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rt-thread-official/bsp/imxrt/libraries/MIMXRT1050/MIMXRT1052/drivers/fsl_flexio_i2s.c

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/*
* Copyright (c) 2015, Freescale Semiconductor, Inc.
* Copyright 2016-2018 NXP
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "fsl_flexio_i2s.h"
/* Component ID definition, used by tools. */
#ifndef FSL_COMPONENT_ID
#define FSL_COMPONENT_ID "platform.drivers.flexio_i2s"
#endif
/*******************************************************************************
* Definitations
******************************************************************************/
enum _sai_transfer_state
{
kFLEXIO_I2S_Busy = 0x0U, /*!< FLEXIO_I2S is busy */
kFLEXIO_I2S_Idle, /*!< Transfer is done. */
};
/*******************************************************************************
* Prototypes
******************************************************************************/
/*!
* @brief Receive a piece of data in non-blocking way.
*
* @param base FLEXIO I2S base pointer
* @param bitWidth How many bits in a audio word, usually 8/16/24/32 bits.
* @param buffer Pointer to the data to be read.
* @param size Bytes to be read.
*/
static void FLEXIO_I2S_ReadNonBlocking(FLEXIO_I2S_Type *base, uint8_t bitWidth, uint8_t *rxData, size_t size);
/*!
* @brief sends a piece of data in non-blocking way.
*
* @param base FLEXIO I2S base pointer
* @param bitWidth How many bits in a audio word, usually 8/16/24/32 bits.
* @param buffer Pointer to the data to be written.
* @param size Bytes to be written.
*/
static void FLEXIO_I2S_WriteNonBlocking(FLEXIO_I2S_Type *base, uint8_t bitWidth, uint8_t *txData, size_t size);
/*******************************************************************************
* Variables
******************************************************************************/
/*******************************************************************************
* Code
******************************************************************************/
static uint32_t FLEXIO_I2S_GetInstance(FLEXIO_I2S_Type *base)
{
return FLEXIO_GetInstance(base->flexioBase);
}
static void FLEXIO_I2S_WriteNonBlocking(FLEXIO_I2S_Type *base, uint8_t bitWidth, uint8_t *txData, size_t size)
{
uint32_t i = 0;
uint8_t j = 0;
uint8_t bytesPerWord = bitWidth / 8U;
uint32_t data = 0;
uint32_t temp = 0;
for (i = 0; i < size / bytesPerWord; i++)
{
for (j = 0; j < bytesPerWord; j++)
{
temp = (uint32_t)(*txData);
data |= (temp << (8U * j));
txData++;
}
base->flexioBase->SHIFTBUFBIS[base->txShifterIndex] = data << (32U - bitWidth);
data = 0;
}
}
static void FLEXIO_I2S_ReadNonBlocking(FLEXIO_I2S_Type *base, uint8_t bitWidth, uint8_t *rxData, size_t size)
{
uint32_t i = 0;
uint8_t j = 0;
uint8_t bytesPerWord = bitWidth / 8U;
uint32_t data = 0;
for (i = 0; i < size / bytesPerWord; i++)
{
data = (base->flexioBase->SHIFTBUFBIS[base->rxShifterIndex]);
for (j = 0; j < bytesPerWord; j++)
{
*rxData = (data >> (8U * j)) & 0xFF;
rxData++;
}
}
}
/*!
* brief Initializes the FlexIO I2S.
*
* This API configures FlexIO pins and shifter to I2S and configures the FlexIO I2S with a configuration structure.
* The configuration structure can be filled by the user, or be set with default values by
* FLEXIO_I2S_GetDefaultConfig().
*
* note This API should be called at the beginning of the application to use
* the FlexIO I2S driver. Otherwise, any access to the FlexIO I2S module can cause hard fault
* because the clock is not enabled.
*
* param base FlexIO I2S base pointer
* param config FlexIO I2S configure structure.
