/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f0xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f0xx.c file
*/
/* I2S peripheral Configuration */
I2S_Config();
/* Enable the Tamper button */
STM_EVAL_PBInit(BUTTON_TAMPER, BUTTON_MODE_GPIO);
/* Initialize the LEDs */
STM_EVAL_LEDInit(LED3);
STM_EVAL_LEDInit(LED1);
#if defined (I2S_MASTER_TRANSMITTER)
while (STM_EVAL_PBGetState(BUTTON_TAMPER) != RESET)
{}
/* Enable the I2S1 TX Interrupt */
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, ENABLE);
/* Enable the I2S */
I2S_Cmd(SPI1, ENABLE);
while(TxIdx < 32);
#elif defined (I2S_SLAVE_RECEIVER)
/* Enable the I2S1 RXNE Interrupt */
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, ENABLE);
/* Enable the I2S */
I2S_Cmd(SPI1, ENABLE);
/* Wait the end of communication */
while (RxIdx < 32);
/* Check if the data transmitted from Master Board and received by
Slave Board are the same */
TransferStatus = Buffercmp(I2S_Buffer_Rx, (uint16_t*)I2S_Buffer_Tx, 32);
if (TransferStatus == PASSED) /* successful transfer */
{
/* Green Led On */
STM_EVAL_LEDOn(LED1);
STM_EVAL_LEDOff(LED3);
}
else /* unsuccessful transfer */
{
/* Red Led On */
STM_EVAL_LEDOn(LED3);
STM_EVAL_LEDOff(LED1);
}
#endif
/* Infinite loop */
while (1)
{}
}
//*----------------------------------------------------------------------------
//* Function Name : I2S_Block_Process
//* Object :
//* Object :
//* Input Parameters :
//* Output Parameters :
//* Functions called :
//*----------------------------------------------------------------------------
void I2S_Block_Process(uint32_t txAddr, uint32_t rxAddr, uint32_t Size)
{
txbuf = txAddr;
rxbuf = rxAddr;
szbuf = Size;
// Configure the tx buffer address and size
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)txAddr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)Size;
// Configure the DMA Stream with the new parameters
DMA_Init(AUDIO_I2S_DMA_STREAM, &DMA_InitStructure);
// Configure the rx buffer address and size
DMA_InitStructure2.DMA_Memory0BaseAddr = (uint32_t)rxAddr;
DMA_InitStructure2.DMA_BufferSize = (uint32_t)Size;
// Configure the DMA Stream with the new parameters
DMA_Init(AUDIO_I2S_EXT_DMA_STREAM, &DMA_InitStructure2);
// Enable the I2S DMA Streams
DMA_Cmd(AUDIO_I2S_DMA_STREAM, ENABLE);
DMA_Cmd(AUDIO_I2S_EXT_DMA_STREAM, ENABLE);
// If the I2S peripheral is still not enabled, enable it
if ((CODEC_I2S->I2SCFGR & 0x0400) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
if ((CODEC_I2S_EXT->I2SCFGR & 0x0400) == 0)
{
I2S_Cmd(CODEC_I2S_EXT, ENABLE);
}
}
void I2S_Enable(){
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & 0x0400) == 0){
I2S_Cmd(CODEC_I2S, ENABLE);
}
if ((CODEC_I2S_EXT->I2SCFGR & 0x0400) == 0){
I2S_Cmd(CODEC_I2S_EXT, ENABLE);
}
}
//*----------------------------------------------------------------------------
//* Function Name : I2S_Block_Stop
//* Object :
//* Object :
//* Input Parameters :
//* Output Parameters :
//* Functions called :
//*----------------------------------------------------------------------------
void I2S_Block_Stop(void)
{
I2S_Cmd(CODEC_I2S_EXT, DISABLE);
I2S_Cmd(CODEC_I2S, DISABLE);
DMA_Cmd(AUDIO_I2S_EXT_DMA_STREAM, DISABLE);
DMA_Cmd(AUDIO_I2S_DMA_STREAM, DISABLE);
SPI_I2S_DMACmd(CODEC_I2S_EXT, SPI_I2S_DMAReq_Rx, DISABLE);
NVIC_DisableIRQ(AUDIO_I2S_EXT_DMA_IRQ);
DMA_ITConfig(AUDIO_I2S_EXT_DMA_STREAM, DMA_IT_TC | DMA_IT_HT, DISABLE);
}
/*******************************************************************************
* Function Name : INTR_RXSTSQLVL_ISODU_Callback
* Description : Rx FIFO Status Queue Level, Data Update interrupt callback routine.
