diff options
Diffstat (limited to 'drivers/fsl_i2c_edma.c')
| -rw-r--r-- | drivers/fsl_i2c_edma.c | 138 |
1 files changed, 90 insertions, 48 deletions
diff --git a/drivers/fsl_i2c_edma.c b/drivers/fsl_i2c_edma.c index c8f7c20..28a415e 100644 --- a/drivers/fsl_i2c_edma.c +++ b/drivers/fsl_i2c_edma.c @@ -1,6 +1,6 @@ /* * Copyright (c) 2015, Freescale Semiconductor, Inc. - * All rights reserved. + * Copyright 2016-2017 NXP * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: @@ -12,7 +12,7 @@ * list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * - * o Neither the name of Freescale Semiconductor, Inc. nor the names of its + * 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. * @@ -162,6 +162,26 @@ static void I2C_MasterTransferCallbackEDMA(edma_handle_t *handle, void *userData result = I2C_MasterStop(i2cPrivateHandle->base); } } + else + { + if (i2cPrivateHandle->handle->transfer.direction == kI2C_Read) + { + /* Change to send NAK at the last byte. */ + i2cPrivateHandle->base->C1 |= I2C_C1_TXAK_MASK; + + /* Wait the last data to be received. */ + while (!(i2cPrivateHandle->base->S & kI2C_TransferCompleteFlag)) + { + } + + /* Change direction to send. */ + i2cPrivateHandle->base->C1 |= I2C_C1_TX_MASK; + + /* Read the last data byte. */ + *(i2cPrivateHandle->handle->transfer.data + i2cPrivateHandle->handle->transfer.dataSize - 1) = + i2cPrivateHandle->base->D; + } + } i2cPrivateHandle->handle->state = kIdleState; @@ -203,7 +223,6 @@ static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base, assert(xfer); status_t result = kStatus_Success; - uint16_t timeout = UINT16_MAX; if (handle->state != kIdleState) { @@ -221,16 +240,6 @@ static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base, handle->state = kTransferDataState; - /* Wait until ready to complete. */ - while ((!(base->S & kI2C_TransferCompleteFlag)) && (--timeout)) - { - } - - /* Failed to start the transfer. */ - if (timeout == 0) - { - return kStatus_I2C_Timeout; - } /* Clear all status before transfer. */ I2C_MasterClearStatusFlags(base, kClearFlags); @@ -250,22 +259,55 @@ static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base, result = I2C_MasterStart(base, handle->transfer.slaveAddress, direction); } - /* Send subaddress. */ - if (handle->transfer.subaddressSize) + if (result) { - do + return result; + } + + while (!(base->S & kI2C_IntPendingFlag)) + { + } + + /* Check if there's transfer error. */ + result = I2C_CheckAndClearError(base, base->S); + + /* Return if error. */ + if (result) + { + if (result == kStatus_I2C_Nak) { - /* Wait until data transfer complete. */ - while (!(base->S & kI2C_IntPendingFlag)) + 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; + } + + /* Send subaddress. */ + if (handle->transfer.subaddressSize) + { + do + { /* Clear interrupt pending flag. */ base->S = kI2C_IntPendingFlag; handle->transfer.subaddressSize--; base->D = ((handle->transfer.subaddress) >> (8 * handle->transfer.subaddressSize)); + /* Wait until data transfer complete. */ + while (!(base->S & kI2C_IntPendingFlag)) + { + } + /* Check if there's transfer error. */ result = I2C_CheckAndClearError(base, base->S); @@ -278,34 +320,34 @@ static status_t I2C_InitTransferStateMachineEDMA(I2C_Type *base, if (handle->transfer.direction == kI2C_Read) { - /* Wait until data transfer complete. */ - while (!(base->S & kI2C_IntPendingFlag)) - { - } - /* Clear pending flag. */ base->S = kI2C_IntPendingFlag; /* Send repeated start and slave address. */ result = I2C_MasterRepeatedStart(base, handle->transfer.slaveAddress, kI2C_Read); - } - } - if (result) - { - return result; - } + if (result) + { + return result; + } - /* Wait until data transfer complete. */ - while (!(base->S & kI2C_IntPendingFlag)) - { + /* Wait until data transfer complete. */ + while (!(base->S & kI2C_IntPendingFlag)) + { + } + + /* Check if there's transfer error. */ + result = I2C_CheckAndClearError(base, base->S); + + if (result) + { + return result; + } + } } /* Clear pending flag. */ base->S = kI2C_IntPendingFlag; - - /* Check if there's transfer error. */ - result = I2C_CheckAndClearError(base, base->S); } return result; @@ -319,17 +361,7 @@ static void I2C_MasterTransferEDMAConfig(I2C_Type *base, i2c_master_edma_handle_ { transfer_config.srcAddr = (uint32_t)I2C_GetDataRegAddr(base); transfer_config.destAddr = (uint32_t)(handle->transfer.data); - - /* Send stop if kI2C_TransferNoStop flag is not asserted. */ - if (!(handle->transfer.flags & kI2C_TransferNoStopFlag)) - { - transfer_config.majorLoopCounts = (handle->transfer.dataSize - 1); - } - else - { - transfer_config.majorLoopCounts = handle->transfer.dataSize; - } - + transfer_config.majorLoopCounts = (handle->transfer.dataSize - 1); transfer_config.srcTransferSize = kEDMA_TransferSize1Bytes; transfer_config.srcOffset = 0; transfer_config.destTransferSize = kEDMA_TransferSize1Bytes; @@ -348,6 +380,9 @@ static void I2C_MasterTransferEDMAConfig(I2C_Type *base, i2c_master_edma_handle_ transfer_config.minorLoopBytes = 1; } + /* Store the initially configured eDMA minor byte transfer count into the I2C handle */ + handle->nbytes = transfer_config.minorLoopBytes; + EDMA_SubmitTransfer(handle->dmaHandle, &transfer_config); EDMA_StartTransfer(handle->dmaHandle); } @@ -427,7 +462,7 @@ status_t I2C_MasterTransferEDMA(I2C_Type *base, i2c_master_edma_handle_t *handle if (handle->transfer.direction == kI2C_Read) { /* Change direction for receive. */ - base->C1 &= ~I2C_C1_TX_MASK; + base->C1 &= ~(I2C_C1_TX_MASK | I2C_C1_TXAK_MASK); /* Read dummy to release the bus. */ dummy = base->D; @@ -479,6 +514,11 @@ status_t I2C_MasterTransferEDMA(I2C_Type *base, i2c_master_edma_handle_t *handle { result = I2C_MasterStop(base); } + else + { + /* Change direction to send. */ + base->C1 |= I2C_C1_TX_MASK; + } /* Read the last byte of data. */ if (handle->transfer.direction == kI2C_Read) @@ -504,7 +544,9 @@ status_t I2C_MasterTransferGetCountEDMA(I2C_Type *base, i2c_master_edma_handle_t if (kIdleState != handle->state) { - *count = (handle->transferSize - EDMA_GetRemainingBytes(handle->dmaHandle->base, handle->dmaHandle->channel)); + *count = (handle->transferSize - + (uint32_t)handle->nbytes * + EDMA_GetRemainingMajorLoopCount(handle->dmaHandle->base, handle->dmaHandle->channel)); } else { |