MSP430F247串口通信调试问题

ke luo

串口调试过程中，在接收函数中设置断点，通过串口调试助手发送但直接响应断点，发送多个字节，只有最后一个字节响应断点，这是什么问题？中断响应不是一帧有多少个字节就响应多少次中断吗？还是我设置的问题。程序的设置如下：

时间设置为内部DCO 8M:

WDTCTL = WDTPW + WDTHOLD; //关闭看门口
BCSCTL1 = CALBC1_8MHZ;
DCOCTL = CALDCO_8MHZ;
BCSCTL2 |= SELM_2 + SELS; //MCLK = SMCLK = XT2

串口0初始化：

void initTR0(void) //串口A0为232接口，读取测距机数据
{
P3SEL |= 0xF0; // P3.4,5 = USART0 TXD/RXD
UCA0CTL1 |= UCSSEL_2; //串口时钟选择SMCLK
UCA0BR0 = 0xA0; //8M/19200 417 ,地位
UCA0BR1 = 0x01; //高位
UCA0MCTL = UCBRS0; //修正值
UCA0CTL1 &= ~UCSWRST; //Initialize USART state machine
UC0IE |= UCA0RXIE; //开启串口0接收中断
}

串口接收中断响应：

#pragma vector=USCIAB0RX_VECTOR
__interrupt void usart0_rx (void)
{
//while(!(IFG2 & UCA0TXIFG)); //USCI_A0 发送寄存器准备好了？
//UCA0TXBUF = UCA0RXBUF; // 发送寄存器将接收的数据发送出去

if(Flag == 0)
{
if(UCA0RXBUF == 0x44) //判断是帧头读取数据
{
laserData[0] = UCA0RXBUF;
Flag = 1;
m = 1;
}
}
else
{
laserData[m] = UCA0RXBUF;
m++;
if(12 == m)
{
Flag = 0;
m = 0;
}
}
}

在主程序中开总中断：

_EINT(); //开总中断

5 年多前

0 Susan Yang 5 年多前

TI__Guru**** 252096 points

您可以直接使用TI的例程

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 *                       MSP430 CODE EXAMPLE DISCLAIMER
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 * concise manner. For this the code may rely on the device's power-on default
 * register values and settings such as the clock configuration and care must
 * be taken when combining code from several examples to avoid potential side
 * effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
 * for an API functional library-approach to peripheral configuration.
 *
 * --/COPYRIGHT--*/
//******************************************************************************
//   MSP430x24x Demo - USCI_A0, 19200 UART Echo ISR, DCO SMCLK
//
//   Description: Echo a received character, RX ISR used. Normal mode is LPM0.
//   USCI_A0 RX interrupt triggers TX Echo.
//   Baud rate divider with 1MHz = 1MHz/19200 = ~52.1
//   ACLK = n/a, MCLK = SMCLK = CALxxx_1MHZ = 1MHz
//
//                MSP430F249
//             -----------------
//         /|\|              XIN|-
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |     P3.4/UCA0TXD|------------>
//            |                 | 19200 - 8N1
//            |     P3.5/UCA0RXD|<------------
//
//  B. Nisarga
//  Texas Instruments Inc.
//  September 2007
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.42A
//******************************************************************************
#include <msp430.h>

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  if (CALBC1_1MHZ==0xFF)					// If calibration constant erased
  {											
    while(1);                               // do not load, trap CPU!!	
  } 
  DCOCTL = 0;                               // Select lowest DCOx and MODx settings
  BCSCTL1 = CALBC1_1MHZ;                    // Set DCO
  DCOCTL = CALDCO_1MHZ;
  P3SEL = 0x30;                             // P3.4,5 = USCI_A0 TXD/RXD
  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
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCIAB0RX_VECTOR))) USCI0RX_ISR (void)
#else
#error Compiler not supported!
#endif
{
  while (!(IFG2 & UCA0TXIFG));              // USCI_A0 TX buffer ready?
  UCA0TXBUF = UCA0RXBUF;                    // TX -> RXed character
}

0 灰小子 5 年多前

Guru 67475 points

如果只是用到串口中断，一般是一个字节产生一次中断。

建议楼主先运行一下例程，看是否正常

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MSP430F247串口通信调试问题