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- #include "fsl_i2c_edma.h"
- typedef struct _i2c_master_edma_private_handle
- {
- I2C_Type *base;
- i2c_master_edma_handle_t *handle;
- } i2c_master_edma_private_handle_t;
- enum _i2c_master_dma_transfer_states
- {
- kIdleState = 0x0U,
- kTransferDataState = 0x1U,
- };
- enum _i2c_flag_constants
- {
- #if defined(FSL_FEATURE_I2C_HAS_START_STOP_DETECT) && FSL_FEATURE_I2C_HAS_START_STOP_DETECT
- kClearFlags = kI2C_ArbitrationLostFlag | kI2C_IntPendingFlag | kI2C_StartDetectFlag | kI2C_StopDetectFlag,
- #elif defined(FSL_FEATURE_I2C_HAS_STOP_DETECT) && FSL_FEATURE_I2C_HAS_STOP_DETECT
- kClearFlags = kI2C_ArbitrationLostFlag | kI2C_IntPendingFlag | kI2C_StopDetectFlag,
- #else
- kClearFlags = kI2C_ArbitrationLostFlag | kI2C_IntPendingFlag,
- #endif
- };
- static void I2C_MasterTransferCallbackEDMA(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds);
- static status_t I2C_CheckAndClearError(I2C_Type *base, uint32_t status);
- static void I2C_MasterTransferEDMAConfig(I2C_Type *base, i2c_master_edma_handle_t *handle);
- static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base,
- i2c_master_edma_handle_t *handle,
- i2c_master_transfer_t *xfer);
- extern uint32_t I2C_GetInstance(I2C_Type *base);
- static i2c_master_edma_private_handle_t s_edmaPrivateHandle[FSL_FEATURE_SOC_I2C_COUNT];
- static void I2C_MasterTransferCallbackEDMA(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds)
- {
- i2c_master_edma_private_handle_t *i2cPrivateHandle = (i2c_master_edma_private_handle_t *)userData;
- status_t result = kStatus_Success;
-
- I2C_EnableDMA(i2cPrivateHandle->base, false);
-
- if (!(i2cPrivateHandle->handle->transfer.flags & kI2C_TransferNoStopFlag))
- {
- if (i2cPrivateHandle->handle->transfer.direction == kI2C_Read)
- {
-
- i2cPrivateHandle->base->C1 |= I2C_C1_TXAK_MASK;
-
- while (!(i2cPrivateHandle->base->S & kI2C_TransferCompleteFlag))
- {
- }
-
- result = I2C_MasterStop(i2cPrivateHandle->base);
-
- *(i2cPrivateHandle->handle->transfer.data + i2cPrivateHandle->handle->transfer.dataSize - 1) =
- i2cPrivateHandle->base->D;
- }
- else
- {
-
- while (!(i2cPrivateHandle->base->S & kI2C_TransferCompleteFlag))
- {
- }
-
- result = I2C_MasterStop(i2cPrivateHandle->base);
- }
- }
- else
- {
- if (i2cPrivateHandle->handle->transfer.direction == kI2C_Read)
- {
-
- i2cPrivateHandle->base->C1 |= I2C_C1_TXAK_MASK;
-
- while (!(i2cPrivateHandle->base->S & kI2C_TransferCompleteFlag))
- {
- }
-
- i2cPrivateHandle->base->C1 |= I2C_C1_TX_MASK;
-
- *(i2cPrivateHandle->handle->transfer.data + i2cPrivateHandle->handle->transfer.dataSize - 1) =
- i2cPrivateHandle->base->D;
- }
- }
- i2cPrivateHandle->handle->state = kIdleState;
- if (i2cPrivateHandle->handle->completionCallback)
- {
- i2cPrivateHandle->handle->completionCallback(i2cPrivateHandle->base, i2cPrivateHandle->handle, result,
- i2cPrivateHandle->handle->userData);
- }
- }
- static status_t I2C_CheckAndClearError(I2C_Type *base, uint32_t status)
- {
- status_t result = kStatus_Success;
-
- if (status & kI2C_ArbitrationLostFlag)
- {
-
- base->S = kI2C_ArbitrationLostFlag;
- result = kStatus_I2C_ArbitrationLost;
- }
-
