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