* Input : None.
* Output : None.
* Return : None.
*******************************************************************************/
void INTR_RXSTSQLVL_ISODU_Callback(void)
{
/* Check if the USB transfer has reached the half of the global buffer */
if(IsocBufferIdx == (NUM_SUB_BUFFERS / 2))
{
/* Check if the DMA is already enabled or not */
if ((DMA1_Channel5->CCR & 0x1) == 0x0)
{
/* Re-Initialize the number of data to be transferred */
DMA1_Channel5->CNDTR = (uint16_t)((ISOC_BUFFER_SZE * NUM_SUB_BUFFERS) / 2);
/* Enable DMA1 Channel5 */
DMA_Cmd(DMA1_Channel5, ENABLE);
/* Enable I2S DMA request for TX */
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, ENABLE);
/* Enable the I2S cell */
I2S_Cmd(SPI2, ENABLE);
}
/* Wait till the TC flag is ON (direct register access to optimize time) */
while (((DMA1->ISR & (uint32_t)0x00020000) == 0))
{}
/* Clear All DMA1 channel 5 flags */
DMA_ClearFlag(DMA1_FLAG_GL5);
}
}
/**
* @brief Starts playing audio stream from the audio Media.
* @param None
* @retval None
*/
void Audio_MAL_Play(uint32_t Addr, uint32_t Size)
{
if (CurrAudioInterface == AUDIO_INTERFACE_I2S)
{
/* Configure the buffer address and size */
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)Size/2;
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_STREAM, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_STREAM, ENABLE);
}
#ifndef DAC_USE_I2S_DMA
else
{
/* Configure the buffer address and size */
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)Size;
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_STREAM, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_STREAM, ENABLE);
}
#endif /* DAC_USE_I2S_DMA */
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
}
/**
* @brief Pauses or Resumes the audio stream playing from the Media.
* @param Cmd: AUDIO_PAUSE (or 0) to pause, AUDIO_RESUME (or any value different
* from 0) to resume.
* @param Addr: Address from/at which the audio stream should resume/pause.
* @retval None
*/
static void Audio_MAL_PauseResume(uint32_t Cmd, uint32_t Addr)
{
/* Pause the audio file playing */
if (Cmd == AUDIO_PAUSE)
{
/* Disable the I2S DMA request */
SPI_I2S_DMACmd(CODEC_I2S, SPI_I2S_DMAReq_Tx, DISABLE);
/* Pause the I2S DMA Stream
Note. For the STM32F40x devices, the DMA implements a pause feature,
by disabling the stream, all configuration is preserved and data
transfer is paused till the next enable of the stream.
This feature is not available on STM32F40x devices. */
DMA_Cmd(AUDIO_MAL_DMA_STREAM, DISABLE);
}
else /* AUDIO_RESUME */
{
/* Enable the I2S DMA request */
SPI_I2S_DMACmd(CODEC_I2S, SPI_I2S_DMAReq_Tx, ENABLE);
/* Resume the I2S DMA Stream
Note. For the STM32F40x devices, the DMA implements a pause feature,
by disabling the stream, all configuration is preserved and data
transfer is paused till the next enable of the stream.
This feature is not available on STM32F40x devices. */
DMA_Cmd(AUDIO_MAL_DMA_STREAM, ENABLE);
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
}
}
/*******************************************************************************
* 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
*******************************************************************************/
static void I2S_Config(uint16_t Standard, uint16_t MCLKOutput, uint16_t 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_High;
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);
printf("\n\r I2S peripheral Config finished");
}
/**
* @brief I2S_Stop 停止iis总线
* @param none
* @retval none
*/
void I2S_Stop(void)
{
/* 禁能 SPI2/I2S2 外设 */
//SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, DISABLE);
I2S_Cmd(SPI2, DISABLE);
DMA_Cmd(DMA1_Channel5, DISABLE);
}
/*******************************************************************************
* Function Name : INTR_SOFINTR_Callback
* Description : Start of frame callback function.
* Input : None.
* Output : None.
* Return : None.
