#include <msp430FG437.h>
unsigned char data = 'a';
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
FLL_CTL0 |= XCAP18PF; // Configure load caps
P2SEL |= 0x30; // P2.4,5 = USART0 TXD/RXD
ME1 |= UTXE0 + URXE0; // Enable USART0 TXD/RXD
UCTL0 |= CHAR; // 8-bit character
UTCTL0 |= SSEL1; // UCLK = SMCLK
UBR00 = 0x6D; // 1MHz 9600
UBR10 = 0x00; //
UMCTL0 = 0x03; // Modulation
UCTL0 &= ~SWRST; // Initialize USART state machine
IE1 |= URXIE0; // Enable USART0 RX interrupt
P2DIR |= 0x10; // P2.4 output direction
_EINT();
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
#pragma vector=USART0RX_VECTOR
__interrupt void usart0_rx (void)
{
while (!(IFG1 & UTXIFG0)); // USART0 TX buffer ready?
//TXBUF0 = RXBUF0; // RXBUF0 to TXBUF0
TXBUF0 = data;
}
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