代码一：
1 #include <msp430x14x.h> 2 void int_clk() 3 { 4 BCSCTL1 &= ~XT2OFF; 5 BCSCTL2 |= SELM_2 + SELS; 6 do 7 { 8 IFG1 &= ~OFIFG; 9 for(int i=0;i<100;i++) 10 _NOP(); 11 }while((IFG1 & OFIFG)!=0); 12 IFG1 &= ~OFIFG; 13 } 14 void int_usart() 15 { 16 U0CTL |= SWRST; //复位串口 17 U0CTL |= CHAR; //8位数据 18 U0TCTL |= SSEL1; //选择SMCLK 19 //波特率19200 20 U0BR1 = 0X01; 21 U0BR0 = 0XA0; 22 UMCTL0 = 0XC0; 23 24 ME1 |= UTXE0 + URXE0; //使能接收和发送 25 U0CTL &= ~SWRST; //清楚串口复位信号 26 27 IE1 |= URXIE0; //使能接收中断 28 P3SEL |= BIT4 + BIT5; 29 P3DIR |= BIT4; 30 } 31 void sent_byte(unsigned char data) 32 { 33 while((IFG1 & UTXIFG0)==0); 34 U0TXBUF = data; 35 } 36 #pragma vector=UART0RX_VECTOR 37 __interrupt void UART0(void) 38 { 39 unsigned char data = 0; 40 data = U0RXBUF; 41 sent_byte(data); 42 } 43 int main() 44 { 45 WDTCTL = WDTPW + WDTHOLD; 46 int_clk(); 47 int_usart(); 48 _EINT(); 49 return 0; 50 }
代码二：
1 #include <msp430x14x.h> 2 void int_clk() 3 { 4 BCSCTL1 &= XT2OFF; 5 BCSCTL2 |= SELS + SELM_2; 6 do 7 { 8 IFG1 &= ~OFIFG; 9 for(int i=0;i<100;i++) 10 _NOP(); 11 }while((IFG1 & OFIFG)!=0); 12 IFG1 &= ~OFIFG; 13 } 14 void int_usart() 15 { 16 U0CTL |= SWRST; 17 U0CTL |= CHAR; 18 U0TCTL = SSEL1; 19 //9600 20 U0BR1 = 0X03; 21 U0BR0 = 0X41; 22 U0MCTL = 0X00; 23 24 ME1 |= UTXE0 + URXE0; 25 U0CTL &= ~SWRST; 26 IE1 |= URXIE0; 27 28 P3SEL |= BIT4 + BIT5; 29 P3DIR |= BIT4; 30 } 31 void send_byte(unsigned char data) 32 { 33 while((IFG1 & UTXIFG0)==0); 34 U0TXBUF = data; 35 } 36 //串口0发送字符串函数 37 /*void Print_Str(char *s) 38 { 39 while(*s != ' ') 40 { 41 send_byte(*s++); 42 } 43 } 44 */ 45 #pragma vector=UART0RX_VECTOR 46 __interrupt void UART0_RX_ISR(void) 47 { 48 unsigned char data; 49 data = U0RXBUF; 50 P6OUT = data; 51 send_byte(data); 52 } 53 void main() 54 { 55 WDTCTL = WDTPW + WDTHOLD; 56 P6DIR = 0XFF; 57 P6OUT = 0XFF; 58 int_clk(); 59 int_usart(); 60 _EINT(); 61 // Print_Str("hello! "); 62 }