openblt_flash.cpp File Reference

Functions
static void	FlashBufferReset ()
static blt_bool	FlashBufferFlush ()
static blt_bool	FlashBufferedWrite (blt_addr addr, blt_int32u len, blt_int8u *data)
void	FlashInit ()
blt_addr	FlashGetUserProgBaseAddress ()
blt_bool	FlashWrite (blt_addr addr, blt_int32u len, blt_int8u *data)
blt_bool	FlashErase (blt_addr addr, blt_int32u len)
blt_bool	FlashDone ()
blt_bool	FlashWriteChecksum ()
blt_bool	FlashVerifyChecksum ()
blt_bool	isFlashDualBank (void)

Variables
static blt_int8u	flashBuffer [FLASH_ECC_LINE_SIZE]
static blt_addr	flashAddr = 0x0

Function Documentation

FlashBufferedWrite()

static blt_bool FlashBufferedWrite ( blt_addr  addr, blt_int32u  len, blt_int8u *  data  )

static

Definition at line 39 of file openblt_flash.cpp.

{
    while (len) {
        if ((addr & FLASH_WRITE_ADDR_MASK) != flashAddr) {
            // crossing ECC line boundary
            FlashBufferFlush();
 
            flashAddr = addr & FLASH_WRITE_ADDR_MASK;
        }
 
        off_t off = addr - flashAddr;
        size_t chunk = minI(sizeof(flashBuffer) - off, len);
        memcpy(flashBuffer + off, data, chunk);
 
        addr += chunk;
        data += chunk;
        len -= chunk;
    }
 
    return BLT_TRUE;
}

Referenced by FlashWrite().

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FlashBufferFlush()

static blt_bool FlashBufferFlush ( )

static

Definition at line 26 of file openblt_flash.cpp.

{
    if (flashAddr == 0x0) {
        return BLT_TRUE;
    }
 
    int result = intFlashWrite(flashAddr, (const char*)flashBuffer, sizeof(flashBuffer));
 
    FlashBufferReset();
 
    return (result == FLASH_RETURN_SUCCESS) ? BLT_TRUE : BLT_FALSE;
}

Referenced by FlashBufferedWrite(), and FlashDone().

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FlashBufferReset()

static void FlashBufferReset ( )

static

Definition at line 20 of file openblt_flash.cpp.

{
    memset(flashBuffer, 0xff, sizeof(flashBuffer));
    flashAddr = 0;
}

Referenced by FlashBufferFlush(), and FlashInit().

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FlashDone()

blt_bool FlashDone

(

void

)

Definition at line 104 of file openblt_flash.cpp.

                     {
#ifdef STM32H7XX
    FlashBufferFlush();
#endif
    return BLT_TRUE;
}

Referenced by NvmDone().

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FlashErase()

blt_bool FlashErase	(	blt_addr	addr,
		blt_int32u	len
	)

Definition at line 91 of file openblt_flash.cpp.

                                                   {
    // don't allow erasing the bootloader
    if (addr < FlashGetUserProgBaseAddress()) {
        return BLT_FALSE;
    }
 
    if (!intFlashIsErased(addr, len)) {
        return (FLASH_RETURN_SUCCESS == intFlashErase(addr, len)) ? BLT_TRUE : BLT_FALSE;
    }
 
    return BLT_TRUE;
}

Referenced by NvmErase().

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FlashGetUserProgBaseAddress()

blt_addr FlashGetUserProgBaseAddress

(

void

)

Definition at line 70 of file openblt_flash.cpp.

                                       {
#ifdef STM32H7XX
    return FLASH_BASE + 128 * 1024;
#else // not STM32H7
    return FLASH_BASE + 32 * 1024;
#endif
}

Referenced by FlashErase(), FlashVerifyChecksum(), FlashWrite(), and NvmGetUserProgBaseAddress().

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FlashInit()

void FlashInit

(

void

)

Definition at line 63 of file openblt_flash.cpp.

                 {
    // Flash already init by ChibiOS
#ifdef STM32H7XX
    FlashBufferReset();
#endif
}

Referenced by NvmInit().

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FlashVerifyChecksum()

blt_bool FlashVerifyChecksum

(

void

)

Definition at line 115 of file openblt_flash.cpp.

                               {
    // Naive check: if the first block is blank, there's no code there
    if (intFlashIsErased(FlashGetUserProgBaseAddress(), 4)) {
        return BLT_FALSE;
    }
 
    static const size_t checksumOffset = 0x1C;
 
    // Now do the actual CRC check to ensure we didn't get stuck with a half-written firmware image
    uint8_t* start = reinterpret_cast<uint8_t*>(FlashGetUserProgBaseAddress());
 
    size_t imageSize = *reinterpret_cast<size_t*>(start + checksumOffset + 4);
 
    if (imageSize > 1024 * 1024) {
        // impossibly large size, invalid
        return BLT_FALSE;
    }
 
    // part before checksum+size
    uint32_t calcChecksum = crc32(start, checksumOffset);
    // part after checksum+size
    calcChecksum = crc32inc(start + checksumOffset + 4, calcChecksum, imageSize - (checksumOffset + 4));
 
    uint32_t storedChecksum = *reinterpret_cast<uint32_t*>(start + checksumOffset);
 
    return calcChecksum == storedChecksum ? BLT_TRUE : BLT_FALSE;
}

Referenced by NvmVerifyChecksum().

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FlashWrite()

blt_bool FlashWrite	(	blt_addr	addr,
		blt_int32u	len,
		blt_int8u *	data
	)

Definition at line 78 of file openblt_flash.cpp.

                                                                    {
    // don't allow overwriting the bootloader
    if (addr < FlashGetUserProgBaseAddress()) {
        return BLT_FALSE;
    }
 
#ifdef STM32H7XX
    return FlashBufferedWrite(addr, len, data);
#else // not STM32H7
    return (FLASH_RETURN_SUCCESS == intFlashWrite(addr, (const char*)data, len)) ? BLT_TRUE : BLT_FALSE;
#endif
}

Referenced by NvmWrite().

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FlashWriteChecksum()

blt_bool FlashWriteChecksum

(

void

)

Definition at line 111 of file openblt_flash.cpp.

                              {
    return BLT_TRUE;
}

Referenced by NvmDone().

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isFlashDualBank()

blt_bool isFlashDualBank

(

void

)

Definition at line 143 of file openblt_flash.cpp.

                               {
#ifdef STM32F7XX
    // cleared bit indicates dual bank
    return (FLASH->OPTCR & FLASH_OPTCR_nDBANK) == 0 ? BLT_TRUE : BLT_FALSE;
#else
    return BLT_TRUE;
#endif
}

Variable Documentation

flashAddr

blt_addr flashAddr = 0x0

static

Definition at line 15 of file openblt_flash.cpp.

Referenced by FlashBufferedWrite(), FlashBufferFlush(), and FlashBufferReset().

flashBuffer

blt_int8u flashBuffer[FLASH_ECC_LINE_SIZE]

static

Definition at line 14 of file openblt_flash.cpp.

Referenced by FlashBufferedWrite(), FlashBufferFlush(), and FlashBufferReset().

Go to the source code of this file.