DFSDM 入坑 – 如何验证录音内容

玩这个真是太少了,怎么验证对不对,因为是基于DISCO肯定是没问题,所以先试试分析逻辑,发现他把整个QSPI Flash当WAV文件看了.为了保证文件完整没BUG,我就用最高采样率,录满所有音频,然后等下保存下QSPI的内容,看看结果.
PS:实际上DISCO的例程有QSPI_STORAGE和RECORD_LOOPBACK两种,但是我们最终音频肯定要储存分析的.所以只能选QSPI_STORAGE,Flash大小是0xFA0000,因为型号是N25Q128,WAV头大小是44字节.然后DISCO的程序反正都是要全擦用来记文件,为什么是擦一下写一下,为什么不开机执行Mass Erase,搞不懂呢.虽然音频速度不快~
然后读取这么慢,可能是因为STM32是USB 1.1的,再加上还要走一段路才能回来.

然后发现开机就执行BSP_QSPI_Erase_Sector,移动一下这个函数位置,让他开机不要立马擦,不然怎么都dump不出数据.第二个坑,用STLINK竟然DUMP不出数据,提示cannot save hex/srec file to bin file,用命令行就没问题了.注意路径不能有空格,也不能太深,也不能太长文件名.什么鬼,说我76.7V了.STLINK好处是,官方板的外部loader都自带了.但是其实stlink速度感觉没jlink快.

不会的话就客户端然后用HEX2BIN软件也行.验证是可以听得...保存出来的确实是WAV.
因为上一节入坑已经分析了DFSDM的基本逻辑,现在分析QSPI的基本逻辑,他是怎么写数据进去的.之前就知道WAV有头,RIFF什么的.初始化时候就擦掉了0扇区,以便一开始就能录音.然后跳到AudioRecorder_Run->AudioRecorder_Start.初始化的结构体,还不知道音频文件多大.

  /* Initialize the WAV header */
  WavHeader.SampleRate     = RECORD_SAMPLE_RATE;
  WavHeader.NumChannels    = DEFAULT_AUDIO_IN_CHANNEL_NBR;
  WavHeader.BitsPerSample  = DEFAULT_AUDIO_IN_BIT_RESOLUTION;
  WavHeader.AudioLength    = 0;
  WavHeader.AudioStartAddr = WAV_HEADER_SIZE;
  WavHeader.RIFFchunksize  = WAV_HEADER_SIZE;
  WavHeader.FormatTag      = 1;
  WavHeader.ByteRate       = WavHeader.SampleRate * (WavHeader.BitsPerSample/8) * WavHeader.NumChannels;
  WavHeader.BlockAlign     = WavHeader.NumChannels * (WavHeader.BitsPerSample/8);
  WavHeader.DataSize       = 0;

但是会先把他编程进去,我就奇怪了,把Length填0,那么岂不是等下还要擦掉才能写长度?果然是这样的.

  /* Write the number of sample data ------------------------------------------*/
  /* This field will be overwritten at the end of the recording operation */
  WavHeaderBuffer[40]  = 0xFC;
  WavHeaderBuffer[41]  = 0x17;
  WavHeaderBuffer[42]  = 0x0A;
  WavHeaderBuffer[43]  = 0x00;

然后到AudioRecorder_Thread.每次都擦掉一下个块.

        if (   (BSP_QSPI_GetStatus() == QSPI_OK)
            && (hAudioRecorder.NextSectorToErase < QSPI_SECTOR_NB))
        {
          if (BSP_QSPI_Erase_Sector(hAudioRecorder.NextSectorToErase) != 0)
          {
            Error_Handler();
          }
          hAudioRecorder.NextSectorToErase++;
        }

结果如下:

  /* Read QSPI first sub-sector */
  if (BSP_QSPI_Read(hAudioRecorder.QspiSubSector, 0, QSPI_SUBSECTOR_SIZE) != QSPI_OK)
  {
    Error_Handler();
  }
  /* Update WAV header */
  hAudioRecorder.RecordTotalSize -= 8;
  pData = (uint32_t*)&hAudioRecorder.QspiSubSector[FILE_SIZE_OFFSET];
  *pData = hAudioRecorder.RecordTotalSize;
  hAudioRecorder.RecordTotalSize -= 44;
  pData = (uint32_t*)&hAudioRecorder.QspiSubSector[DATA_SIZE_OFFSET];
  *pData = hAudioRecorder.RecordTotalSize;
  /* Erase QSPI first sub-sector */
  if (BSP_QSPI_Erase_Block(0) != QSPI_OK)
  {
    Error_Handler();
  }
  /* Program QSPI first sub-sector */
  if (BSP_QSPI_Write(hAudioRecorder.QspiSubSector, 0, QSPI_SUBSECTOR_SIZE) != QSPI_OK)
  {
    Error_Handler();
  }