/* * The Clear BSD License * Copyright (c) 2015, Freescale Semiconductor, Inc. * Copyright 2016-2017 NXP * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, * are permitted (subject to the limitations in the disclaimer below) provided * that the following conditions are met: * * o Redistributions of source code must retain the above copyright notice, this list * of conditions and the following disclaimer. * * o Redistributions in binary form must reproduce the above copyright notice, this * list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * * o Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "fsl_lpspi.h" /******************************************************************************* * Definitions ******************************************************************************/ /* Component ID definition, used by tools. */ #ifndef FSL_COMPONENT_ID #define FSL_COMPONENT_ID "platform.drivers.lpspi" #endif /*! * @brief Default watermark values. * * The default watermarks are set to zero. */ enum _lpspi_default_watermarks { kLpspiDefaultTxWatermark = 0, kLpspiDefaultRxWatermark = 0, }; /*! @brief Typedef for master interrupt handler. */ typedef void (*lpspi_master_isr_t)(LPSPI_Type *base, lpspi_master_handle_t *handle); /*! @brief Typedef for slave interrupt handler. */ typedef void (*lpspi_slave_isr_t)(LPSPI_Type *base, lpspi_slave_handle_t *handle); /******************************************************************************* * Prototypes ******************************************************************************/ /*! * @brief Configures the LPSPI peripheral chip select polarity. * * This function takes in the desired peripheral chip select (Pcs) and it's corresponding desired polarity and * configures the Pcs signal to operate with the desired characteristic. * * @param base LPSPI peripheral address. * @param pcs The particular peripheral chip select (parameter value is of type lpspi_which_pcs_t) for which we wish to * apply the active high or active low characteristic. * @param activeLowOrHigh The setting for either "active high, inactive low (0)" or "active low, inactive high(1)" of * type lpspi_pcs_polarity_config_t. */ static void LPSPI_SetOnePcsPolarity(LPSPI_Type *base, lpspi_which_pcs_t pcs, lpspi_pcs_polarity_config_t activeLowOrHigh); /*! * @brief Combine the write data for 1 byte to 4 bytes. * This is not a public API. */ static uint32_t LPSPI_CombineWriteData(uint8_t *txData, uint32_t bytesEachWrite, bool isByteSwap); /*! * @brief Separate the read data for 1 byte to 4 bytes. * This is not a public API. */ static void LPSPI_SeparateReadData(uint8_t *rxData, uint32_t readData, uint32_t bytesEachRead, bool isByteSwap); /*! * @brief Master fill up the TX FIFO with data. * This is not a public API. */ static void LPSPI_MasterTransferFillUpTxFifo(LPSPI_Type *base, lpspi_master_handle_t *handle); /*! * @brief Master finish up a transfer. * It would call back if there is callback function and set the state to idle. * This is not a public API. */ static void LPSPI_MasterTransferComplete(LPSPI_Type *base, lpspi_master_handle_t *handle); /*! * @brief Slave fill up the TX FIFO with data. * This is not a public API. */ static void LPSPI_SlaveTransferFillUpTxFifo(LPSPI_Type *base, lpspi_slave_handle_t *handle); /*! * @brief Slave finish up a transfer. * It would call back if there is callback function and set the state to idle. * This is not a public API. */ static void LPSPI_SlaveTransferComplete(LPSPI_Type *base, lpspi_slave_handle_t *handle); /*! * @brief LPSPI common interrupt handler. * * @param handle pointer to s_lpspiHandle which stores the transfer state. */ static void LPSPI_CommonIRQHandler(LPSPI_Type *base, void *param); /******************************************************************************* * Variables ******************************************************************************/ /* Defines constant value arrays for the baud rate pre-scalar and scalar divider values.*/ static const uint8_t s_baudratePrescaler[] = {1, 2, 4, 8, 16, 32, 64, 128}; /*! @brief Pointers to lpspi bases for each instance. */ static LPSPI_Type *const s_lpspiBases[] = LPSPI_BASE_PTRS; /*! @brief Pointers to lpspi IRQ number for each instance. */ static const IRQn_Type s_lpspiIRQ[] = LPSPI_IRQS; #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) /*! @brief Pointers to lpspi clocks for each instance. */ static const clock_ip_name_t s_lpspiClocks[] = LPSPI_CLOCKS; #if defined(LPSPI_PERIPH_CLOCKS) static const clock_ip_name_t s_LpspiPeriphClocks[] = LPSPI_PERIPH_CLOCKS; #endif #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ /*! @brief Pointers to lpspi handles for each instance. */ static void *s_lpspiHandle[ARRAY_SIZE(s_lpspiBases)] = {NULL}; /*! @brief Pointer to master IRQ handler for each instance. */ static lpspi_master_isr_t s_lpspiMasterIsr; /*! @brief Pointer to slave IRQ handler for each instance. */ static lpspi_slave_isr_t s_lpspiSlaveIsr; /* @brief Dummy data for each instance. This data is used when user's tx buffer is NULL*/ volatile uint8_t g_lpspiDummyData[ARRAY_SIZE(s_lpspiBases)] = {0}; /********************************************************************************************************************** * Code *********************************************************************************************************************/ uint32_t LPSPI_GetInstance(LPSPI_Type *base) { uint8_t instance = 0; /* Find the instance index from base address mappings. */ for (instance = 0; instance < ARRAY_SIZE(s_lpspiBases); instance++) { if (s_lpspiBases[instance] == base) { break; } } assert(instance < ARRAY_SIZE(s_lpspiBases)); return instance; } void LPSPI_SetDummyData(LPSPI_Type *base, uint8_t dummyData) { uint32_t instance = LPSPI_GetInstance(base); g_lpspiDummyData[instance] = dummyData; } void LPSPI_MasterInit(LPSPI_Type *base, const lpspi_master_config_t *masterConfig, uint32_t srcClock_Hz) { assert(masterConfig); uint32_t tcrPrescaleValue = 0; #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) uint32_t instance = LPSPI_GetInstance(base); /* Enable LPSPI clock */ CLOCK_EnableClock(s_lpspiClocks[instance]); #if defined(LPSPI_PERIPH_CLOCKS) CLOCK_EnableClock(s_LpspiPeriphClocks[instance]); #endif #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ /* Reset to known status */ LPSPI_Reset(base); /* Set LPSPI to master */ LPSPI_SetMasterSlaveMode(base, kLPSPI_Master); /* Set specific PCS to active high or low */ LPSPI_SetOnePcsPolarity(base, masterConfig->whichPcs, masterConfig->pcsActiveHighOrLow); /* Set Configuration Register 1 related setting.