- else if (status & kI2C_ReceiveNakFlag)
- {
- result = kStatus_I2C_Nak;
- }
- else
- {
- }
- return result;
- }
- static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base,
- i2c_master_edma_handle_t *handle,
- i2c_master_transfer_t *xfer)
- {
- assert(handle);
- assert(xfer);
- status_t result = kStatus_Success;
- if (handle->state != kIdleState)
- {
- return kStatus_I2C_Busy;
- }
- else
- {
- i2c_direction_t direction = xfer->direction;
-
- handle->transfer = *xfer;
-
- handle->transferSize = xfer->dataSize;
- handle->state = kTransferDataState;
-
- I2C_MasterClearStatusFlags(base, kClearFlags);
-
- if ((xfer->subaddressSize > 0) && (xfer->direction == kI2C_Read))
- {
- direction = kI2C_Write;
- }
-
- if (handle->transfer.flags & kI2C_TransferRepeatedStartFlag)
- {
- result = I2C_MasterRepeatedStart(base, handle->transfer.slaveAddress, direction);
- }
- else
- {
- result = I2C_MasterStart(base, handle->transfer.slaveAddress, direction);
- }
- if (result)
- {
- return result;
- }
- while (!(base->S & kI2C_IntPendingFlag))
- {
- }
-
- result = I2C_CheckAndClearError(base, base->S);
-
- if (result)
- {
- if (result == kStatus_I2C_Nak)
- {
- result = kStatus_I2C_Addr_Nak;
- if (I2C_MasterStop(base) != kStatus_Success)
- {
- result = kStatus_I2C_Timeout;
- }
- if (handle->completionCallback)
- {
- (handle->completionCallback)(base, handle, result, handle->userData);
- }
- }
- return result;
- }
-
- if (handle->transfer.subaddressSize)
- {
- do
- {
-
- base->S = kI2C_IntPendingFlag;
- handle->transfer.subaddressSize--;
- base->D = ((handle->transfer.subaddress) >> (8 * handle->transfer.subaddressSize));
-
- while (!(base->S & kI2C_IntPendingFlag))
- {
- }
-
- result = I2C_CheckAndClearError(base, base->S);
- if (result)
- {
- return result;
- }
- } while ((handle->transfer.subaddressSize > 0) && (result == kStatus_Success));
- if (handle->transfer.direction == kI2C_Read)
- {
-
- base->S = kI2C_IntPendingFlag;
-
- result = I2C_MasterRepeatedStart(base, handle->transfer.slaveAddress, kI2C_Read);
- if (result)
- {
- return result;
- }
-
- while (!(base->S & kI2C_IntPendingFlag))
- {
- }
-
- result = I2C_CheckAndClearError(base, base->S);
- if (result)
- {
- return result;
- }
- }
- }
-
- base->S = kI2C_IntPendingFlag;
- }
- return result;
- }
- static void I2C_MasterTransferEDMAConfig(I2C_Type *base, i2c_master_edma_handle_t *handle)
- {
- edma_transfer_config_t transfer_config;
- if (handle->transfer.direction == kI2C_Read)
- {
- transfer_config.srcAddr = (uint32_t)I2C_GetDataRegAddr(base);
- transfer_config.destAddr = (uint32_t)(handle->transfer.data);
- transfer_config.majorLoopCounts = (handle->transfer.dataSize - 1);
- transfer_config.srcTransferSize = kEDMA_TransferSize1Bytes;
- transfer_config.srcOffset = 0;
- transfer_config.destTransferSize = kEDMA_TransferSize1Bytes;
- transfer_config.destOffset = 1;
- transfer_config.minorLoopBytes = 1;
- }
- else
- {
- transfer_config.srcAddr = (uint32_t)(handle->transfer.data + 1);
- transfer_config.destAddr = (uint32_t)I2C_GetDataRegAddr(base);
- transfer_config.majorLoopCounts = (handle->transfer.dataSize - 1);
- transfer_config.srcTransferSize = kEDMA_TransferSize1Bytes;
