openblt_flash.cpp File Reference

Functions
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)

Function Documentation

FlashDone()

blt_bool FlashDone

(

void

)

Definition at line 45 of file openblt_flash.cpp.

                     {
    return BLT_TRUE;
}

Referenced by NvmDone().

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FlashErase()

blt_bool FlashErase	(	blt_addr	addr,
		blt_int32u	len
	)

Definition at line 32 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 13 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 9 of file openblt_flash.cpp.

                 {
    // Flash already init by ChibiOS
}

Referenced by NvmInit().

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FlashVerifyChecksum()

blt_bool FlashVerifyChecksum

(

void

)

Definition at line 53 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 21 of file openblt_flash.cpp.

                                                                    {
    // don't allow overwriting the bootloader
    if (addr < FlashGetUserProgBaseAddress()) {
        return BLT_FALSE;
    }
 
    return (FLASH_RETURN_SUCCESS == intFlashWrite(addr, (const char*)data, len)) ? BLT_TRUE : BLT_FALSE;
 
    return BLT_TRUE;
}

Referenced by NvmWrite().

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FlashWriteChecksum()

blt_bool FlashWriteChecksum

(

void

)

Definition at line 49 of file openblt_flash.cpp.

                              {
    return BLT_TRUE;
}

Referenced by NvmDone().

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isFlashDualBank()

blt_bool isFlashDualBank

(

void

)

Definition at line 81 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
}

Go to the source code of this file.