msp430f5529uart通信读取UCA1RXBUF缓冲区的字符串

以下是一个示例代码，用于 MSP430F5529 上的 UART 通信读取 UCA1RXBUF 缓冲区的字符串：

#include <msp430.h>

void UART_init(void);
void UART_sendChar(unsigned char c);
void UART_sendString(char *str);
void UART_receiveString(char *str);

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

    UART_init();                // Initialize UART

    char received_string[20];   // Create a buffer to hold the received string

    while (1)
    {
        UART_receiveString(received_string);    // Receive the string from UART
        UART_sendString(received_string);       // Send the received string back through UART
    }
}

void UART_init(void)
{
    P4SEL |= BIT4+BIT5;         // Assign UART pins to P4.4 and P4.5
    UCA1CTL1 |= UCSWRST;        // Enable software reset
    UCA1CTL1 |= UCSSEL_2;       // SMCLK as clock source
    UCA1BR0 = 104;              // Baud rate = SMCLK / 104 = 9600
    UCA1BR1 = 0;
    UCA1MCTL |= UCBRS_1 + UCBRF_0;   // Modulation UCBRSx=1, UCBRFx=0
    UCA1CTL1 &= ~UCSWRST;       // Disable software reset
}

void UART_sendChar(unsigned char c)
{
    while (!(UCA1IFG & UCTXIFG));   // Wait until TX buffer is ready
    UCA1TXBUF = c;                  // Send character through UART
}

void UART_sendString(char *str)
{
    while (*str)
    {
        UART_sendChar(*str++);
    }
}

void UART_receiveString(char *str)
{
    int i = 0;                  // Initialize counter
    char c = '\0';              // Initialize character

    while (c != '\r')           // Read until carriage return is received
    {
        while (!(UCA1IFG & UCRXIFG));    // Wait until RX buffer is ready
        c = UCA1RXBUF;                  // Read character from UART

        if (c == '\r')                  // If carriage return is received, terminate the string
        {
            *str = '\0';
        }
        else                            // Otherwise, add the character to the string
        {
            *str++ = c;
        }

        i++;                            // Increment counter
    }
}

在上面的代码中，我们首先初始化了 UART，然后创建了一个缓冲区 received_string 来存储接收到的字符串。在 main 函数中，我们使用一个无限循环来持续接收和发送字符串。在 UART_receiveString 函数中，我们使用一个循环来读取缓冲区中的字符，直到接收到回车符为止，然后将其添加到字符串中。最后，在 UART_sendString 函数中，我们使用一个循环来发送字符串中的每个字符