783 lines
24 KiB
C
783 lines
24 KiB
C
//*****************************************************************************
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//
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// flash.c - Driver for programming the on-chip flash.
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//
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// Copyright (c) 2005-2013 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 1.1 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 flash_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_flash.h"
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#include "inc/hw_ints.h"
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#include "inc/hw_sysctl.h"
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#include "inc/hw_types.h"
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#include "driverlib/debug.h"
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#include "driverlib/flashlib.h"
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#include "driverlib/interrupt.h"
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//*****************************************************************************
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//
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// An array that maps the specified memory bank to the appropriate Flash
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// Memory Protection Program Enable (FMPPE) register.
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//
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//*****************************************************************************
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static const uint32_t g_pui32FMPPERegs[] =
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{
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FLASH_FMPPE0,
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FLASH_FMPPE1,
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FLASH_FMPPE2,
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FLASH_FMPPE3
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};
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//*****************************************************************************
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//
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// An array that maps the specified memory bank to the appropriate Flash
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// Memory Protection Read Enable (FMPRE) register.
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//
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//*****************************************************************************
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static const uint32_t g_pui32FMPRERegs[] =
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{
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FLASH_FMPRE0,
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FLASH_FMPRE1,
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FLASH_FMPRE2,
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FLASH_FMPRE3
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};
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//*****************************************************************************
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//
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//! Erases a block of flash.
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//!
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//! \param ui32Address is the start address of the flash block to be erased.
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//!
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//! This function erases a 1-kB block of the on-chip flash. After erasing,
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//! the block is filled with 0xFF bytes. Read-only and execute-only blocks
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//! cannot be erased.
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//!
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//! This function does not return until the block has been erased.
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//!
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//! \return Returns 0 on success, or -1 if an invalid block address was
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//! specified or the block is write-protected.
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//
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//*****************************************************************************
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int32_t
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FlashLibErase(uint32_t ui32Address)
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{
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//
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// Check the arguments.
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//
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ASSERT(!(ui32Address & (FLASH_ERASE_SIZE - 1)));
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//
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// Clear the flash access and error interrupts.
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//
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HWREG(FLASH_FCMISC) = (FLASH_FCMISC_AMISC | FLASH_FCMISC_VOLTMISC |
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FLASH_FCMISC_ERMISC);
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//
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// Erase the block.
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//
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HWREG(FLASH_FMA) = ui32Address;
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HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_ERASE;
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//
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// Wait until the block has been erased.
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//
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while(HWREG(FLASH_FMC) & FLASH_FMC_ERASE)
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{
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}
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//
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// Return an error if an access violation or erase error occurred.
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//
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if(HWREG(FLASH_FCRIS) & (FLASH_FCRIS_ARIS | FLASH_FCRIS_VOLTRIS |
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FLASH_FCRIS_ERRIS))
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{
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return(-1);
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}
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//
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// Success.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Programs flash.
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//!
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//! \param pui32Data is a pointer to the data to be programmed.
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//! \param ui32Address is the starting address in flash to be programmed. Must
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//! be a multiple of four.
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//! \param ui32Count is the number of bytes to be programmed. Must be a
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//! multiple of four.
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//!
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//! This function programs a sequence of words into the on-chip flash.
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//! Each word in a page of flash can only be programmed one time between an
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//! erase of that page; programming a word multiple times results in an
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//! unpredictable value in that word of flash.
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//!
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//! Because the flash is programmed one word at a time, the starting address
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//! and byte count must both be multiples of four. It is up to the caller to
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//! verify the programmed contents, if such verification is required.
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//!
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//! This function does not return until the data has been programmed.
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//!
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//! \return Returns 0 on success, or -1 if a programming error is encountered.
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//
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//*****************************************************************************
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int32_t
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FlashLibProgram(uint32_t *pui32Data, uint32_t ui32Address, uint32_t ui32Count)
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{
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//
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// Check the arguments.
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//
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ASSERT(!(ui32Address & 3));
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ASSERT(!(ui32Count & 3));
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//
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// Clear the flash access and error interrupts.
