/**
* @brief Initializes the I2S according to the specified parameters
* in the I2S_InitTypeDef and create the associated handle.
* @param hi2s: pointer to a I2S_HandleTypeDef structure that contains
* the configuration information for I2S module
* @retval HAL status
*/
__weak HAL_StatusTypeDef HAL_I2S_Init(I2S_HandleTypeDef *hi2s)
{
uint32_t tmpreg = 0, i2sdiv = 2, i2sodd = 0, packetlength = 1;
uint32_t tmp = 0, i2sclk = 0;
/* Check the I2S handle allocation */
if(hi2s == NULL)
{
return HAL_ERROR;
}
/* Check the I2S parameters */
assert_param(IS_I2S_ALL_INSTANCE(hi2s->Instance));
assert_param(IS_I2S_MODE(hi2s->Init.Mode));
assert_param(IS_I2S_STANDARD(hi2s->Init.Standard));
assert_param(IS_I2S_DATA_FORMAT(hi2s->Init.DataFormat));
assert_param(IS_I2S_MCLK_OUTPUT(hi2s->Init.MCLKOutput));
assert_param(IS_I2S_AUDIO_FREQ(hi2s->Init.AudioFreq));
assert_param(IS_I2S_CPOL(hi2s->Init.CPOL));
assert_param(IS_I2S_CLOCKSOURCE(hi2s->Init.ClockSource));
if(hi2s->State == HAL_I2S_STATE_RESET)
{
/* Allocate lock resource and initialize it */
hi2s->Lock = HAL_UNLOCKED;
/* Init the low level hardware : GPIO, CLOCK, CORTEX...etc */
HAL_I2S_MspInit(hi2s);
}
hi2s->State = HAL_I2S_STATE_BUSY;
/*----------------------- SPIx I2SCFGR & I2SPR Configuration ---------------*/
/* Clear I2SMOD, I2SE, I2SCFG, PCMSYNC, I2SSTD, CKPOL, DATLEN and CHLEN bits */
hi2s->Instance->I2SCFGR &= ~(SPI_I2SCFGR_CHLEN | SPI_I2SCFGR_DATLEN | SPI_I2SCFGR_CKPOL | \
SPI_I2SCFGR_I2SSTD | SPI_I2SCFGR_PCMSYNC | SPI_I2SCFGR_I2SCFG | \
SPI_I2SCFGR_I2SE | SPI_I2SCFGR_I2SMOD);
hi2s->Instance->I2SPR = 0x0002;
/* Get the I2SCFGR register value */
tmpreg = hi2s->Instance->I2SCFGR;
/* If the default frequency value has to be written, reinitialize i2sdiv and i2sodd */
/* If the requested audio frequency is not the default, compute the prescaler */
if(hi2s->Init.AudioFreq != I2S_AUDIOFREQ_DEFAULT)
{
/* Check the frame length (For the Prescaler computing) *******************/
if(hi2s->Init.DataFormat != I2S_DATAFORMAT_16B)
{
/* Packet length is 32 bits */
packetlength = 2;
}
/* Get I2S source Clock frequency ****************************************/
/* If an external I2S clock has to be used, the specific define should be set
in the project configuration or in the stm32f4xx_conf.h file */
i2sclk = I2S_GetInputClock(hi2s);
/* Compute the Real divider depending on the MCLK output state, with a floating point */
if(hi2s->Init.MCLKOutput == I2S_MCLKOUTPUT_ENABLE)
{
/* MCLK output is enabled */
tmp = (uint32_t)(((((i2sclk / 256) * 10) / hi2s->Init.AudioFreq)) + 5);
}
else
{
/* MCLK output is disabled */
tmp = (uint32_t)(((((i2sclk / (32 * packetlength)) *10 ) / hi2s->Init.AudioFreq)) + 5);
}
/* Remove the flatting point */
tmp = tmp / 10;
/* Check the parity of the divider */
i2sodd = (uint32_t)(tmp & (uint32_t)1);
/* Compute the i2sdiv prescaler */
i2sdiv = (uint32_t)((tmp - i2sodd) / 2);
/* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
i2sodd = (uint32_t) (i2sodd << 8);
}
/* Test if the divider is 1 or 0 or greater than 0xFF */
if((i2sdiv < 2) || (i2sdiv > 0xFF))
{
/* Set the default values */
i2sdiv = 2;
i2sodd = 0;
}
/* Write to SPIx I2SPR register the computed value */
hi2s->Instance->I2SPR = (uint32_t)((uint32_t)i2sdiv | (uint32_t)(i2sodd | (uint32_t)hi2s->Init.MCLKOutput));
/* Configure the I2S with the I2S_InitStruct values */
tmpreg |= (uint32_t)(SPI_I2SCFGR_I2SMOD | hi2s->Init.Mode | hi2s->Init.Standard | hi2s->Init.DataFormat | hi2s->Init.CPOL);
#if defined(SPI_I2SCFGR_ASTRTEN)
if (hi2s->Init.Standard == I2S_STANDARD_PCM_SHORT)
{
/* Write to SPIx I2SCFGR */
hi2s->Instance->I2SCFGR = tmpreg | SPI_I2SCFGR_ASTRTEN;
}
else
{
/* Write to SPIx I2SCFGR */
hi2s->Instance->I2SCFGR = tmpreg;
}
#else
/* Write to SPIx I2SCFGR */
hi2s->Instance->I2SCFGR = tmpreg;
#endif
hi2s->ErrorCode = HAL_I2S_ERROR_NONE;
hi2s->State= HAL_I2S_STATE_READY;
return HAL_OK;
}
/**
* @brief Initializes the I2S according to the specified parameters
* in the I2S_InitTypeDef and create the associated handle.
