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micropython/ports/cc3200/hal/des.c

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27 KiB
C
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cc3200: Update HAL to SDK release version 1.1.0.
2015-03-15 09:05:15 +00:00
//*****************************************************************************
//
// des.c
//
// Driver for the DES data transformation.
//
// 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 DES_Data_Encryption_Standard_api
//! @{
//
//*****************************************************************************
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_des.h"
#include "inc/hw_dthe.h"
#include "inc/hw_ints.h"
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "debug.h"
#include "des.h"
#include "interrupt.h"
//*****************************************************************************
//
//! Configures the DES module for operation.
//!
//! \param ui32Base is the base address of the DES module.
//! \param ui32Config is the configuration of the DES module.
//!
//! This function configures the DES module for operation.
//!
//! The \e ui32Config parameter is a bit-wise OR of a number of configuration
//! flags. The valid flags are grouped below based on their function.
//!
//! The direction of the operation is specified with one of the following two
//! flags. Only one is permitted.
//!
//! - \b DES_CFG_DIR_ENCRYPT - Encryption
//! - \b DES_CFG_DIR_DECRYPT - Decryption
//!
//! The operational mode of the DES engine is specified with one of the
//! following flags. Only one is permitted.
//!
//! - \b DES_CFG_MODE_ECB - Electronic Codebook Mode
//! - \b DES_CFG_MODE_CBC - Cipher-Block Chaining Mode
//! - \b DES_CFG_MODE_CFB - Cipher Feedback Mode
//!
//! The selection of single DES or triple DES is specified with one of the
//! following two flags. Only one is permitted.
//!
//! - \b DES_CFG_SINGLE - Single DES
//! - \b DES_CFG_TRIPLE - Triple DES
//!
//! \return None.
//
//*****************************************************************************
void
DESConfigSet(uint32_t ui32Base, uint32_t ui32Config)
{
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
//
// Backup the save context field.
//
ui32Config |= (HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_CONTEXT);
//
// Write the control register.
//
HWREG(ui32Base + DES_O_CTRL) = ui32Config;
}
//*****************************************************************************
//
//! Sets the key used for DES operations.
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8Key is a pointer to an array that holds the key
//!
//! This function sets the key used for DES operations.
//!
//! \e pui8Key should be 64 bits long (2 words) if single DES is being used or
//! 192 bits (6 words) if triple DES is being used.
//!
//! \return None.
//
//*****************************************************************************
void
DESKeySet(uint32_t ui32Base, uint8_t *pui8Key)
{
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
//
// Write the first part of the key.
//
HWREG(ui32Base + DES_O_KEY1_L) = * ((uint32_t *)(pui8Key + 0));
HWREG(ui32Base + DES_O_KEY1_H) = * ((uint32_t *)(pui8Key + 4));
//
// If we are performing triple DES, then write the key registers for
// the second and third rounds.
//
if(HWREG(ui32Base + DES_O_CTRL) & DES_CFG_TRIPLE)
{
HWREG(ui32Base + DES_O_KEY2_L) = * ((uint32_t *)(pui8Key + 8));
HWREG(ui32Base + DES_O_KEY2_H) = * ((uint32_t *)(pui8Key + 12));
HWREG(ui32Base + DES_O_KEY3_L) = * ((uint32_t *)(pui8Key + 16));
HWREG(ui32Base + DES_O_KEY3_H) = * ((uint32_t *)(pui8Key + 20));
}
}
//*****************************************************************************
//
//! Sets the initialization vector in the DES module.
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8IVdata is a pointer to an array of 64 bits (2 words) of data to
//! be written into the initialization vectors registers.
//!
//! This function sets the initialization vector in the DES module. It returns
//! true if the registers were successfully written. If the context registers
//! cannot be written at the time the function was called, then false is
//! returned.
//!
//! \return True or false.
//
//*****************************************************************************
bool
DESIVSet(uint32_t ui32Base, uint8_t *pui8IVdata)
{
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
//
// Check to see if context registers can be overwritten. If not, return
// false.
//
if((HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_CONTEXT) == 0)
{
return(false);
}
//
// Write the initialization vector registers.
//
HWREG(ui32Base + DES_O_IV_L) = *((uint32_t *) (pui8IVdata + 0));
HWREG(ui32Base + DES_O_IV_H) = *((uint32_t *) (pui8IVdata + 4));
//
// Return true to indicate the write was successful.
//
return(true);
}
//*****************************************************************************
//
//! Sets the crytographic data length in the DES module.
//!
//! \param ui32Base is the base address of the DES module.
//! \param ui32Length is the length of the data in bytes.
//!
//! This function writes the cryptographic data length into the DES module.
//! When this register is written, the engine is triggersed to start using
//! this context.
//!
//! \note Data lengths up to (2^32 - 1) bytes are allowed.
//!
//! \return None.
//
//*****************************************************************************
void
DESDataLengthSet(uint32_t ui32Base, uint32_t ui32Length)
{
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
//
// Write the length register.
//
HWREG(ui32Base + DES_O_LENGTH) = ui32Length;
}
//*****************************************************************************
//
//! Reads plaintext/ciphertext from data registers without blocking
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8Dest is a pointer to an array of 2 words.