*/ base->CFGR1 = (base->CFGR1 & ~(LPSPI_CFGR1_OUTCFG_MASK | LPSPI_CFGR1_PINCFG_MASK | LPSPI_CFGR1_NOSTALL_MASK)) | LPSPI_CFGR1_OUTCFG(masterConfig->dataOutConfig) | LPSPI_CFGR1_PINCFG(masterConfig->pinCfg) | LPSPI_CFGR1_NOSTALL(0); /* Set baudrate and delay times*/ LPSPI_MasterSetBaudRate(base, masterConfig->baudRate, srcClock_Hz, &tcrPrescaleValue); /* Set default watermarks */ LPSPI_SetFifoWatermarks(base, kLpspiDefaultTxWatermark, kLpspiDefaultRxWatermark); /* Set Transmit Command Register*/ base->TCR = LPSPI_TCR_CPOL(masterConfig->cpol) | LPSPI_TCR_CPHA(masterConfig->cpha) | LPSPI_TCR_LSBF(masterConfig->direction) | LPSPI_TCR_FRAMESZ(masterConfig->bitsPerFrame - 1) | LPSPI_TCR_PRESCALE(tcrPrescaleValue) | LPSPI_TCR_PCS(masterConfig->whichPcs); LPSPI_Enable(base, true); LPSPI_MasterSetDelayTimes(base, masterConfig->pcsToSckDelayInNanoSec, kLPSPI_PcsToSck, srcClock_Hz); LPSPI_MasterSetDelayTimes(base, masterConfig->lastSckToPcsDelayInNanoSec, kLPSPI_LastSckToPcs, srcClock_Hz); LPSPI_MasterSetDelayTimes(base, masterConfig->betweenTransferDelayInNanoSec, kLPSPI_BetweenTransfer, srcClock_Hz); LPSPI_SetDummyData(base, LPSPI_DUMMY_DATA); } void LPSPI_MasterGetDefaultConfig(lpspi_master_config_t *masterConfig) { assert(masterConfig); masterConfig->baudRate = 500000; masterConfig->bitsPerFrame = 8; masterConfig->cpol = kLPSPI_ClockPolarityActiveHigh; masterConfig->cpha = kLPSPI_ClockPhaseFirstEdge; masterConfig->direction = kLPSPI_MsbFirst; masterConfig->pcsToSckDelayInNanoSec = 1000000000 / masterConfig->baudRate * 2; masterConfig->lastSckToPcsDelayInNanoSec = 1000000000 / masterConfig->baudRate * 2; masterConfig->betweenTransferDelayInNanoSec = 1000000000 / masterConfig->baudRate * 2; masterConfig->whichPcs = kLPSPI_Pcs0; masterConfig->pcsActiveHighOrLow = kLPSPI_PcsActiveLow; masterConfig->pinCfg = kLPSPI_SdiInSdoOut; masterConfig->dataOutConfig = kLpspiDataOutRetained; } void LPSPI_SlaveInit(LPSPI_Type *base, const lpspi_slave_config_t *slaveConfig) { assert(slaveConfig); #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) uint32_t instance = LPSPI_GetInstance(base); /* Enable LPSPI clock */ CLOCK_EnableClock(s_lpspiClocks[instance]); #if defined(LPSPI_PERIPH_CLOCKS) CLOCK_EnableClock(s_LpspiPeriphClocks[instance]); #endif #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ /* Reset to known status */ LPSPI_Reset(base); LPSPI_SetMasterSlaveMode(base, kLPSPI_Slave); LPSPI_SetOnePcsPolarity(base, slaveConfig->whichPcs, slaveConfig->pcsActiveHighOrLow); base->CFGR1 = (base->CFGR1 & ~(LPSPI_CFGR1_OUTCFG_MASK | LPSPI_CFGR1_PINCFG_MASK)) | LPSPI_CFGR1_OUTCFG(slaveConfig->dataOutConfig) | LPSPI_CFGR1_PINCFG(slaveConfig->pinCfg); LPSPI_SetFifoWatermarks(base, kLpspiDefaultTxWatermark, kLpspiDefaultRxWatermark); base->TCR = LPSPI_TCR_CPOL(slaveConfig->cpol) | LPSPI_TCR_CPHA(slaveConfig->cpha) | LPSPI_TCR_LSBF(slaveConfig->direction) | LPSPI_TCR_FRAMESZ(slaveConfig->bitsPerFrame - 1); /* This operation will set the dummy data for edma transfer, no effect in interrupt way. */ LPSPI_SetDummyData(base, LPSPI_DUMMY_DATA); LPSPI_Enable(base, true); } void LPSPI_SlaveGetDefaultConfig(lpspi_slave_config_t *slaveConfig) { assert(slaveConfig); slaveConfig->bitsPerFrame = 8; /*!< Bits per frame, minimum 8, maximum 4096.*/ slaveConfig->cpol = kLPSPI_ClockPolarityActiveHigh; /*!< Clock polarity. */ slaveConfig->cpha = kLPSPI_ClockPhaseFirstEdge; /*!< Clock phase. */ slaveConfig->direction = kLPSPI_MsbFirst; /*!< MSB or LSB data shift direction. */ slaveConfig->whichPcs = kLPSPI_Pcs0; /*!< Desired Peripheral Chip Select (pcs) */ slaveConfig->pcsActiveHighOrLow = kLPSPI_PcsActiveLow; /*!< Desired PCS active high or low */ slaveConfig->pinCfg = kLPSPI_SdiInSdoOut; slaveConfig->dataOutConfig = kLpspiDataOutRetained; } void LPSPI_Reset(LPSPI_Type *base) { /* Reset all internal logic and registers, except the Control Register. Remains set until cleared by software.*/ base->CR |= LPSPI_CR_RST_MASK; /* Software reset doesn't reset the CR, so manual reset the FIFOs */ base->CR |= LPSPI_CR_RRF_MASK | LPSPI_CR_RTF_MASK; /* Master logic is not reset and module is disabled.*/ base->CR = 0x00U; } void LPSPI_Deinit(LPSPI_Type *base) { /* Reset to default value */ LPSPI_Reset(base); #if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) uint32_t instance = LPSPI_GetInstance(base); /* Enable LPSPI clock */ CLOCK_DisableClock(s_lpspiClocks[instance]); #if defined(LPSPI_PERIPH_CLOCKS) CLOCK_DisableClock(s_LpspiPeriphClocks[instance]); #endif #endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ } static void LPSPI_SetOnePcsPolarity(LPSPI_Type *base, lpspi_which_pcs_t pcs, lpspi_pcs_polarity_config_t activeLowOrHigh) { uint32_t cfgr1Value = 0; /* Clear the PCS polarity bit */ cfgr1Value = base->CFGR1 & ~(1U << (LPSPI_CFGR1_PCSPOL_SHIFT + pcs)); /* Configure the PCS polarity bit according to the activeLowOrHigh setting */ base->CFGR1 = cfgr1Value | ((uint32_t)activeLowOrHigh << (LPSPI_CFGR1_PCSPOL_SHIFT + pcs)); } uint32_t LPSPI_MasterSetBaudRate(LPSPI_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz, uint32_t *tcrPrescaleValue) { assert(tcrPrescaleValue); /* For master mode configuration only, if slave mode detected, return 0. * Also, the LPSPI module needs to be disabled first, if enabled, return 0 */ if ((!LPSPI_IsMaster(base)) || (base->CR & LPSPI_CR_MEN_MASK)) { return 0; } uint32_t prescaler, bestPrescaler; uint32_t scaler, bestScaler; uint32_t realBaudrate, bestBaudrate; uint32_t diff, min_diff; uint32_t desiredBaudrate = baudRate_Bps; /* find combination of