*******************************************************************************/
void INTR_SOFINTR_Callback(void)
{
static __IO uint32_t EmptyFrameCounter = 0;
/* If frame hasn't changed and the DMA is enabled */
if (IsocBufferIdx == PrevFrame)
{
/* Empty packet state */
EmptyFrameCounter++;
}
else
{
/* Update status */
PrevFrame = IsocBufferIdx;
/* Streaming Active state */
EmptyFrameCounter = 0;
}
/* Stream Inactive state */
if (EmptyFrameCounter == 5)
{
/* Mute the audio codec to avoid spurious noise */
CODEC_Mute(MUTE_ON);
/* Disable the I2S and the DMA request */
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Tx, DISABLE);
I2S_Cmd(SPI2, DISABLE);
/* Disable the DMA channel and clear all its flags*/
DMA1_Channel5->CCR &= 0xFFFFFFFE;
DMA_ClearFlag(DMA1_FLAG_GL5);
/* Enable the I2S interrupt to continue generating the clocks for the audio codec
otherwise there will be a noise on the line when no file is played */
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, ENABLE);
I2S_Cmd(SPI2, ENABLE);
/* Reset counters */
IsocBufferIdx = 0;
PrevFrame = 0;
/* Idle state */
EmptyFrameCounter ++;
}
}
static rt_err_t codec_open(rt_device_t dev, rt_uint16_t oflag)
{
#if !CODEC_MASTER_MODE
/* enable I2S */
I2S_Cmd(CODEC_I2S_PORT, ENABLE);
#endif
return RT_EOK;
}
/*******************************************************************************
* Function Name : EP1_OUT_Callback
* Description : Endpoint 1 out callback routine.
* Input : None.
* Output : None.
* Return : None.
*******************************************************************************/
void EP1_OUT_Callback(void)
{
DMA_InitTypeDef DMA_InitStructure;
#ifdef USE_STM3210C_EVAL
/* Get the Endpoint descriptor pointer */
ep = PCD_GetOutEP(ENDP1 & 0x7F);
/* Enable the Endpoint transfer (since the the Read Endpoint function is
not called) */
OTGD_FS_EPStartXfer(ep);
/* Toggle the data PID */
if (ep->even_odd_frame != 0)
{
ep->even_odd_frame = 0;
}
else
{
ep->even_odd_frame = 1;
}
/* If Half of global buffer has been filled and DMA is still not enabled,
Re-configure the DMA and unMute the codec */
#if (NUM_SUB_BUFFERS == 2)
if (((DMA1_Channel5->CCR & 0x1) == 0) && (IsocBufferIdx == 1))
#else
if (((DMA1_Channel5->CCR & 0x1) == 0) && (IsocBufferIdx == ((NUM_SUB_BUFFERS / 2) - 1)))
#endif /* NUM_SUB_BUFFERS */
{
/* Disable the mute mode */
CODEC_Mute(MUTE_OFF);
/* Disable the I2S before starting configuration to avoid spurious transfer */
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_TXE, DISABLE);
I2S_Cmd(SPI2, DISABLE);
/* Initialize the DMA1 Channel5 to its default values */
DMA_DeInit(DMA1_Channel5);
/* Configure the DMA parameters */
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)((uint16_t*)IsocBuff);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SPI2_DR_Address;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = (ISOC_BUFFER_SZE * NUM_SUB_BUFFERS) / 2; /* Divided by 2 because USB data are 8 bit and I2S buffer is 16 bit */
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
}
#endif /* USE_STM3210C_EVAL */
}
//???????????
void Audio_MAL_Play(u32 Addr, u32 Size)
{
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Addr;//??????????
DMA_InitStructure.DMA_BufferSize = (uint32_t)Size/2;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel5, ENABLE);//I2S DMA??
if ((SPI2->I2SCFGR & I2S_ENABLE_MASK) == 0)
I2S_Cmd(SPI2, ENABLE);//?I2S?????,???
}
/**
* @brief Restores the Audio Codec audio interface to its default state.
* @param None.
* @retval None.
