_bit.P5=1;
 32      P1OUT_bit.P6=1; 
 33      P1OUT_bit.P7=0;
 34      break;
 35    default:
 36      P2OUT_bit.P5=1;
 37      P1OUT_bit.P6=1; 
 38      P1OUT_bit.P7=1;
 39      break;  
 40    }
 41  }
 42  
 43  void showled(unsigned char led)
 44  {
 45  
 46    if(led & 0x01)    P1OUT_bit.P3=1;
 47     else P1OUT_bit.P3=0;
 48     
 49    if(led & 0x02)    P1OUT_bit.P4=1;
 50     else P1OUT_bit.P4=0;
 51     
 52    if(led & 0x04)    P1OUT_bit.P5=1;
 53     else P1OUT_bit.P5=0;
 54     
 55    if(led & 0x08)    P2OUT_bit.P0=1;
 56     else P2OUT_bit.P0=0;
 57     
 58    if(led & 0x10)    P2OUT_bit.P1=1;
 59     else P2OUT_bit.P1=0; 
 60     
 61    if(led & 0x20)    P2OUT_bit.P2=1;
 62     else P2OUT_bit.P2=0; 
 63     
 64    if(led & 0x40)    P2OUT_bit.P3=1;
 65     else P2OUT_bit.P3=0; 
 66     
 67    if(led & 0x80)    P2OUT_bit.P4=1;
 68     else P2OUT_bit.P4=0; 
 69  
 70  }
 71  
 72   int putchar(int ch)
 73  {
 74    while(!(IFG2&UCA0TXIFG));
 75     UCA0TXBUF=ch;
 76     return ch;
 77  }
 78  
 79 
 80   void sendChar(unsigned char c)
 81   {
 82     while(!(IFG2&UCA0TXIFG));
 83     UCA0TXBUF=c;
 84   }
 85 
 86 void main()
 87 {
 88   
 89 WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
 90   
 91 P1DIR=0xff;
 92 P2DIR=0xff;
 93 
 94   P1SEL = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD
 95   P1SEL2 = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD
 96   UCA0CTL1 |= UCSSEL_2;                     // SMCLK
 97   UCA0BR0 = 104;                            // 1MHz 9600
 98   UCA0BR1 = 0;                              // 1MHz 9600
 99   UCA0MCTL = UCBRS0;                        // Modulation   UCBRSx = 1
100   UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine** 
101   IE2 |= UCA0RXIE;   // Enable USCI_A0 RX interrupt 
102   __bis_SR_register(GIE);
103   
104   
105 while(1)
106 {
107   
108 time++;
109 if(time>50)
110 {
111   time=0;
112   sendChar(0x55);
113   __delay_cycles(1000);
114   if(num>500) P1OUT_bit.P0=1;
115   else P1OUT_bit.P0=0;
116 }
117      LedOut[3]=Disp_Tab[num%10000/1000];       //千位
118      LedOut[2]=Disp_Tab[num%1000/100];
119      LedOut[1]=Disp_Tab[num%100/10];           //十位
120      LedOut[0]=Disp_Tab[num%10];             //个位
121   
122 for(i=0;i<4;i++)
123 {
124   showled(LedOut[i]);
125   selectled(i);
126     __delay_cycles(1000);
127 }
128 }
129 
130 }
131 
132 #pragma vector=USCIAB0RX_VECTOR
133   __interrupt void USCI0RX_ISR(void)
134   {
135  
136   while (!(IFG2&UCA0TXIFG));                // USCI_A0 TX buffer ready?
137   
138    if(RxFlag == 0)
139    {
140      Byte_H=UCA0RXBUF;
141      RxFlag=1;
142    }
143    else
144    { 
145        Byte_L=UCA0RXBUF;
146        num=Byte_H*256+Byte_L;
147        RxFlag = 0;
148    }
149 }

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原文地址：https://www.cnblogs.com/sky1991/p/2656182.html