prescaler and scaler resulting in baudrate closest to the * requested value */ min_diff = 0xFFFFFFFFU; /* Set to maximum divisor value bit settings so that if baud rate passed in is less * than the minimum possible baud rate, then the SPI will be configured to the lowest * possible baud rate */ bestPrescaler = 7; bestScaler = 255; bestBaudrate = 0; /* required to avoid compilation warning */ /* In all for loops, if min_diff = 0, the exit for loop*/ for (prescaler = 0; (prescaler < 8) && min_diff; prescaler++) { for (scaler = 0; (scaler < 256) && min_diff; scaler++) { realBaudrate = (srcClock_Hz / (s_baudratePrescaler[prescaler] * (scaler + 2U))); /* calculate the baud rate difference based on the conditional statement * that states that the calculated baud rate must not exceed the desired baud rate */ if (desiredBaudrate >= realBaudrate) { diff = desiredBaudrate - realBaudrate; if (min_diff > diff) { /* a better match found */ min_diff = diff; bestPrescaler = prescaler; bestScaler = scaler; bestBaudrate = realBaudrate; } } } } /* Write the best baud rate scalar to the CCR. * Note, no need to check for error since we've already checked to make sure the module is * disabled and in master mode. Also, there is a limit on the maximum divider so we will not * exceed this. */ base->CCR = (base->CCR & ~LPSPI_CCR_SCKDIV_MASK) | LPSPI_CCR_SCKDIV(bestScaler); /* return the best prescaler value for user to use later */ *tcrPrescaleValue = bestPrescaler; /* return the actual calculated baud rate */ return bestBaudrate; } void LPSPI_MasterSetDelayScaler(LPSPI_Type *base, uint32_t scaler, lpspi_delay_type_t whichDelay) { /*These settings are only relevant in master mode */ switch (whichDelay) { case kLPSPI_PcsToSck: base->CCR = (base->CCR & (~LPSPI_CCR_PCSSCK_MASK)) | LPSPI_CCR_PCSSCK(scaler); break; case kLPSPI_LastSckToPcs: base->CCR = (base->CCR & (~LPSPI_CCR_SCKPCS_MASK)) | LPSPI_CCR_SCKPCS(scaler); break; case kLPSPI_BetweenTransfer: base->CCR = (base->CCR & (~LPSPI_CCR_DBT_MASK)) | LPSPI_CCR_DBT(scaler); break; default: assert(false); break; } } uint32_t LPSPI_MasterSetDelayTimes(LPSPI_Type *base, uint32_t delayTimeInNanoSec, lpspi_delay_type_t whichDelay, uint32_t srcClock_Hz) { uint64_t realDelay, bestDelay; uint32_t scaler, bestScaler; uint32_t diff, min_diff; uint64_t initialDelayNanoSec; uint32_t clockDividedPrescaler; /* For delay between transfer, an additional scaler value is needed */ uint32_t additionalScaler = 0; /*As the RM note, the LPSPI baud rate clock is itself divided by the PRESCALE setting, which can vary between * transfers.*/ clockDividedPrescaler = srcClock_Hz / s_baudratePrescaler[(base->TCR & LPSPI_TCR_PRESCALE_MASK) >> LPSPI_TCR_PRESCALE_SHIFT]; /* Find combination of prescaler and scaler resulting in the delay closest to the requested value.*/ min_diff = 0xFFFFFFFFU; /* Initialize scaler to max value to generate the max delay */ bestScaler = 0xFFU; /* Calculate the initial (min) delay and maximum possible delay based on the specific delay as * the delay divisors are slightly different based on which delay we are configuring. */ if (whichDelay == kLPSPI_BetweenTransfer) { /* First calculate the initial, default delay, note min delay is 2 clock cycles. Due to large size of calculated values (uint64_t), we need to break up the calculation into several steps to ensure accurate calculated results */ initialDelayNanoSec = 1000000000U; initialDelayNanoSec *= 2U; initialDelayNanoSec /= clockDividedPrescaler; /* Calculate the maximum delay */ bestDelay = 1000000000U; bestDelay *= 257U; /* based on DBT+2, or 255 + 2 */ bestDelay /= clockDividedPrescaler; additionalScaler = 1U; } else { /* First calculate the initial, default delay, min delay is 1 clock cycle. Due to large size of calculated values (uint64_t), we need to break up the calculation into several steps to ensure accurate calculated results. */ initialDelayNanoSec = 1000000000U; initialDelayNanoSec /= clockDividedPrescaler; /* Calculate the maximum delay */ bestDelay = 1000000000U; bestDelay *= 256U; /* based on SCKPCS+1 or PCSSCK+1, or 255 + 1 */ bestDelay /= clockDividedPrescaler; additionalScaler = 0; } /* If the initial, default delay is already greater than the desired delay, then * set the delay to their initial value (0) and return the delay. In other words, * there is no way to decrease the delay value further. */ if (initialDelayNanoSec >= delayTimeInNanoSec) { LPSPI_MasterSetDelayScaler(base, 0, whichDelay); return initialDelayNanoSec; } /* If min_diff = 0, the exit for loop */ for (scaler = 0; (scaler < 256U) && min_diff; scaler++) { /* Calculate the real delay value as we cycle through the scaler values. Due to large size of calculated values (uint64_t), we need to break up the calculation into several steps to ensure accurate calculated results */ realDelay = 1000000000U; realDelay *= (scaler + 1 + additionalScaler); realDelay /= clockDividedPrescaler; /* calculate the delay difference based on the conditional statement * that states that the calculated delay must not be less then the desired delay */ if (realDelay >= delayTimeInNanoSec) { diff = realDelay - delayTimeInNanoSec; if (min_diff > diff) { /* a better match found */ min_diff = diff; bestScaler = scaler; bestDelay = realDelay; } } } /* write the best scaler value for the delay */ LPSPI_MasterSetDelayScaler(base, bestScaler, whichDelay); /* return the actual calculated delay value (in ns) */ return bestDelay; } /*Transactional APIs -- Master*/ void LPSPI_MasterTransferCreateHandle(LPSPI_Type *base, lpspi_master_handle_t *handle, lpspi_master_transfer_callback_t callback, void *userData) { assert(handle); /* Zero the handle. */ memset(handle, 0, sizeof(*handle)); s_lpspiHandle[LPSPI_GetInstance(base)] = handle; /* Set irq handler. */ s_lpspiMasterIsr = LPSPI_MasterTransferHandleIRQ; handle->callback = callback; handle->userData = userData; } bool LPSPI_CheckTransferArgument(lpspi_transfer_t *transfer, uint32_t bitsPerFrame, uint32_t bytesPerFrame) { assert(transfer); /* If the transfer count is zero, then return immediately.