kopia lustrzana https://github.com/micropython/micropython
306 wiersze
10 KiB
C
306 wiersze
10 KiB
C
//*****************************************************************************
|
|
//
|
|
// crc.c
|
|
//
|
|
// Driver for the CRC module.
|
|
//
|
|
// Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
|
|
//
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions
|
|
// are met:
|
|
//
|
|
// Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
//
|
|
// 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.
|
|
//
|
|
// Neither the name of Texas Instruments Incorporated 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
|
|
// OWNER 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.
|
|
//
|
|
//*****************************************************************************
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! \addtogroup CRC_Cyclic_Redundancy_Check_api
|
|
//! @{
|
|
//
|
|
//*****************************************************************************
|
|
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "inc/hw_dthe.h"
|
|
#include "inc/hw_memmap.h"
|
|
#include "inc/hw_types.h"
|
|
#include "crc.h"
|
|
#include "debug.h"
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Set the configuration of CRC functionality with the EC module.
|
|
//!
|
|
//! \param ui32Base is the base address of the EC module.
|
|
//! \param ui32CRCConfig is the configuration of the CRC engine.
|
|
//!
|
|
//! This function configures the operation of the CRC engine within the EC
|
|
//! module. The configuration is specified with the \e ui32CRCConfig argument.
|
|
//! It is the logical OR of any of the following options:
|
|
//!
|
|
//! CRC Initialization Value
|
|
//! - \b EC_CRC_CFG_INIT_SEED - Initialize with seed value
|
|
//! - \b EC_CRC_CFG_INIT_0 - Initialize to all '0s'
|
|
//! - \b EC_CRC_CFG_INIT_1 - Initialize to all '1s'
|
|
//!
|
|
//! Input Data Size
|
|
//! - \b EC_CRC_CFG_SIZE_8BIT - Input data size of 8 bits
|
|
//! - \b EC_CRC_CFG_SIZE_32BIT - Input data size of 32 bits
|
|
//!
|
|
//! Post Process Reverse/Inverse
|
|
//! - \b EC_CRC_CFG_RESINV - Result inverse enable
|
|
//! - \b EC_CRC_CFG_OBR - Output reverse enable
|
|
//!
|
|
//! Input Bit Reverse
|
|
//! - \b EC_CRC_CFG_IBR - Bit reverse enable
|
|
//!
|
|
//! Endian Control
|
|
//! - \b EC_CRC_CFG_ENDIAN_SBHW - Swap byte in half-word
|
|
//! - \b EC_CRC_CFG_ENDIAN_SHW - Swap half-word
|
|
//!
|
|
//! Operation Type
|
|
//! - \b EC_CRC_CFG_TYPE_P8005 - Polynomial 0x8005
|
|
//! - \b EC_CRC_CFG_TYPE_P1021 - Polynomial 0x1021
|
|
//! - \b EC_CRC_CFG_TYPE_P4C11DB7 - Polynomial 0x4C11DB7
|
|
//! - \b EC_CRC_CFG_TYPE_P1EDC6F41 - Polynomial 0x1EDC6F41
|
|
//! - \b EC_CRC_CFG_TYPE_TCPCHKSUM - TCP checksum
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
CRCConfigSet(uint32_t ui32Base, uint32_t ui32CRCConfig)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DTHE_BASE);
|
|
ASSERT((ui32CRCConfig & CRC_CFG_INIT_SEED) ||
|
|
(ui32CRCConfig & CRC_CFG_INIT_0) ||
|
|
(ui32CRCConfig & CRC_CFG_INIT_1) ||
|
|
(ui32CRCConfig & CRC_CFG_SIZE_8BIT) ||
|
|
(ui32CRCConfig & CRC_CFG_SIZE_32BIT) ||
|
|
(ui32CRCConfig & CRC_CFG_RESINV) ||
|
|
(ui32CRCConfig & CRC_CFG_OBR) ||
|
|
(ui32CRCConfig & CRC_CFG_IBR) ||
|
|
(ui32CRCConfig & CRC_CFG_ENDIAN_SBHW) ||
|
|
(ui32CRCConfig & CRC_CFG_ENDIAN_SHW) ||
|
|
(ui32CRCConfig & CRC_CFG_TYPE_P8005) ||
|
|
(ui32CRCConfig & CRC_CFG_TYPE_P1021) ||
|
|
(ui32CRCConfig & CRC_CFG_TYPE_P4C11DB7) ||
|
|
(ui32CRCConfig & CRC_CFG_TYPE_P1EDC6F41) ||
|
|
(ui32CRCConfig & CRC_CFG_TYPE_TCPCHKSUM));
|
|
|
|
//
|
|
// Write the control register with the configuration.
|
|
//
|
|
HWREG(ui32Base + DTHE_O_CRC_CTRL) = ui32CRCConfig;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Write the seed value for CRC operations in the EC module.
|
|
//!
|
|
//! \param ui32Base is the base address of the EC module.
|
|
//! \param ui32Seed is the seed value.
|
|
//!