//! \param ui8Length the length can be from 1 to 8
//!
//! This function returns true if the data was ready when the function was
//! called. If the data was not ready, false is returned.
//!
//! \return True or false.
//
//*****************************************************************************
bool
DESDataReadNonBlocking(uint32_t ui32Base, uint8_t *pui8Dest, uint8_t ui8Length)
{
volatile uint32_t pui32Dest[2];
uint8_t ui8BytCnt;
uint8_t *pui8DestTemp;
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
if((ui8Length == 0)||(ui8Length>8))
{
return(false);
}
//
// Check to see if the data is ready to be read.
//
if((DES_CTRL_OUTPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
{
return(false);
}
//
// Read two words of data from the data registers.
//
pui32Dest[0] = HWREG(DES_BASE + DES_O_DATA_L);
pui32Dest[1] = HWREG(DES_BASE + DES_O_DATA_H);
//
//Copy the data to a block memory
//
pui8DestTemp = (uint8_t *)pui32Dest;
for(ui8BytCnt = 0; ui8BytCnt < ui8Length ; ui8BytCnt++)
{
*(pui8Dest+ui8BytCnt) = *(pui8DestTemp+ui8BytCnt);
}
//
// Return true to indicate a successful write.
//
return(true);
}
//*****************************************************************************
//
//! Reads plaintext/ciphertext from data registers with blocking.
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8Dest is a pointer to an array of bytes.
//! \param ui8Length the length can be from 1 to 8
//!
//! This function waits until the DES module is finished and encrypted or
//! decrypted data is ready. The output data is then stored in the pui8Dest
//! array.
//!
//! \return None
//
//*****************************************************************************
void
DESDataRead(uint32_t ui32Base, uint8_t *pui8Dest, uint8_t ui8Length)
{
volatile uint32_t pui32Dest[2];
uint8_t ui8BytCnt;
uint8_t *pui8DestTemp;
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
if((ui8Length == 0)||(ui8Length>8))
{
return;
}
//
// Wait for data output to be ready.
//
while((HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_OUTPUT_READY) == 0)
{
}
//
// Read two words of data from the data registers.
//
pui32Dest[0] = HWREG(DES_BASE + DES_O_DATA_L);
pui32Dest[1] = HWREG(DES_BASE + DES_O_DATA_H);
//
//Copy the data to a block memory
//
pui8DestTemp = (uint8_t *)pui32Dest;
for(ui8BytCnt = 0; ui8BytCnt < ui8Length ; ui8BytCnt++)
{
*(pui8Dest+ui8BytCnt) = *(pui8DestTemp+ui8BytCnt);
}
}
//*****************************************************************************
//
//! Writes plaintext/ciphertext to data registers without blocking
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8Src is a pointer to an array of 2 words.
//! \param ui8Length the length can be from 1 to 8
//!
//! This function returns false if the DES module is not ready to accept
//! data. It returns true if the data was written successfully.
//!
//! \return true or false.
//
//*****************************************************************************
bool
DESDataWriteNonBlocking(uint32_t ui32Base, uint8_t *pui8Src, uint8_t ui8Length)
{
volatile uint32_t pui32Src[2]={0,0};
uint8_t ui8BytCnt;
uint8_t *pui8SrcTemp;
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
if((ui8Length == 0)||(ui8Length>8))
{
return(false);
}
//
// Check if the DES module is ready to encrypt or decrypt data. If it
// is not, return false.
//
if(!(DES_CTRL_INPUT_READY & (HWREG(ui32Base + DES_O_CTRL))))
{
return(false);
}
//
// Copy the data to a block memory
//
pui8SrcTemp = (uint8_t *)pui32Src;
for(ui8BytCnt = 0; ui8BytCnt < ui8Length ; ui8BytCnt++)
{
*(pui8SrcTemp+ui8BytCnt) = *(pui8Src+ui8BytCnt);
}
//
// Write the data.
//
HWREG(DES_BASE + DES_O_DATA_L) = pui32Src[0];
HWREG(DES_BASE + DES_O_DATA_H) = pui32Src[1];
//
// Return true to indicate a successful write.
//
return(true);
}
//*****************************************************************************
//
//! Writes plaintext/ciphertext to data registers without blocking
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8Src is a pointer to an array of bytes.
//! \param ui8Length the length can be from 1 to 8
//!
//! This function waits until the DES module is ready before writing the
//! data contained in the pui8Src array.
//!
//! \return None.
//
//*****************************************************************************
void
DESDataWrite(uint32_t ui32Base, uint8_t *pui8Src, uint8_t ui8Length)
{
volatile uint32_t pui32Src[2]={0,0};
uint8_t ui8BytCnt;
uint8_t *pui8SrcTemp;
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
if((ui8Length == 0)||(ui8Length>8))
{
return;
}
//
// Wait for the input ready bit to go high.
