MSP430FR2433串口配置

若是可以的话，请上传一下您的代码或者私信您的工程给我，谢谢

以上传请查收帮忙看下，谢谢。

void USART0Initialize(void)    
{
   P1SEL0 |= BIT4+BIT5;  
  
  UCA0CTLW0 |= UCSWRST;                   // Put eUSCI in reset
  UCA0CTLW0 |= UCSSEL__SMCLK;    
  
  UCA0BR0 = 0x06;                           // 1000000/16/9600
  UCA0BR1 = 0x00;
   UCA0MCTLW =  UCOS16 | UCBRF_8;
  UCA0CTLW0 &= ~UCSWRST;                  // Initialize eUSCI
  UCA0IE |= UCRXIE;                       // Enable USCI_A0 RX interrupt
}


void USART1Initialize1(void)    
{  
  P2SEL0 |= BIT5+BIT6;  
  
  UCA1CTLW0 |= UCSWRST;                   // Put eUSCI in reset
  UCA1CTLW0 |= UCSSEL__SMCLK;  
   
  UCA1BR0 = 0x06;                           // 1000000/16/9600
  UCA1BR1 = 0x00;
   
  UCA1MCTLW = UCOS16 | UCBRF_8; 

  
  UCA1CTLW0 &= ~UCSWRST;                  // Initialize eUSCI
  UCA1IE |= UCRXIE;                       // Enable USCI_A1 RX interrupt

}



#pragma vector=USCI_A1_VECTOR
__interrupt void USCI_A1_ISR(void)
{
  
  _DINT();
  _BIC_SR_IRQ(LPM3_bits);  
  fnReDatausart1_rx();    
}


#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
{

  UCA0IFG &= ~UCRXIFG;
}




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请您使用下面的程序，UART1，测试正常

/* --COPYRIGHT--,BSD_EX
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *******************************************************************************
 *
 *                       MSP430 CODE EXAMPLE DISCLAIMER
 *
 * MSP430 code examples are self-contained low-level programs that typically
 * demonstrate a single peripheral function or device feature in a highly
 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//   MSP430FR243x Demo - eUSCI_A1 UART echo at 9600 baud using BRCLK = 16MHz
//
//  Description: This demo echoes back characters received via a PC serial port.
//  SMCLK/ DCO is used as a clock source and the device is put in LPM3
//  The auto-clock enable feature is used by the eUSCI and SMCLK is turned off
//  when the UART is idle and turned on when a receive edge is detected.
//  Note that level shifter hardware is needed to shift between RS232 and MSP
//  voltage levels.
//
//  The example code shows proper initialization of registers
//  and interrupts to receive and transmit data.
//  To test code in LPM3, disconnect the debugger.
//
//  ACLK = REFO = 32768Hz, MCLK = DCODIV = SMCLK = 16MHz.
//
//                MSP430FR2433
//             -----------------
//         /|\|                 |
//          | |                 |
//          --|RST              |
//            |                 |
//            |                 |
//            |     P2.6/UCA1TXD|----> PC (echo)
//            |     P2.5/UCA1RXD|<---- PC
//            |                 |
//
//   Ling Zhu
//   Texas Instruments Inc.
//   Nov 2019
//   Built with IAR Embedded Workbench v7.10 & Code Composer Studio v7.3
//******************************************************************************

#include <msp430.h>

void Init_GPIO();

int main(void)
{
  WDTCTL = WDTPW | WDTHOLD;                // Stop watchdog timer

  // Configure GPIO
  Init_GPIO();
  PM5CTL0 &= ~LOCKLPM5;                    // Disable the GPIO power-on default high-impedance mode
                                           // to activate 1previously configured port settings

  // Configure one FRAM waitstate as required by the device datasheet for MCLK
  // operation beyond 8MHz _before_ configuring the clock system.
  FRCTL0 = FRCTLPW | NWAITS_1;

  __bis_SR_register(SCG0);                           // disable FLL
  CSCTL3 |= SELREF__REFOCLK;                         // Set REFO as FLL reference source
  CSCTL0 = 0;                                        // clear DCO and MOD registers
  CSCTL1 &= ~(DCORSEL_7);                            // Clear DCO frequency select bits first
  CSCTL1 |= DCORSEL_5;                               // Set DCO = 16MHz
  CSCTL2 = FLLD_0 + 487;                             // DCOCLKDIV = 16MHz
  __delay_cycles(3);
  __bic_SR_register(SCG0);                           // enable FLL
  while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1));         // FLL locked

  CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;         // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
                                                     // default DCOCLKDIV as MCLK and SMCLK source

  // Configure UART pins
  P2SEL0 |= BIT5 | BIT6;                             // set 2-UART pin as second function

  // Configure UART
  UCA1CTLW0 |= UCSWRST;
  UCA1CTLW0 |= UCSSEL__SMCLK;

  // Baud Rate calculation
  // 16000000/(16*9600) = 104.167
  // Fractional portion = 0.167
  // User's Guide Table 14-4: UCBRSx = 0x11
  // UCBRFx = int ( (104.167-104)*16) = 2
  UCA1BR0 = 104;                             // 16000000/16/9600
  UCA1BR1 = 0x00;
  UCA1MCTLW = 0x1100 | UCOS16 | UCBRF_2;

  UCA1CTLW0 &= ~UCSWRST;                    // Initialize eUSCI
  UCA1IE |= UCRXIE;                         // Enable USCI_A0 RX interrupt

  __bis_SR_register(LPM3_bits|GIE);         // Enter LPM3, interrupts enabled
  __no_operation();                         // For debugger
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A1_VECTOR
__interrupt void USCI_A1_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A1_VECTOR))) USCI_A1_ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(UCA1IV,USCI_UART_UCTXCPTIFG))
  {
    case USCI_NONE: break;
    case USCI_UART_UCRXIFG:
      while(!(UCA1IFG&UCTXIFG));
      UCA1TXBUF = UCA1RXBUF;
      __no_operation();
      break;
    case USCI_UART_UCTXIFG: break;
    case USCI_UART_UCSTTIFG: break;
    case USCI_UART_UCTXCPTIFG: break;
    default: break;
  }
}

void Init_GPIO()
{
    P1DIR = 0xFF; P2DIR = 0xFF; P3DIR = 0xFF;
    P1REN = 0xFF; P2REN = 0xFF; P3REN = 0xFF;
    P1OUT = 0x00; P2OUT = 0x00; P3OUT = 0x00;
}

Hi Susan:
     在没有改变任何软硬件的前提下串口1通讯又正常了，怀疑单片机内部震荡不稳定，导致和串口工具通信的时候 电压不匹配，从而不能收发数据。串口工具的电压稳定，如下是单片机的供电部分原理图，前端是4节干电池供电，经过LDO降压给MCU的。有哪些方法可以测试下么？