*/ if (transfer->dataSize == 0) { return false; } /* If both send buffer and receive buffer is null */ if ((!(transfer->txData)) && (!(transfer->rxData))) { return false; } /*The transfer data size should be integer multiples of bytesPerFrame if bytesPerFrame is less than or equal to 4 . *For bytesPerFrame greater than 4 situation: *the transfer data size should be equal to bytesPerFrame if the bytesPerFrame is not integer multiples of 4 , *otherwise , the transfer data size can be integer multiples of bytesPerFrame. */ if (bytesPerFrame <= 4) { if ((transfer->dataSize % bytesPerFrame) != 0) { return false; } } else { if ((bytesPerFrame % 4U) != 0) { if (transfer->dataSize != bytesPerFrame) { return false; } } else { if ((transfer->dataSize % bytesPerFrame) != 0) { return false; } } } return true; } status_t LPSPI_MasterTransferBlocking(LPSPI_Type *base, lpspi_transfer_t *transfer) { assert(transfer); uint32_t bitsPerFrame = ((base->TCR & LPSPI_TCR_FRAMESZ_MASK) >> LPSPI_TCR_FRAMESZ_SHIFT) + 1; uint32_t bytesPerFrame = (bitsPerFrame + 7) / 8; uint32_t temp = 0U; uint8_t dummyData = g_lpspiDummyData[LPSPI_GetInstance(base)]; if (!LPSPI_CheckTransferArgument(transfer, bitsPerFrame, bytesPerFrame)) { return kStatus_InvalidArgument; } /* Check that LPSPI is not busy.*/ if (LPSPI_GetStatusFlags(base) & kLPSPI_ModuleBusyFlag) { return kStatus_LPSPI_Busy; } uint8_t *txData = transfer->txData; uint8_t *rxData = transfer->rxData; uint32_t txRemainingByteCount = transfer->dataSize; uint32_t rxRemainingByteCount = transfer->dataSize; uint8_t bytesEachWrite; uint8_t bytesEachRead; uint32_t readData = 0; uint32_t wordToSend = ((uint32_t)dummyData) | ((uint32_t)dummyData << 8) | ((uint32_t)dummyData << 16) | ((uint32_t)dummyData << 24); /*The TX and RX FIFO sizes are always the same*/ uint32_t fifoSize = LPSPI_GetRxFifoSize(base); uint32_t whichPcs = (transfer->configFlags & LPSPI_MASTER_PCS_MASK) >> LPSPI_MASTER_PCS_SHIFT; bool isPcsContinuous = (bool)(transfer->configFlags & kLPSPI_MasterPcsContinuous); bool isRxMask = false; bool isByteSwap = (bool)(transfer->configFlags & kLPSPI_MasterByteSwap); LPSPI_FlushFifo(base, true, true); LPSPI_ClearStatusFlags(base, kLPSPI_AllStatusFlag); if (!rxData) { isRxMask = true; } LPSPI_Enable(base, false); base->CFGR1 &= (~LPSPI_CFGR1_NOSTALL_MASK); /* Check if using 3-wire mode and the txData is NULL, set the output pin to tristated. */ temp = base->CFGR1; temp &= LPSPI_CFGR1_PINCFG_MASK; if ((temp == LPSPI_CFGR1_PINCFG(kLPSPI_SdiInSdiOut)) || (temp == LPSPI_CFGR1_PINCFG(kLPSPI_SdoInSdoOut))) { if (!txData) { base->CFGR1 |= LPSPI_CFGR1_OUTCFG_MASK; } /* The 3-wire mode can't send and receive data at the same time. */ if ((txData) && (rxData)) { return kStatus_InvalidArgument; } } LPSPI_Enable(base, true); base->TCR = (base->TCR & ~(LPSPI_TCR_CONT_MASK | LPSPI_TCR_CONTC_MASK | LPSPI_TCR_RXMSK_MASK | LPSPI_TCR_PCS_MASK)) | LPSPI_TCR_CONT(isPcsContinuous) | LPSPI_TCR_CONTC(0) | LPSPI_TCR_RXMSK(isRxMask) | LPSPI_TCR_PCS(whichPcs); if (bytesPerFrame <= 4) { bytesEachWrite = bytesPerFrame; bytesEachRead = bytesPerFrame; } else { bytesEachWrite = 4; bytesEachRead = 4; } /*Write the TX data until txRemainingByteCount is equal to 0 */ while (txRemainingByteCount > 0) { if (txRemainingByteCount < bytesEachWrite) { bytesEachWrite = txRemainingByteCount; } /*Wait until TX FIFO is not full*/ while (LPSPI_GetTxFifoCount(base) == fifoSize) { } if (txData) { wordToSend = LPSPI_CombineWriteData(txData, bytesEachWrite, isByteSwap); txData += bytesEachWrite; } LPSPI_WriteData(base, wordToSend); txRemainingByteCount -= bytesEachWrite; /*Check whether there is RX data in RX FIFO . Read out the RX data so that the RX FIFO would not overrun.*/ if (rxData) { while (LPSPI_GetRxFifoCount(base)) { readData = LPSPI_ReadData(base); if (rxRemainingByteCount < bytesEachRead) { bytesEachRead = rxRemainingByteCount; } LPSPI_SeparateReadData(rxData, readData, bytesEachRead, isByteSwap); rxData += bytesEachRead; rxRemainingByteCount -= bytesEachRead; } } } /* After write all the data in TX FIFO , should write the TCR_CONTC to 0 to de-assert the PCS. Note that TCR * register also use the TX FIFO. */ while ((LPSPI_GetTxFifoCount(base) == fifoSize)) { } base->TCR = (base->TCR & ~(LPSPI_TCR_CONTC_MASK)); /*Read out the RX data in FIFO*/ if (rxData) { while (rxRemainingByteCount > 0) { while (LPSPI_GetRxFifoCount(base)) { readData = LPSPI_ReadData(base); if (rxRemainingByteCount < bytesEachRead) { bytesEachRead = rxRemainingByteCount; } LPSPI_SeparateReadData(rxData, readData, bytesEachRead, isByteSwap); rxData += bytesEachRead; rxRemainingByteCount -= bytesEachRead; } } } else { /* If no RX buffer, then transfer is not complete until transfer complete flag sets */ while (!(LPSPI_GetStatusFlags(base) & kLPSPI_TransferCompleteFlag)) { } } return kStatus_Success; } status_t LPSPI_MasterTransferNonBlocking(LPSPI_Type *base, lpspi_master_handle_t *handle, lpspi_transfer_t *transfer) { assert(handle); assert(transfer); uint32_t bitsPerFrame = ((base->TCR & LPSPI_TCR_FRAMESZ_MASK) >> LPSPI_TCR_FRAMESZ_SHIFT) + 1; uint32_t bytesPerFrame = (bitsPerFrame + 7) / 8; uint32_t temp = 0U; uint8_t dummyData = g_lpspiDummyData[LPSPI_GetInstance(base)]; if (!LPSPI_CheckTransferArgument(transfer, bitsPerFrame, bytesPerFrame)) { return kStatus_InvalidArgument; } /* Check that we're not busy.*/ if (handle->state == kLPSPI_Busy) { return kStatus_LPSPI_Busy; } handle->state = kLPSPI_Busy; bool isRxMask = false; uint8_t txWatermark; uint32_t whichPcs = (transfer->configFlags & LPSPI_MASTER_PCS_MASK) >> LPSPI_MASTER_PCS_SHIFT; handle->txData = transfer->txData; handle->rxData = transfer->rxData; handle->txRemainingByteCount = transfer->dataSize; handle->rxRemainingByteCount = transfer->dataSize; handle->totalByteCount = transfer->dataSize; handle->writeTcrInIsr = false; handle->writeRegRemainingTimes = (transfer->dataSize / bytesPerFrame) * ((bytesPerFrame + 3) / 4); handle->readRegRemainingTimes = handle->writeRegRemainingTimes; handle->txBuffIfNull = ((uint32_t)dummyData) | ((uint32_t)dummyData << 8) | ((uint32_t)dummyData << 16) | ((uint32_t)dummyData << 24); /*The TX and RX FIFO sizes are always the same*/ handle->fifoSize = LPSPI_GetRxFifoSize(base); handle->isPcsContinuous = (bool)(transfer->configFlags & kLPSPI_MasterPcsContinuous); handle->isByteSwap = (bool)(transfer->configFlags & kLPSPI_MasterByteSwap); /*Set the RX and TX watermarks to reduce the ISR times.