*/
void FLEXIO_I2S_Init(FLEXIO_I2S_Type *base, const flexio_i2s_config_t *config)
{
assert(base && config);
flexio_shifter_config_t shifterConfig = {0};
flexio_timer_config_t timerConfig = {0};
#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL)
/* Ungate flexio clock. */
CLOCK_EnableClock(s_flexioClocks[FLEXIO_I2S_GetInstance(base)]);
#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */
/* reset Flexio */
FLEXIO_Reset(base->flexioBase);
/* Set shifter for I2S Tx data */
shifterConfig.timerSelect = base->bclkTimerIndex;
shifterConfig.pinSelect = base->txPinIndex;
shifterConfig.timerPolarity = config->txTimerPolarity;
shifterConfig.pinConfig = kFLEXIO_PinConfigOutput;
shifterConfig.pinPolarity = config->txPinPolarity;
shifterConfig.shifterMode = kFLEXIO_ShifterModeTransmit;
shifterConfig.inputSource = kFLEXIO_ShifterInputFromPin;
shifterConfig.shifterStop = kFLEXIO_ShifterStopBitDisable;
if (config->masterSlave == kFLEXIO_I2S_Master)
{
shifterConfig.shifterStart = kFLEXIO_ShifterStartBitDisabledLoadDataOnShift;
}
else
{
shifterConfig.shifterStart = kFLEXIO_ShifterStartBitDisabledLoadDataOnEnable;
}
FLEXIO_SetShifterConfig(base->flexioBase, base->txShifterIndex, &shifterConfig);
/* Set shifter for I2S Rx Data */
shifterConfig.timerSelect = base->bclkTimerIndex;
shifterConfig.pinSelect = base->rxPinIndex;
shifterConfig.timerPolarity = config->rxTimerPolarity;
shifterConfig.pinConfig = kFLEXIO_PinConfigOutputDisabled;
shifterConfig.pinPolarity = config->rxPinPolarity;
shifterConfig.shifterMode = kFLEXIO_ShifterModeReceive;
shifterConfig.inputSource = kFLEXIO_ShifterInputFromPin;
shifterConfig.shifterStop = kFLEXIO_ShifterStopBitDisable;
shifterConfig.shifterStart = kFLEXIO_ShifterStartBitDisabledLoadDataOnEnable;
FLEXIO_SetShifterConfig(base->flexioBase, base->rxShifterIndex, &shifterConfig);
/* Set Timer to I2S frame sync */
if (config->masterSlave == kFLEXIO_I2S_Master)
{
timerConfig.triggerSelect = FLEXIO_TIMER_TRIGGER_SEL_PININPUT(base->txPinIndex);
timerConfig.triggerPolarity = kFLEXIO_TimerTriggerPolarityActiveHigh;
timerConfig.triggerSource = kFLEXIO_TimerTriggerSourceExternal;
timerConfig.pinConfig = kFLEXIO_PinConfigOutput;
timerConfig.pinSelect = base->fsPinIndex;
timerConfig.pinPolarity = config->fsPinPolarity;
timerConfig.timerMode = kFLEXIO_TimerModeSingle16Bit;
timerConfig.timerOutput = kFLEXIO_TimerOutputOneNotAffectedByReset;
timerConfig.timerDecrement = kFLEXIO_TimerDecSrcOnFlexIOClockShiftTimerOutput;
timerConfig.timerReset = kFLEXIO_TimerResetNever;
timerConfig.timerDisable = kFLEXIO_TimerDisableNever;
timerConfig.timerEnable = kFLEXIO_TimerEnableOnPrevTimerEnable;
timerConfig.timerStart = kFLEXIO_TimerStartBitDisabled;
timerConfig.timerStop = kFLEXIO_TimerStopBitDisabled;
}
else
{
timerConfig.triggerSelect = FLEXIO_TIMER_TRIGGER_SEL_PININPUT(base->bclkPinIndex);
timerConfig.triggerPolarity = kFLEXIO_TimerTriggerPolarityActiveHigh;
timerConfig.triggerSource = kFLEXIO_TimerTriggerSourceInternal;
timerConfig.pinConfig = kFLEXIO_PinConfigOutputDisabled;
timerConfig.pinSelect = base->fsPinIndex;
timerConfig.pinPolarity = config->fsPinPolarity;
timerConfig.timerMode = kFLEXIO_TimerModeSingle16Bit;
timerConfig.timerOutput = kFLEXIO_TimerOutputOneNotAffectedByReset;
timerConfig.timerDecrement = kFLEXIO_TimerDecSrcOnTriggerInputShiftTriggerInput;
