808 lines
24 KiB
C
808 lines
24 KiB
C
//*****************************************************************************
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//
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// des.c - Driver for the DES data transformation.
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//
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// Copyright (c) 2012-2014 Texas Instruments Incorporated. All rights reserved.
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// Software License Agreement
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 2.1.0.12573 of the Tiva Peripheral Driver Library.
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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//! \addtogroup des_api
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//! @{
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//
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//*****************************************************************************
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#include <stdbool.h>
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#include <stdint.h>
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#include "inc/hw_des.h"
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#include "inc/hw_ints.h"
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#include "inc/hw_memmap.h"
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#include "inc/hw_types.h"
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#include "driverlib/debug.h"
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#include "driverlib/des.h"
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#include "driverlib/interrupt.h"
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//*****************************************************************************
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//
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//! Resets the DES Module.
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//!
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//! \param ui32Base is the base address of the DES module.
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//!
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//! This function performs a soft-reset sequence of the DES module.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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DESReset(uint32_t ui32Base)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Trigger the soft reset.
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//
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HWREG(ui32Base + DES_O_SYSCONFIG) |= DES_SYSCONFIG_SOFTRESET;
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//
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// Wait for the reset to finish.
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//
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while((HWREG(ui32Base + DES_O_SYSSTATUS) &
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DES_SYSSTATUS_RESETDONE) == 0)
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{
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}
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}
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//*****************************************************************************
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//
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//! Configures the DES module for operation.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param ui32Config is the configuration of the DES module.
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//!
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//! This function configures the DES module for operation.
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//!
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//! The \e ui32Config parameter is a bit-wise OR of a number of configuration
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//! flags. The valid flags are grouped below based on their function.
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//!
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//! The direction of the operation is specified with one of the following two
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//! flags. Only one is permitted.
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//!
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//! - \b DES_CFG_DIR_ENCRYPT - Encryption
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//! - \b DES_CFG_DIR_DECRYPT - Decryption
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//!
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//! The operational mode of the DES engine is specified with one of the
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//! following flags. Only one is permitted.
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//!
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//! - \b DES_CFG_MODE_ECB - Electronic Codebook Mode
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//! - \b DES_CFG_MODE_CBC - Cipher-Block Chaining Mode
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//! - \b DES_CFG_MODE_CFB - Cipher Feedback Mode
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//!
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//! The selection of single DES or triple DES is specified with one of the
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//! following two flags. Only one is permitted.
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//!
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//! - \b DES_CFG_SINGLE - Single DES
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//! - \b DES_CFG_TRIPLE - Triple DES
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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DESConfigSet(uint32_t ui32Base, uint32_t ui32Config)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Backup the save context field.
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//
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ui32Config |= (HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_CONTEXT);
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//
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// Write the control register.
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//
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HWREG(ui32Base + DES_O_CTRL) = ui32Config;
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}
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//*****************************************************************************
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//
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//! Sets the key used for DES operations.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32Key is a pointer to an array that holds the key
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//!
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//! This function sets the key used for DES operations.
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//!
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//! \e pui32Key should be 64 bits long (2 words) if single DES is being used or
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//! 192 bits (6 words) if triple DES is being used.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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DESKeySet(uint32_t ui32Base, uint32_t *pui32Key)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Write the first part of the key.
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//
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HWREG(ui32Base + DES_O_KEY1_L) = pui32Key[0];
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HWREG(ui32Base + DES_O_KEY1_H) = pui32Key[1];
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//
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// If we are performing tripe DES, then write the key registers for
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// the second and third rounds.
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//
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if(HWREG(ui32Base + DES_O_CTRL) & DES_CFG_TRIPLE)
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{
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HWREG(ui32Base + DES_O_KEY2_L) = pui32Key[2];
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HWREG(ui32Base + DES_O_KEY2_H) = pui32Key[3];
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HWREG(ui32Base + DES_O_KEY3_L) = pui32Key[4];
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HWREG(ui32Base + DES_O_KEY3_H) = pui32Key[5];
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}
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}
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//*****************************************************************************
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//
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//! Sets the initialization vector in the DES module.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32IVdata is a pointer to an array of 64 bits (2 words) of data to
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//! be written into the initialization vectors registers.
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//!
