OAD

最新推荐文章于 2023-10-21 09:44:41 发布

原创最新推荐文章于 2023-10-21 09:44:41 发布 · 1.8k 阅读

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一.查询版本信息

1.注册imagidentify通知

2.往其中写0x00（基本上是任意值都可以）.

3.设备notify当前image header ：如：0200007c 41414141（版本为A）

image header的格式：

typedef struct {
#if defined FEATURE_OAD_SECURE
// Secure OAD uses the Signature for image validation instead of calculating a CRC, but the use
// of CRC==CRC-Shadow for quick boot-up determination of a validated image is still used.
uint16 crc0; // CRC must not be 0x0000 or 0xFFFF.CRC校验
#endif
uint16 crc1; // CRC-shadow must be 0xFFFF.
// User-defined Image Version Number - default logic uses simple a '!=' comparison to start an OAD.
uint16 ver;//版本
uint16 len; // Image length in 4-byte blocks (i.e. HAL_FLASH_WORD_SIZE blocks).长度
uint8 uid[4]; // User-defined Image Identification bytes.
uint8 res[4]; // Reserved space for future use.
} img_hdr_t;

二.传输过程

1.写新的image 信息到identify，获得版本信息，大小等信息用来确认是否真的需要跟新，以及为下一步和bin文件内容比对校验。

2.将bin文件拆包发送到到block。

3.完成接受之后重启系统

代码分析：

static bStatus_t oadImgIdentifyWrite( uint16 connHandle, uint8 *pValue )
{
img_hdr_t rxHdr;
img_hdr_t ImgHdr;
//低位在前，高位在后。
rxHdr.ver = BUILD_UINT16( pValue[0], pValue[1] );//版本
rxHdr.len = BUILD_UINT16( pValue[2], pValue[3] );//

(void)osal_memcpy(rxHdr.uid, pValue+4, sizeof(rxHdr.uid));

HalFlashRead(OAD_IMG_R_PAGE, OAD_IMG_HDR_OSET, (uint8 *)&ImgHdr, sizeof(img_hdr_t));//读取版本信息

oadBlkTot = rxHdr.len / (OAD_BLOCK_SIZE / HAL_FLASH_WORD_SIZE);//

if ( (OAD_IMG_ID( ImgHdr.ver ) != OAD_IMG_ID( rxHdr.ver )) && // TBD: add customer criteria for initiating OAD here.
//版本信息要不一样
//(rxHdr.ver!=0)&&//jia
(oadBlkTot <= OAD_BLOCK_MAX) &&//7936
//长度小于最大长度
(oadBlkTot != 0) )
//且不为0
{
oadBlkNum = 0;
oadImgBlockReq(connHandle, 0);//请求一个块从0开始，并notify oadBlkNum
}
else
{
oadImgIdentifyReq(connHandle, &ImgHdr);//否则发送当前版本信息
}

return ( SUCCESS );
}

/*********************************************************************
* @fn oadImgBlockWrite
*
* @brief Process the Image Block Write.
*
* @param connHandle - connection message was received on
* @param pValue - pointer to data to be written
*
* @return status
*/
static bStatus_t oadImgBlockWrite( uint16 connHandle, uint8 *pValue )
{
uint16 blkNum = BUILD_UINT16( pValue[0], pValue[1] );

// make sure this is the image we're expecting确定这个image是想要的
if ( blkNum == 0 )
//这个要参考bin文件的格式组成，
/*组成：标记(7)+Image开始地址(1)+Image长度(1)
记录0地址+记录0长+记录0校验和+记录0内容(文件内容)
记录1地址+记录1长+记录1校验和+记录1内容(文件内容)*/
{
img_hdr_t ImgHdr;
uint16 ver = BUILD_UINT16( pValue[6], pValue[7] );//如果是第一个包，那么会包含版本号和长度等信息
uint16 blkTot = BUILD_UINT16( pValue[8], pValue[9] ) / (OAD_BLOCK_SIZE / HAL_FLASH_WORD_SIZE);

HalFlashRead(OAD_IMG_R_PAGE, OAD_IMG_HDR_OSET, (uint8 *)&ImgHdr, sizeof(img_hdr_t));
//以下为比对之前从Img Identify中获取到的内容，若有不相同，则说明信息不对，返回错误
if ( ( oadBlkNum != blkNum ) ||
( oadBlkTot != blkTot ) ||
( OAD_IMG_ID( ImgHdr.ver ) == OAD_IMG_ID( ver ) ) )//版本信息一样
{
return ( ATT_ERR_WRITE_NOT_PERMITTED );
}
}

if (oadBlkNum == blkNum)//之后每次判断传的包数量是否一致
{

//计算方式：page*2048/4 =addr
uint16 addr = oadBlkNum * (OAD_BLOCK_SIZE / HAL_FLASH_WORD_SIZE) +
(OAD_IMG_D_PAGE * OAD_FLASH_PAGE_MULT);
oadBlkNum++;

#if defined FEATURE_OAD_SECURE
if (blkNum == 0)
{
// Stop attack with crc0==crc1 by forcing crc1=0xffff.
pValue[4] = 0xFF;
pValue[5] = 0xFF;
}
#endif

#if defined HAL_IMAGE_B
// Skip the Image-B area which lies between the lower & upper Image-A parts.跳过中间存放imageA 的部分
if (addr >= (OAD_IMG_B_PAGE * OAD_FLASH_PAGE_MULT))
{
addr += OAD_IMG_B_AREA * OAD_FLASH_PAGE_MULT;
}
#endif
if ((addr % OAD_FLASH_PAGE_MULT) == 0)
{
HalFlashErase(addr / OAD_FLASH_PAGE_MULT);
}

HalFlashWrite(addr, pValue+2, (OAD_BLOCK_SIZE / HAL_FLASH_WORD_SIZE));//
}

if (oadBlkNum == oadBlkTot) // If the OAD Image is complete.完成传输
{
#if defined FEATURE_OAD_SECURE
HAL_SYSTEM_RESET(); // Only the secure OAD boot loader has the security key to decrypt.
#else
if (checkDL())//校验
{
#if !defined HAL_IMAGE_A
// The BIM always checks for a valid Image-B before Image-A,
// so Image-A never has to invalidate itself.
uint16 crc[2] = { 0x0000, 0xFFFF };
uint16 addr = OAD_IMG_R_PAGE * OAD_FLASH_PAGE_MULT + OAD_IMG_CRC_OSET / HAL_FLASH_WORD_SIZE;
HalFlashWrite(addr, (uint8 *)crc, 1);
#endif
//HAL_SYSTEM_RESET();重启
}
#endif
}
else // Request the next OAD Image block.
{
oadImgBlockReq(connHandle, oadBlkNum);//调用notify，将oadBlkNum通知上去
}

return ( SUCCESS );
}