[LaunchPad] 串口测试

  1 #include  "msp430g2553.h"

  2 #include  "stdio.h"

  3 

  4 

  5 unsigned char RxBuf[256]="haha";

  6 unsigned char RxFlag;

  7 unsigned char RxPoint;

  8 

  9 

 10 int putchar(int ch)

 11 {

 12   while(!(IFG2&UCA0TXIFG));

 13    UCA0TXBUF=ch;

 14    return ch;

 15 }

 16 

 17 

 18  void sendChar(unsigned char c)

 19  {

 20    while(!(IFG2&UCA0TXIFG));

 21    UCA0TXBUF=c;

 22  }

 23 

 24  void sendStr(unsigned char *s)

 25  {

 26        while(*s!='\0')

 27        {

 28                sendChar(*s);

 29                s++;

 30        }

 31  }

 32  

 33  void main(void)

 34  

 35  {

 36  

 37  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT

 38  

 39   BCSCTL1 = CALBC1_1MHZ;                    // Set DCO

 40   DCOCTL = CALDCO_1MHZ;

 41   BCSCTL2 &= ~(DIVS_3);

 42  

 43  

 44   P1SEL = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD

 45   P1SEL2 = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD

 46  

 47   UCA0CTL1 |= UCSSEL_2;                     // SMCLK

 48   UCA0BR0 = 104;                            // 1MHz 9600

 49   UCA0BR1 = 0;                              // 1MHz 9600

 50   UCA0MCTL = UCBRS0;                        // Modulation UCBRSx = 1

 51   UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

 52  

 53   IE2 |= UCA0RXIE;   // Enable USCI_A0 RX interrupt

 54   

 55   

 56   RxFlag=0; 

 57   RxPoint=0;

 58   _EINT();

 59   

 60  

 61  printf("\n%s\n","========串口测试=========");

 62 

 63  //__bis_SR_register(LPM0_bits + GIE);       // Enter LPM0, interrupts enabled

 64  

 65  

 66   while(1)

 67   {

 68   __delay_cycles(1000000);

 69  if(RxFlag == 0)

 70   printf("%s\n",RxBuf); 

 71   }

 72   

 73   

 74  }

 75  

 76  //  Echo back RXed character, confirm TX buffer is ready first

 77  

 78  #pragma vector=USCIAB0RX_VECTOR

 79  __interrupt void USCI0RX_ISR(void)

 80  {

 81 

 82 

 83   while (!(IFG2&UCA0TXIFG));                // USCI_A0 TX buffer ready?

 84  

 85   if(RxFlag == 0)

 86   {

 87     RxFlag = 1;

 88     RxBuf[RxPoint] = UCA0RXBUF;

 89      RxPoint++;

 90   }

 91   else

 92   {

 93      if(UCA0RXBUF=='*')

 94     {

 95       putchar('$');

 96       RxBuf[RxPoint]='\0';

 97       RxFlag = 0;

 98       RxPoint = 0;

 99     }

100     else

101     {

102         RxBuf[RxPoint] = UCA0RXBUF;

103         RxPoint++;

104     }

105   }

106  

107  }

HW模式，RxFlag=0，表示接收完毕，=1为正在接收，实现printf函数