MSP430F5529: 串口接受波特率为9600的数据并显示在OLED屏幕上读取的数据只能显示一次，会卡住不动不能一直实时显示，怀疑是串口数据量大波特率高导致串口中断溢出的问题

#include <msp430.h>
#include <driverlib.h>
#include "system.h"
#include "OLED.h"
#include "MSP430F5529_I2C.h"
#include "mpu6050.h"
#include "uart.h"
#include "pwm.h"
#include "hongwai.h"

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define MCLK_IN_HZ 25000000
#define delay_us(x) __delay_cycles((MCLK_IN_HZ/1000000*(x)))
#define delay_ms(x) __delay_cycles((MCLK_IN_HZ/1000*(x)))

float Yaw;
float Roll;
float Pitch;

int16_t ROLL,ROLL_L;
int16_t PITCH,PITCH_L;
int16_t YAW,YAW_L;
int16_t TEM,TEM_L;
int16_t sum;

int16_t flag = 0;


float data_process(int16_t num)
{
    float result=0;
    
    result = num / 32768.0 * 180.0;
    
    if(result<=180)
    {
        return result;
    }
    else
    return result-360;
}

void unlock(void)
{
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xFF);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xAA);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x69);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x88);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xB5);
    
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xFF);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xAA);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x03);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x03);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x00);
    
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xFF);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xAA);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x04);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x02);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x00);
    
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xFF);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0xAA);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x00);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x00);
    USCI_A_UART_transmitData(USCI_A1_BASE, 0x00);
}
/**
* main.c
*/
int main(void)
{
    WDTCTL = WDTPW | WDTHOLD; // stop watch dog timer
    
    SystemClock_Init();
    
    Init_I2C_GPIO();
    I2C_init(OLED_ADDRESS >> 1);
    
    // UART_Init(USCI_A0_BASE, 115200);
    UART_Init(USCI_A1_BASE, 9600);
    unlock();
    // UART_Init(USCI_A1_BASE, 4800);
    
    // GPIO_setAsOutputPin(GPIO_PORT_P6, GPIO_PIN5);
    
    PWM_Init();
    
    __bis_SR_register(GIE);
    
    
    OLED_Init();
    OLED_Clear();
    OLED_Display_On();
    
    
    while(1)
    {
        //GPIO_toggleOutputOnPin(GPIO_PORT_P6, GPIO_PIN5);
        // USCI_A_UART_resetDormant (USCI_A1_BASE);
        Roll = data_process(ROLL);
        Pitch = data_process(PITCH);
        Yaw = data_process(YAW);
        OLED_ShowSignedNum(0, 0, (int16_t)Roll, 5, 16);
        OLED_ShowSignedNum(0, 2, (int16_t)Pitch, 5, 16);
        OLED_ShowSignedNum(0, 4, (int16_t)Yaw, 5, 16);
        delay_ms(200);
    }
    
    //return 0;
}


//****************************中断函数******************************************

//******************************************************************************
//
//This is the USCI_A0 interrupt vector service routine.
//
//******************************************************************************
//#pragma vector=USCI_A0_VECTOR
//__interrupt void USCI_A0_ISR (void)
//{
//  uint8_t receivedData = 0;
//  switch (__even_in_range(UCA0IV,4))
//  {
//      Vector 2 - RXIFG
//      case 2:
//      receivedData = USCI_A_UART_receiveData(USCI_A0_BASE);
//      USCI_A_UART_transmitData(USCI_A0_BASE,receivedData);
//
//      break;
//      default:
//      break;
//  }
//}

//******************************************************************************
//
//This is the USCI_A1 interrupt vector service routine.
//
//******************************************************************************
#pragma vector=USCI_A1_VECTOR
__interrupt void USCI_A1_ISR (void)
{
    
    static int state = 0;
    uint8_t receivedData = 0;
    switch (__even_in_range(UCA1IV,4))
    {
        //Vector 2 - RXIFG
        case 2:
        receivedData = USCI_A_UART_receiveData(USCI_A1_BASE);
        if(state>1)
        {
            if(state<8)
            {
                if(state==2)
                {
                    ROLL_L = (uint16_t)receivedData;
                    state++;
                    break;
                }
                else if(state==3)
                {
                    ROLL = ((uint16_t)receivedData<<8)|ROLL_L;
                    state++;
                    
                    break;
                }
                else if(state==4)
                {
                    PITCH_L = (uint16_t)receivedData;
                    state++;
                    break;
                }
                else if(state==5)
                {
                    PITCH = ((uint16_t)receivedData<<8)|PITCH_L;
                    state++;
                
                    break;
                }
                else if(state==6)
                {
                    YAW_L = (uint16_t)receivedData;
                    state++;
                    break;
                }
                else if(state==7)
                {
                    YAW = ((uint16_t)receivedData<<8)|YAW_L;
                    state++;
                    break;
                }
            }
        }
        
        else
        {
            switch(state)
            {
                case 0:
                if(receivedData==0x55)
                {
                    state++;
                }
                else state=0;
                break;
                case 1:
                if(receivedData==0x53)
                {
                    state++;
                }
                else state=0;
                break;
                case 8:
                state++;
                break;
                case 9:
                state++;
                break;
                case 10:
                
                state=0;
                break;
                default:break;
            }
        }
        break;
        default:
        break;
    }

}

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?? ? 说：

USART_SR和USART_DR寄存器

能描述一下这两个寄存器的作用吗？