UART of MSP430F6779 RX is not working properly

Hello All,

I am evaluating my UART communication with MSP430F6779 device, which is mounted on customized board. I am currently can send the data on its UCA0TXBUF to send it to end device, but I am unable to Rx data continuously. I am expecting my device to receive continuous data over longer time.

Following are the Code which I have developed. Kindly go through it.

#include <msp430.h>
#include <string.h>

unsigned char uartrcv(unsigned char x,int y);
unsigned char b,v,w;
unsigned char rx[40];
int i,c,t;

void main(void)


{
    WDTCTL = WDTPW | WDTHOLD;               // Stop WDT



// Setup P3.0 UCA0RXD, P3.1 UCA0TXD
    P3SEL0 |= BIT0 | BIT1;                  // Set P3.0, P3.1 to non-IO

    P3DIR |= BIT0 | BIT1;                   // Enable UCA0RXD, UCA0TXD



// Setup LFXT1

    UCSCTL6 &= ~(XT1OFF);                   // XT1 On

    UCSCTL6 |= XCAP_3;                      // Internal load cap


// Loop until XT1 fault flag is cleared

/*
do
    {
        UCSCTL6 &= ~(XT2OFFG | XT1LFOFFG | DCOFFG);
        // Clear XT2,XT1,DCO fault flags

        SFRIFG1 &= ~OFIFG;                  // Clear fault flags

    }

while (SFRIFG1 & OFIFG);              // Test oscillator fault flag


*/

// Setup eUSCI_A0


UCA0CTLW0 |= UCSWRST;                   // **Put state machine in reset**

UCA0CTLW0 |= UCSSEL_1;                  // CLK = ACLK

UCA0BRW_L = 0x03;                       // 32kHz/9600=3.41 (see User's Guide)

UCA0BRW_H = 0x00;                       //

UCA0MCTLW = 0x5300;                     // Modulation UCBRSx=0x53, UCBRFx=0

UCA0CTLW0 &= ~UCSWRST;                  // **Initialize USCI state machine**

UCA0IE |= UCTXIE|UCRXIE;                       // Enable USCI_A0 RX interrupt



__bis_SR_register(GIE);
// Enter LPM3, interrupts enabled


__no_operation();                       // For debugger
}



// USCI_A0 interrupt service routine


#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 USCI_NONE:
            break;              // No interrupt


            case USCI_UART_UCRXIFG:             // RXIFG
                   uartrcv(b,c);
                   break;


            case USCI_UART_UCTXIFG:
                    break;      // TXIFG


            case USCI_UART_UCSTTIFG:
            break;     // TTIFG


            case USCI_UART_UCTXCPTIFG:
            break;   // TXCPTIFG


            default: break;

        }

}

unsigned char uartrcv(unsigned char x,int y)
{
int t=0;

//while (!(UCRXIFG));
    //{

        for (t=0;t<8;t++)
        {
            __delay_cycles(2000000);
            rx[t]= UCA0RXBUF;
        }


        //}
return(0);
}

In short, TX section is working with delay of 10000 count. But for the same delay_count i am unable to receive data, even i have increased the delay so that controller can read the data.

If anyone can resolve this issue?

Thank you.