i2s_codec.c

STM32XXXX usb从设备和住设备的应用源代码

u32 GetVar_AudioPlayStatus(void)
{
  return AudioPlayStatus;
}

/*******************************************************************************
* Function Name  : SetVar_AudioPlayStatus
* Description    : Set the AudioDataIndex variable to Status.
* Input          : Status: could be AudioPlayStatus_STOPPED, AudioPlayStatus_PLAYING
*                :        or AudioPlayStatus_PAUSED.
* Output         : None
* Return         : AudioPlayStatus value.
*******************************************************************************/
u32 SetVar_AudioPlayStatus(u32 Status)
{
  AudioPlayStatus = (u32)Status;

  return AudioPlayStatus;
}

/*******************************************************************************
* Function Name  : GetVar_AudioReplay
* Description    : returns AudioReplay variable value.
* Input          : None
* Output         : None
* Return         : AudioReplay value.
*******************************************************************************/
u32 GetVar_AudioReplay(void)
{
  return AudioReplay;
}

/*******************************************************************************
* Function Name  : SetVar_AudioReplay
* Description    : Decrement the AudioReplayCount variable if AudioReplay is different
*                :  from zero (infinite replaying).
* Input          : None.
* Output         : None
* Return         : AudioPlayStatus value.
*******************************************************************************/
void Decrement_AudioReplay(void)
{
  if (AudioReplay != 0)
  {
    AudioReplayCount--;

    if (AudioReplayCount == 0)
    {
      /* Command the Stop of the audio playing */
      SetVar_AudioPlayStatus(AudioPlayStatus_STOPPED);

      /* Reset the counter */
      AudioReplayCount = AudioReplay;
    }
  }
}

/*******************************************************************************
* Function Name  : GetVar_CurrentOutputDevice
* Description    : Get the current output device selected .
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
u32 GetVar_CurrentOutputDevice(void)
{
  return CurrentOutputDevice;
}

/*******************************************************************************
* Function Name  : GetVar_AudioDataLength
* Description    : Get the current audio file data length .
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
u32 GetVar_AudioDataLength(void)
{
  return AudioDataLength;
}

/*******************************************************************************
* Function Name  : GetVar_i2saudiofreq
* Description    : Get the current audio frequency .
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
u16 GetVar_i2saudiofreq(void)
{
  return i2saudiofreq;
}

/*******************************************************************************
* Function Name  : AudioFile_Init
* Description    : Initializes the SPI_Flsh and returns the Wavadatalength variable.
* Input          : None
* Output         : None
* Return         : - The length of the wave file read from the SPI_Flash
*                  - 1 if an error occured when initializing the memory.
*                  - 2 if an error occured on the audio file intialization.
*******************************************************************************/
u32 AudioFile_Init(void)
{
  u32 err = 0;

  /* Initialize the media support */
  err = Media_Init();

  /* Check if Memory initialization is OK */
  if (err != 0)
  {
    return 1;
  }

  /* Read a Byte buffer and store it in the Header table*/
  Media_BufferRead(AudioFileHeader, AudioFileAddress, HEADER_SIZE);

  /* Read and check the audio file Header */
  WaveFileStatus = I2S_CODEC_WaveParsing(AudioFileHeader);

  /* Check if the selected file is a correct wave file */
  if (WaveFileStatus == Valid_WAVE_File)
  {
    /* Read and set the audio data length (/!\ data are counted as BYTES /!\) */
    AudioDataLength = WAVE_Format.DataSize ;

    /* Read and set the audio frequency */
    i2saudiofreq = (u16)WAVE_Format.SampleRate;

    /* Return the audio file length */
    return AudioDataLength;
  }
  else /* Wrong wave file */
  {
    return 2;
  }
}

/*******************************************************************************
* Function Name  : NVIC_Config
* Description    : Configure the I2Ss NVIC channel.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
static void NVIC_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* SPI2 IRQ Channel configuration */
  NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/*******************************************************************************
* Function Name  : GPIO_Config
* Description    : Initializes the GPIO pins used by the codec application.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void I2S_GPIO_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable GPIOB, GPIOC and AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOG |
                         RCC_APB2Periph_GPIOF | RCC_APB2Periph_AFIO, ENABLE);