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//
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HWREG(FLASH_FCMISC) = (FLASH_FCMISC_AMISC | FLASH_FCMISC_VOLTMISC |
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FLASH_FCMISC_INVDMISC | FLASH_FCMISC_PROGMISC);
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//
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// Loop over the words to be programmed.
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//
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while(ui32Count)
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{
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//
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// Set the address of this block of words.
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//
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HWREG(FLASH_FMA) = ui32Address & ~(0x7f);
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//
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// Loop over the words in this 32-word block.
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//
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while(((ui32Address & 0x7c) || (HWREG(FLASH_FWBVAL) == 0)) &&
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(ui32Count != 0))
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{
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//
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// Write this word into the write buffer.
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//
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HWREG(FLASH_FWBN + (ui32Address & 0x7c)) = *pui32Data++;
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ui32Address += 4;
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ui32Count -= 4;
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}
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//
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// Program the contents of the write buffer into flash.
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//
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HWREG(FLASH_FMC2) = FLASH_FMC2_WRKEY | FLASH_FMC2_WRBUF;
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//
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// Wait until the write buffer has been programmed.
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//
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while(HWREG(FLASH_FMC2) & FLASH_FMC2_WRBUF)
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{
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}
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}
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//
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// Return an error if an access violation occurred.
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//
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if(HWREG(FLASH_FCRIS) & (FLASH_FCRIS_ARIS | FLASH_FCRIS_VOLTRIS |
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FLASH_FCRIS_INVDRIS | FLASH_FCRIS_PROGRIS))
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{
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return(-1);
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}
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//
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// Success.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Gets the protection setting for a block of flash.
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//!
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//! \param ui32Address is the start address of the flash block to be queried.
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//!
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//! This function gets the current protection for the specified 2-kB block
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//! of flash. Each block can be read/write, read-only, or execute-only.
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//! Read/write blocks can be read, executed, erased, and programmed. Read-only
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//! blocks can be read and executed. Execute-only blocks can only be executed;
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//! processor and debugger data reads are not allowed.
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//!
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//! \return Returns the protection setting for this block. See
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//! FlashProtectSet() for possible values.
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//
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//*****************************************************************************
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tFlashProtection
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FlashLibProtectGet(uint32_t ui32Address)
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{
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uint32_t ui32FMPRE, ui32FMPPE;
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uint32_t ui32Bank;
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//
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// Check the argument.
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//
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ASSERT(!(ui32Address & (FLASH_PROTECT_SIZE - 1)));
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//
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// Calculate the Flash Bank from Base Address, and mask off the Bank
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// from ui32Address for subsequent reference.
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//
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ui32Bank = (((ui32Address / FLASH_PROTECT_SIZE) / 32) % 4);
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ui32Address &= ((FLASH_PROTECT_SIZE * 32) - 1);
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//
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// Read the appropriate flash protection registers for the specified
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// flash bank.
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//
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ui32FMPRE = HWREG(g_pui32FMPRERegs[ui32Bank]);
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ui32FMPPE = HWREG(g_pui32FMPPERegs[ui32Bank]);
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//
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// Check the appropriate protection bits for the block of memory that
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// is specified by the address.
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//
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switch((((ui32FMPRE >> (ui32Address / FLASH_PROTECT_SIZE)) & 0x1) << 1) |
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((ui32FMPPE >> (ui32Address / FLASH_PROTECT_SIZE)) & 0x1))
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{
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//
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// This block is marked as execute only (that is, it can not be erased
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// or programmed, and the only reads allowed are via the instruction
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// fetch interface).
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//
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case 0:
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case 1:
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{
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return(FlashExecuteOnly);
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}
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//
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// This block is marked as read only (that is, it can not be erased or
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// programmed).
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//
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case 2:
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{
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return(FlashReadOnly);
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}
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//
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// This block is read/write; it can be read, erased, and programmed.
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//
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case 3:
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default:
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{
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return(FlashReadWrite);
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}
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}
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}
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//*****************************************************************************
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//
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//! Sets the protection setting for a block of flash.
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//!
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//! \param ui32Address is the start address of the flash block to be protected.
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//! \param eProtect is the protection to be applied to the block. Can be one
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//! of \b FlashReadWrite, \b FlashReadOnly, or \b FlashExecuteOnly.
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//!