*/ if (handle->fifoSize > 1) { txWatermark = 1; handle->rxWatermark = handle->fifoSize - 2; } else { txWatermark = 0; handle->rxWatermark = 0; } LPSPI_SetFifoWatermarks(base, txWatermark, handle->rxWatermark); LPSPI_Enable(base, false); /*Transfers will stall when transmit FIFO is empty or receive FIFO is full. */ base->CFGR1 &= (~LPSPI_CFGR1_NOSTALL_MASK); /* Check if using 3-wire mode and the txData is NULL, set the output pin to tristated. */ temp = base->CFGR1; temp &= LPSPI_CFGR1_PINCFG_MASK; if ((temp == LPSPI_CFGR1_PINCFG(kLPSPI_SdiInSdiOut)) || (temp == LPSPI_CFGR1_PINCFG(kLPSPI_SdoInSdoOut))) { if (!handle->txData) { base->CFGR1 |= LPSPI_CFGR1_OUTCFG_MASK; } /* The 3-wire mode can't send and receive data at the same time. */ if ((handle->txData) && (handle->rxData)) { return kStatus_InvalidArgument; } } LPSPI_Enable(base, true); /*Flush FIFO , clear status , disable all the inerrupts.*/ LPSPI_FlushFifo(base, true, true); LPSPI_ClearStatusFlags(base, kLPSPI_AllStatusFlag); LPSPI_DisableInterrupts(base, kLPSPI_AllInterruptEnable); /* If there is not rxData , can mask the receive data (receive data is not stored in receive FIFO). * For master transfer , we'd better not masked the transmit data in TCR since the transfer flow is hard to * controlled by software.*/ if (handle->rxData == NULL) { isRxMask = true; handle->rxRemainingByteCount = 0; } base->TCR = (base->TCR & ~(LPSPI_TCR_CONT_MASK | LPSPI_TCR_CONTC_MASK | LPSPI_TCR_RXMSK_MASK | LPSPI_TCR_PCS_MASK)) | LPSPI_TCR_CONT(handle->isPcsContinuous) | LPSPI_TCR_CONTC(0) | LPSPI_TCR_RXMSK(isRxMask) | LPSPI_TCR_PCS(whichPcs); /*Calculate the bytes for write/read the TX/RX register each time*/ if (bytesPerFrame <= 4) { handle->bytesEachWrite = bytesPerFrame; handle->bytesEachRead = bytesPerFrame; } else { handle->bytesEachWrite = 4; handle->bytesEachRead = 4; } /* Enable the NVIC for LPSPI peripheral. Note that below code is useless if the LPSPI interrupt is in INTMUX , * and you should also enable the INTMUX interupt in your application. */ EnableIRQ(s_lpspiIRQ[LPSPI_GetInstance(base)]); /*TCR is also shared the FIFO , so wait for TCR written.*/ while (LPSPI_GetTxFifoCount(base) != 0) { } /*Fill up the TX data in FIFO */ LPSPI_MasterTransferFillUpTxFifo(base, handle); /* Since SPI is a synchronous interface, we only need to enable the RX interrupt if there is RX data. * The IRQ handler will get the status of RX and TX interrupt flags. */ if (handle->rxData) { /*Set rxWatermark to (readRegRemainingTimes-1) if readRegRemainingTimes less than rxWatermark. Otherwise there *is not RX interrupt for the last datas because the RX count is not greater than rxWatermark. */ if ((handle->readRegRemainingTimes) <= handle->rxWatermark) { base->FCR = (base->FCR & (~LPSPI_FCR_RXWATER_MASK)) | LPSPI_FCR_RXWATER(handle->readRegRemainingTimes - 1); } LPSPI_EnableInterrupts(base, kLPSPI_RxInterruptEnable); } else { LPSPI_EnableInterrupts(base, kLPSPI_TxInterruptEnable); } return kStatus_Success; } static void LPSPI_MasterTransferFillUpTxFifo(LPSPI_Type *base, lpspi_master_handle_t *handle) { assert(handle); uint32_t wordToSend = 0; /* Make sure the difference in remaining TX and RX byte counts does not exceed FIFO depth * and that the number of TX FIFO entries does not exceed the FIFO depth. * But no need to make the protection if there is no rxData. */ while ((LPSPI_GetTxFifoCount(base) < (handle->fifoSize)) && (((handle->readRegRemainingTimes - handle->writeRegRemainingTimes) < handle->fifoSize) || (handle->rxData == NULL))) { if (handle->txRemainingByteCount < handle->bytesEachWrite) { handle->bytesEachWrite = handle->txRemainingByteCount; } if (handle->txData) { wordToSend = LPSPI_CombineWriteData(handle->txData, handle->bytesEachWrite, handle->isByteSwap); handle->txData += handle->bytesEachWrite; } else { wordToSend = handle->txBuffIfNull; } /*Write the word to TX register*/ LPSPI_WriteData(base, wordToSend); /*Decrease the write TX register times.*/ --handle->writeRegRemainingTimes; /*Decrease the remaining TX byte count.*/ handle->txRemainingByteCount -= handle->bytesEachWrite; if (handle->txRemainingByteCount == 0) { /* If PCS is continuous, update TCR to de-assert PCS */ if (handle->isPcsContinuous) { /* Only write to the TCR if the FIFO has room */ if ((LPSPI_GetTxFifoCount(base) < (handle->fifoSize))) { base->TCR = (base->TCR & ~(LPSPI_TCR_CONTC_MASK)); handle->writeTcrInIsr = false; } /* Else, set a global flag to tell the ISR to do write to the TCR */ else { handle->writeTcrInIsr = true; } } break; } } } static void LPSPI_MasterTransferComplete(LPSPI_Type *base, lpspi_master_handle_t *handle) { assert(handle); /* Disable interrupt requests*/ LPSPI_DisableInterrupts(base, kLPSPI_AllInterruptEnable); handle->state = kLPSPI_Idle; if (handle->callback) { handle->callback(base, handle, kStatus_Success, handle->userData); } } status_t LPSPI_MasterTransferGetCount(LPSPI_Type *base, lpspi_master_handle_t *handle, size_t *count) { assert(handle); if (!count) { return kStatus_InvalidArgument; } /* Catch when there is not an active transfer. */ if (handle->state != kLPSPI_Busy) { *count = 0; return kStatus_NoTransferInProgress; } size_t remainingByte; if (handle->rxData) { remainingByte = handle->rxRemainingByteCount; } else { remainingByte = handle->txRemainingByteCount; } *count = handle->totalByteCount - remainingByte; return kStatus_Success; } void LPSPI_MasterTransferAbort(LPSPI_Type *base, lpspi_master_handle_t *handle) { assert(handle); /* Disable interrupt requests*/ LPSPI_DisableInterrupts(base, kLPSPI_AllInterruptEnable); LPSPI_Reset(base); handle->state = kLPSPI_Idle; handle->txRemainingByteCount = 0; handle->rxRemainingByteCount = 0; } void LPSPI_MasterTransferHandleIRQ(LPSPI_Type *base, lpspi_master_handle_t *handle) { assert(handle); uint32_t readData; if (handle->rxData != NULL) { if (handle->rxRemainingByteCount) { /* First, disable the interrupts to avoid potentially triggering another interrupt * while reading out the RX FIFO as more data may be coming into the RX FIFO. We'll * re-enable the interrupts based on the LPSPI state after reading out the FIFO. */ LPSPI_DisableInterrupts(base, kLPSPI_RxInterruptEnable); while ((LPSPI_GetRxFifoCount(base)) && (handle->rxRemainingByteCount)) { /*Read out the data*/ readData = LPSPI_ReadData(base); /*Decrease the read RX register times.