Matthias
6880a47b46
git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@111 9fe90eed-be63-e94b-8204-d34ff4c2ff93
159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/* ---------------------------------------------------------------------------
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* appImage.c - v0.1 (c) 2008 Micro-key bv
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* ---------------------------------------------------------------------------
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* Micro-key bv
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* Industrieweg 28, 9804 TG Noordhorn
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* Postbus 92, 9800 AB Zuidhorn
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* The Netherlands
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* Tel: +31 594 503020
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* Fax: +31 594 505825
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* Email: support@microkey.nl
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* Web: www.microkey.nl
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* ---------------------------------------------------------------------------
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* Description:
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* ---------------------------------------------------------------------------
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* Version(s): 0.1, Feb 12, 2008, FSc
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* Creation.
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* System include files
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Application include files
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* ---------------------------------------------------------------------------
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*/
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#include "types.h"
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#include "appImage.h"
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#include "LPC23xx.h"
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#include "crc.h"
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#include "IspProtocol.h"
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#include "bootloader.h"
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/* ---------------------------------------------------------------------------
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* Local constant and macro definitions
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* ---------------------------------------------------------------------------
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*/
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typedef void (*t_application_startup)(void);
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#define APPI_FLASH_START_ADDR 0x5000
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#define APPI_FLASH_END_ADDR 0x7E000
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#define APPI_C_ENTRY_OFFS 0x0020
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#define APPI_IMAGE_LENGTH_OFFS 0x0008
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#define APPI_IMAGE_CRC_OFFS 0x000C
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/* ---------------------------------------------------------------------------
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* Global variable definitions
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Local variable definitions
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Local function definitions
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* ---------------------------------------------------------------------------
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*/
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void appiCalculateCrc( UINT32 imageLength, UINT16 *crc );
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/** \brief Checks if the Application image requests a Image update
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*
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* When the application image wants to start an image update, it sets
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* a pattern on a known RAM-location and resets the CPU. Now the bootloader
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* can verify this pattern.
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*
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* \retval TRUE Application did request an update
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* \retval FALSE Application did not request an update
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*/
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BOOLEAN appiApplicationRequestsUpdate()
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{
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if (blGetBootmode() == STAY_IN_BOOTLOADER)
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{
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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/** \brief Checks if a valid Application image.
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*
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* \retval TRUE Flash contains a valid Application image
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* \retval FALSE Flash doesn't contain a valid Application image
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*/
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BOOLEAN appiValidAppImageAvail()
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{
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static UINT32 imageSize = 0;
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static UINT16 recordedCrc = 0;
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UINT8 index;
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static UINT16 calculatedCrc;
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index = APPI_IMAGE_LENGTH_OFFS;
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imageSize = ispGet32bit((UINT8 *)APPI_FLASH_START_ADDR, &index);
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recordedCrc = ispGet16bit((UINT8 *)APPI_FLASH_START_ADDR, &index);
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if ( (imageSize >= 100)
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&& (imageSize <= (APPI_FLASH_START_ADDR - APPI_FLASH_END_ADDR))
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)
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{
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appiCalculateCrc(imageSize, &calculatedCrc);
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if (recordedCrc != calculatedCrc)
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{
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return FALSE;
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}
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else
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{
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return TRUE;
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}
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}
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else
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{
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if (imageSize == 0)
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{
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// escape for debugging
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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}
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/** \brief Jumps to the Application image. Function won't return.
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*/
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void appiJumpToAppImage()
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{
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unsigned int application_start_addr = APPI_FLASH_START_ADDR + APPI_C_ENTRY_OFFS;
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blResetBootmode();
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DISABLE_INTERRUPTS();
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((t_application_startup)application_start_addr)();
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}
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void appiCalculateCrc( UINT32 imageLength, UINT16 *crc )
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{
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UINT8 *image = (UINT8 *)(APPI_FLASH_START_ADDR);
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*crc = 0;
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// Calculate Crc over part before Length & CRC
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*crc = crcCalc(image, APPI_IMAGE_LENGTH_OFFS, *crc);
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// Calculate Crc over part after Length & CRC
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image = (UINT8 *)(APPI_FLASH_START_ADDR + APPI_IMAGE_CRC_OFFS + 4);
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*crc = crcCalc(image, imageLength - (APPI_IMAGE_CRC_OFFS + 4), *crc);
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}
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