不进串口中断

1万 · 2011-6-28 19:56

断点设在串口发送中断里软仿真不停在断点上为什么

2万 · 2011-6-28 20:01

代码呢？

1万 · 2011-6-28 20:14

//******************************************************************************
// MSP430F21x2 Demo - USCI_A0, Ultra-Low Pwr UART 9600 String, 32kHz ACLK
//
// Description: This program demonstrates a full-duplex 9600-baud UART using
// USCI_A0 and a 32kHz crystal.  The program will wait in LPM3, and will
// respond to a received 'u' character using 8N1 protocol. The response will
// be the string 'Hello World'.
// ACLK = BRCLK = LFXT1 = 32768Hz, MCLK = SMCLK = DCO ~1.2MHz
// Baud rate divider with 32768Hz XTAL @9600 = 32768Hz/9600 = 3.41
// //* An external watch crystal is required on XIN XOUT for ACLK *//
//
//             MSP430F21x2
//          -----------------
//       /|\|             XIN|-
//       | |                | 32kHz
//       --|RST       XOUT|-
//          |                |
//          |    P3.4/UCA0TXD|------------>
//          |                | 9600 - 8N1
//          |    P3.5/UCA0RXD|<------------
//
// A. Dannenberg
// Texas Instruments Inc.
// October 2006
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include  "msp430x21x2.h"
const char string1[] = { "Hello World\r\n" };
unsigned int i;
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P1DIR = 0xFF;                            // All P1.x outputs
  P1OUT = 0;                               // All P1.x reset
  P2DIR = 0xFF;                            // All P2.x outputs
  P2OUT = 0;                               // All P2.x reset
  P3SEL = 0x30;                            // P3.4,5 = USCI_A0 TXD/RXD
  P3DIR = 0xFF;                            // All P3.x outputs
  P3OUT = 0;                               // All P3.x reset
  UCA0CTL1 |= UCSSEL_1;                   // CLK = ACLK
  UCA0BR0 = 0x03;                         // 32kHz/9600 = 3.41
  UCA0BR1 = 0x00;                         //
  UCA0MCTL = UCBRS1 + UCBRS0;             // Modulation UCBRSx = 3
  UCA0CTL1 &= ~UCSWRST;                   // **Initialize USCI state machine**
  IE2 |= UCA0RXIE;                         // Enable USCI_A0 RX interrupt
  __bis_SR_register(GIE);
  //__bis_SR_register(LPM3_bits + GIE);    // Enter LPM3 w/ int until Byte RXed
  IE2 |= UCA0TXIE;                      // Enable USCI_A0 TX interrupt
  UCA0TXBUF = string1[i++];
  while(1);
}
#pragma vector=USCIAB0TX_VECTOR
__interrupt void USCI0TX_ISR(void)
{
  UCA0TXBUF = string1[i++];                // TX next character//断点就设在这里怎么不进入呢我在main里已经从串口发东西了呀？
  if (i == sizeof string1 - 1)             // TX over?
IE2 &= ~UCA0TXIE;                      // Disable USCI_A0 TX interrupt
}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
  if (UCA0RXBUF == 'u')                   // 'u' received?
  {
i = 0;
IE2 |= UCA0TXIE;                      // Enable USCI_A0 TX interrupt
UCA0TXBUF = string1[i++];
  }
}