  /* I2S2 SD, CK and WS pins configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* I2S2 MCK pin configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* LEDs pins configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOF, &GPIO_InitStructure);

  /* I2C1 SCL PB6 and SDA PB7 pins configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Enable the I2C1 APB1 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

  /* Turn Off All LEDs */
  GPIO_ResetBits(GPIOF, GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9);
  GPIO_ResetBits(Codec_PDN_GPIO, Codec_PDN_Pin);

  /* Configure the Codec PDN pin as output PushPull */
  GPIO_InitStructure.GPIO_Pin = Codec_PDN_Pin;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(Codec_PDN_GPIO, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : I2S_Config
* Description    : Configure the I2S Peripheral.
* Input          :  - Standard: I2S_Standard_Phillips, I2S_Standard_MSB or I2S_Standard_LSB
*                   - MCLKOutput: I2S_MCLKOutput_Enable or I2S_MCLKOutput_Disable
*                   - AudioFreq: I2S_AudioFreq_8K, I2S_AudioFreq_16K, I2S_AudioFreq_22K,
*                                I2S_AudioFreq_44K or I2S_AudioFreq_48K
* Output         : None
* Return         : None
*******************************************************************************/
void I2S_Config(u16 Standard, u16 MCLKOutput, u16 AudioFreq)
{
  I2S_InitTypeDef I2S_InitStructure;

  /* Enable I2S2 APB1 clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  /* Deinitialize SPI2 peripheral */
  SPI_I2S_DeInit(SPI2);

  /* I2S2 peripheral configuration */
  I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
  I2S_InitStructure.I2S_Standard = Standard;
  I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
  I2S_InitStructure.I2S_MCLKOutput = MCLKOutput;
  I2S_InitStructure.I2S_AudioFreq = AudioFreq;
  I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
  I2S_Init(SPI2, &I2S_InitStructure);

  /* Disable the I2S2 TXE Interrupt */
  SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, DISABLE);

  /* Enable the SPI2/I2S2 peripheral */
  I2S_Cmd(SPI2, ENABLE);
}

/*******************************************************************************
* Function Name  : I2C_Config
* Description    : Configure the I2C1 Peripheral.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
static void I2C_Config(void)
{
  I2C_InitTypeDef I2C_InitStructure;

  /* I2C1 configuration */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = 0x33;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = 200000;
  I2C_Init(I2C1, &I2C_InitStructure);
}

/*******************************************************************************
* Function Name  : CODEC_Config
* Description    : Configure the Codec in Headphone mode.
* Input          :  - OutputDevice: OutputDeviceHEADPHONE or OutputDeviceSPEAKER
*                :  - I2S_Standard: I2S communication standard could be I2S_Standard_Phillips
*                :       I2S_Standard_MSB or I2S_Standard_LSB.
*                :  - I2S_MCLKOutput: could be I2S_MCLKOutput_
*                :  - Volume:
* Output         : None
* Return         : 0-> correct communication, else wrong communication
*******************************************************************************/
u32 CODEC_Config(u16 OutputDevice, u16 I2S_Standard, u16 I2S_MCLKOutput, u8 Volume)
{
  u32 Standard = 0, counter = 0, PLLMode = 0;

  /* Command the sending of dummy data */
  ResetVar_SendDummyData();

  /* Reset the Codec Registers */
  I2S_CODEC_Reset();

  /* Determine the I2S standard used */
  switch (I2S_Standard)
  {
    case I2S_Standard_Phillips:
      Standard = 0x03;
      break;
    case I2S_Standard_MSB:
      Standard = 0x02;
      break;
    default :
      Standard = 0x01;
      break;
  }

  /* HEADPHONE codec configuration */
  if ((OutputDevice & OutputDevice_HEADPHONE) != 0)
  {
    /* PLL Slave SD/WS reference mode ----------------------*/
    if (I2S_MCLKOutput == I2S_MCLKOutput_Disable)
    {
      /* set the PLLMode variable */
      PLLMode = 0x1;

