i2s_codec.c

STM32XXXX usb从设备和住设备的应用源代码

    /* 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);

    /* ReSelect the MCKI frequency (FS0-1 bits): 256.Fs */
    counter += CODEC_WriteRegister(0x05, 0x02 );
    /* Set up the path "DAC->Speaker-Amp" with no power save (DACS and SPPSN bits) */
    counter += CODEC_WriteRegister(0x02, 0x20 );
    /* Speaker Gain (SPKG0-1 bits): Gain=+10.65dB(ALC off)/+12.65(ALC on) */
    counter += CODEC_WriteRegister(0x03, 0x10);

    /* 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, 0x91 );
    counter += CODEC_WriteRegister(0x0C, 0x91 );

    /* Left Channel Digital Volume control */
    counter += CODEC_WriteRegister(0x0A, Volume);
    /* Right Channel Digital Volume control */
    counter += CODEC_WriteRegister(0x0D, Volume);
    /* Power up Speaker and DAC (PMSPK and PMDAC bits)*/
    counter += CODEC_WriteRegister(0x00, 0x54);
    /* Set up the path "DAC -> Speaker-Amp" with no power save */
    counter += CODEC_WriteRegister(0x02, 0xA0 /*0xA1*/);
  }

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

  /* Disable the sending of Dummy data */
  ResetVar_SendDummyData();

  /* Return the counter value */
  return counter;
}

/*******************************************************************************
* Function Name  : CODEC_WriteRegister
* Description    : Writes a value in a register of the audio Codec through I2C.
* Input          :  - RegisterAddr: The target register adress (between 00x and 0x24)
*                :  - RegisterValue: The target register value to be written
*                :  - Verify: 0-> Don't verify the written data, 1-> Verify the written data
* Output         : None
* Return         : - 0  -> Correct write operation
*                : - !0 -> Incorrect write operation
*******************************************************************************/
u32 CODEC_WriteRegister(u32 RegisterAddr, u32 RegisterValue)
{
  u32 read_verif = 0;

  /* Reset all I2C2 registers */
  I2C_SoftwareResetCmd(I2C1, ENABLE);
  I2C_SoftwareResetCmd(I2C1, DISABLE);

  /* Enable the I2C1 peripheral  */
  I2C_Cmd(I2C1, ENABLE);

  /* Configure the I2C peripheral */
  I2C_Config();

  /* Begin the config sequence */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on EV5 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
  {}
  /* Transmit the slave address and enable writing operation */
  I2C_Send7bitAddress(I2C1, CODEC_ADDRESS, I2C_Direction_Transmitter);

  /* Test on EV6 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {}
  /* Transmit the first address for r/w operations */
  I2C_SendData(I2C1, RegisterAddr);

  /* Test on EV8 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {}

  /* Prepare the register value to be sent */
  I2C_SendData(I2C1, RegisterValue);

  /* Test on EV8 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {}

  /* End the configuration sequence */
  I2C_GenerateSTOP(I2C1, ENABLE);

  /* Verify (if needed) that the loaded data is correct  */
#ifdef VERIFY_WRITTENDATA
  /* Read the just written register*/
  read_verif = CODEC_ReadRegister(RegisterAddr);

  /* Load the register and verify its value  */
  if (read_verif != RegisterValue)
  {
    /* Control data wrongly tranfered */
    read_verif = 1;
  }
  else
  {
    /* Control data correctly transfered */
    read_verif = 0;
  }
#endif

  /* Return the verifying value: 0 (Passed) or 1 (Failed) */
  return read_verif;
}

/*******************************************************************************
* Function Name  : CODEC_ReadRegister
* Description    : Reads a register of the audio Codec through I2C.
* Input          :  - RegisterAddr: The target register adress (between 00x and 0x24)
* Output         : None
* Return         : The value of the read register
*******************************************************************************/
u32 CODEC_ReadRegister(u32 RegisterAddr)
{
  u32 tmp = 0;

  /* Disable the I2C1 peripheral  */
  I2C_Cmd(I2C1, DISABLE);

  /* Reset all I2C2 registers */
  I2C_SoftwareResetCmd(I2C1, ENABLE);
  I2C_SoftwareResetCmd(I2C1, DISABLE);

  /* Configure the I2C peripheral */
  I2C_Config();

  /* Enable the I2C peripheral */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on EV5 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
  {}

  /* Disable Acknowledgement */
  I2C_AcknowledgeConfig(I2C1, DISABLE);

  /* Transmit the slave address and enable writing operation */
  I2C_Send7bitAddress(I2C1, CODEC_ADDRESS, I2C_Direction_Transmitter);

  /* Test on EV6 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {}

  /* Transmit the first address for r/w operations */
  I2C_SendData(I2C1, RegisterAddr);

  /* Test on EV8 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {}

  /* Regenerate a start condition */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on EV5 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
  {}

  /* Transmit the slave address and enable writing operation */
  I2C_Send7bitAddress(I2C1, CODEC_ADDRESS, I2C_Direction_Receiver);

  /* Test on EV6 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
  {}

  /* Test on EV7 and clear it */
  while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
  {}

  /* End the configuration sequence */
  I2C_GenerateSTOP(I2C1, ENABLE);

  /* Load the register value */
  tmp = I2C_ReceiveData(I2C1);

  /* Disable Acknowledgement */
  I2C_AcknowledgeConfig(I2C1, ENABLE);