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//! This function sets the protection for the specified 2-kB block of
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//! flash. Blocks that are read/write can be made read-only or execute-only.
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//! Blocks that are read-only can be made execute-only. Blocks that are
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//! execute-only cannot have their protection modified. Attempts to make the
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//! block protection less stringent (that is, read-only to read/write)
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//! result in a failure (and are prevented by the hardware).
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//!
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//! Changes to the flash protection are maintained only until the next reset.
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//! This protocol allows the application to be executed in the desired flash
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//! protection environment to check for inappropriate flash access (via the
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//! flash interrupt). To make the flash protection permanent, use the
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//! FlashProtectSave() function.
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//!
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//! \return Returns 0 on success, or -1 if an invalid address or an invalid
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//! protection was specified.
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//
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//*****************************************************************************
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int32_t
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FlashLibProtectSet(uint32_t ui32Address, tFlashProtection eProtect)
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{
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uint32_t ui32ProtectRE, ui32ProtectPE;
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uint32_t ui32Bank;
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//
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// Check the argument.
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//
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ASSERT(!(ui32Address & (FLASH_PROTECT_SIZE - 1)));
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ASSERT((eProtect == FlashReadWrite) || (eProtect == FlashReadOnly) ||
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(eProtect == FlashExecuteOnly));
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//
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// Convert the address into a block number.
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//
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ui32Address /= FLASH_PROTECT_SIZE;
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//
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// ui32Address contains a "raw" block number. Derive the Flash Bank from
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// the "raw" block number, and convert ui32Address to a "relative"
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// block number.
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//
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ui32Bank = ((ui32Address / 32) % 4);
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ui32Address %= 32;
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//
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// Get the current protection for the specified flash bank.
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//
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ui32ProtectRE = HWREG(g_pui32FMPRERegs[ui32Bank]);
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ui32ProtectPE = HWREG(g_pui32FMPPERegs[ui32Bank]);
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//
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// Set the protection based on the requested protection.
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//
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switch(eProtect)
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{
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//
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// Make this block execute only.
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//
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case FlashExecuteOnly:
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{
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//
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// Turn off the read and program bits for this block.
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//
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ui32ProtectRE &= ~(0x1 << ui32Address);
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ui32ProtectPE &= ~(0x1 << ui32Address);
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//
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// We're done handling this protection.
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//
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break;
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}
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//
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// Make this block read only.
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//
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case FlashReadOnly:
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{
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//
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// The block can not be made read only if it is execute only.
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//
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if(((ui32ProtectRE >> ui32Address) & 0x1) != 0x1)
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{
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return(-1);
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}
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//
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// Make this block read only.
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//
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ui32ProtectPE &= ~(0x1 << ui32Address);
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//
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// We're done handling this protection.
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//
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break;
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}
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//
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// Make this block read/write.
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//
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case FlashReadWrite:
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default:
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{
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//
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// The block can not be made read/write if it is not already
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// read/write.
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//
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if((((ui32ProtectRE >> ui32Address) & 0x1) != 0x1) ||
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(((ui32ProtectPE >> ui32Address) & 0x1) != 0x1))
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{
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return(-1);
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}
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//
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// The block is already read/write, so there is nothing to do.
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//
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return(0);
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}
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}
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//
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// Set the new protection for the specified flash bank.
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//
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HWREG(g_pui32FMPRERegs[ui32Bank]) = ui32ProtectRE;
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HWREG(g_pui32FMPPERegs[ui32Bank]) = ui32ProtectPE;
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//
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// Success.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Saves the flash protection settings.
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//!
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//! This function makes the currently programmed flash protection settings
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//! permanent. On some devices, this operation is non-reversible; a chip reset
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//! or power cycle does not change the flash protection.
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//!
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//! This function does not return until the protection has been saved.
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//!
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//! \return Returns 0 on success, or -1 if a hardware error is encountered.
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//
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//*****************************************************************************
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int32_t
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FlashLibProtectSave(void)
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{
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uint32_t ui32Temp;
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//
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// Save the entire bank of 8 flash protection registers.
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//
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for(ui32Temp = 0; ui32Temp < 8; ui32Temp++)
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{
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//
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// Tell the flash controller to write the flash protection register.