|
|
//! This function writes the seed value for use with CRC operations in the
|
|
//! EC module. This value is the start value for CRC operations. If this
|
|
//! value is not written, then the residual seed from the previous operation
|
|
//! is used as the starting value.
|
|
//!
|
|
//! \note The seed must be written only if \b EC_CRC_CFG_INIT_SEED is
|
|
//! set with the CRCConfigSet() function.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
CRCSeedSet(uint32_t ui32Base, uint32_t ui32Seed)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DTHE_BASE);
|
|
|
|
//
|
|
// Write the seed value to the seed register.
|
|
//
|
|
HWREG(ui32Base + DTHE_O_CRC_SEED) = ui32Seed;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Write data into the EC module for CRC operations.
|
|
//!
|
|
//! \param ui32Base is the base address of the EC module.
|
|
//! \param ui32Data is the data to be written.
|
|
//!
|
|
//! This function writes either 8 or 32 bits of data into the EC module for
|
|
//! CRC operations. The distinction between 8 and 32 bits of data is made
|
|
//! when the \b EC_CRC_CFG_SIZE_8BIT or \b EC_CRC_CFG_SIZE_32BIT flag
|
|
//! is set using the CRCConfigSet() function.
|
|
//!
|
|
//! When writing 8 bits of data, ensure the data is in the least signficant
|
|
//! byte position. The remaining bytes should be written with zero. For
|
|
//! example, when writing 0xAB, \e ui32Data should be 0x000000AB.
|
|
//!
|
|
//! \return None
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
CRCDataWrite(uint32_t ui32Base, uint32_t ui32Data)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DTHE_BASE);
|
|
|
|
//
|
|
// Write the data
|
|
//
|
|
HWREG(DTHE_BASE + DTHE_O_CRC_DIN) = ui32Data;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Reads the result of a CRC operation in the EC module.
|
|
//!
|
|
//! \param ui32Base is the base address of the EC module.
|
|
//!
|
|
//! This function reads either the unmodified CRC result or the post
|
|
//! processed CRC result from the EC module. The post-processing options
|
|
//! are selectable through \b EC_CRC_CFG_RESINV and \b EC_CRC_CFG_OBR
|
|
//! parameters in the CRCConfigSet() function.
|
|
//!
|
|
//! \return The CRC result.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
CRCResultRead(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DTHE_BASE);
|
|
|
|
//
|
|
// return value.
|
|
//
|
|
return(HWREG(DTHE_BASE + DTHE_O_CRC_RSLT_PP));
|
|
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Process data to generate a CRC with the EC module.
|
|
//!
|
|
//! \param ui32Base is the base address of the EC module.
|
|
//! \param puiDataIn is a pointer to an array of data that is processed.
|
|
//! \param ui32DataLength is the number of data items that are processed
|
|
//! to produce the CRC.
|
|
//! \param ui32Config the config parameter to determine the CRC mode
|
|
//!
|
|
//! This function processes an array of data to produce a CRC result.
|
|
//! This function takes the CRC mode as the parameter.
|
|
//!
|
|
//! The data in the array pointed to be \e pui32DataIn is either an array
|
|
//! of bytes or an array or words depending on the selection of the input
|
|
//! data size options \b EC_CRC_CFG_SIZE_8BIT and
|
|
//! \b EC_CRC_CFG_SIZE_32BIT.
|
|
//!
|
|
//! This function returns either the unmodified CRC result or the
|
|
//! post- processed CRC result from the EC module. The post-processing
|
|
//! options are selectable through \b EC_CRC_CFG_RESINV and
|
|
//! \b EC_CRC_CFG_OBR parameters.
|
|
//!
|
|
//! \return The CRC result.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
CRCDataProcess(uint32_t ui32Base, void *puiDataIn,
|
|
uint32_t ui32DataLength, uint32_t ui32Config)
|
|
{
|
|
uint8_t *pui8DataIn;
|
|
uint32_t *pui32DataIn;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DTHE_BASE);
|
|
|
|
//
|
|
// See if the CRC is operating in 8-bit or 32-bit mode.
|
|
//
|
|
if(ui32Config & DTHE_CRC_CTRL_SIZE)
|
|
{
|
|
//
|
|
// The CRC is operating in 8-bit mode, so create an 8-bit pointer to
|
|
// the data.
|
|
//
|
|
pui8DataIn = (uint8_t *)puiDataIn;
|
|
|
|
//
|
|
// Loop through the input data.
|
|
//
|
|
while(ui32DataLength--)
|
|
{
|
|
//
|
|
// Write the next data byte.
|
|
//
|
|
HWREG(ui32Base + DTHE_O_CRC_DIN) = *pui8DataIn++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// The CRC is operating in 32-bit mode, so loop through the input data.
|
|
//
|
|
pui32DataIn = (uint32_t *)puiDataIn;
|
|
while(ui32DataLength--)
|
|
{
|
|
//
|
|
// Write the next data word.
|
|
//
|
|
HWREG(ui32Base + DTHE_O_CRC_DIN) = *pui32DataIn++;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Return the result.
|
|
//
|
|
return(CRCResultRead(ui32Base));
|
|
}
|
|
|
|
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Close the Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|