*/
static void Codec_AudioInterface_DeInit(void)
{
/* Disable the CODEC_I2S peripheral (in case it hasn't already been disabled) */
I2S_Cmd(CODEC_I2S, DISABLE);
/* Deinitialize the CODEC_I2S peripheral */
SPI_I2S_DeInit(CODEC_I2S);
/* Disable the CODEC_I2S peripheral clock */
RCC_APB1PeriphClockCmd(CODEC_I2S_CLK, DISABLE);
}
/*******************************************************************************
* Function Name : I2S_Config
* Description : Initializes the I2S peripheral.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
static void I2S_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2S_InitTypeDef I2S_InitStructure;
/* Enable GPIOB, GPIOC and AFIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC |
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_Init(GPIOC, &GPIO_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 = I2S_Standard_Phillips;
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
#ifdef AUDIO_FREQ_96K
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_96k;
#elif defined (AUDIO_FREQ_48K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_48k;
#elif defined (AUDIO_FREQ_44K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_44k;
#elif defined (AUDIO_FREQ_32K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_32k;
#elif defined (AUDIO_FREQ_22K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_22k;
#elif defined (AUDIO_FREQ_16K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_16k;
#elif defined (AUDIO_FREQ_11K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_11k;
#elif defined (AUDIO_FREQ_8K)
I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_8k;
#endif /* AUDIO_FREQ_96K */
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
I2S_Init(SPI2, &I2S_InitStructure);
/* Enable the SPI2/I2S2 peripheral */
I2S_Cmd(SPI2, ENABLE);
}
/**
* @brief I2S_Bus_Init 初始化iis总线
* @param none
* @retval none
*/
void I2S_Bus_Init(void)
{
/* 配置I2S GPIO用到的引脚 */
I2S_GPIO_Config();
/* 配置I2S工作模式 */
I2S_Mode_Config();
I2S_Cmd(SPI2, DISABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}
/**
* @brief Stops audio stream playing on the used Media.
* @param None
* @retval None
*/
static void Audio_MAL_Stop(void)
{
/* Stop the Transfer on the I2S side: Stop and disable the DMA channel */
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, DISABLE);
/* Clear all the DMA flags for the next transfer */
DMA_ClearFlag(AUDIO_MAL_DMA_FLAG_TC |AUDIO_MAL_DMA_FLAG_HT | AUDIO_MAL_DMA_FLAG_TE);
/*
The I2S DMA requests are not disabled here.
*/
/* In all modes, disable the I2S peripheral */
I2S_Cmd(CODEC_I2S, DISABLE);
}
/**
* @brief Starts playing audio stream from the audio Media.
* @param Addr: Pointer to the audio stream buffer
* @param Size: Number of data in the audio stream buffer
* @retval None.
*/
void Audio_MAL_Play(uint32_t Addr, uint32_t Size)
{
#ifndef AUDIO_USE_MACROS
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_STREAM, DISABLE);
/* Clear the Interrupt flag */
DMA_ClearFlag(AUDIO_MAL_DMA_STREAM, AUDIO_MAL_DMA_FLAG_TC);
/* Wait the DMA Stream to be effectively disabled */
while (DMA_GetCmdStatus(AUDIO_MAL_DMA_STREAM) != DISABLE)
{}
/* Configure the buffer address and size */
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)(Size*2);
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_STREAM, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_STREAM, ENABLE);
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
#else
/* Disable the I2S DMA Stream*/
AUDIO_MAL_DMA_STREAM->CR &= ~(uint32_t)DMA_SxCR_EN;
/* Clear the Interrupt flag */
AUDIO_MAL_DMA->AUDIO_MAL_DMA_IFCR = (uint32_t)(AUDIO_MAL_DMA_FLAG_TC & 0x0F7D0F7D);
/* Wait the DMA Stream to be effectively disabled */