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//
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HWREG(FLASH_FMA) = ui32Temp;
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HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;
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//
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// Wait until the write has completed.
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//
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while(HWREG(FLASH_FMC) & FLASH_FMC_COMT)
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{
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}
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}
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//
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// Success.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Gets the user registers.
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//!
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//! \param pui32User0 is a pointer to the location to store USER Register 0.
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//! \param pui32User1 is a pointer to the location to store USER Register 1.
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//!
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//! This function reads the contents of user registers (0 and 1), and
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//! stores them in the specified locations.
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//!
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//! \return Returns 0 on success, or -1 if a hardware error is encountered.
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//
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//*****************************************************************************
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int32_t
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FlashLibUserGet(uint32_t *pui32User0, uint32_t *pui32User1)
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{
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//
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// Verify that the pointers are valid.
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//
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ASSERT(pui32User0 != 0);
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ASSERT(pui32User1 != 0);
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//
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// Get and store the current value of the user registers.
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//
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*pui32User0 = HWREG(FLASH_USERREG0);
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*pui32User1 = HWREG(FLASH_USERREG1);
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//
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// Success.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Sets the user registers.
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//!
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//! \param ui32User0 is the value to store in USER Register 0.
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//! \param ui32User1 is the value to store in USER Register 1.
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//!
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//! This function sets the contents of the user registers (0 and 1) to
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//! the specified values.
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//!
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//! \return Returns 0 on success, or -1 if a hardware error is encountered.
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//
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//*****************************************************************************
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int32_t
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FlashLibUserSet(uint32_t ui32User0, uint32_t ui32User1)
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{
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//
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// Save the new values into the user registers.
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//
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HWREG(FLASH_USERREG0) = ui32User0;
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HWREG(FLASH_USERREG1) = ui32User1;
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//
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// Success.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Saves the user registers.
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//!
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//! This function makes the currently programmed user register settings
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|
//! permanent. On some devices, this operation is non-reversible; a chip reset
|
|
//! or power cycle does not change this setting.
|
|
//!
|
|
//! This function does not return until the protection has been saved.
|
|
//!
|
|
//! \return Returns 0 on success, or -1 if a hardware error is encountered.
|
|
//
|
|
//*****************************************************************************
|
|
int32_t
|
|
FlashLibUserSave(void)
|
|
{
|
|
//
|
|
// Setting the MSB of FMA will trigger a permanent save of a USER
|
|
// register. Bit 0 will indicate User 0 (0) or User 1 (1).
|
|
//
|
|
HWREG(FLASH_FMA) = 0x80000000;
|
|
HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;
|
|
|
|
//
|
|
// Wait until the write has completed.
|
|
//
|
|
while(HWREG(FLASH_FMC) & FLASH_FMC_COMT)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Tell the flash controller to write the USER1 Register.
|
|
//
|
|
HWREG(FLASH_FMA) = 0x80000001;
|
|
HWREG(FLASH_FMC) = FLASH_FMC_WRKEY | FLASH_FMC_COMT;
|
|
|
|
//
|
|
// Wait until the write has completed.
|
|
//
|
|
while(HWREG(FLASH_FMC) & FLASH_FMC_COMT)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Success.
|
|
//
|
|
return(0);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Registers an interrupt handler for the flash interrupt.
|
|
//!
|
|
//! \param pfnHandler is a pointer to the function to be called when the flash
|
|
//! interrupt occurs.
|
|
//!
|
|
//! This function sets the handler to be called when the flash interrupt
|
|
//! occurs. The flash controller can generate an interrupt when an invalid
|
|
//! flash access occurs, such as trying to program or erase a read-only block,
|
|
//! or trying to read from an execute-only block. It can also generate an
|
|
//! interrupt when a program or erase operation has completed. The interrupt
|
|
//! is automatically enabled when the handler is registered.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
FlashLibIntRegister(void (*pfnHandler)(void))
|
|
{
|
|
//
|
|
// Register the interrupt handler, returning an error if an error occurs.
|
|
//
|
|
IntRegister(INT_FLASH_BLIZZARD, pfnHandler);
|
|
|
|
//
|
|
// Enable the flash interrupt.
