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/*
* Copyright (c) 2014, Freescale Semiconductor, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted 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 Freescale Semiconductor, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 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_crc_driver.h"
#include "fsl_clock_manager.h"
#if FSL_FEATURE_SOC_CRC_COUNT
/*FUNCTION*********************************************************************
*
* Function Name : CRC_DRV_Init
* Description : Initialize the CRC module. This API with initial configuration
* should be called before any other operations to the CRC module.
*
*END*************************************************************************/
crc_status_t CRC_DRV_Init(uint32_t instance, const crc_user_config_t *userConfigPtr)
{
if (!userConfigPtr)
{
return kStatus_CRC_InvalidArgument;
}
/* Enable clock for CRC. */
if (!CLOCK_SYS_GetCrcGateCmd(instance))
{
CLOCK_SYS_EnableCrcClock(instance);
}
return CRC_DRV_Configure(instance, userConfigPtr);
}
/*FUNCTION**********************************************************************
*
* Function Name : CRC_DRV_Deinit
* Description : Shutdown a CRC instance.
*
*END**************************************************************************/
void CRC_DRV_Deinit(uint32_t instance)
{
/* Gate the clock for CRC.*/
CLOCK_SYS_DisableCrcClock(instance);
}
/*FUNCTION**********************************************************************
*
* Function Name : CRC_DRV_GetCrcBlock
* Description : This method appends block of bytes to current CRC calculation
* and returns new result
*
*END**************************************************************************/
uint32_t CRC_DRV_GetCrcBlock(uint32_t instance, uint8_t *data, uint32_t dataLen)
{
crc_transpose_t oldInputTranspose;
uint32_t *data32;
uint8_t *data8;
uint32_t result;
assert(data != NULL);
assert(dataLen != 0);
/* flip bytes because of little endian architecture */
oldInputTranspose = CRC_HAL_GetWriteTranspose(g_crcBase[instance]);
switch (oldInputTranspose) {
case kCrcNoTranspose:
CRC_HAL_SetWriteTranspose(g_crcBase[instance], kCrcTransposeBytes);
break;
case kCrcTransposeBits:
CRC_HAL_SetWriteTranspose(g_crcBase[instance], kCrcTransposeBoth);
break;
case kCrcTransposeBoth:
CRC_HAL_SetWriteTranspose(g_crcBase[instance], kCrcTransposeBits);
break;
case kCrcTransposeBytes:
CRC_HAL_SetWriteTranspose(g_crcBase[instance], kCrcNoTranspose);
break;
default:
break;
}
/* Start the checksum calculation */
/* If address is not word-aligned, then read initial bytes in 8bit mode till word-aligned */
while (((uint32_t)data & 3U) && (dataLen > 0))
{
CRC_HAL_SetDataLLReg(g_crcBase[instance], *(data++));
dataLen--;
}
data32 = (uint32_t *)data;
while (dataLen >= sizeof(uint32_t))
{
CRC_HAL_SetDataReg(g_crcBase[instance], *(data32++)); /* 32bit access */
dataLen -= sizeof(uint32_t);
}
data8 = (uint8_t *)data32;
switch(dataLen)
{
case 3U:
CRC_HAL_SetDataLReg(g_crcBase[instance], *(uint16_t *)data8); /* 16 bit */
CRC_HAL_SetDataLLReg(g_crcBase[instance], *(data8 + 2U)); /* 8 bit */
break;
case 2U:
CRC_HAL_SetDataLReg(g_crcBase[instance], *(uint16_t *)data8); /* 16 bit */
break;
case 1U:
CRC_HAL_SetDataLLReg(g_crcBase[instance], *data8); /* 8 bit */
break;
default:
break;
}
result = CRC_HAL_GetCrcResult(g_crcBase[instance]);
CRC_HAL_SetWriteTranspose(g_crcBase[instance], oldInputTranspose);
return result;
}
/*FUNCTION**********************************************************************
*
* Function Name : CRC_DRV_Configure
* Description : Configure CRC module from a user configuration.
*
*END**************************************************************************/
crc_status_t CRC_DRV_Configure(uint32_t instance, const crc_user_config_t *userConfigPtr)
{
if((!userConfigPtr))
{
return kStatus_CRC_InvalidArgument;
}
/* 1. set 16 or 32-bit crc width */
CRC_HAL_SetProtocolWidth(g_crcBase[instance], userConfigPtr->crcWidth);
/* 2. set transpose and complement options */
CRC_HAL_SetWriteTranspose(g_crcBase[instance], userConfigPtr->writeTranspose);
CRC_HAL_SetReadTranspose(g_crcBase[instance], userConfigPtr->readTranspose);
CRC_HAL_SetXorMode(g_crcBase[instance], userConfigPtr->complementRead);
/* 3. Write polynomial */
CRC_HAL_SetPolyReg(g_crcBase[instance], userConfigPtr->polynomial);
/* 4. Set seed value */
CRC_HAL_SetSeedOrDataMode(g_crcBase[instance], true);
CRC_HAL_SetDataReg(g_crcBase[instance], userConfigPtr->seed);
CRC_HAL_SetSeedOrDataMode(g_crcBase[instance], false);
return kStatus_CRC_Success;
}
#endif
/******************************************************************************
* EOF
*****************************************************************************/
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