      /* Phillips(0x03)/MSB(0x02)/LSB(0x01) mode with PLL */
      counter += CODEC_WriteRegister(0x04, (Standard | 0x20));
      /* MCKI input frequency = 256.Fs */
      counter += CODEC_WriteRegister(0x05, 0x03);
      /* VCOM Power up (PMVCM bit)*/
      counter += CODEC_WriteRegister(0x00, 0x40);
      /* Enable PLL*/
      counter += CODEC_WriteRegister(0x01, 0x01);
    }
    /* Ext Slave mode with no PLL --------------------------*/
    else
    {
      /* Reset the PLL mode variable */
      PLLMode = 0;

      /* Phillips(0x03)/MSB(0x02)/LSB(0x01) mode with no PLL */
      counter += CODEC_WriteRegister(0x04, Standard);
      /* MCKI input frequency = 256.Fs */
      counter += CODEC_WriteRegister(0x05, 0x00);
      /* VCOM Power up (PMVCM bit)*/
      counter += CODEC_WriteRegister(0x00, 0x40);
    }

    /* Command the sending of dummy data */
    SetVar_SendDummyData();

    /* Enable the I2S2 TXE Interrupt  => Generate the clocks*/
    SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, ENABLE);

    /* Extra Configuration (of the ALC) */
    counter += CODEC_WriteRegister(0x06, 0x3C );
    counter += CODEC_WriteRegister(0x08, 0xE1 );
    counter += CODEC_WriteRegister(0x0B, 0x00 );
    counter += CODEC_WriteRegister(0x07, 0x20 );
    counter += CODEC_WriteRegister(0x09, 0xC1 );
    counter += CODEC_WriteRegister(0x0C, 0xC1 );

    /* MCKI is 256.Fs with no PLL */
    counter += CODEC_WriteRegister(0x05, 0x00 );
    /* Switch control from DAC to Headphone */
    counter += CODEC_WriteRegister(0x0F, 0x09 );
    /* Bass Boost and Demphasis enable */
    counter += CODEC_WriteRegister(0x0E, 0x18 );
    /* Left Channel Digital Volume control */
    counter += CODEC_WriteRegister(0x0A, Volume);
    /* Right Channel Digital Volume control */
    counter += CODEC_WriteRegister(0x0D, Volume);
    /* Power up MIN and DAC (PMMIN and PMDAC bits)*/
    counter += CODEC_WriteRegister(0x00, 0x74);
    /* Enable Slave mode and Left/Right HP lines*/
    counter += CODEC_WriteRegister(0x01, (0x30 | PLLMode));
    /* Exit HP mute mode */
    counter += CODEC_WriteRegister(0x01, (0x70 | PLLMode));
  }

  /* SPEAKER codec configuration */
  if ((OutputDevice & OutputDevice_SPEAKER) != 0)
  {
    /* PLL Slave SD/WS reference mode ----------------------*/
    if (I2S_MCLKOutput == I2S_MCLKOutput_Disable)
    {
      /* Phillips(0x03)/MSB(0x02)/LSB(0x01) mode with no PLL */
      counter += CODEC_WriteRegister(0x04, (Standard | 0x20));
      /* MCKI input frequency = 256.Fs */
      counter += CODEC_WriteRegister(0x05, 0x03);
      /* VCOM Power up (PMVCM bit)*/
      counter += CODEC_WriteRegister(0x00, 0x40);
      /* Enable PLL*/
      counter += CODEC_WriteRegister(0x01, 0x01);
    }
    /* Ext Slave mode with no PLL --------------------------*/
    else
    {
      /* Phillips(0x03)/MSB(0x02)/LSB(0x01) mode with no PLL */
      counter += CODEC_WriteRegister(0x04, Standard);
      /* MCKI input frequency = 256.Fs */
      counter += CODEC_WriteRegister(0x05, 0x00);
      /* VCOM Power up (PMVCM bit)*/
      counter += CODEC_WriteRegister(0x00, 0x40);
    }