MSP430: Serial Output

initialization

 1 void Uart_Init(void)

 2 {

 3       BCSCTL1 = CALBC1_1MHZ;                    // Set DCO

 4       DCOCTL = CALDCO_1MHZ;

 5       P1SEL = BIT1 + BIT2 ;                     // P1.1 = RXD, P1.2=TXD

 6       P1SEL2 = BIT1 + BIT2 ;                    // P1.1 = RXD, P1.2=TXD

 7       UCA0CTL1 |= UCSSEL_2;                     // SMCLK

 8       UCA0BR0 = 104;                            // 1MHz 9600

 9       UCA0BR1 = 0;                              // 1MHz 9600

10       UCA0MCTL = UCBRS0;                        // Modulation UCBRSx = 1

11       UCA0CTL1 &= ~UCSWRST;                     // **Initialize USCI state machine**

12       IE2 |= UCA0RXIE;                          // Enable USCI_A0 RX interrupt

13 }

1 //  Echo back RXed character, confirm TX buffer is ready first

2 #pragma vector=USCIAB0RX_VECTOR

3 __interrupt void USCI0RX_ISR(void)

4 {

5   while (!(IFG2&UCA0TXIFG));                // USCI_A0 TX buffer ready?

6   UCA0TXBUF = UCA0RXBUF;                   // TX -> RXed character

7 }

 1 //Send data

 2 //Send character

 3 void uart_send_ch(unsigned char ch)

 4 {

 5 

 6 while(!(IFG2& UCA0TXIFG)); //Check whether the sending is finished

 7     UCA0TXBUF = ch;

 8 IFG2&=~UCA0TXIFG; //Clear the send flag

 9 }

10 

11 //Send string

12 void uart_send_str(char *str)

13 {

14       for( ; *str ; )

15       {

16           uart_send_ch((unsigned char)*str);

17           str++;

18       }

19 }

 When sending a number combination using uart_send_str() and then sending a carriage return, garbled characters will appear, about nine characters will appear, and the problem can be solved by delaying in the middle

 char a[4];  

 uart_send_str(a);

 __delay_cycles(5);  

uart_send_hook();

void uart_send_huiche(void)

{

    uart_send_ch(0x0d);

    uart_send_ch(0x0a);

}