cc3200: Add cc3200 port of MicroPython.

The port currently implements support for GPIO, RTC, ExtInt and the WiFi
subsystem. A small file system is available in the serial flash. A
bootloader which makes OTA updates possible, is also part of this initial
implementation.

1 files changed, 887 insertions, 0 deletions

diff --git a/cc3200/hal/des.c b/cc3200/hal/des.c
new file mode 100644
index 000000000..ad8de1cc3
--- /dev/null
+++ b/cc3200/hal/des.c
@@ -0,0 +1,887 @@
+//*****************************************************************************
+//
+//  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 + (ui32Count*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 + (ui32Count*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.
+//! @}
+//
+//*****************************************************************************