MSP430F5529: Two MSP430F5529 Launch pads communication using UART (USCI_A0)

Hello,

I am trying to send the character 'r' (0x72) from one msp430f5529 launchpad to other using UART. The other launchpad detects 'r' (0x72) and glows the LED at p1.0.

This is my Code for both the launchpads.

Transmitter

#include <msp430.h>

int 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

while(1){

while(UCA0STAT & UCBUSY);

UCA0TXBUF = 0x72;

}

__no_operation(); // For Debugge

}

Receiver

#include <msp430.h>

unsigned int k;

int main(void)

{

WDTCTL = WDTPW + WDTHOLD; // Stop WDT

P3SEL |= BIT3+BIT4; // P3.3,4 = USCI_A0 TXD/RXD

WDTCTL = WDTPW+WDTHOLD; // Stop WDT

P1DIR |= BIT0; // P1.0 set as output

P1OUT &= ~BIT0;

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

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)

#pragma vector=USCI_A0_VECTOR

__interrupt void USCI_A0_ISR(void)

#elif defined(__GNUC__)

void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)

#else

#error Compiler not supported!

#endif

{

switch(__even_in_range(UCA0IV,4))

{

case 0:break; // Vector 0 - no interrupt

case 2:

k = UCA0RXBUF; // TX -> RXed character

if (k == 0x72)

P1OUT |= BIT0;

break;

case 4:break; // Vector 4 - TXIFG

default: break;

}

}

I connected P3.3, P3.4 of tx launchpad to P3.4, P3.3 of rx launchpad resp. I am receiving garbage values in UCA0RXBUF and the led is not glowing.

Any mistakes I have done in the Code?