|
|
//
|
|
IntEnable(INT_FLASH_BLIZZARD);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Unregisters the interrupt handler for the flash interrupt.
|
|
//!
|
|
//! This function clears the handler to be called when the flash interrupt
|
|
//! occurs. This function also masks off the interrupt in the interrupt
|
|
//! controller so that the interrupt handler is no longer called.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
FlashLibIntUnregister(void)
|
|
{
|
|
//
|
|
// Disable the interrupt.
|
|
//
|
|
IntDisable(INT_FLASH_BLIZZARD);
|
|
|
|
//
|
|
// Unregister the interrupt handler.
|
|
//
|
|
IntUnregister(INT_FLASH_BLIZZARD);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables individual flash controller interrupt sources.
|
|
//!
|
|
//! \param ui32IntFlags is a bit mask of the interrupt sources to be enabled.
|
|
//! Can be any of the \b FLASH_INT_PROGRAM or \b FLASH_INT_ACCESS values.
|
|
//!
|
|
//! This function enables the indicated flash controller interrupt sources.
|
|
//! Only the sources that are enabled can be reflected to the processor
|
|
//! interrupt; disabled sources have no effect on the processor.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
FlashLibIntEnable(uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Enable the specified interrupts.
|
|
//
|
|
HWREG(FLASH_FCIM) |= ui32IntFlags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables individual flash controller interrupt sources.
|
|
//!
|
|
//! \param ui32IntFlags is a bit mask of the interrupt sources to be disabled.
|
|
//! Can be any of the \b FLASH_INT_PROGRAM or \b FLASH_INT_ACCESS values.
|
|
//!
|
|
//! This function disables the indicated flash controller interrupt sources.
|
|
//! Only the sources that are enabled can be reflected to the processor
|
|
//! interrupt; disabled sources have no effect on the processor.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
FlashLibIntDisable(uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Disable the specified interrupts.
|
|
//
|
|
HWREG(FLASH_FCIM) &= ~(ui32IntFlags);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the current interrupt status.
|
|
//!
|
|
//! \param bMasked is false if the raw interrupt status is required and true if
|
|
//! the masked interrupt status is required.
|
|
//!
|
|
//! This function returns the interrupt status for the flash controller.
|
|
//! Either the raw interrupt status or the status of interrupts that are
|
|
//! allowed to reflect to the processor can be returned.
|
|
//!
|
|
//! \return The current interrupt status, enumerated as a bit field of
|
|
//! \b FLASH_INT_PROGRAM and \b FLASH_INT_ACCESS.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
FlashLibIntStatus(bool bMasked)
|
|
{
|
|
//
|
|
// Return either the interrupt status or the raw interrupt status as
|
|
// requested.
|
|
//
|
|
if(bMasked)
|
|
{
|
|
return(HWREG(FLASH_FCMISC));
|
|
}
|
|
else
|
|
{
|
|
return(HWREG(FLASH_FCRIS));
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears flash controller interrupt sources.
|
|
//!
|
|
//! \param ui32IntFlags is the bit mask of the interrupt sources to be cleared.
|
|
//! Can be any of the \b FLASH_INT_PROGRAM or \b FLASH_INT_AMISC values.
|
|
//!
|
|
//! The specified flash controller interrupt sources are cleared, so that they
|
|
//! no longer assert. This function must be called in the interrupt handler
|
|
//! to keep the interrupt from being triggered again immediately upon exit.
|
|
//!
|
|
//! \note Because there is a write buffer in the Cortex-M processor, it may
|
|
//! take several clock cycles before the interrupt source is actually cleared.
|
|
//! Therefore, it is recommended that the interrupt source be cleared early in
|
|
//! the interrupt handler (as opposed to the very last action) to avoid
|
|
//! returning from the interrupt handler before the interrupt source is
|
|
//! actually cleared. Failure to do so may result in the interrupt handler
|
|
//! being immediately reentered (because the interrupt controller still sees
|
|
//! the interrupt source asserted).
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
FlashLibIntClear(uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Clear the flash interrupt.
|
|
//
|
|
HWREG(FLASH_FCMISC) = ui32IntFlags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Close the Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|