*/ --handle->readRegRemainingTimes; if (handle->rxRemainingByteCount < handle->bytesEachRead) { handle->bytesEachRead = handle->rxRemainingByteCount; } LPSPI_SeparateReadData(handle->rxData, readData, handle->bytesEachRead, handle->isByteSwap); handle->rxData += handle->bytesEachRead; /*Decrease the remaining RX byte count.*/ handle->rxRemainingByteCount -= handle->bytesEachRead; } /* Re-enable the interrupts only if rxCount indicates there is more data to receive, * else we may get a spurious interrupt. * */ if (handle->rxRemainingByteCount) { /* Set the TDF and RDF interrupt enables simultaneously to avoid race conditions */ LPSPI_EnableInterrupts(base, kLPSPI_RxInterruptEnable); } } /*Set rxWatermark to (readRegRemainingTimes-1) if readRegRemainingTimes less than rxWatermark. Otherwise there *is not RX interrupt for the last datas because the RX count is not greater than rxWatermark. */ if ((handle->readRegRemainingTimes) <= (handle->rxWatermark)) { base->FCR = (base->FCR & (~LPSPI_FCR_RXWATER_MASK)) | LPSPI_FCR_RXWATER((handle->readRegRemainingTimes > 1) ? (handle->readRegRemainingTimes - 1U) : (0U)); } } if (handle->txRemainingByteCount) { LPSPI_MasterTransferFillUpTxFifo(base, handle); } else { if ((LPSPI_GetTxFifoCount(base) < (handle->fifoSize))) { if ((handle->isPcsContinuous) && (handle->writeTcrInIsr)) { base->TCR = (base->TCR & ~(LPSPI_TCR_CONTC_MASK)); handle->writeTcrInIsr = false; } } } if ((handle->txRemainingByteCount == 0) && (handle->rxRemainingByteCount == 0) && (!handle->writeTcrInIsr)) { /* If no RX buffer, then transfer is not complete until transfer complete flag sets */ if (handle->rxData == NULL) { if (LPSPI_GetStatusFlags(base) & kLPSPI_TransferCompleteFlag) { /* Complete the transfer and disable the interrupts */ LPSPI_MasterTransferComplete(base, handle); } else { LPSPI_EnableInterrupts(base, kLPSPI_TransferCompleteInterruptEnable); LPSPI_DisableInterrupts(base, kLPSPI_TxInterruptEnable | kLPSPI_RxInterruptEnable); } } else { /* Complete the transfer and disable the interrupts */ LPSPI_MasterTransferComplete(base, handle); } } } /*Transactional APIs -- Slave*/ void LPSPI_SlaveTransferCreateHandle(LPSPI_Type *base, lpspi_slave_handle_t *handle, lpspi_slave_transfer_callback_t callback, void *userData) { assert(handle); /* Zero the handle. */ memset(handle, 0, sizeof(*handle)); s_lpspiHandle[LPSPI_GetInstance(base)] = handle; /* Set irq handler. */ s_lpspiSlaveIsr = LPSPI_SlaveTransferHandleIRQ; handle->callback = callback; handle->userData = userData; } status_t LPSPI_SlaveTransferNonBlocking(LPSPI_Type *base, lpspi_slave_handle_t *handle, lpspi_transfer_t *transfer) { assert(handle); assert(transfer); uint32_t bitsPerFrame = ((base->TCR & LPSPI_TCR_FRAMESZ_MASK) >> LPSPI_TCR_FRAMESZ_SHIFT) + 1; uint32_t bytesPerFrame = (bitsPerFrame + 7) / 8; uint32_t temp = 0U; if (!LPSPI_CheckTransferArgument(transfer, bitsPerFrame, bytesPerFrame)) { return kStatus_InvalidArgument; } /* Check that we're not busy.*/ if (handle->state == kLPSPI_Busy) { return kStatus_LPSPI_Busy; } handle->state = kLPSPI_Busy; bool isRxMask = false; bool isTxMask = false; uint32_t whichPcs = (transfer->configFlags & LPSPI_SLAVE_PCS_MASK) >> LPSPI_SLAVE_PCS_SHIFT; handle->txData = transfer->txData; handle->rxData = transfer->rxData; handle->txRemainingByteCount = transfer->dataSize; handle->rxRemainingByteCount = transfer->dataSize; handle->totalByteCount = transfer->dataSize; handle->writeRegRemainingTimes = (transfer->dataSize / bytesPerFrame) * ((bytesPerFrame + 3) / 4); handle->readRegRemainingTimes = handle->writeRegRemainingTimes; /*The TX and RX FIFO sizes are always the same*/ handle->fifoSize = LPSPI_GetRxFifoSize(base); handle->isByteSwap = (bool)(transfer->configFlags & kLPSPI_SlaveByteSwap); /*Set the RX and TX watermarks to reduce the ISR times.*/ uint8_t txWatermark; if (handle->fifoSize > 1) { txWatermark = 1; handle->rxWatermark = handle->fifoSize - 2; } else { txWatermark = 0; handle->rxWatermark = 0; } LPSPI_SetFifoWatermarks(base, txWatermark, handle->rxWatermark); /* Check if using 3-wire mode and the txData is NULL, set the output pin to tristated. */ temp = base->CFGR1; temp &= LPSPI_CFGR1_PINCFG_MASK; if ((temp == LPSPI_CFGR1_PINCFG(kLPSPI_SdiInSdiOut)) || (temp == LPSPI_CFGR1_PINCFG(kLPSPI_SdoInSdoOut))) { if (!handle->txData) { LPSPI_Enable(base, false); base->CFGR1 |= LPSPI_CFGR1_OUTCFG_MASK; LPSPI_Enable(base, true); } /* The 3-wire mode can't send and receive data at the same time. */ if ((handle->txData) && (handle->rxData)) { return kStatus_InvalidArgument; } } /*Flush FIFO , clear status , disable all the inerrupts.*/ LPSPI_FlushFifo(base, true, true); LPSPI_ClearStatusFlags(base, kLPSPI_AllStatusFlag); LPSPI_DisableInterrupts(base, kLPSPI_AllInterruptEnable); /*If there is not rxData , can mask the receive data (receive data is not stored in receive FIFO).*/ if (handle->rxData == NULL) { isRxMask = true; handle->rxRemainingByteCount = 0; } /*If there is not txData , can mask the transmit data (no data is loaded from transmit FIFO and output pin * is tristated). */ if (handle->txData == NULL) { isTxMask = true; handle->txRemainingByteCount = 0; } base->TCR = (base->TCR & ~(LPSPI_TCR_CONT_MASK | LPSPI_TCR_CONTC_MASK | LPSPI_TCR_RXMSK_MASK | LPSPI_TCR_TXMSK_MASK | LPSPI_TCR_PCS_MASK)) | LPSPI_TCR_CONT(0) | LPSPI_TCR_CONTC(0) | LPSPI_TCR_RXMSK(isRxMask) | LPSPI_TCR_TXMSK(isTxMask) | LPSPI_TCR_PCS(whichPcs); /*Calculate the bytes for write/read the TX/RX register each time*/ if (bytesPerFrame <= 4) { handle->bytesEachWrite = bytesPerFrame; handle->bytesEachRead = bytesPerFrame; } else { handle->bytesEachWrite = 4; handle->bytesEachRead = 4; } /* Enable the NVIC for LPSPI peripheral. Note that below code is useless if the LPSPI interrupt is in INTMUX , * and you should also enable the INTMUX interupt in your application. */ EnableIRQ(s_lpspiIRQ[LPSPI_GetInstance(base)]); /*TCR is also shared the FIFO , so wait for TCR written.