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//! This function sets the initialization vector in the DES module. It returns
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//! true if the registers were successfully written. If the context registers
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//! cannot be written at the time the function was called, then false is
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//! returned.
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//!
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//! \return True or false.
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//
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//*****************************************************************************
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bool
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DESIVSet(uint32_t ui32Base, uint32_t *pui32IVdata)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Check to see if context registers can be overwritten. If not, return
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// false.
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//
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if((HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_CONTEXT) == 0)
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{
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return(false);
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}
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//
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// Write the initialization vector registers.
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//
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HWREG(ui32Base + DES_O_IV_L) = pui32IVdata[0];
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HWREG(ui32Base + DES_O_IV_H) = pui32IVdata[1];
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//
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// Return true to indicate the write was successful.
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//
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return(true);
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}
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//*****************************************************************************
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//
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//! Sets the crytographic data length in the DES module.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param ui32Length is the length of the data in bytes.
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//!
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//! This function writes the cryptographic data length into the DES module.
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//! When this register is written, the engine is triggered to start using this
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//! context.
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//!
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//! \note Data lengths up to (2^32 - 1) bytes are allowed.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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DESLengthSet(uint32_t ui32Base, uint32_t ui32Length)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Write the length register.
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//
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HWREG(ui32Base + DES_O_LENGTH) = ui32Length;
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}
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//*****************************************************************************
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//
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//! Reads plaintext/ciphertext from data registers without blocking
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32Dest is a pointer to an array of 2 words.
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//!
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//! This function returns true if the data was ready when the function was
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//! called. If the data was not ready, false is returned.
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//!
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//! \return True or false.
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//
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//*****************************************************************************
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bool
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DESDataReadNonBlocking(uint32_t ui32Base, uint32_t *pui32Dest)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Check to see if the data is ready to be read.
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//
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if((DES_CTRL_OUTPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
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{
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return(false);
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}
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//
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// Read two words of data from the data registers.
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//
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pui32Dest[0] = HWREG(DES_BASE + DES_O_DATA_L);
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pui32Dest[1] = HWREG(DES_BASE + DES_O_DATA_H);
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//
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// Return true to indicate a successful write.
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//
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return(true);
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}
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//*****************************************************************************
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//
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//! Reads plaintext/ciphertext from data registers with blocking.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32Dest is a pointer to an array of bytes.
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//!
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//! This function waits until the DES module is finished and encrypted or
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//! decrypted data is ready. The output data is then stored in the pui32Dest
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//! array.
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//!
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//! \return None
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//
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//*****************************************************************************
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void
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DESDataRead(uint32_t ui32Base, uint32_t *pui32Dest)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Wait for data output to be ready.
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//
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while((HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_OUTPUT_READY) == 0)
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{
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}
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//
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// Read two words of data from the data registers.
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//
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pui32Dest[0] = HWREG(DES_BASE + DES_O_DATA_L);
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pui32Dest[1] = HWREG(DES_BASE + DES_O_DATA_H);
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}
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//*****************************************************************************
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//
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//! Writes plaintext/ciphertext to data registers without blocking
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32Src is a pointer to an array of 2 words.
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//!
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//! This function returns false if the DES module is not ready to accept
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//! data. It returns true if the data was written successfully.
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//!
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//! \return true or false.
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//
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//*****************************************************************************
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bool
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DESDataWriteNonBlocking(uint32_t ui32Base, uint32_t *pui32Src)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Check if the DES module is ready to encrypt or decrypt data. If it
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// is not, return false.
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//
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if(!(DES_CTRL_INPUT_READY & (HWREG(ui32Base + DES_O_CTRL))))
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{
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return(false);
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}
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//
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// Write the data.
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//
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HWREG(DES_BASE + DES_O_DATA_L) = pui32Src[0];
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HWREG(DES_BASE + DES_O_DATA_H) = pui32Src[1];
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//
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// Return true to indicate a successful write.
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//
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return(true);
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}
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//*****************************************************************************
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//
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//! Writes plaintext/ciphertext to data registers without blocking
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32Src is a pointer to an array of bytes.
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//!
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//! This function waits until the DES module is ready before writing the
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//! data contained in the pui32Src array.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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DESDataWrite(uint32_t ui32Base, uint32_t *pui32Src)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Wait for the input ready bit to go high.
