BLE 4.0UART接收该位DMA 单次块传输，只能重复收到第一个长度字节是怎么回事》

各位，我的DMA配置如下：

ch = HAL_DMA_GET_DESC1234( HAL_DMA_CH_RX );

  // Abort any pending DMA operations (in case of a soft reset).
  HAL_DMA_ABORT_CH( HAL_DMA_CH_RX );

  // The start address of the source.
  HAL_DMA_SET_SOURCE( ch, DMA_UxDBUF );

  // Using the length field to determine how many bytes to transfer.
  HAL_DMA_SET_VLEN( ch, HAL_DMA_VLEN_1_P_VALOFFIRST );//第一个字节作为接收长度，长度字节不计入接收计数

  /* The trick is to cfg DMA to xfer 2 bytes for every 1 byte of Rx.
   * The byte after the Rx Data Buffer is the Baud Cfg Register,
   * which always has a known value. So init Rx buffer to inverse of that
   * known value. DMA word xfer will flip the bytes, so every valid Rx byte
   * in the Rx buffer will be preceded by a DMA_PAD char equal to the
   * Baud Cfg Register value.
   */
  HAL_DMA_SET_WORD_SIZE( ch, HAL_DMA_WORDSIZE_BYTE );//按照字节接收

  // The bytes are transferred 1-by-1 on Rx Complete trigger.
  HAL_DMA_SET_TRIG_MODE( ch, HAL_DMA_TMODE_BLOCK );//块传输
  HAL_DMA_SET_TRIG_SRC( ch, DMATRIG_RX );

  // The source address is constant - the Rx Data Buffer.
  HAL_DMA_SET_SRC_INC( ch, HAL_DMA_SRCINC_0 );

  // The destination address is incremented by 1 word after each transfer.
  HAL_DMA_SET_DST_INC( ch, HAL_DMA_DSTINC_1 );
 
  HAL_DMA_SET_DEST( ch, dmaCfg.rxBuf );//tempbuf
  //
  HAL_DMA_SET_LEN( ch, HAL_UART_DMA_RX_MAX );//这个我设置为160

  // The DMA is to be polled and shall not issue an IRQ upon completion.
  HAL_DMA_SET_IRQ( ch, HAL_DMA_IRQMASK_ENABLE );//HAL_DMA_IRQMASK_DISABLE//HAL_DMA_IRQMASK_ENABLE
  DMAIE =1;
  // Xfer all 8 bits of a byte xfer.
  HAL_DMA_SET_M8( ch, HAL_DMA_M8_USE_8_BITS );

  // DMA has highest priority for memory access.
  HAL_DMA_SET_PRIORITY( ch, HAL_DMA_PRI_HIGH);

从另外一台机器发送字节0B +11个字节

DMA发生接收中断，收到12个字节的0B，请问是怎么回事，DMA块中断应该怎么应用？

帮忙顶一下，求解！