- transfer_config.srcOffset = 1;
- transfer_config.destTransferSize = kEDMA_TransferSize1Bytes;
- transfer_config.destOffset = 0;
- transfer_config.minorLoopBytes = 1;
- }
-
- handle->nbytes = transfer_config.minorLoopBytes;
- EDMA_SubmitTransfer(handle->dmaHandle, &transfer_config);
- EDMA_StartTransfer(handle->dmaHandle);
- }
- void I2C_MasterCreateEDMAHandle(I2C_Type *base,
- i2c_master_edma_handle_t *handle,
- i2c_master_edma_transfer_callback_t callback,
- void *userData,
- edma_handle_t *edmaHandle)
- {
- assert(handle);
- assert(edmaHandle);
- uint32_t instance = I2C_GetInstance(base);
-
- memset(handle, 0, sizeof(*handle));
-
- handle->completionCallback = callback;
- handle->userData = userData;
-
- base = base;
-
- handle->dmaHandle = edmaHandle;
- s_edmaPrivateHandle[instance].base = base;
- s_edmaPrivateHandle[instance].handle = handle;
- EDMA_SetCallback(edmaHandle, (edma_callback)I2C_MasterTransferCallbackEDMA, &s_edmaPrivateHandle[instance]);
- }
- status_t I2C_MasterTransferEDMA(I2C_Type *base, i2c_master_edma_handle_t *handle, i2c_master_transfer_t *xfer)
- {
- assert(handle);
- assert(xfer);
- status_t result;
- uint8_t tmpReg;
- volatile uint8_t dummy = 0;
-
- dummy++;
-
- I2C_EnableDMA(base, false);
-
- result = I2C_InitTransferStateMachineEDMA(base, handle, xfer);
- if (result)
- {
-
- if (result == kStatus_I2C_Nak)
- {
- if (I2C_MasterStop(base) != kStatus_Success)
- {
- result = kStatus_I2C_Timeout;
- }
- }
-
- handle->state = kIdleState;
- return result;
- }
-
-
- if (handle->transfer.dataSize > 1)
- {
- I2C_MasterTransferEDMAConfig(base, handle);
- if (handle->transfer.direction == kI2C_Read)
- {
-
- base->C1 &= ~(I2C_C1_TX_MASK | I2C_C1_TXAK_MASK);
-
- dummy = base->D;
-
- I2C_EnableDMA(base, true);
- }
- else
- {
-
- I2C_EnableDMA(base, true);
-
- base->D = *handle->transfer.data;
- }
- }
- else
- {
- if (handle->transfer.direction == kI2C_Read)
- {
- tmpReg = base->C1;
-
- tmpReg &= ~I2C_C1_TX_MASK;
-
- tmpReg |= I2C_C1_TXAK_MASK;
- base->C1 = tmpReg;
-
- dummy = base->D;
- }
- else
- {
- base->D = *handle->transfer.data;
- }
-
- while (!(base->S & kI2C_IntPendingFlag))
- {
- }
-
- base->S = kI2C_IntPendingFlag;
-
- if (!(handle->transfer.flags & kI2C_TransferNoStopFlag))
- {
- result = I2C_MasterStop(base);
- }
- else
- {
-
- base->C1 |= I2C_C1_TX_MASK;
- }
-
- if (handle->transfer.direction == kI2C_Read)
- {
- *handle->transfer.data = base->D;
- }
-
- handle->state = kIdleState;
- }
- return result;
- }
- status_t I2C_MasterTransferGetCountEDMA(I2C_Type *base, i2c_master_edma_handle_t *handle, size_t *count)
- {
- assert(handle->dmaHandle);
- if (!count)
- {
- return kStatus_InvalidArgument;
- }
- if (kIdleState != handle->state)
- {
- *count = (handle->transferSize -
- (uint32_t)handle->nbytes *
- EDMA_GetRemainingMajorLoopCount(handle->dmaHandle->base, handle->dmaHandle->channel));
- }
- else
- {
- *count = handle->transferSize;
- }
- return kStatus_Success;
- }
- void I2C_MasterTransferAbortEDMA(I2C_Type *base, i2c_master_edma_handle_t *handle)
- {
- EDMA_AbortTransfer(handle->dmaHandle);
-
- I2C_EnableDMA(base, false);
-
- handle->state = kIdleState;
- }
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