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//
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while(((HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_INPUT_READY)) == 0)
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{
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}
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//
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// Write the data.
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//
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HWREG(DES_BASE + DES_O_DATA_L) = pui32Src[0];
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HWREG(DES_BASE + DES_O_DATA_H) = pui32Src[1];
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}
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//*****************************************************************************
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//
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//! Processes blocks of data through the DES module.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param pui32Src is a pointer to an array of words that contains the
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//! source data for processing.
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//! \param pui32Dest is a pointer to an array of words consisting of the
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//! processed data.
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//! \param ui32Length is the length of the cryptographic data in bytes.
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//! It must be a multiple of eight.
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//!
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//! This function takes the data contained in the pui32Src array and processes
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//! it using the DES engine. The resulting data is stored in the
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//! pui32Dest array. The function blocks until all of the data has been
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//! processed. If processing is successful, the function returns true.
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//!
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//! \note This functions assumes that the DES module has been configured,
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//! and initialization values and keys have been written.
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//!
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//! \return true or false.
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//
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//*****************************************************************************
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bool
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DESDataProcess(uint32_t ui32Base, uint32_t *pui32Src, uint32_t *pui32Dest,
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uint32_t ui32Length)
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{
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uint32_t ui32Count;
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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ASSERT((ui32Length % 8) == 0);
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//
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// Write the length register first. This triggers the engine to start
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// using this context.
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//
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HWREG(ui32Base + DES_O_LENGTH) = ui32Length;
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//
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// Now loop until the blocks are written.
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//
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for(ui32Count = 0; ui32Count < (ui32Length / 4); ui32Count += 2)
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{
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//
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// Check if the input ready is fine
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//
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while((DES_CTRL_INPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
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{
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}
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//
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// Write the block data.
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//
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DESDataWriteNonBlocking(ui32Base, pui32Src + ui32Count);
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//
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// Wait for the output ready
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//
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while((DES_CTRL_OUTPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
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{
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}
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//
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// Read the processed data block.
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//
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DESDataReadNonBlocking(ui32Base, pui32Dest + ui32Count);
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}
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//
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// Return true to indicate the process was successful.
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//
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return(true);
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}
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//*****************************************************************************
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//
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//! Returns the current interrupt status of the DES module.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param bMasked is \b false if the raw interrupt status is required and
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//! \b true if the masked interrupt status is required.
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//!
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//! This function gets the current interrupt status of the DES module.
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//! The value returned is a logical OR of the following values:
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//!
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//! - \b DES_INT_CONTEXT_IN - Context interrupt
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//! - \b DES_INT_DATA_IN - Data input interrupt
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//! - \b DES_INT_DATA_OUT_INT - Data output interrupt
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//! - \b DES_INT_DMA_CONTEXT_IN - Context DMA done interrupt
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//! - \b DES_INT_DMA_DATA_IN - Data input DMA done interrupt
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//! - \b DES_INT_DMA_DATA_OUT - Data output DMA done interrupt
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//!
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//! \return A bit mask of the current interrupt status.
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//
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//*****************************************************************************
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uint32_t
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DESIntStatus(uint32_t ui32Base, bool bMasked)
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{
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uint32_t ui32Status, ui32Enable;
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//
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// Check the arguments.
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//
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ASSERT(ui32Base == DES_BASE);
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//
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// Read the status register and return the value.
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//
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ui32Status = HWREG(ui32Base + DES_O_IRQSTATUS);
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if(bMasked)
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{
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ui32Enable = HWREG(ui32Base + DES_O_IRQENABLE);
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return((ui32Status & ui32Enable) |
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(HWREG(ui32Base + DES_O_DMAMIS) << 16));
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}
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else
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{
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return(ui32Status | (HWREG(ui32Base + DES_O_DMARIS) << 16));
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}
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}
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//*****************************************************************************
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//
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//! Enables interrupts in the DES module.
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//!
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//! \param ui32Base is the base address of the DES module.
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//! \param ui32IntFlags is a bit mask of the interrupts to be enabled.
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//!
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//! \e ui32IntFlags should be a logical OR of one or more of the following
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//! values:
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//!
