code.c

MSP430 串口通讯通过中断实现

#include  <msp430x14x.h>

void InitBcs(void);
void InitUART1(void);
void main(void)
{
  InitBcs();
  InitUART1();
  _EINT();

  _BIS_SR(LPM0_bits + GIE);                 // Enter LPM0 w/ interrupt
}

#pragma vector=UART1RX_VECTOR
__interrupt void usart1_rx (void)
{
  
   while (!(IFG2 & UTXIFG1));  
   TXBUF1 = RXBUF1;                          // RXBUF0 to TXBUF0
}

void InitBcs(void)
{
         unsigned int i;     
         WDTCTL=WDTPW+WDTHOLD;                           //关闭关门狗
        _BIS_SR(OSCOFF);                                
	BCSCTL1&=~XT2OFF;				//XT2开启 											//启动XT2振荡器，
	BCSCTL1 |= RSEL0+RSEL1+RSEL2;                   // 选择最高不标称频率
	DCOCTL = 0xE0;																	//DCOCLK频率最高，不利用MOD进行调整
	do
	{
		IFG1 &= ~OFIFG;						// Clear OSCFault flag
		for(i=0xFF;i>0;i--);				// Time for flag to set
	}
	while((IFG1 & OFIFG) == OFIFG);			// OSCFault flag still set?
	_NOP();		
	BCSCTL2 |= SELS+DIVS_2;                        //SMCLK  SOURCE  XT2/4=460.8KHz 
}

void InitUART1(void)
{
  P3SEL |= BIT6+BIT7;                            // P3.6,7 = USART1 TXD/RXD
  U1CTL |= SWRST;  
  U1CTL |= CHAR;                            // 8-bit character
  U1TCTL |= SSEL1;                          // UCLK = ACLK
  U1BR0 = 0x30;                             // 32k/9600 - 3.41
  U1BR1= 0x00;                             //
  U1MCTL = 0x00;                            // Modulation
  U1CTL &= ~SWRST;                          // Initialize USART state machine  
  ME2 |= UTXE1 + URXE1;                     // Enable USART0 TXD/RXD
  IE2 |= URXIE1;                            // Enable USART0 RX interrupt
  //IFG2 &= ~UTXIFG1;
  
}