  /* Return the read value */
  return tmp;
}

/*******************************************************************************
* Function Name  : ReadUnit
* Description    : Reads a number of bytes from the SPI Flash and reorder them
*                  in Big or little endian.
* Input          : - NbrOfBytes : number of bytes to read.
*                    This parameter must be a number between 1 and 4.
*                  - ReadAddr : external memory address to read from.
*                  - Endians : specifies the bytes endianness.
*                    This parameter can be one of the following values:
*                          - LittleEndian
*                          - BigEndian
* Output         : None
* Return         : Bytes read from the SPI Flash.
*******************************************************************************/
static u32 ReadUnit(u8 NbrOfBytes, Endianness BytesFormat)
{
  u32 index = 0;
  u32 Temp = 0;

  if (BytesFormat == LittleEndian)
  {
    for (index = 0; index < NbrOfBytes; index++)
    {
      Temp |= AudioFileHeader[HeaderTabIndex++] << (index * 8);
    }
  }
  else
  {
    for (index = NbrOfBytes; index != 0; index--)
    {
      Temp |= AudioFileHeader[HeaderTabIndex++] << ((index - 1) * 8);
    }
  }

  return Temp;
}

/*******************************************************************************
* Function Name  : I2S_CODEC_MediaReadHalfWord
* Description    : Read one half word from the media (SPI_Flash/NOR/NAND memories..)
* Input          : - Offset: the adress offset for read operation
* Output         : None.
* Return         : Data read from the media memory.
*******************************************************************************/
u16 Media_ReadHalfWord(u32 Offset)
{
  /* Test if the left channel is to be sent */
  if (monovar == 0)
  {
    /* Enable the FSMC that share a pin w/ I2C1 (LBAR) */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

    tmpvar =  (*(vu16 *) (AudioFileAddress + Offset));

    /* Disable the FSMC that share a pin w/ I2C1 (LBAR) */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, DISABLE);

    /* Increment the mono variable only if the file is in mono format */
    if (WAVE_Format.NumChannels == Channel_MONO)
    {
      /* Increment the monovar variable */
      monovar++;
    }

    /* Return the read value */
    return tmpvar;
  }
  /* Right channel to be sent in mono format */
  else
  {
    /* Reset the monovar variable */
    monovar = 0;

    /* Return the previous read data in mono format */
    return tmpvar;
  }
}

/*******************************************************************************
* Function Name  : I2S_CODEC_MediaReadByte
* Description    : Read one byte from the media (SPI_Flash/NOR/NAND memories..)
* Input          : - Offset: the adress offset for read operation
* Output         : None.
* Return         : Data read from the media memory.
*******************************************************************************/
u8 Media_ReadByte(u32 Offset)
{
  u8 tmp = 0;

  /* Enable the FSMC that share a pin w/ I2C1 (LBAR) */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

  /* Read data from the specified location */
  tmp =  (*(vu8 *) (AudioFileAddress + Offset));

  /* Disable the FSMC that share a pin w/ I2C1 (LBAR) */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, DISABLE);

  return tmp;
}

/*******************************************************************************
* Function Name  : Media_Init
* Description    : Read one byte from the media (SPI_Flash/NOR/NAND memories..)
* Input          : - Offset: the adress offset for read operation
* Output         : None.
* Return         : - 0 if initialization is OK
*                  - 1 if initialization failed..
*******************************************************************************/
u32 Media_Init(void)
{
  return 0;
}

/*******************************************************************************
* Function Name  : Media_BufferRead
* Description    : Read a buffer from the memory media
* Input          : - pBuffer: Destination buffer address
*                : - ReadAddr: start reading position
*                : - NumByteToRead: size of the buffer to read
* Output         : None.
* Return         : None.
*******************************************************************************/
void Media_BufferRead(u8* pBuffer, u32 ReadAddr, u16 NumByteToRead)
{
  /* Enable the FSMC that share a pin w/ I2C1 (LBAR) */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, ENABLE);

  /* Read the data */
  while (NumByteToRead--)
  {
    *pBuffer++ = *(vu8 *)ReadAddr++;
  }

  /* Disable the FSMC that share a pin w/ I2C1 (LBAR) */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_FSMC, DISABLE);
}

/*******************************************************************************
* Function Name  : Media_StartReadSequence
* Description    : Initialize reading sequence on the media.
* Input          : - ReadAddr: start reading position
* Output         : None.
* Return         : None.
*******************************************************************************/
void Media_StartReadSequence(u32 ReadAddr)
{
  /* This function could be used for memories needing a start read sequence
      like SPI_Flash memory */
}

/*******************************************************************************
* Function Name  : I2S_CODEC_DataTransfer
* Description    : Sends the audio data using the SPI2 peripheral and checks the
*                :   audio playing status (if a command (Pause/Stop) is pending
*                :   the playing status is updated). If the TXE flag interrupt
*                :   is used to synchronize data sending, this function should be
*                :   called in the SPI2 ISR.
* Input          : None.
* Output         : None.
* Return         : None.
*******************************************************************************/
void I2S_CODEC_DataTransfer(void)
{
  /* Audio codec configuration section -------------------------------------*/
  if (GetVar_SendDummyData() == 1)
  {
    /* Send a dummy data just to generate the I2S clock */
    SPI_I2S_SendData(SPI2, DUMMY_DATA);
  }
  /* Audio codec communication section -------------------------------------*/
  else
  {
    /* Send the data read from the memory */
    SPI_I2S_SendData(SPI2, (Media_ReadHalfWord(AudioDataIndex)));

    /* Increment the index */
    IncrementVar_AudioDataIndex(WAVE_Format.NumChannels);

    /* Check and update the stream playing status */
    I2S_CODEC_UpdateStatus();
  }
}
/*******************************************************************************
* Function Name  : delay
* Description    : Inserts a delay time.
* Input          : nCount: specifies the delay time length
* Output         : None
* Return         : The length of the wave file read from the SPI_Flash
*******************************************************************************/
void delay(vu32 nCount)
{
  for (; nCount != 0; nCount--);
}
#endif
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/