while ((AUDIO_MAL_DMA_STREAM->CR & (uint32_t)DMA_SxCR_EN) != 0)
{}
/* Configure the buffer address and size */
AUDIO_MAL_DMA_STREAM->M0AR = (uint32_t)Addr;
AUDIO_MAL_DMA_STREAM->NDTR = (uint32_t)(Size*2);
/* Enable the I2S DMA Stream*/
AUDIO_MAL_DMA_STREAM->CR |= (uint32_t)DMA_SxCR_EN;
/* If the I2S peripheral is still not enabled, enable it */
CODEC_I2S->I2SCFGR |= SPI_I2SCFGR_I2SE;
#endif /* AUDIO_USE_MACROS */
}
void Codec_AudioInterface_Init(uint32_t AudioFreq)
{
//Setup I2C comms to codec
Codec_GPIO_Init();
I2C_Cntrl_Init();
//Bring Up Codec via the I2C comms
Codec_Init();
//Invoke I2S Pin connections
I2S_GPIO_Init();
//Now, get down to defining I2S, Full Duplex, Codec Master Configuration
I2S_InitTypeDef I2S_InitStructure;
/* Enable the CODEC_I2S peripheral clock */
RCC_APB1PeriphClockCmd(CODEC_I2S_CLK, ENABLE);
/* CODEC_I2S peripheral configuration */
I2S_InitStructure.I2S_AudioFreq = AudioFreq;
I2S_InitStructure.I2S_Standard = I2S_Standard_MSB;
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveTx;
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
/* Initialize the I2S peripheral with the structure above */
I2S_Init(CODEC_I2S, &I2S_InitStructure);
I2S_FullDuplexConfig(I2S3ext, &I2S_InitStructure);
//Turn on the I2S interface
I2S_Cmd(CODEC_I2S, ENABLE);
I2S_Cmd(I2S3ext, ENABLE);
}
/**
* @brief I2S_Freq_Config 根据采样频率配置iis总线，在播放音频文件时可从文件中解码获取
* @param SampleFreq 采样频率
* @retval none
*/
void I2S_Freq_Config(uint16_t SampleFreq)
{
I2S_InitTypeDef I2S_InitStructure;
I2S_Stop();
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx; // 配置I2S工作模式
I2S_InitStructure.I2S_Standard = I2S_Standard_LSB; // 接口标准
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b; // 数据格式，16bit
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable; // 主时钟模式
I2S_InitStructure.I2S_AudioFreq = SampleFreq; // 音频采样频率
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
I2S_Init(SPI2, &I2S_InitStructure);
I2S_Cmd(SPI2, ENABLE); //使能iis总线
}
/**
* @brief Stop audio recording
* @param None
* @retval None
*/
uint32_t MicListenerStop(void)
{
/* Check if the interface has already been initialized */
if (AudioMicInited)
{
/* Stop conversion */
I2S_Cmd(SPI2, DISABLE);
/* Return 0 if all operations are OK */
return 0;
}
else
{
/* Cannot perform operation */
return 1;
}
}
//参数I2S_Standard: @ref SPI_I2S_Standard I2S标准,
//I2S_Standard_Phillips,飞利浦标准;
//I2S_Standard_MSB,MSB对齐标准(右对齐);
//I2S_Standard_LSB,LSB对齐标准(左对齐);
//I2S_Standard_PCMShort,I2S_Standard_PCMLong:PCM标准
//参数I2S_Mode: @ref SPI_I2S_Mode I2S_Mode_SlaveTx:从机发送;I2S_Mode_SlaveRx:从机接收;I2S_Mode_MasterTx:主机发送;I2S_Mode_MasterRx:主机接收;
//参数I2S_Clock_Polarity @ref SPI_I2S_Clock_Polarity: I2S_CPOL_Low,时钟低电平有效;I2S_CPOL_High,时钟高电平有效
//参数I2S_DataFormat： @ref SPI_I2S_Data_Format :数据长度,I2S_DataFormat_16b,16位标准;I2S_DataFormat_16bextended,16位扩展(frame=32bit);I2S_DataFormat_24b,24位;I2S_DataFormat_32b,32位.
void I2S2_Init(u16 I2S_Standard,u16 I2S_Mode,u16 I2S_Clock_Polarity,u16 I2S_DataFormat)
{
I2S_InitTypeDef I2S_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);//使能SPI2时钟
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,ENABLE); //复位SPI2
RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2,DISABLE);//结束复位
I2S_InitStructure.I2S_Mode=I2S_Mode;//IIS模式
I2S_InitStructure.I2S_Standard=I2S_Standard;//IIS标准
I2S_InitStructure.I2S_DataFormat=I2S_DataFormat;//IIS数据长度
I2S_InitStructure.I2S_MCLKOutput=I2S_MCLKOutput_Disable;//主时钟输出禁止
I2S_InitStructure.I2S_AudioFreq=I2S_AudioFreq_Default;//IIS频率设置
I2S_InitStructure.I2S_CPOL=I2S_Clock_Polarity;//空闲状态时钟电平
I2S_Init(SPI2,&I2S_InitStructure);//初始化IIS
SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Tx,ENABLE);//SPI2 TX DMA请求使能.
