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MSP430F5528: UART

pabel sahu
Intellectual 480 points
Part Number: MSP430F5528


Hi,

I am configuring a UART communication with rf transmitter. Below is the code:

#include <stdio.h>
#include <msp430.h>
void main()
{
    WDTCTL = WDTPW | WDTHOLD;       // stop watchdog timer
    P4SEL |= 0x30; // P4.4,5 = USART0 TXD/RXD
    P4DIR |= 0x90;
    UCA1CTL1 |= UCSWRST;
    UCA1CTL1 |=UCSSEL_2;
    UCA1BR0=0x03;
    UCA1BR1=0x00;
    UCA1MCTL=0x03;
    UCA1CTL1 &= ~(UCSWRST);
    UCA1IE|= UCTXIE ;

 while (!(UCA1IFG & UCTXIFG)); // USART0 TX buffer ready?
    {
    UCA1TXBUF = 0x42;
    
}
}

In the above code I have selected UCA1TXD pin. Baud rate is 9600 and here I am transferring one byte 42.  In receiver section I have programmed accordingly. I have written this after studying msp430f5528 users' guide. Transmitter and receiver modules are working because I have programmed in other MCU and it is working fine. Please help me in this.

 

  • 0
    TI__Intellectual 985 points

    Hi Pabel, do you have programmed the interrupt service routine right?

    You have enabled the UCTXIE, but could not see any interrupt service routine in your code.

  • 0 in reply to Peter Weber
    Intellectual 480 points

    Hi,

    I don't need that. I need only UCTXIFG interrupt and that I am checking in code.

    #include <stdio.h>
#include <msp430.h>
void main()
{
    WDTCTL = WDTPW | WDTHOLD;       // stop watchdog timer
    P4SEL |= 0x30; // P4.4,5 = USART0 TXD/RXD
    P4DIR |= 0xD0;
    UCA1CTL1 |= UCSWRST;
    UCA1CTL1 |=UCSSEL_2;
    UCA1BR0=0x03;
    UCA1BR1=0x00;
    UCA1MCTL=0x03;
    UCA1CTL1 &= ~(UCSWRST);


 if (!(UCA1IFG & UCTXIFG)); // USART0 TX buffer ready?
    {
    UCA1TXBUF = 0x85;
    P4OUT |=BIT6;
}
}

    Please help..

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