timerConfig.timerReset = kFLEXIO_TimerResetNever;
timerConfig.timerDisable = kFLEXIO_TimerDisableOnTimerCompare;
timerConfig.timerEnable = kFLEXIO_TimerEnableOnPinRisingEdge;
timerConfig.timerStart = kFLEXIO_TimerStartBitDisabled;
timerConfig.timerStop = kFLEXIO_TimerStopBitDisabled;
}
FLEXIO_SetTimerConfig(base->flexioBase, base->fsTimerIndex, &timerConfig);
/* Set Timer to I2S bit clock */
if (config->masterSlave == kFLEXIO_I2S_Master)
{
timerConfig.triggerSelect = FLEXIO_TIMER_TRIGGER_SEL_SHIFTnSTAT(base->txShifterIndex);
timerConfig.triggerPolarity = kFLEXIO_TimerTriggerPolarityActiveLow;
timerConfig.triggerSource = kFLEXIO_TimerTriggerSourceInternal;
timerConfig.pinSelect = base->bclkPinIndex;
timerConfig.pinConfig = kFLEXIO_PinConfigOutput;
timerConfig.pinPolarity = config->bclkPinPolarity;
timerConfig.timerMode = kFLEXIO_TimerModeDual8BitBaudBit;
timerConfig.timerOutput = kFLEXIO_TimerOutputOneNotAffectedByReset;
timerConfig.timerDecrement = kFLEXIO_TimerDecSrcOnFlexIOClockShiftTimerOutput;
timerConfig.timerReset = kFLEXIO_TimerResetNever;
timerConfig.timerDisable = kFLEXIO_TimerDisableNever;
timerConfig.timerEnable = kFLEXIO_TimerEnableOnTriggerHigh;
timerConfig.timerStart = kFLEXIO_TimerStartBitEnabled;
timerConfig.timerStop = kFLEXIO_TimerStopBitDisabled;
}
else
{
timerConfig.triggerSelect = FLEXIO_TIMER_TRIGGER_SEL_TIMn(base->fsTimerIndex);
timerConfig.triggerPolarity = kFLEXIO_TimerTriggerPolarityActiveHigh;
timerConfig.triggerSource = kFLEXIO_TimerTriggerSourceInternal;
timerConfig.pinSelect = base->bclkPinIndex;
timerConfig.pinConfig = kFLEXIO_PinConfigOutputDisabled;
timerConfig.pinPolarity = config->bclkPinPolarity;
timerConfig.timerMode = kFLEXIO_TimerModeSingle16Bit;
timerConfig.timerOutput = kFLEXIO_TimerOutputOneNotAffectedByReset;
timerConfig.timerDecrement = kFLEXIO_TimerDecSrcOnPinInputShiftPinInput;
timerConfig.timerReset = kFLEXIO_TimerResetNever;
timerConfig.timerDisable = kFLEXIO_TimerDisableOnTimerCompareTriggerLow;
timerConfig.timerEnable = kFLEXIO_TimerEnableOnPinRisingEdgeTriggerHigh;
timerConfig.timerStart = kFLEXIO_TimerStartBitDisabled;
timerConfig.timerStop = kFLEXIO_TimerStopBitDisabled;
}
FLEXIO_SetTimerConfig(base->flexioBase, base->bclkTimerIndex, &timerConfig);
/* If enable flexio I2S */
if (config->enableI2S)
{
base->flexioBase->CTRL |= FLEXIO_CTRL_FLEXEN_MASK;
}
else
{
base->flexioBase->CTRL &= ~FLEXIO_CTRL_FLEXEN_MASK;
}
}
/*!
* brief Sets the FlexIO I2S configuration structure to default values.
*
* The purpose of this API is to get the configuration structure initialized for use in FLEXIO_I2S_Init().
* Users may use the initialized structure unchanged in FLEXIO_I2S_Init() or modify
* some fields of the structure before calling FLEXIO_I2S_Init().
*
* param config pointer to master configuration structure
*/
void FLEXIO_I2S_GetDefaultConfig(flexio_i2s_config_t *config)
{
/* Initializes the configure structure to zero. */
memset(config, 0, sizeof(*config));
config->masterSlave = kFLEXIO_I2S_Master;
config->enableI2S = true;
config->txPinPolarity = kFLEXIO_PinActiveHigh;
config->rxPinPolarity = kFLEXIO_PinActiveHigh;
config->bclkPinPolarity = kFLEXIO_PinActiveHigh;
config->fsPinPolarity = kFLEXIO_PinActiveLow;
config->txTimerPolarity = kFLEXIO_ShifterTimerPolarityOnPositive;
config->rxTimerPolarity = kFLEXIO_ShifterTimerPolarityOnNegitive;
}
/*!