* @param hi2s: pointer to a I2S_HandleTypeDef structure that contains
* the configuration information for I2S module
* @retval HAL status
*/
HAL_StatusTypeDef HAL_I2S_Init(I2S_HandleTypeDef *hi2s)
{
uint32_t i2sdiv = 2, i2sodd = 0, packetlength = 1;
uint32_t tmp = 0, i2sclk = 0;
/* Check the I2S handle allocation */
if(hi2s == NULL)
{
return HAL_ERROR;
}
/* Check the I2S parameters */
assert_param(IS_I2S_ALL_INSTANCE(hi2s->Instance));
assert_param(IS_I2S_MODE(hi2s->Init.Mode));
assert_param(IS_I2S_STANDARD(hi2s->Init.Standard));
assert_param(IS_I2S_DATA_FORMAT(hi2s->Init.DataFormat));
assert_param(IS_I2S_MCLK_OUTPUT(hi2s->Init.MCLKOutput));
assert_param(IS_I2S_AUDIO_FREQ(hi2s->Init.AudioFreq));
assert_param(IS_I2S_CPOL(hi2s->Init.CPOL));
if(hi2s->State == HAL_I2S_STATE_RESET)
{
/* Allocate lock resource and initialize it */
hi2s->Lock = HAL_UNLOCKED;
/* Init the low level hardware : GPIO, CLOCK, CORTEX...etc */
HAL_I2S_MspInit(hi2s);
}
hi2s->State = HAL_I2S_STATE_BUSY;
/* If the default value has to be written, reinitialize i2sdiv and i2sodd*/
if(hi2s->Init.AudioFreq == I2S_AUDIOFREQ_DEFAULT)
{
i2sodd = (uint32_t)0;
i2sdiv = (uint32_t)2;
}
/* If the requested audio frequency is not the default, compute the prescaler */
else
{
/* Check the frame length (For the Prescaler computing) *******************/
if(hi2s->Init.DataFormat == I2S_DATAFORMAT_16B)
{
/* Packet length is 16 bits */
packetlength = 1;
}
else
{
/* Packet length is 32 bits */
packetlength = 2;
}
/* Get the source clock value: based on System Clock value */
i2sclk = HAL_RCC_GetSysClockFreq();
/* Compute the Real divider depending on the MCLK output state, with a floating point */
if(hi2s->Init.MCLKOutput == I2S_MCLKOUTPUT_ENABLE)
{
/* MCLK output is enabled */
tmp = (uint32_t)(((((i2sclk / 256) * 10) / hi2s->Init.AudioFreq)) + 5);
}
else
{
/* MCLK output is disabled */
tmp = (uint32_t)(((((i2sclk / (32 * packetlength)) *10 ) / hi2s->Init.AudioFreq)) + 5);
}
/* Remove the flatting point */
tmp = tmp / 10;
/* Check the parity of the divider */
i2sodd = (uint32_t)(tmp & (uint32_t)1);
/* Compute the i2sdiv prescaler */
i2sdiv = (uint32_t)((tmp - i2sodd) / 2);
/* Get the Mask for the Odd bit (SPI_I2SPR[8]) register */
i2sodd = (uint32_t) (i2sodd << 8);
}
/* Test if the divider is 1 or 0 or greater than 0xFF */
if((i2sdiv < 2) || (i2sdiv > 0xFF))
{
/* Set the default values */
i2sdiv = 2;
i2sodd = 0;
}
/*----------------------- SPIx I2SCFGR & I2SPR Configuration ----------------*/
/* Clear I2SMOD, I2SE, I2SCFG, PCMSYNC, I2SSTD, CKPOL, DATLEN and CHLEN bits */
/* And configure the I2S with the I2S_InitStruct values */
MODIFY_REG( hi2s->Instance->I2SCFGR, (SPI_I2SCFGR_CHLEN | SPI_I2SCFGR_DATLEN |\
SPI_I2SCFGR_CKPOL | SPI_I2SCFGR_I2SSTD |\
SPI_I2SCFGR_PCMSYNC | SPI_I2SCFGR_I2SCFG |\
SPI_I2SCFGR_I2SE | SPI_I2SCFGR_I2SMOD),\
(SPI_I2SCFGR_I2SMOD | hi2s->Init.Mode |\
hi2s->Init.Standard | hi2s->Init.DataFormat |\
hi2s->Init.CPOL));
/* Write to SPIx I2SPR register the computed value */
hi2s->Instance->I2SPR = (uint32_t)((uint32_t)i2sdiv | (uint32_t)(i2sodd | (uint32_t)hi2s->Init.MCLKOutput));
hi2s->ErrorCode = HAL_I2S_ERROR_NONE;
hi2s->State= HAL_I2S_STATE_READY;
return HAL_OK;
}
