串口简单的发送字符和发送字符串、串口中断 用于专门传送AT指令的

void UARTSend(const char *str)//串口0发送
{
unsigned int i=8;
while(i--)
{
while (!(UCA0IFG&UCTXIFG));//等闲
UCA0TXBUF=*str++;//发数据
}
}      这个算串口的字符串传送可以吗

#include<msp430f5529.h>
void SerialSendChars(char *str) //传送字符串
{

while(*str!='\r')
{
UCA0TXBUF=*str;
while(!(UCA0IFG&UCTXIFG));
str++;
}

}
void UartPrintASCII(unsigned char c) //发送一个字符
{

while(UCTXIFG==0);
UCA0TXBUF=c;
}
void delay_50ms(int t)
{
int j;
for(;t>0;t--)
for(j=6245;j>0;j--)
;
}
void main()
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL = BIT3+BIT4; // P3.4,5 = USCI_A0 TXD/RXD
UCA0CTL1 |= UCSWRST; // **Put state machine in reset**
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 6; // 1MHz 9600 (see User's Guide)
UCA0BR1 = 0; // 1MHz 9600
UCA0MCTL = UCBRS_0 + UCBRF_13 + UCOS16; // Modln UCBRSx=0, UCBRFx=0,
// over sampling
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
UCA0IE |= UCTXIE; // Enable USCI_A0 RX interrupt

SerialSendChars("AT\r\n");//先发AT，让GSM模块自动获取波特率为9600
delay_50ms(1000);
SerialSendChars("AT+CMGF=1\r\n");
delay_50ms(1000);

SerialSendChars("AT+CSCS=\"GSM\"\r\n");
delay_50ms(1000);

SerialSendChars("AT+CMGS=\"18559061451\"\r\n"); //替换为需要接收短信的号码
delay_50ms(1000);

SerialSendChars("SIM800 MSG SEND TEST"); //英文短信内容
delay_50ms(1000);

UartPrintASCII(0x1a);
while(1);
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
}

#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
{
switch(__even_in_range(UCA0IV,4))
{
case 0:break; // Vector 0 - no interrupt
case 2: // Vector 2 - RXIFG
while (!(UCA0IFG&UCTXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF; // TX -> RXed character
break;
case 4:break; // Vector 4 - TXIFG
default: break;
}
}

这个怎么不行？