* brief De-initializes the FlexIO I2S.
*
* Calling this API resets the FlexIO I2S shifter and timer config. After calling this API,
* call the FLEXO_I2S_Init to use the FlexIO I2S module.
*
* param base FlexIO I2S base pointer
*/
void FLEXIO_I2S_Deinit(FLEXIO_I2S_Type *base)
{
base->flexioBase->SHIFTCFG[base->txShifterIndex] = 0;
base->flexioBase->SHIFTCTL[base->txShifterIndex] = 0;
base->flexioBase->SHIFTCFG[base->rxShifterIndex] = 0;
base->flexioBase->SHIFTCTL[base->rxShifterIndex] = 0;
base->flexioBase->TIMCFG[base->fsTimerIndex] = 0;
base->flexioBase->TIMCMP[base->fsTimerIndex] = 0;
base->flexioBase->TIMCTL[base->fsTimerIndex] = 0;
base->flexioBase->TIMCFG[base->bclkTimerIndex] = 0;
base->flexioBase->TIMCMP[base->bclkTimerIndex] = 0;
base->flexioBase->TIMCTL[base->bclkTimerIndex] = 0;
}
/*!
* brief Enables the FlexIO I2S interrupt.
*
* This function enables the FlexIO UART interrupt.
*
* param base Pointer to FLEXIO_I2S_Type structure
* param mask interrupt source
*/
void FLEXIO_I2S_EnableInterrupts(FLEXIO_I2S_Type *base, uint32_t mask)
{
if (mask & kFLEXIO_I2S_TxDataRegEmptyInterruptEnable)
{
FLEXIO_EnableShifterStatusInterrupts(base->flexioBase, 1U << base->txShifterIndex);
}
if (mask & kFLEXIO_I2S_RxDataRegFullInterruptEnable)
{
FLEXIO_EnableShifterStatusInterrupts(base->flexioBase, 1U << base->rxShifterIndex);
}
}
/*!
* brief Gets the FlexIO I2S status flags.
*
* param base Pointer to FLEXIO_I2S_Type structure
* return Status flag, which are ORed by the enumerators in the _flexio_i2s_status_flags.
*/
uint32_t FLEXIO_I2S_GetStatusFlags(FLEXIO_I2S_Type *base)
{
uint32_t status = 0;
status = ((FLEXIO_GetShifterStatusFlags(base->flexioBase) & (1U << base->txShifterIndex)) >> base->txShifterIndex);
status |=
(((FLEXIO_GetShifterStatusFlags(base->flexioBase) & (1U << base->rxShifterIndex)) >> (base->rxShifterIndex))
<< 1U);
return status;
}
/*!
* brief Disables the FlexIO I2S interrupt.
*
* This function enables the FlexIO UART interrupt.
*
* param base pointer to FLEXIO_I2S_Type structure
* param mask interrupt source
*/
void FLEXIO_I2S_DisableInterrupts(FLEXIO_I2S_Type *base, uint32_t mask)
{
if (mask & kFLEXIO_I2S_TxDataRegEmptyInterruptEnable)
{
FLEXIO_DisableShifterStatusInterrupts(base->flexioBase, 1U << base->txShifterIndex);
}
if (mask & kFLEXIO_I2S_RxDataRegFullInterruptEnable)
{
FLEXIO_DisableShifterStatusInterrupts(base->flexioBase, 1U << base->rxShifterIndex);
}
}
/*!
* brief Configures the FlexIO I2S audio format in master mode.
*
* Audio format can be changed in run-time of FlexIO I2S. This function configures the sample rate and audio data
* format to be transferred.
*
* param base Pointer to FLEXIO_I2S_Type structure
* param format Pointer to FlexIO I2S audio data format structure.
* param srcClock_Hz I2S master clock source frequency in Hz.
*/
void FLEXIO_I2S_MasterSetFormat(FLEXIO_I2S_Type *base, flexio_i2s_format_t *format, uint32_t srcClock_Hz)
{
uint32_t timDiv = srcClock_Hz / (format->sampleRate_Hz * format->bitWidth * 2U);
uint32_t bclkDiv = 0;
/* Shall keep bclk and fs div an integer */
if (timDiv % 2)
{
timDiv += 1U;
}
/* Set Frame sync timer cmp */
base->flexioBase->TIMCMP[base->fsTimerIndex] = FLEXIO_TIMCMP_CMP(format->bitWidth * timDiv - 1U);
/* Set bit clock timer cmp */
bclkDiv = ((timDiv / 2U - 1U) | ((format->bitWidth * 2U - 1U) << 8U));
base->flexioBase->TIMCMP[base->bclkTimerIndex] = FLEXIO_TIMCMP_CMP(bclkDiv);
}
/*!
