/*
完成时间:2012年7月19日21时19分58秒
程序功能:串口测试
*/
#include "msp430g2553.h"
unsigned char temp[] = "welcome!";
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
BCSCTL1 = CALBC1_1MHZ; // Set DCO
DCOCTL = CALDCO_1MHZ;
P1SEL = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
P1SEL2 = BIT1 + BIT2 ; // P1.1 = RXD, P1.2=TXD
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 104; // 1MHz 9600
UCA0BR1 = 0; // 1MHz 9600
UCA0MCTL = UCBRS0; // Modulation UCBRSx = 1
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
}
// Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
unsigned char i = 0;
while (!(IFG2&UCA0TXIFG)); // 发送中断标志检测,每次发送后都要检测
//直到发送完成,才可发送下个字节的数据
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
if (UCA0RXBUF == 'H')
{
while (temp != '\0')
{
UCA0TXBUF = temp;
while (!(IFG2 & UCA0TXIFG));
i++;
}
}
}