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//! - \b DES_INT_CONTEXT_IN - Context interrupt
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//! - \b DES_INT_DATA_IN - Data input interrupt
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//! - \b DES_INT_DATA_OUT - Data output interrupt
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//! - \b DES_INT_DMA_CONTEXT_IN - Context DMA done interrupt
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//! - \b DES_INT_DMA_DATA_IN - Data input DMA done interrupt
|
|
//! - \b DES_INT_DMA_DATA_OUT - Data output DMA done interrupt
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESIntEnable(uint32_t ui32Base, uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
ASSERT((ui32IntFlags & DES_INT_CONTEXT_IN) ||
|
|
(ui32IntFlags & DES_INT_DATA_IN) ||
|
|
(ui32IntFlags & DES_INT_DATA_OUT) ||
|
|
(ui32IntFlags & DES_INT_DMA_CONTEXT_IN) ||
|
|
(ui32IntFlags & DES_INT_DMA_DATA_IN) ||
|
|
(ui32IntFlags & DES_INT_DMA_DATA_OUT));
|
|
|
|
//
|
|
// Enable the interrupts from the flags.
|
|
//
|
|
HWREG(ui32Base + DES_O_DMAIM) |= (ui32IntFlags & 0x00070000) >> 16;
|
|
HWREG(ui32Base + DES_O_IRQENABLE) |= ui32IntFlags & 0x0000ffff;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables interrupts in the DES module.
|
|
//!
|
|
//! \param ui32Base is the base address of the DES module.
|
|
//! \param ui32IntFlags is a bit mask of the interrupts to be disabled.
|
|
//!
|
|
//! This function disables interrupt sources in the DES module.
|
|
//! \e ui32IntFlags should be a logical OR of one or more of the following
|
|
//! values:
|
|
//!
|
|
//! - \b DES_INT_CONTEXT_IN - Context interrupt
|
|
//! - \b DES_INT_DATA_IN - Data input interrupt
|
|
//! - \b DES_INT_DATA_OUT - Data output interrupt
|
|
//! - \b DES_INT_DMA_CONTEXT_IN - Context DMA done interrupt
|
|
//! - \b DES_INT_DMA_DATA_IN - Data input DMA done interrupt
|
|
//! - \b DES_INT_DMA_DATA_OUT - Data output DMA done interrupt
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESIntDisable(uint32_t ui32Base, uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
ASSERT((ui32IntFlags & DES_INT_CONTEXT_IN) ||
|
|
(ui32IntFlags & DES_INT_DATA_IN) ||
|
|
(ui32IntFlags & DES_INT_DATA_OUT) ||
|
|
(ui32IntFlags & DES_INT_DMA_CONTEXT_IN) ||
|
|
(ui32IntFlags & DES_INT_DMA_DATA_IN) ||
|
|
(ui32IntFlags & DES_INT_DMA_DATA_OUT));
|
|
|
|
//
|
|
// Clear the interrupts from the flags.
|
|
//
|
|
HWREG(ui32Base + DES_O_DMAIM) &= ~((ui32IntFlags & 0x00070000) >> 16);
|
|
HWREG(ui32Base + DES_O_IRQENABLE) &= ~(ui32IntFlags & 0x0000ffff);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears interrupts in the DES module.
|
|
//!
|
|
//! \param ui32Base is the base address of the DES module.
|
|
//! \param ui32IntFlags is a bit mask of the interrupts to be disabled.
|
|
//!
|
|
//! This function disables interrupt sources in the DES module.
|
|
//! \e ui32IntFlags should be a logical OR of one or more of the following
|
|
//! values:
|
|
//!
|
|
//! - \b DES_INT_DMA_CONTEXT_IN - Context interrupt
|
|
//! - \b DES_INT_DMA_DATA_IN - Data input interrupt
|
|
//! - \b DES_INT_DMA_DATA_OUT - Data output interrupt
|
|
//!
|
|
//! \note The DMA done interrupts are the only interrupts that can be cleared.
|
|
//! The remaining interrupts can be disabled instead using DESIntDisable().
