MSP5308 定时器模拟串口

这个网上资料很多，比如：http://wenku.baidu.com/view/385c312de2bd960590c677b5.html  MSP430架构类似，稍作修改即可使用

其他MSP430F5308模块示例代码：http://www.ti.com/lit/zip/slac469

非常谢谢你，G2xx1的例子修改后在f5308上运行有一个问题，这个问题是：模拟串口发送的第一个字符串是错的，后面发送的字符串都是对的，这是为什么啊？

非常谢谢你，G2xx1的例子修改后在f5308上运行有一个问题， 这个问题是：模拟串口发送的第一个字符串是错的，后面发送的字符串都是对的，这是为什么啊？

Hi Haiming,

   方便的话，你可以把你的程序上传一下吗？这样分析起来会更方便快捷一些。

谢谢

ken

只有第一帧是错的，后面是对的，谢谢，程序附上：

void TimerA_UART_init(void)
{
    TA0CTL = TASSEL_2 + MC_2;                // SMCLK, start in continuous mode
   
    TA0CCTL0 = OUT;                          // Set TXD Idle as Mark = '1' 
    TA0CCTL1 = SCS + CM1 + CAP + CCIE;       // Sync, Neg Edge, Capture, Int
  
}

//------------------------------------------------------------------------------
// Prints a string over using the Timer_A UART
//------------------------------------------------------------------------------
void Tx_array(unsigned char *array, int CNT)
{
  int i=0;
  for(i=0;i<CNT;i++)
  {
    Tx_byte(array+i);
  }

}

//------------------------------------------------------------------------------
// Outputs one byte using the Timer_A UART
//------------------------------------------------------------------------------
void Tx_byte(unsigned char *pointer)
{
    while (TA0CCTL0 & CCIE);                 // Ensure last char got TX'd
    TA0CCR0 = TA0R;                           // Current state of TA counter
    TA0CCR0 += UART_TBIT;                    // One bit time till first bit
    TA0CCTL0 = OUTMOD0 + CCIE;               // Set TXD on EQU0, Int
    txData = *pointer;                          // Load global variable
    txData |= 0x100;                        // Add mark stop bit to TXData
    txData <<= 1;                           // Add space start bit
  
}

//------------------------------------------------------------------------------
// Timer_A UART - Transmit Interrupt Handler
//------------------------------------------------------------------------------
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer0_A0_ISR(void)
{
    static unsigned char txBitCnt = 10;

    TA0CCR0 += UART_TBIT;                    // Add Offset to CCRx
    if (txBitCnt == 0) {                    // All bits TXed?
        TA0CCTL0 &= ~CCIE;                    // All bits TXed, disable interrupt
        txBitCnt = 10;                      // Re-load bit counter
    }
    else {
        if (txData & 0x01) {
          TA0CCTL0 &= ~OUTMOD2;              // TX Mark '1'
        }
        else {
          TA0CCTL0 |= OUTMOD2;               // TX Space '0'
        }
        txData >>= 1;
        txBitCnt--;
    }
   

  
}     
//------------------------------------------------------------------------------
// Timer_A UART - Receive Interrupt Handler
//------------------------------------------------------------------------------
#pragma vector = TIMER0_A1_VECTOR
__interrupt void Timer0_A1_ISR(void)
{
    static unsigned char rxBitCnt = 8;
    static unsigned char rxData = 0;

    switch (__even_in_range(TA0IV, TA0IV_TA0IFG)) { // Use calculated branching
        case TA0IV_TA0CCR1:                        // TACCR1 CCIFG - UART RX
            TA0CCR1 += UART_TBIT;                 // Add Offset to CCRx
            if (TA0CCTL1 & CAP) {                 // Capture mode = start bit edge
                TA0CCTL1 &= ~CAP;                 // Switch capture to compare mode
                TA0CCR1 += UART_TBIT_DIV_2;       // Point CCRx to middle of D0
            }
            else {
                rxData >>= 1;
                if (TA0CCTL1 & SCCI) {            // Get bit waiting in receive latch
                    rxData |= 0x80;
                }
                rxBitCnt--;
                if (rxBitCnt == 0) {             // All bits RXed?
                 

                  RX_DATA[RX_PW++] = rxData;         
                  if (RX_PW >= RXDATA_SIZE)   
                  { 
                    RX_PW = 0;
                  } 
                   
                    rxBitCnt = 8;                // Re-load bit counter
                    TA0CCTL1 |= CAP;              // Switch compare to capture mode
                  
                }
            }
            break;
    }
}

接收没有问题，发送的第一帧会出错。