* brief Configures the FlexIO I2S audio format in slave mode.
*
* Audio format can be changed in run-time of FlexIO I2S. This function configures the sample rate and audio data
* format to be transferred.
*
* param base Pointer to FLEXIO_I2S_Type structure
* param format Pointer to FlexIO I2S audio data format structure.
*/
void FLEXIO_I2S_SlaveSetFormat(FLEXIO_I2S_Type *base, flexio_i2s_format_t *format)
{
/* Set Frame sync timer cmp */
base->flexioBase->TIMCMP[base->fsTimerIndex] = FLEXIO_TIMCMP_CMP(format->bitWidth * 4U - 3U);
/* Set bit clock timer cmp */
base->flexioBase->TIMCMP[base->bclkTimerIndex] = FLEXIO_TIMCMP_CMP(format->bitWidth * 2U - 1U);
}
/*!
* brief Sends data using a blocking method.
*
* note This function blocks via polling until data is ready to be sent.
*
* param base FlexIO I2S base pointer.
* param bitWidth How many bits in a audio word, usually 8/16/24/32 bits.
* param txData Pointer to the data to be written.
* param size Bytes to be written.
*/
void FLEXIO_I2S_WriteBlocking(FLEXIO_I2S_Type *base, uint8_t bitWidth, uint8_t *txData, size_t size)
{
uint32_t i = 0;
uint8_t bytesPerWord = bitWidth / 8U;
for (i = 0; i < size / bytesPerWord; i++)
{
/* Wait until it can write data */
while ((FLEXIO_I2S_GetStatusFlags(base) & kFLEXIO_I2S_TxDataRegEmptyFlag) == 0)
{
}
FLEXIO_I2S_WriteNonBlocking(base, bitWidth, txData, bytesPerWord);
txData += bytesPerWord;
}
/* Wait until the last data is sent */
while ((FLEXIO_I2S_GetStatusFlags(base) & kFLEXIO_I2S_TxDataRegEmptyFlag) == 0)
{
}
}
/*!
* brief Receives a piece of data using a blocking method.
*
* note This function blocks via polling until data is ready to be sent.
*
* param base FlexIO I2S base pointer
* param bitWidth How many bits in a audio word, usually 8/16/24/32 bits.
* param rxData Pointer to the data to be read.
* param size Bytes to be read.
*/
void FLEXIO_I2S_ReadBlocking(FLEXIO_I2S_Type *base, uint8_t bitWidth, uint8_t *rxData, size_t size)
{
uint32_t i = 0;
uint8_t bytesPerWord = bitWidth / 8U;
for (i = 0; i < size / bytesPerWord; i++)
{
/* Wait until data is received */
while (!(FLEXIO_GetShifterStatusFlags(base->flexioBase) & (1U << base->rxShifterIndex)))
{
}
FLEXIO_I2S_ReadNonBlocking(base, bitWidth, rxData, bytesPerWord);
rxData += bytesPerWord;
}
}
/*!
* brief Initializes the FlexIO I2S handle.
*
* This function initializes the FlexIO I2S handle which can be used for other
* FlexIO I2S transactional APIs. Call this API once to get the
* initialized handle.
*
* param base Pointer to FLEXIO_I2S_Type structure
* param handle Pointer to flexio_i2s_handle_t structure to store the transfer state.
* param callback FlexIO I2S callback function, which is called while finished a block.
* param userData User parameter for the FlexIO I2S callback.
*/
void FLEXIO_I2S_TransferTxCreateHandle(FLEXIO_I2S_Type *base,
flexio_i2s_handle_t *handle,
flexio_i2s_callback_t callback,
void *userData)
{
assert(handle);
IRQn_Type flexio_irqs[] = FLEXIO_IRQS;
/* Zero the handle. */
memset(handle, 0, sizeof(*handle));
/* Store callback and user data. */
handle->callback = callback;
handle->userData = userData;
/* Save the context in global variables to support the double weak mechanism. */
FLEXIO_RegisterHandleIRQ(base, handle, FLEXIO_I2S_TransferTxHandleIRQ);
/* Set the TX/RX state. */
handle->state = kFLEXIO_I2S_Idle;
/* Enable interrupt in NVIC. */
EnableIRQ(flexio_irqs[FLEXIO_I2S_GetInstance(base)]);
}
/*!