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESIntClear(uint32_t ui32Base, uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
ASSERT((ui32IntFlags & DES_INT_DMA_CONTEXT_IN) ||
|
|
(ui32IntFlags & DES_INT_DMA_DATA_IN) ||
|
|
(ui32IntFlags & DES_INT_DMA_DATA_OUT));
|
|
|
|
HWREG(ui32Base + DES_O_DMAIC) = (ui32IntFlags & 0x00070000) >> 16;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Registers an interrupt handler for the DES module.
|
|
//!
|
|
//! \param ui32Base is the base address of the DES module.
|
|
//! \param pfnHandler is a pointer to the function to be called when the
|
|
//! enabled DES interrupts occur.
|
|
//!
|
|
//! This function registers the interrupt handler in the interrupt vector
|
|
//! table, and enables DES interrupts on the interrupt controller; specific DES
|
|
//! interrupt sources must be enabled using DESIntEnable(). The interrupt
|
|
//! handler being registered must clear the source of the interrupt using
|
|
//! DESIntClear().
|
|
//!
|
|
//! If the application is using a static interrupt vector table stored in
|
|
//! flash, then it is not necessary to register the interrupt handler this way.
|
|
//! Instead, IntEnable() should be used to enable DES interrupts on the
|
|
//! interrupt controller.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESIntRegister(uint32_t ui32Base, void (*pfnHandler)(void))
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
|
|
//
|
|
// Register the interrupt handler.
|
|
//
|
|
IntRegister(INT_DES0_TM4C129, pfnHandler);
|
|
|
|
//
|
|
// Enable the interrupt.
|
|
//
|
|
IntEnable(INT_DES0_TM4C129);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Unregisters an interrupt handler for the DES module.
|
|
//!
|
|
//! \param ui32Base is the base address of the DES module.
|
|
//!
|
|
//! This function unregisters the previously registered interrupt handler and
|
|
//! disables the interrupt in the interrupt controller.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESIntUnregister(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
|
|
//
|
|
// Disable the interrupt.
|
|
//
|
|
IntDisable(INT_DES0_TM4C129);
|
|
|
|
//
|
|
// Unregister the interrupt handler.
|
|
//
|
|
IntUnregister(INT_DES0_TM4C129);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables DMA request sources in the DES module.
|
|
//!
|
|
//! \param ui32Base is the base address of the DES module.
|
|
//! \param ui32Flags is a bit mask of the DMA requests to be enabled.
|
|
//!
|
|
//! This function enables DMA request sources in the DES module. The
|
|
//! \e ui32Flags parameter should be the logical OR of any of the following:
|
|
//!
|
|
//! - \b DES_DMA_CONTEXT_IN - Context In
|
|
//! - \b DES_DMA_DATA_OUT - Data Out
|
|
//! - \b DES_DMA_DATA_IN - Data In
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESDMAEnable(uint32_t ui32Base, uint32_t ui32Flags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
ASSERT((ui32Flags & DES_DMA_CONTEXT_IN) ||
|
|
(ui32Flags & DES_DMA_DATA_OUT) ||
|
|
(ui32Flags & DES_DMA_DATA_IN));
|
|
|
|
//
|
|
// Set the data in and data out DMA request enable bits.
|
|
//
|
|
HWREG(ui32Base + DES_O_SYSCONFIG) |= ui32Flags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables DMA request sources in the DES module.
|
|
//!
|
|
//! \param ui32Base is the base address of the DES module.
|
|
//! \param ui32Flags is a bit mask of the DMA requests to be disabled.
|
|
//!
|
|
//! This function disables DMA request sources in the DES module. The
|
|
//! \e ui32Flags parameter should be the logical OR of any of the following:
|
|
//!
|
|
//! - \b DES_DMA_CONTEXT_IN - Context In
|
|
//! - \b DES_DMA_DATA_OUT - Data Out
|
|
//! - \b DES_DMA_DATA_IN - Data In
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
DESDMADisable(uint32_t ui32Base, uint32_t ui32Flags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == DES_BASE);
|
|
ASSERT((ui32Flags & DES_DMA_CONTEXT_IN) ||
|
|
(ui32Flags & DES_DMA_DATA_OUT) ||
|
|
(ui32Flags & DES_DMA_DATA_IN));
|
|
|
|
//
|
|
// Disable the DMA sources.
|
|
//
|
|
HWREG(ui32Base + DES_O_SYSCONFIG) &= ~ui32Flags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Close the Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|