//
while(((HWREG(ui32Base + DES_O_CTRL) & DES_CTRL_INPUT_READY)) == 0)
{
}
//
//Copy the data to a block memory
//
pui8SrcTemp = (uint8_t *)pui32Src;
for(ui8BytCnt = 0; ui8BytCnt < ui8Length ; ui8BytCnt++)
{
*(pui8SrcTemp+ui8BytCnt) = *(pui8Src+ui8BytCnt);
}
//
// Write the data.
//
HWREG(DES_BASE + DES_O_DATA_L) = pui32Src[0];
HWREG(DES_BASE + DES_O_DATA_H) = pui32Src[1];
}
//*****************************************************************************
//
//! Processes blocks of data through the DES module.
//!
//! \param ui32Base is the base address of the DES module.
//! \param pui8Src is a pointer to an array of words that contains the
//! source data for processing.
//! \param pui8Dest is a pointer to an array of words consisting of the
//! processed data.
//! \param ui32Length is the length of the cryptographic data in bytes.
//! It must be a multiple of eight.
//!
//! This function takes the data contained in the pui8Src array and processes
//! it using the DES engine. The resulting data is stored in the
//! pui8Dest array. The function blocks until all of the data has been
//! processed. If processing is successful, the function returns true.
//!
//! \note This functions assumes that the DES module has been configured,
//! and initialization values and keys have been written.
//!
//! \return true or false.
//
//*****************************************************************************
bool
DESDataProcess(uint32_t ui32Base, uint8_t *pui8Src, uint8_t *pui8Dest,
uint32_t ui32Length)
{
uint32_t ui32Count, ui32BlkCount, ui32ByteCount;
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
ASSERT((ui32Length % 8) == 0);
//
// Write the length register first. This triggers the engine to start
// using this context.
//
HWREG(ui32Base + DES_O_LENGTH) = ui32Length;
//
// Now loop until the blocks are written.
//
ui32BlkCount = ui32Length/8;
for(ui32Count = 0; ui32Count <ui32BlkCount; ui32Count ++)
{
//
// Check if the input ready is fine
//
while((DES_CTRL_INPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
{
}
//
// Write the data registers.
//
DESDataWriteNonBlocking(ui32Base, pui8Src + ui32Count*8 ,8);
//
// Wait for the output ready
//
while((DES_CTRL_OUTPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
{
}
//
// Read the data registers.
//
DESDataReadNonBlocking(ui32Base, pui8Dest + ui32Count*8 ,8);
}
//
//Now handle the residue bytes
//
ui32ByteCount = ui32Length%8;
if(ui32ByteCount)
{
//
// Check if the input ready is fine
//
while((DES_CTRL_INPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
{
}
//
// Write the data registers.
//
DESDataWriteNonBlocking(ui32Base, pui8Src + (8*ui32BlkCount) ,
ui32ByteCount);
//
// Wait for the output ready
//
while((DES_CTRL_OUTPUT_READY & (HWREG(ui32Base + DES_O_CTRL))) == 0)
{
}
//
// Read the data registers.
//
DESDataReadNonBlocking(ui32Base, pui8Dest + (8*ui32BlkCount) ,
ui32ByteCount);
}
//
// Return true to indicate the process was successful.
//
return(true);
}
//*****************************************************************************
//
//! Returns the current interrupt status of the DES module.
//!
//! \param ui32Base is the base address of the DES module.
//! \param bMasked is \b false if the raw interrupt status is required and
//! \b true if the masked interrupt status is required.
//!
//! This function gets the current interrupt status of the DES module.
//! The value returned is a logical OR of the following values:
//!
//! - \b DES_INT_CONTEXT_IN - Context interrupt
//! - \b DES_INT_DATA_IN - Data input interrupt
//! - \b DES_INT_DATA_OUT_INT - 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 A bit mask of the current interrupt status.
//
//*****************************************************************************
uint32_t
DESIntStatus(uint32_t ui32Base, bool bMasked)
{
uint32_t ui32IntStatus;
//
// Check the arguments.
//
ASSERT(ui32Base == DES_BASE);
//
// Read the status register and return the value.
//
if(bMasked)
{
ui32IntStatus = HWREG(ui32Base + DES_O_IRQSTATUS);
ui32IntStatus &= HWREG(ui32Base + DES_O_IRQENABLE);
ui32IntStatus |= ((HWREG(DTHE_BASE + DTHE_O_DES_MIS) & 0x7) << 16);
return(ui32IntStatus);
}
else
{
ui32IntStatus = HWREG(ui32Base + DES_O_IRQSTATUS);
ui32IntStatus |= ((HWREG(DTHE_BASE + DTHE_O_DES_MIS) & 0xD) << 16);
return(ui32IntStatus);
}
}
//*****************************************************************************
//
//! Enables 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 enabled.
//!
//! \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
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(DTHE_BASE + DTHE_O_DES_IM) &= ~((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(DTHE_BASE + DTHE_O_AES_IM) |= ((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(DTHE_BASE + DTHE_O_DES_IC) = ((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_DES, pfnHandler);
//
// Enable the interrupt.
//
IntEnable(INT_DES);
}
//*****************************************************************************
//
//! 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_DES);
//
// Unregister the interrupt handler.
//
IntUnregister(INT_DES);
}
//*****************************************************************************
//
//! 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.
//! @}
//
//*****************************************************************************