* brief Initializes the FlexIO I2S receive handle.
*
* This function initializes the FlexIO I2S handle which can be used for other
* FlexIO I2S transactional APIs. Call this API once to get the
* initialized handle.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure to store the transfer state.
* param callback FlexIO I2S callback function, which is called while finished a block.
* param userData User parameter for the FlexIO I2S callback.
*/
void FLEXIO_I2S_TransferRxCreateHandle(FLEXIO_I2S_Type *base,
flexio_i2s_handle_t *handle,
flexio_i2s_callback_t callback,
void *userData)
{
assert(handle);
IRQn_Type flexio_irqs[] = FLEXIO_IRQS;
/* Zero the handle. */
memset(handle, 0, sizeof(*handle));
/* Store callback and user data. */
handle->callback = callback;
handle->userData = userData;
/* Save the context in global variables to support the double weak mechanism. */
FLEXIO_RegisterHandleIRQ(base, handle, FLEXIO_I2S_TransferRxHandleIRQ);
/* Set the TX/RX state. */
handle->state = kFLEXIO_I2S_Idle;
/* Enable interrupt in NVIC. */
EnableIRQ(flexio_irqs[FLEXIO_I2S_GetInstance(base)]);
}
/*!
* brief Configures the FlexIO I2S audio format.
*
* Audio format can be changed at run-time of FlexIO I2S. This function configures the sample rate and audio data
* format to be transferred.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle FlexIO I2S handle pointer.
* param format Pointer to audio data format structure.
* param srcClock_Hz FlexIO I2S bit clock source frequency in Hz. This parameter should be 0 while in slave mode.
*/
void FLEXIO_I2S_TransferSetFormat(FLEXIO_I2S_Type *base,
flexio_i2s_handle_t *handle,
flexio_i2s_format_t *format,
uint32_t srcClock_Hz)
{
assert(handle && format);
/* Set the bitWidth to handle */
handle->bitWidth = format->bitWidth;
/* Set sample rate */
if (srcClock_Hz != 0)
{
/* It is master */
FLEXIO_I2S_MasterSetFormat(base, format, srcClock_Hz);
}
else
{
FLEXIO_I2S_SlaveSetFormat(base, format);
}
}
/*!
* brief Performs an interrupt non-blocking send transfer on FlexIO I2S.
*
* note The API returns immediately after transfer initiates.
* Call FLEXIO_I2S_GetRemainingBytes to poll the transfer status and check whether
* the transfer is finished. If the return status is 0, the transfer is finished.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure which stores the transfer state
* param xfer Pointer to flexio_i2s_transfer_t structure
* retval kStatus_Success Successfully start the data transmission.
* retval kStatus_FLEXIO_I2S_TxBusy Previous transmission still not finished, data not all written to TX register yet.
* retval kStatus_InvalidArgument The input parameter is invalid.
*/
status_t FLEXIO_I2S_TransferSendNonBlocking(FLEXIO_I2S_Type *base,
flexio_i2s_handle_t *handle,
flexio_i2s_transfer_t *xfer)
{
assert(handle);
/* Check if the queue is full */
if (handle->queue[handle->queueUser].data)
{
return kStatus_FLEXIO_I2S_QueueFull;
}
if ((xfer->dataSize == 0) || (xfer->data == NULL))
{
return kStatus_InvalidArgument;
}
/* Add into queue */
handle->queue[handle->queueUser].data = xfer->data;
handle->queue[handle->queueUser].dataSize = xfer->dataSize;
handle->transferSize[handle->queueUser] = xfer->dataSize;
handle->queueUser = (handle->queueUser + 1) % FLEXIO_I2S_XFER_QUEUE_SIZE;
/* Set the state to busy */
handle->state = kFLEXIO_I2S_Busy;
FLEXIO_I2S_EnableInterrupts(base, kFLEXIO_I2S_TxDataRegEmptyInterruptEnable);
/* Enable Tx transfer */
FLEXIO_I2S_Enable(base, true);
return kStatus_Success;
}
/*!
* brief Performs an interrupt non-blocking receive transfer on FlexIO I2S.
*
* note The API returns immediately after transfer initiates.