I2S_Cmd(SPI2,ENABLE);//SPI2 I2S EN使能.
}
/**
* @brief Starts playing audio stream from the audio Media.
* @param None
* @retval None
*/
static void Audio_MAL_Play(uint32_t Addr, uint32_t Size)
{
#ifndef I2S_INTERRUPT
if (CurrAudioInterface == AUDIO_INTERFACE_I2S) {
/* Configure the buffer address and size */
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t) Size;
/* Configure the DMA Channel with the new parameters */
DMA_Init(AUDIO_MAL_DMA_CHANNEL, &DMA_InitStructure);
/* Enable the I2S DMA Channel */
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, ENABLE);
}
#else
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0) {
I2S_Cmd(CODEC_I2S, ENABLE);
}
#endif /* I2S_INTERRUPT */
}
void audioInit()
{
I2S_InitTypeDef I2S_InitStructure;
Audio_GPIO_Init();
/*CONFIG the I2S_RCC ,MUST before enabling the I2S APB clock*/
//PLLI2SN 302,PLLI2SR 2,I2SDIV 53,I2SODD 1,FS 44.1KHZ,16bit,Error 0.0011%
RCC_PLLI2SConfig(302,2);
RCC_PLLI2SCmd(ENABLE);
RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S);
/* Enable the CODEC_I2S peripheral clock */
RCC_APB1PeriphClockCmd(CODEC_I2S_CLK, ENABLE);
/* CODEC_I2S peripheral configuration */
SPI_I2S_DeInit(CODEC_I2S);
I2S_InitStructure.I2S_AudioFreq = AudioFreq;
I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;//clk 0 when idle state
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
#ifdef CODEC_MCLK_ENABLED
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
#elif defined(CODEC_MCLK_DISABLED)
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
#else
#error "No selection for the MCLK output has been defined !"
#endif /* CODEC_MCLK_ENABLED */
/* Initialize the I2S peripheral with the structure above */
I2S_Init(CODEC_I2S, &I2S_InitStructure);
I2S_Cmd(CODEC_I2S, ENABLE);
//interrupt
#ifdef CODEC_USE_INT
SPI_I2S_ITConfig(CODEC_I2S,SPI_I2S_IT_TXE,ENABLE);
#elif defined(CODEC_USE_DMA)
#error "DMA is not initialized"
#endif
}
/**
* @brief Start audio recording
* @param pbuf: pointer to a buffer
* @retval None
*/
uint8_t WaveRecorderStart(uint16_t* pbuf)
{
/* Check if the interface has already been initialized */
if (AudioRecInited)
{
/* Store the location and size of the audio buffer */
pAudioRecBuf = pbuf;
/* Enable the Rx buffer not empty interrupt */
SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE);
/* The Data transfer is performed in the SPI interrupt routine */
/* Enable the SPI peripheral */
I2S_Cmd(SPI2, ENABLE);
/* Return 0 if all operations are OK */
return 0;
}
else
{
/* Cannot perform operation */
return 1;
}
}
/**
* @brief Pauses or Resumes the audio stream playing from the Media.
* @param Cmd: AUDIO_PAUSE (or 0) to pause, AUDIO_RESUME (or any value different
* from 0) to resume.
* @param Addr: Address from/at which the audio stream should resume/pause.
* @param Size: Number of data to be configured for next resume.
* @retval None.
*/
void Audio_MAL_PauseResume(uint32_t Cmd, uint32_t Addr, uint32_t Size)
{
/* Pause the audio file playing */
if (Cmd == AUDIO_PAUSE)
{
/* Stop the current DMA request by resetting the I2S cell */
Codec_AudioInterface_DeInit();
/* Re-configure the I2S interface for the next resume operation */
Codec_AudioInterface_Init(I2S_InitStructure.I2S_AudioFreq);
/* Disable the DMA Stream */
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, DISABLE);
/* Clear the Interrupt flag */
DMA_ClearFlag(AUDIO_MAL_DMA_FLAG_ALL);
}
else /* AUDIO_RESUME */
{
/* Configure the buffer address and size */
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)(Size*2);
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_CHANNEL, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, ENABLE);
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
}
}
/**
* @brief Starts playing audio stream from the audio Media.
* @param Addr: Pointer to the audio stream buffer
* @param Size: Number of data in the audio stream buffer
* @retval None.