*/ while (LPSPI_GetTxFifoCount(base) != 0) { } /*Fill up the TX data in FIFO */ if (handle->txData) { LPSPI_SlaveTransferFillUpTxFifo(base, handle); } /* Since SPI is a synchronous interface, we only need to enable the RX interrupt if there is RX data. * The IRQ handler will get the status of RX and TX interrupt flags. */ if (handle->rxData) { /*Set rxWatermark to (readRegRemainingTimes-1) if readRegRemainingTimes less than rxWatermark. Otherwise there *is not RX interrupt for the last datas because the RX count is not greater than rxWatermark. */ if ((handle->readRegRemainingTimes) <= handle->rxWatermark) { base->FCR = (base->FCR & (~LPSPI_FCR_RXWATER_MASK)) | LPSPI_FCR_RXWATER(handle->readRegRemainingTimes - 1); } LPSPI_EnableInterrupts(base, kLPSPI_RxInterruptEnable); } else { LPSPI_EnableInterrupts(base, kLPSPI_TxInterruptEnable); } if (handle->rxData) { /* RX FIFO overflow request enable */ LPSPI_EnableInterrupts(base, kLPSPI_ReceiveErrorInterruptEnable); } if (handle->txData) { /* TX FIFO underflow request enable */ LPSPI_EnableInterrupts(base, kLPSPI_TransmitErrorInterruptEnable); } return kStatus_Success; } static void LPSPI_SlaveTransferFillUpTxFifo(LPSPI_Type *base, lpspi_slave_handle_t *handle) { assert(handle); uint32_t wordToSend = 0; while (LPSPI_GetTxFifoCount(base) < (handle->fifoSize)) { if (handle->txRemainingByteCount < handle->bytesEachWrite) { handle->bytesEachWrite = handle->txRemainingByteCount; } wordToSend = LPSPI_CombineWriteData(handle->txData, handle->bytesEachWrite, handle->isByteSwap); handle->txData += handle->bytesEachWrite; /*Decrease the remaining TX byte count.*/ handle->txRemainingByteCount -= handle->bytesEachWrite; /*Write the word to TX register*/ LPSPI_WriteData(base, wordToSend); if (handle->txRemainingByteCount == 0) { break; } } } static void LPSPI_SlaveTransferComplete(LPSPI_Type *base, lpspi_slave_handle_t *handle) { assert(handle); status_t status = 0; /* Disable interrupt requests*/ LPSPI_DisableInterrupts(base, kLPSPI_AllInterruptEnable); if (handle->state == kLPSPI_Error) { status = kStatus_LPSPI_Error; } else { status = kStatus_Success; } handle->state = kLPSPI_Idle; if (handle->callback) { handle->callback(base, handle, status, handle->userData); } } status_t LPSPI_SlaveTransferGetCount(LPSPI_Type *base, lpspi_slave_handle_t *handle, size_t *count) { assert(handle); if (!count) { return kStatus_InvalidArgument; } /* Catch when there is not an active transfer. */ if (handle->state != kLPSPI_Busy) { *count = 0; return kStatus_NoTransferInProgress; } size_t remainingByte; if (handle->rxData) { remainingByte = handle->rxRemainingByteCount; } else { remainingByte = handle->txRemainingByteCount; } *count = handle->totalByteCount - remainingByte; return kStatus_Success; } void LPSPI_SlaveTransferAbort(LPSPI_Type *base, lpspi_slave_handle_t *handle) { assert(handle); /* Disable interrupt requests*/ LPSPI_DisableInterrupts(base, kLPSPI_TxInterruptEnable | kLPSPI_RxInterruptEnable); LPSPI_Reset(base); handle->state = kLPSPI_Idle; handle->txRemainingByteCount = 0; handle->rxRemainingByteCount = 0; } void LPSPI_SlaveTransferHandleIRQ(LPSPI_Type *base, lpspi_slave_handle_t *handle) { assert(handle); uint32_t readData; /* variable to store word read from RX FIFO */ uint32_t wordToSend; /* variable to store word to write to TX FIFO */ if (handle->rxData != NULL) { if (handle->rxRemainingByteCount > 0) { while (LPSPI_GetRxFifoCount(base)) { /*Read out the data*/ readData = LPSPI_ReadData(base); /*Decrease the read RX register times.*/ --handle->readRegRemainingTimes; if (handle->rxRemainingByteCount < handle->bytesEachRead) { handle->bytesEachRead = handle->rxRemainingByteCount; } LPSPI_SeparateReadData(handle->rxData, readData, handle->bytesEachRead, handle->isByteSwap); handle->rxData += handle->bytesEachRead; /*Decrease the remaining RX byte count.*/ handle->rxRemainingByteCount -= handle->bytesEachRead; if ((handle->txRemainingByteCount > 0) && (handle->txData != NULL)) { if (handle->txRemainingByteCount < handle->bytesEachWrite) { handle->bytesEachWrite = handle->txRemainingByteCount; } wordToSend = LPSPI_CombineWriteData(handle->txData, handle->bytesEachWrite, handle->isByteSwap); handle->txData += handle->bytesEachWrite; /*Decrease the remaining TX byte count.*/ handle->txRemainingByteCount -= handle->bytesEachWrite; /*Write the word to TX register*/ LPSPI_WriteData(base, wordToSend); } if (handle->rxRemainingByteCount == 0) { break; } } } /*Set rxWatermark to (readRegRemainingTimes-1) if readRegRemainingTimes less than rxWatermark. Otherwise there *is not RX interrupt for the last datas because the RX count is not greater than rxWatermark. */ if ((handle->readRegRemainingTimes) <= (handle->rxWatermark)) { base->FCR = (base->FCR & (~LPSPI_FCR_RXWATER_MASK)) | LPSPI_FCR_RXWATER((handle->readRegRemainingTimes > 1) ? (handle->readRegRemainingTimes - 1U) : (0U)); } } else if ((handle->txRemainingByteCount) && (handle->txData != NULL)) { LPSPI_SlaveTransferFillUpTxFifo(base, handle); } else { __NOP(); } if ((handle->txRemainingByteCount == 0) && (handle->rxRemainingByteCount == 0)) { /* If no RX buffer, then transfer is not complete until transfer complete flag sets and the TX FIFO empty*/ if (handle->rxData == NULL) { if ((LPSPI_GetStatusFlags(base) & kLPSPI_FrameCompleteFlag) && (LPSPI_GetTxFifoCount(base) == 0)) { /* Complete the transfer and disable the interrupts */ LPSPI_SlaveTransferComplete(base, handle); } else { LPSPI_ClearStatusFlags(base, kLPSPI_FrameCompleteFlag); LPSPI_EnableInterrupts(base, kLPSPI_FrameCompleteInterruptEnable); LPSPI_DisableInterrupts(base, kLPSPI_TxInterruptEnable | kLPSPI_RxInterruptEnable); } } else { /* Complete the transfer and disable the interrupts */ LPSPI_SlaveTransferComplete(base, handle); } } /* Catch tx fifo underflow conditions, service only if tx under flow interrupt enabled */ if ((LPSPI_GetStatusFlags(base) & kLPSPI_TransmitErrorFlag) && (base->IER & LPSPI_IER_TEIE_MASK)) { LPSPI_ClearStatusFlags(base, kLPSPI_TransmitErrorFlag); /* Change state to error and clear flag */ if (handle->txData) { handle->state = kLPSPI_Error; } handle->errorCount++; } /* Catch rx fifo overflow conditions, service only if rx over flow interrupt enabled */ if ((LPSPI_GetStatusFlags(base) & kLPSPI_ReceiveErrorFlag) && (base->IER & LPSPI_IER_REIE_MASK)) { LPSPI_ClearStatusFlags(base, kLPSPI_ReceiveErrorFlag); /* Change state to error and clear flag */ if (handle->txData) { handle->state = kLPSPI_Error; } handle->errorCount++; } } static uint32_t LPSPI_CombineWriteData(uint8_t *txData, uint32_t bytesEachWrite, bool isByteSwap) { assert(txData); uint32_t wordToSend = 0; switch (bytesEachWrite) { case 1: wordToSend = *txData; ++txData; break; case 2: if (!isByteSwap) { wordToSend = *txData; ++txData; wordToSend |= (unsigned)(*txData) << 8U; ++txData; } else { wordToSend = (unsigned)(*txData) << 8U; ++txData; wordToSend |= *txData; ++txData; } break; case 3: if (!isByteSwap) { wordToSend = *txData; ++txData; wordToSend |= (unsigned)(*txData) << 8U; ++txData; wordToSend |= (unsigned)(*txData) << 16U; ++txData; } else { wordToSend = (unsigned)(*txData) << 16U; ++txData; wordToSend |= (unsigned)(*txData) << 8U; ++txData; wordToSend |= *txData; ++txData; } break; case 4: if (!isByteSwap) { wordToSend = *txData; ++txData; wordToSend |= (unsigned)(*txData) << 8U; ++txData; wordToSend |= (unsigned)(*txData) << 16U; ++txData; wordToSend |= (unsigned)(*txData) << 24U; ++txData; } else { wordToSend = (unsigned)(*txData) << 24U; ++txData; wordToSend |= (unsigned)(*txData) << 16U; ++txData; wordToSend |= (unsigned)(*txData) << 8U; ++txData; wordToSend |= *txData; ++txData; } break; default: assert(false); break; } return wordToSend; } static void LPSPI_SeparateReadData(uint8_t *rxData, uint32_t readData, uint32_t bytesEachRead, bool isByteSwap) { assert(rxData); switch (bytesEachRead) { case 1: *rxData = readData; ++rxData; break; case 2: if (!isByteSwap) { *rxData = readData; ++rxData; *rxData = readData >> 8; ++rxData; } else { *rxData = readData >> 8; ++rxData; *rxData = readData; ++rxData; } break; case 3: if (!isByteSwap) { *rxData = readData; ++rxData; *rxData = readData >> 8; ++rxData; *rxData = readData >> 16; ++rxData; } else { *rxData = readData >> 16; ++rxData; *rxData = readData >> 8; ++rxData; *rxData = readData; ++rxData; } break; case 4: if (!isByteSwap) { *rxData = readData; ++rxData; *rxData = readData >> 8; ++rxData; *rxData = readData >> 16; ++rxData; *rxData = readData >> 24; ++rxData; } else { *rxData = readData >> 24; ++rxData; *rxData = readData >> 16; ++rxData; *rxData = readData >> 8; ++rxData; *rxData = readData; ++rxData; } break; default: assert(false); break; } } static void LPSPI_CommonIRQHandler(LPSPI_Type *base, void *param) { if (LPSPI_IsMaster(base)) { s_lpspiMasterIsr(base, (lpspi_master_handle_t *)param); } else { s_lpspiSlaveIsr(base, (lpspi_slave_handle_t *)param); } /* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping exception return operation might vector to incorrect interrupt */ #if defined __CORTEX_M && (__CORTEX_M == 4U) __DSB(); #endif } #if defined(LPSPI0) void LPSPI0_DriverIRQHandler(void) { assert(s_lpspiHandle[0]); LPSPI_CommonIRQHandler(LPSPI0, s_lpspiHandle[0]); } #endif #if defined(LPSPI1) void LPSPI1_DriverIRQHandler(void) { assert(s_lpspiHandle[1]); LPSPI_CommonIRQHandler(LPSPI1, s_lpspiHandle[1]); } #endif #if defined(LPSPI2) void LPSPI2_DriverIRQHandler(void) { assert(s_lpspiHandle[2]); LPSPI_CommonIRQHandler(LPSPI2, s_lpspiHandle[2]); } #endif #if defined(LPSPI3) void LPSPI3_DriverIRQHandler(void) { assert(s_lpspiHandle[3]); LPSPI_CommonIRQHandler(LPSPI3, s_lpspiHandle[3]); } #endif #if defined(LPSPI4) void LPSPI4_DriverIRQHandler(void) { assert(s_lpspiHandle[4]); LPSPI_CommonIRQHandler(LPSPI4, s_lpspiHandle[4]); } #endif #if defined(LPSPI5) void LPSPI5_DriverIRQHandler(void) { assert(s_lpspiHandle[5]); LPSPI_CommonIRQHandler(LPSPI5, s_lpspiHandle[5]); } #endif #if defined(DMA__LPSPI0) void DMA_SPI0_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI0)]); LPSPI_CommonIRQHandler(DMA__LPSPI0, s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI0)]); } #endif #if defined(DMA__LPSPI1) void DMA_SPI1_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI1)]); LPSPI_CommonIRQHandler(DMA__LPSPI1, s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI1)]); } #endif #if defined(DMA__LPSPI2) void DMA_SPI2_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI2)]); LPSPI_CommonIRQHandler(DMA__LPSPI2, s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI2)]); } #endif #if defined(DMA__LPSPI3) void DMA_SPI3_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI3)]); LPSPI_CommonIRQHandler(DMA__LPSPI3, s_lpspiHandle[LPSPI_GetInstance(DMA__LPSPI3)]); } #endif #if defined(ADMA__LPSPI0) void ADMA_SPI0_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI0)]); LPSPI_CommonIRQHandler(ADMA__LPSPI0, s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI0)]); } #endif #if defined(ADMA__LPSPI1) void ADMA_SPI1_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI1)]); LPSPI_CommonIRQHandler(ADMA__LPSPI1, s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI1)]); } #endif #if defined(ADMA__LPSPI2) void ADMA_SPI2_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI2)]); LPSPI_CommonIRQHandler(ADMA__LPSPI2, s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI2)]); } #endif #if defined(ADMA__LPSPI3) void ADMA_SPI3_INT_DriverIRQHandler(void) { assert(s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI3)]); LPSPI_CommonIRQHandler(ADMA__LPSPI3, s_lpspiHandle[LPSPI_GetInstance(ADMA__LPSPI3)]); } #endif