串口丢失字节

PC通过串口接收协调器的数据时，第一组数据是正确的，从第二组数据开始以后接收到的每次都少一个字节，而且这个字节是第二个字节。

1：把从无线接收到的数据发送到串口

case AF_INCOMING_MSG_CMD：         

         simpleApp_ProcessMSGCmd( MSGpkt );

2：把从上位机串口接收到的数据发送到协调器，用的回调函数rxCB（）。串口设置如下：

 halUARTCfg_t uartConfig;
  uartConfig.configured           = TRUE;              // 2x30 don't care - see uart driver.
  uartConfig.baudRate             = SERIAL_APP_BAUD;
  uartConfig.flowControl          = FALSE;
  uartConfig.flowControlThreshold = SERIAL_APP_THRESH; // 2x30 don't care - see uart driver.
  uartConfig.rx.maxBufSize        = SERIAL_APP_RX_SZ;  // 2x30 don't care - see uart driver.
  uartConfig.tx.maxBufSize        = SERIAL_APP_TX_SZ;  // 2x30 don't care - see uart driver.
  uartConfig.idleTimeout          = SERIAL_APP_IDLE;   // 2x30 don't care - see uart driver.
  uartConfig.intEnable            = TRUE;              // 2x30 don't care - see uart driver.
  uartConfig.callBackFunc         = rxCB;   //MT_UartProcessZToolData
  HalUARTOpen (0, &uartConfig);

回调函数如下：

static void rxCB(uint8 port, uint8 event)
{
  uint8 *buf, len;
  if (!(buf = osal_mem_alloc(SERIAL_RX_CNT))) return;
  /* HAL UART Manager will turn flow control back on if it can after read.
   * Reserve 1 byte for the 'sequence number'.*/
  len = HalUARTRead(0,buf,SERIAL_RX_CNT);
  HalUARTWrite(0,buf,len);
  if(!len)
  { // Length is not expected to ever be zero.
    osal_mem_free( buf );
    return;
  }
  otaBuf = buf;
  otalen = len;
  osal_set_event(LocDongle_TaskID, SERIAL_PORT_MSG_DATA_EVT);
}