*/
void Audio_MAL_Play(uint32_t Addr, uint32_t Size)
{
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, DISABLE);
/* Clear the Interrupt flag */
DMA_ClearFlag(AUDIO_MAL_DMA_FLAG_TC);
/* Configure the buffer address and size */
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Addr;
DMA_InitStructure.DMA_BufferSize = (uint32_t)(Size*2);
/* Configure the DMA Stream with the new parameters */
DMA_Init(AUDIO_MAL_DMA_CHANNEL, &DMA_InitStructure);
/* Enable the I2S DMA Stream*/
DMA_Cmd(AUDIO_MAL_DMA_CHANNEL, ENABLE);
/* If the I2S peripheral is still not enabled, enable it */
if ((CODEC_I2S->I2SCFGR & I2S_ENABLE_MASK) == 0)
{
I2S_Cmd(CODEC_I2S, ENABLE);
}
}
/**
* @brief Options control function.
* @param cmd: pointer to the command/option buffer.
* @param size: Size of the command/option buffer.
* @retval Value of the current audio sampling rate.
*/
static uint32_t OptionCtrl (uint8_t* cmd, uint32_t size)
{
uint32_t freq = 48000;
/* Decode the audio frequency */
freq = (uint32_t)(*(uint8_t*)(cmd) | (*(uint8_t*)(cmd + 1) << 8) | (*(uint8_t*)(cmd + 2) << 16));
/* Check ff the requested audio frequency is not supported */
if ((freq > MAX_AUDIO_FREQ) || (freq < MIN_AUDIO_FREQ))
{
/* Set the default audio frequency */
freq = DEFAULT_OUT_AUDIO_FREQ;
}
#ifdef USE_SYNCHRONIZATION
/* If the external clock is used, reconfigure the clock synthesizer sub-system */
AUDIO_CORR_Out_Update(freq, 0, 0, 0);
#endif /* USE_SYNCHRONIZATION */
/* If the I2S peripheral is still not enabled, enable it */
I2S_Cmd(CODEC_I2S, ENABLE);
return freq;
}
void CS43L22_Config() {
// configure STM32F4Discovery I2S pins
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Pin = STM32F4D_I2S_WS_PIN;
GPIO_Init(STM32F4D_I2S_WS_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(STM32F4D_I2S_WS_PORT, STM32F4D_I2S_WS_PINSRC, GPIO_AF_SPI3);
GPIO_InitStructure.GPIO_Pin = STM32F4D_I2S_CK_PIN;
GPIO_Init(STM32F4D_I2S_CK_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(STM32F4D_I2S_CK_PORT, STM32F4D_I2S_CK_PINSRC, GPIO_AF_SPI3);
GPIO_InitStructure.GPIO_Pin = STM32F4D_I2S_SD_PIN;
GPIO_Init(STM32F4D_I2S_SD_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(STM32F4D_I2S_SD_PORT, STM32F4D_I2S_SD_PINSRC, GPIO_AF_SPI3);
GPIO_InitStructure.GPIO_Pin = STM32F4D_I2S_MCLK_PIN;
GPIO_Init(STM32F4D_I2S_MCLK_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(STM32F4D_I2S_MCLK_PORT, STM32F4D_I2S_MCLK_PINSRC, GPIO_AF_SPI3);
// configure I2C pins to access the CS43L22 configuration registers
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = CODEC_I2C_SCL_PIN;
GPIO_Init(CODEC_I2C_SCL_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(CODEC_I2C_SCL_PORT, GPIO_PinSource6, GPIO_AF_I2C1);
GPIO_InitStructure.GPIO_Pin = CODEC_I2C_SDA_PIN;
GPIO_Init(CODEC_I2C_SDA_PORT, &GPIO_InitStructure);
GPIO_PinAFConfig(CODEC_I2C_SDA_PORT, GPIO_PinSource9, GPIO_AF_I2C1);
// CS43L22 reset pin
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Pin = CODEC_RESET_PIN;
GPIO_Init(CODEC_RESET_PORT, &GPIO_InitStructure);
GPIO_ResetBits(CODEC_RESET_PORT, CODEC_RESET_PIN); // activate reset
// I2S initialisation
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
RCC_PLLI2SCmd(ENABLE); // new for STM32F4: enable I2S PLL
SPI_I2S_DeInit(SPI3);
I2S_InitTypeDef I2S_InitStructure;
I2S_StructInit(&I2S_InitStructure);
I2S_InitStructure.I2S_Standard = STM32F4D_I2S_STANDARD;
I2S_InitStructure.I2S_DataFormat = STM32F4D_I2S_DATA_FORMAT;
I2S_InitStructure.I2S_MCLKOutput = STM32F4D_I2S_MCLK_ENABLE ? I2S_MCLKOutput_Enable : I2S_MCLKOutput_Disable;
I2S_InitStructure.I2S_AudioFreq = (u16)(STM32F4D_I2S_AUDIO_FREQ);
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low; // configuration required as well?
