void initClocks() {
// enable HSI and set it as the system clock source
RCC_HSICmd(ENABLE);
while(!(RCC->CR & RCC_CR_HSIRDY)); // wait for it to be ready
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);
// disable PLL and PLLI2S
RCC_PLLCmd(DISABLE);
RCC_PLLI2SCmd(DISABLE);
// disable HSE and CSS (disabling the HSE also disables CSS)
RCC_HSEConfig(RCC_HSE_OFF);
// Configure PLL values and set source to HSE
RCC_PLLConfig(
RCC_PLLSource_HSE,
DESIRED_PLL_M,
DESIRED_PLL_N,
DESIRED_PLL_P,
DESIRED_PLL_Q
);
// set PLL I2S to our new values
RCC_PLLI2SConfig(
DESIRED_PLL_I2S_N,
DESIRED_PLL_I2S_R
);
// set I2S clock source to PLLI2S
RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S);
// set AHB, APB1, APB2 prescalers
RCC_HCLKConfig(DESIRED_HCLK_DIV);
RCC_PCLK1Config(DESIRED_PCLK1_DIV);
RCC_PCLK2Config(DESIRED_PCKL2_DIV);
// enable HSE
RCC_HSEConfig(RCC_HSE_ON);
if(RCC_WaitForHSEStartUp() == ERROR) RCC_DeInit(); // SHUT DOWN, EVERYTHING!
// enable CSS
RCC_ClockSecuritySystemCmd(ENABLE);
// enable PLL
RCC_PLLCmd(ENABLE);
while(!(RCC->CR & RCC_CR_PLLRDY)); // wait for ready
// enable PLL I2S
RCC_PLLI2SCmd(ENABLE);
// set system clock source to PLL
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
if(!checkClocks()){
// No actual error reporting done here because we don't want to depend on GPIO etc
while(1);
}
}
///////////////////////////////////////////////////////////////////////////////
////! Starts DMA driven I2S transfers
////! \param[in] *buffer pointer to sample buffer (contains L/R halfword)
////! \param[in] len size of audio buffer
///////////////////////////////////////////////////////////////////////////////
void CS43L22_Start(u32 *buffer, u16 len)
{
// start I2S DMA transfers
RCC_PLLI2SCmd(DISABLE);
#ifndef OVERCLOCK
RCC_PLLI2SConfig((uint32_t)214,(uint32_t)2); //I2S PLL dividers for 38009 calculated from stm32f407 datasheet!!!
#else
// RCC_PLLI2SConfig((uint32_t)198,(uint32_t)2); //I2S PLL dividers for 43010 calculated from stm32f407 datasheet!!!
RCC_PLLI2SConfig((uint32_t)258,(uint32_t)3); //I2S PLL dividers for 48000 from stm32f407 datasheet!!!
#endif
CS43L22_Config();
// reload DMA source address and counter
DMA_Cmd(DMA1_Stream5, DISABLE);
// ensure that IRQ flag is cleared (so that DMA IRQ isn't invoked by accident while this function is called)
DMA_ClearFlag(DMA1_Stream5, DMA_FLAG_TCIF5 | DMA_FLAG_TEIF5 | DMA_FLAG_HTIF5 | DMA_FLAG_FEIF5);
// take over new buffer pointer/length
DMA1_Stream5->M0AR = (u32)buffer;
DMA1_Stream5->NDTR = 2*len;
DMA_Cmd(DMA1_Stream5, ENABLE);
}
/**
* @brief Configure PLLSAI.
* @param None
* @retval None
*/
void PLLSAI_Config(void)
{
/* Configure PLLSAI prescalers */
/* PLLSAI_VCO : VCO_429M */
/* SAI_CLK(first level) = PLLSAI_VCO/PLLSAIQ = 429/2 = 214.5 Mhz */
RCC_PLLSAIConfig(429, 2, 4);
/* SAI_CLK_x = SAI_CLK(first level)/PLLSAIDIVQ = 214.5/19 = 11.289 Mhz */
RCC_SAIPLLSAIClkDivConfig(19);
/* Configure PLLI2S prescalers */
/* PLLI2S_VCO : VCO_344M */
/* SAI_CLK(first level) = PLLI2S_VCO/PLLI2SQ = 344/7 = 49.142 Mhz */
RCC_PLLI2SConfig(344, 7, 4);
/* SAI_CLK_x = SAI_CLK(first level)/PLLI2SDIVQ = 49.142/1 = 49.142 Mhz */
RCC_SAIPLLI2SClkDivConfig(1);
/* Configure Clock source for SAI Block A */
RCC_SAIBlockACLKConfig(RCC_SAIACLKSource_PLLSAI);
/* Configure Clock source for SAI Block B */
RCC_SAIBlockBCLKConfig(RCC_SAIBCLKSource_PLLI2S);
/* Enable PLLSAI Clock */
RCC_PLLSAICmd(ENABLE);
/* Wait till PLLSAI is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLSAIRDY) == RESET)
{
}
/* Enable PLLI2S Clock */
RCC_PLLI2SCmd(ENABLE);
/* Wait till PLLI2S is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLI2SRDY) == RESET)
{
}
}
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
}
//设置IIS的采样率(@MCKEN)
//samplerate:采样率,单位:Hz
//返回值:0,设置成功;1,无法设置.