* Call FLEXIO_I2S_GetRemainingBytes to poll the transfer status to check whether
* the transfer is finished. If the return status is 0, the transfer is finished.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure which stores the transfer state
* param xfer Pointer to flexio_i2s_transfer_t structure
* retval kStatus_Success Successfully start the data receive.
* retval kStatus_FLEXIO_I2S_RxBusy Previous receive still not finished.
* retval kStatus_InvalidArgument The input parameter is invalid.
*/
status_t FLEXIO_I2S_TransferReceiveNonBlocking(FLEXIO_I2S_Type *base,
flexio_i2s_handle_t *handle,
flexio_i2s_transfer_t *xfer)
{
assert(handle);
/* Check if the queue is full */
if (handle->queue[handle->queueUser].data)
{
return kStatus_FLEXIO_I2S_QueueFull;
}
if ((xfer->dataSize == 0) || (xfer->data == NULL))
{
return kStatus_InvalidArgument;
}
/* Add into queue */
handle->queue[handle->queueUser].data = xfer->data;
handle->queue[handle->queueUser].dataSize = xfer->dataSize;
handle->transferSize[handle->queueUser] = xfer->dataSize;
handle->queueUser = (handle->queueUser + 1) % FLEXIO_I2S_XFER_QUEUE_SIZE;
/* Set state to busy */
handle->state = kFLEXIO_I2S_Busy;
/* Enable interrupt */
FLEXIO_I2S_EnableInterrupts(base, kFLEXIO_I2S_RxDataRegFullInterruptEnable);
/* Enable Rx transfer */
FLEXIO_I2S_Enable(base, true);
return kStatus_Success;
}
/*!
* brief Aborts the current send.
*
* note This API can be called at any time when interrupt non-blocking transfer initiates
* to abort the transfer in a early time.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure which stores the transfer state
*/
void FLEXIO_I2S_TransferAbortSend(FLEXIO_I2S_Type *base, flexio_i2s_handle_t *handle)
{
assert(handle);
/* Stop Tx transfer and disable interrupt */
FLEXIO_I2S_DisableInterrupts(base, kFLEXIO_I2S_TxDataRegEmptyInterruptEnable);
handle->state = kFLEXIO_I2S_Idle;
/* Clear the queue */
memset(handle->queue, 0, sizeof(flexio_i2s_transfer_t) * FLEXIO_I2S_XFER_QUEUE_SIZE);
handle->queueDriver = 0;
handle->queueUser = 0;
}
/*!
* brief Aborts the current receive.
*
* note This API can be called at any time when interrupt non-blocking transfer initiates
* to abort the transfer in a early time.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure which stores the transfer state
*/
void FLEXIO_I2S_TransferAbortReceive(FLEXIO_I2S_Type *base, flexio_i2s_handle_t *handle)
{
assert(handle);
/* Stop rx transfer and disable interrupt */
FLEXIO_I2S_DisableInterrupts(base, kFLEXIO_I2S_RxDataRegFullInterruptEnable);
handle->state = kFLEXIO_I2S_Idle;
/* Clear the queue */
memset(handle->queue, 0, sizeof(flexio_i2s_transfer_t) * FLEXIO_I2S_XFER_QUEUE_SIZE);
handle->queueDriver = 0;
handle->queueUser = 0;
}
/*!
* brief Gets the remaining bytes to be sent.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure which stores the transfer state
* param count Bytes sent.
* retval kStatus_Success Succeed get the transfer count.
* retval kStatus_NoTransferInProgress There is not a non-blocking transaction currently in progress.
*/
status_t FLEXIO_I2S_TransferGetSendCount(FLEXIO_I2S_Type *base, flexio_i2s_handle_t *handle, size_t *count)
{
assert(handle);
status_t status = kStatus_Success;
if (handle->state != kFLEXIO_I2S_Busy)
{
status = kStatus_NoTransferInProgress;
}
else
{
*count = (handle->transferSize[handle->queueDriver] - handle->queue[handle->queueDriver].dataSize);
}
return status;
}
/*!
* brief Gets the remaining bytes to be received.
*
* param base Pointer to FLEXIO_I2S_Type structure.
* param handle Pointer to flexio_i2s_handle_t structure which stores the transfer state
* return count Bytes received.
* retval kStatus_Success Succeed get the transfer count.
* retval kStatus_NoTransferInProgress There is not a non-blocking transaction currently in progress.
