波特率限制问题

只看该作者 · 2014-6-22 23:38

为啥我下载example里的msp430g2xx3_uscia0_uart_01_9600是正常的
msp430g2xx3_uscia0_uart_01_19200缺有部分收发错误

只看该作者 · 2014-6-22 23:39

#include  "msp430g2553.h"

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  BCSCTL1 = CALBC1_1MHZ;                   // Set DCO
  DCOCTL = CALDCO_1MHZ;
  P1SEL = BIT1 + BIT2 ;                   // P1.1 = RXD, P1.2=TXD
  P1SEL2 = BIT1 + BIT2 ;                   // P1.1 = RXD, P1.2=TXD
  UCA0CTL1 |= UCSSEL_2;                   // SMCLK
  UCA0BR0 = 52;                            // 1MHz 19200
  UCA0BR1 = 0;                            // 1MHz 19200
  UCA0MCTL = UCBRS0;                      // Modulation UCBRSx = 1
  UCA0CTL1 &= ~UCSWRST;                   // **Initialize USCI state machine**
  IE2 |= UCA0RXIE;                         // Enable USCI_A0 RX interrupt

  __bis_SR_register(LPM0_bits + GIE);    // Enter LPM0, interrupts enabled
}

// Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
  while (!(IFG2 & UCA0TXIFG));             // USCI_A0 TX buffer ready?
  UCA0TXBUF = UCA0RXBUF;                   // TX -> RXed character
}

波特率限制问题

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