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx;
I2S_Init(SPI3, &I2S_InitStructure);
I2S_Cmd(SPI3, ENABLE);
// DMA Configuration for SPI Tx Event
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitTypeDef DMA_InitStructure;
DMA_StructInit(&DMA_InitStructure);
DMA_Cmd(DMA1_Stream5, DISABLE);
DMA_ClearFlag(DMA1_Stream5, DMA_FLAG_TCIF5 | DMA_FLAG_TEIF5 | DMA_FLAG_HTIF5 | DMA_FLAG_FEIF5);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&SPI3->DR;
// DMA_InitStructure.DMA_MemoryBaseAddr = ...; // configured in CS43L22_Start
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
// DMA_InitStructure.DMA_BufferSize = ...; // configured in CS43L22_Start
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream5, &DMA_InitStructure);
// DMA_Cmd(DMA1_Stream5, ENABLE); // done on CS43L22_Start
DMA_ITConfig(DMA1_Stream5, DMA_IT_TE | DMA_IT_FE, DISABLE);
// trigger interrupt when transfer half complete/complete
DMA_ITConfig(DMA1_Stream5, DMA_IT_HT | DMA_IT_TC, ENABLE);
// enable SPI interrupts to DMA
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
// Configure and enable DMA interrupt
/* Configure the DMA IRQ handler priority */
NVIC_SetPriority(DMA1_Stream5_IRQn, 0x0);
NVIC_EnableIRQ(DMA1_Stream5_IRQn);
// configure I2C
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
I2C_DeInit(CODEC_I2C);
I2C_InitTypeDef I2C_InitStructure;
I2C_StructInit(&I2C_InitStructure);
I2C_InitStructure.I2C_ClockSpeed = 100000;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_OwnAddress1 = CORE_I2C_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_Cmd(CODEC_I2C, ENABLE);
I2C_Init(CODEC_I2C, &I2C_InitStructure);
codec_init();
}
void codec_dma_isr(void)
{
/* switch to next buffer */
rt_uint16_t next_index;
void* data_ptr;
next_index = codec.read_index + 1;
if (next_index >= DATA_NODE_MAX)
next_index = 0;
/* save current data pointer */
data_ptr = codec.data_list[codec.read_index].data_ptr;
#if !CODEC_MASTER_MODE
if (codec_sr_new)
{
I2S_Configuration(codec_sr_new);
I2S_Cmd(CODEC_I2S_PORT, ENABLE);
codec_sr_new = 0;
}
#endif
codec.read_index = next_index;
if (next_index != codec.put_index)
{
/* enable next dma request */
DMA_Configuration((rt_uint32_t) codec.data_list[codec.read_index].data_ptr, codec.data_list[codec.read_index].data_size);
#if CODEC_MASTER_MODE
if ((r06 & MS) == 0)
{
CODEC_I2S_PORT->I2SCFGR |= SPI_I2SCFGR_I2SE;
r06 |= MS;
codec_send(r06);
}
#endif
}
else
{
#if CODEC_MASTER_MODE
if (r06 & MS)
{
CODEC_I2S_DMA->CCR &= ~DMA_CCR1_EN;
while ((CODEC_I2S_PORT->SR & SPI_I2S_FLAG_TXE) == 0);
while ((CODEC_I2S_PORT->SR & SPI_I2S_FLAG_BSY) != 0);
CODEC_I2S_PORT->I2SCFGR &= ~SPI_I2SCFGR_I2SE;
r06 &= ~MS;
codec_send(r06);
}
#endif
rt_kprintf("*\n");
}
/* notify transmitted complete. */
if (codec.parent.tx_complete != RT_NULL)
{
codec.parent.tx_complete(&codec.parent, data_ptr);
}
}