MSP430F149学习之路——UART

代码一：

#include <msp430x14x.h>
void int_clk()
{
  BCSCTL1 &= ~XT2OFF;
  BCSCTL2 |= SELM_2 + SELS; 
  do
  {
    IFG1 &= ~OFIFG;
    for(int i=0;i<100;i++)
      _NOP();
  }while((IFG1 & OFIFG)!=0);
  IFG1 &= ~OFIFG;
}
void int_usart()
{
  U0CTL |= SWRST;    //复位串口
  U0CTL |= CHAR;     //8位数据
  U0TCTL |= SSEL1;   //选择SMCLK
  //波特率19200
  U0BR1 = 0X01;
  U0BR0 = 0XA0;
  UMCTL0 = 0XC0;
   
  ME1 |= UTXE0 + URXE0;   //使能接收和发送
  U0CTL &= ~SWRST;        //清楚串口复位信号
  
  IE1 |= URXIE0;          //使能接收中断
  P3SEL |= BIT4 + BIT5;
  P3DIR |= BIT4;
}
void sent_byte(unsigned char data)
{
  while((IFG1 & UTXIFG0)==0);
  U0TXBUF = data;
}
#pragma vector=UART0RX_VECTOR
__interrupt void UART0(void)
{
  unsigned char data = 0;
  data = U0RXBUF;
  sent_byte(data);
}
int main()
{
  WDTCTL = WDTPW + WDTHOLD;
  int_clk();
  int_usart();
  _EINT();
  return 0;
}

代码二：

#include <msp430x14x.h>
void int_clk()
{
  BCSCTL1 &= XT2OFF;
  BCSCTL2 |= SELS + SELM_2;
  do
  {
    IFG1 &= ~OFIFG;
    for(int i=0;i<100;i++)
      _NOP();
  }while((IFG1 & OFIFG)!=0);
  IFG1 &= ~OFIFG;
}
void int_usart()
{
  U0CTL |= SWRST;
  U0CTL |= CHAR;
  U0TCTL = SSEL1;
   //9600
  U0BR1 = 0X03;
  U0BR0 = 0X41;
  U0MCTL = 0X00;
 
  ME1 |= UTXE0 + URXE0;
  U0CTL &= ~SWRST;
  IE1 |= URXIE0;
  
  P3SEL |= BIT4 + BIT5;
  P3DIR |= BIT4;
}
void send_byte(unsigned char data)
{
  while((IFG1 & UTXIFG0)==0);
  U0TXBUF = data;
}
//串口0发送字符串函数
/*void Print_Str(char *s)
{
  while(*s != '')
  {
    send_byte(*s++);
  }
}
*/
#pragma vector=UART0RX_VECTOR
__interrupt void UART0_RX_ISR(void)
{
  unsigned char data;
  data = U0RXBUF;
  P6OUT = data;
  send_byte(data);
}
void main()
{
  WDTCTL = WDTPW + WDTHOLD;
  P6DIR = 0XFF;
  P6OUT = 0XFF;
  int_clk();
  int_usart();
  _EINT();
//  Print_Str("hello!
");
}