*/
status_t FLEXIO_I2S_TransferGetReceiveCount(FLEXIO_I2S_Type *base, flexio_i2s_handle_t *handle, size_t *count)
{
assert(handle);
status_t status = kStatus_Success;
if (handle->state != kFLEXIO_I2S_Busy)
{
status = kStatus_NoTransferInProgress;
}
else
{
*count = (handle->transferSize[handle->queueDriver] - handle->queue[handle->queueDriver].dataSize);
}
return status;
}
/*!
* brief Tx interrupt handler.
*
* param i2sBase Pointer to FLEXIO_I2S_Type structure.
* param i2sHandle Pointer to flexio_i2s_handle_t structure
*/
void FLEXIO_I2S_TransferTxHandleIRQ(void *i2sBase, void *i2sHandle)
{
assert(i2sHandle);
flexio_i2s_handle_t *handle = (flexio_i2s_handle_t *)i2sHandle;
FLEXIO_I2S_Type *base = (FLEXIO_I2S_Type *)i2sBase;
uint8_t *buffer = handle->queue[handle->queueDriver].data;
uint8_t dataSize = handle->bitWidth / 8U;
/* Handle error */
if (FLEXIO_GetShifterErrorFlags(base->flexioBase) & (1U << base->txShifterIndex))
{
FLEXIO_ClearShifterErrorFlags(base->flexioBase, (1U << base->txShifterIndex));
}
/* Handle transfer */
if (((FLEXIO_I2S_GetStatusFlags(base) & kFLEXIO_I2S_TxDataRegEmptyFlag) != 0) &&
(handle->queue[handle->queueDriver].data != NULL))
{
FLEXIO_I2S_WriteNonBlocking(base, handle->bitWidth, buffer, dataSize);
/* Update internal counter */
handle->queue[handle->queueDriver].dataSize -= dataSize;
handle->queue[handle->queueDriver].data += dataSize;
}
/* If finished a blcok, call the callback function */
if ((handle->queue[handle->queueDriver].dataSize == 0U) && (handle->queue[handle->queueDriver].data != NULL))
{
memset(&handle->queue[handle->queueDriver], 0, sizeof(flexio_i2s_transfer_t));
handle->queueDriver = (handle->queueDriver + 1) % FLEXIO_I2S_XFER_QUEUE_SIZE;
if (handle->callback)
{
(handle->callback)(base, handle, kStatus_Success, handle->userData);
}
}
/* If all data finished, just stop the transfer */
if (handle->queue[handle->queueDriver].data == NULL)
{
FLEXIO_I2S_TransferAbortSend(base, handle);
}
}
/*!
* brief Rx interrupt handler.
*
* param i2sBase Pointer to FLEXIO_I2S_Type structure.
* param i2sHandle Pointer to flexio_i2s_handle_t structure.
*/
void FLEXIO_I2S_TransferRxHandleIRQ(void *i2sBase, void *i2sHandle)
{
assert(i2sHandle);
flexio_i2s_handle_t *handle = (flexio_i2s_handle_t *)i2sHandle;
FLEXIO_I2S_Type *base = (FLEXIO_I2S_Type *)i2sBase;
uint8_t *buffer = handle->queue[handle->queueDriver].data;
uint8_t dataSize = handle->bitWidth / 8U;
/* Handle transfer */
if (((FLEXIO_I2S_GetStatusFlags(base) & kFLEXIO_I2S_RxDataRegFullFlag) != 0) &&
(handle->queue[handle->queueDriver].data != NULL))
{
FLEXIO_I2S_ReadNonBlocking(base, handle->bitWidth, buffer, dataSize);
/* Update internal state */
handle->queue[handle->queueDriver].dataSize -= dataSize;
handle->queue[handle->queueDriver].data += dataSize;
}
/* If finished a blcok, call the callback function */
if ((handle->queue[handle->queueDriver].dataSize == 0U) && (handle->queue[handle->queueDriver].data != NULL))
{
memset(&handle->queue[handle->queueDriver], 0, sizeof(flexio_i2s_transfer_t));
handle->queueDriver = (handle->queueDriver + 1) % FLEXIO_I2S_XFER_QUEUE_SIZE;
if (handle->callback)
{
(handle->callback)(base, handle, kStatus_Success, handle->userData);
}
}
/* If all data finished, just stop the transfer */
if (handle->queue[handle->queueDriver].data == NULL)
{
FLEXIO_I2S_TransferAbortReceive(base, handle);
}
}
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