Other Parts Discussed in Thread: MSP-EXP430F5529LP
#include <msp430f5529.h> void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop WDT P3SEL |= BIT3+BIT4; // P3.3,4 = USCI_A0 TXD/RXD UCA0CTL1 |= UCSWRST; // **Put state machine in reset** UCA0CTL1 |= UCSSEL_2; // SMCLK UCA0BR0 = 9; // 1MHz 115200 (see User's Guide) UCA0BR1 = 0; // 1MHz 115200 UCA0MCTL |= UCBRS_1 + UCBRF_0; // Modulation UCBRSx=1, UCBRFx=0 UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine** UCA0IE |= UCRXIE; // Enable USCI_A0 RX interrupt __bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled __no_operation(); // For debugger } // Echo back RXed character, confirm TX buffer is ready first #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; } }