u8 I2S2_SampleRate_Set(u32 samplerate)
{
u8 i=0;
u32 tempreg=0;
samplerate/=10;//缩小10倍
for(i=0;i<(sizeof(I2S_PSC_TBL)/10);i++)//看看改采样率是否可以支持
{
if(samplerate==I2S_PSC_TBL[i][0])break;
}
RCC_PLLI2SCmd(DISABLE);//先关闭PLLI2S
if(i==(sizeof(I2S_PSC_TBL)/10))return 1;//搜遍了也找不到
RCC_PLLI2SConfig((u32)I2S_PSC_TBL[i][1],(u32)I2S_PSC_TBL[i][2]);//设置I2SxCLK的频率(x=2) 设置PLLI2SN PLLI2SR
RCC->CR|=1<<26; //开启I2S时钟
while((RCC->CR&1<<27)==0); //等待I2S时钟开启成功.
tempreg=I2S_PSC_TBL[i][3]<<0; //设置I2SDIV
tempreg|=I2S_PSC_TBL[i][3]<<8; //设置ODD位
tempreg|=1<<9; //使能MCKOE位,输出MCK
SPI2->I2SPR=tempreg; //设置I2SPR寄存器
return 0;
}
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_init()
{
GPIO_InitTypeDef PinInitStruct;
GPIO_StructInit(&PinInitStruct);
I2S_InitTypeDef I2S_InitType;
I2C_InitTypeDef I2C_InitType;
//Reset pin as GPIO
PinInitStruct.GPIO_Pin = CODEC_RESET_PIN;
PinInitStruct.GPIO_Mode = GPIO_Mode_OUT;
PinInitStruct.GPIO_PuPd = GPIO_PuPd_DOWN;
PinInitStruct.GPIO_OType = GPIO_OType_PP;
PinInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_Init(GPIOD, &PinInitStruct);
// I2C pins
PinInitStruct.GPIO_Mode = GPIO_Mode_AF;
PinInitStruct.GPIO_OType = GPIO_OType_OD;
PinInitStruct.GPIO_Pin = I2C_SCL_PIN | I2C_SDA_PIN;
PinInitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
PinInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &PinInitStruct);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_I2C1);
//enable I2S and I2C clocks
//RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 | RCC_APB1Periph_SPI3, ENABLE);
RCC_PLLI2SCmd(ENABLE);
// I2S pins
PinInitStruct.GPIO_OType = GPIO_OType_PP;
PinInitStruct.GPIO_Pin = I2S3_SCLK_PIN | I2S3_SD_PIN | I2S3_MCLK_PIN;
GPIO_Init(GPIOC, &PinInitStruct);
PinInitStruct.GPIO_Pin = I2S3_WS_PIN;
GPIO_Init(GPIOA, &PinInitStruct);
//prepare output ports for alternate function
GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SPI3);
//keep Codec off for now
GPIO_ResetBits(GPIOD, CODEC_RESET_PIN);
// configure I2S port
SPI_I2S_DeInit(CODEC_I2S);
I2S_InitType.I2S_AudioFreq = I2S_AudioFreq_11k; // <-- tutaj zmienione
I2S_InitType.I2S_MCLKOutput = I2S_MCLKOutput_Enable;
I2S_InitType.I2S_DataFormat = I2S_DataFormat_16b; // <-- nie zmienioone, ale dlatego nie trzeba zmniejszac wartosci na 12 bitow
I2S_InitType.I2S_Mode = I2S_Mode_MasterTx;
I2S_InitType.I2S_Standard = I2S_Standard_Phillips;
I2S_InitType.I2S_CPOL = I2S_CPOL_Low;
I2S_Init(CODEC_I2S, &I2S_InitType);
I2S_Cmd(CODEC_I2S, ENABLE);
// configure I2C port
I2C_DeInit(CODEC_I2C);
I2C_InitType.I2C_ClockSpeed = 100000;
I2C_InitType.I2C_Mode = I2C_Mode_I2C;
I2C_InitType.I2C_OwnAddress1 = CORE_I2C_ADDRESS;
I2C_InitType.I2C_Ack = I2C_Ack_Enable;
I2C_InitType.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitType.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_Cmd(CODEC_I2C, ENABLE);
I2C_Init(CODEC_I2C, &I2C_InitType);
}
