#include <msp430x14x.h>
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
BCSCTL1 |= XTS; // ACLK= LFXT1= HF XTAL
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
BCSCTL2 |= SELM_3; // MCLK = LFXT1 (safe)
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL0; // UCLK= ACLK
UBR00 = 0x45; // 8MHz 115200
UBR10 = 0x00; // 8MHz 115200
UMCTL0 = 0x00; // 8MHz 115200 modulation
UCTL0 &= ~SWRST; // Initialize USART state machine
IE1 |= URXIE0; // Enable USART0 RX interrupt
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
#pragma vector=UART0RX_VECTOR
__interrupt void usart0_rx (void)
{
while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
TXBUF0 = RXBUF0; // RXBUF0 to TXBUF0
}
这是TI官方网站上的程序,它的p3.4就没设为输出,难道TI提供的程序错了?
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