请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。
器件型号：CC1312PSIP 工具/软件：
您好、
我相信我已经修复了这个问题,并在 CRC32.c :CRC32_calc ()中发现了一个错误;
该选项在通过内部闪存运行时不执行正确的 CRC。 传感器上 ToAD 过程的第一部分会检查内部闪存的 CRC、以确保其与发送到 ToAD 标头中的 CRC 相匹配。 此时我的代码失败。
这是适用于我的修改后的代码。 我将"offset"更改为不包含在 CRC32_memcpy ()中,但在 解析数据以创建 CRC 时包含在其中。
我可以重写它,这样它将接受 CRC32_memcpy ()的偏移量,否则,如果偏移量大于 CRC 缓冲区中读取的值,它可能会失败。 现在、我添加了一项检查、如果偏移量过大、该检查会返回误差。 功能比较全面。
uint32_t CRC32_calc(uint8_t page, uint32_t pageSize, uint16_t offset, uint32_t len, bool useExtFl)
{
uint8_t pageIdx;
uint8_t pageBeg = page;
uint8_t pageEnd;
uint16_t numBytesInLastPg;
uint32_t temp1 = pageSize, temp2, crc = 0;
uint16_t oset = 0;
uint8_t bufNum;
/* Check for invalid length */
if((len == 0) || (len == 0xFFFFFFFF) ||
(useExtFl == true && len > EFL_FLASH_SIZE) ||
(useExtFl == false && len > (MAX_ONCHIP_FLASH_PAGES*INTFLASH_PAGE_SIZE)) ||
(offset > (CRC32_BUF_SZ - 1 - IMG_DATA_OFFSET)))
{
return crc;
}
/* Read first page of the image into the buffer. */
if(!useExtFl)
{
CRC32_memCpy(crcBuf, (uint8_t *)(page * pageSize) /* + offset */, CRC32_BUF_SZ);
}
else
{
readFlashPg(page, 0, crcBuf, CRC32_BUF_SZ);
}
pageEnd = ((len - 1) / (pageSize) + pageBeg);
/* Determine the number of bytes in the last page */
numBytesInLastPg = ((len - 1) % pageSize) + 1;
crc = 0xFFFFFFFF;
/* Read over image pages. */
for (pageIdx = pageBeg; pageIdx <= pageEnd; pageIdx++)
{
uint8_t numBufInCurPg;
/* Find the number of buffers within this page */
if(pageIdx == pageEnd)
{
/* Number of bytes divided by buf_sz is the number of buffers */
numBufInCurPg = numBytesInLastPg / CRC32_BUF_SZ;
/* Round up a buffer if a partial buffer must be used */
if(numBytesInLastPg % CRC32_BUF_SZ != 0)
{
numBufInCurPg++;
}
}
else
{
/* Note this requires that pageSize is an integer multiple of
CRC32_BUF_SZ */
numBufInCurPg = pageSize / CRC32_BUF_SZ;
}
/* Read over buffers within each page */
for(bufNum = 0; bufNum < numBufInCurPg; bufNum++)
{
/* Find ending offset in bytes last buffer. */
uint16_t osetEnd;
/* Calculate the ending offset for this buffer */
if(bufNum == (numBufInCurPg - 1) && pageIdx == pageEnd)
{
if(numBytesInLastPg % CRC32_BUF_SZ != 0)
{
osetEnd = (numBytesInLastPg % CRC32_BUF_SZ );
}
else
{
osetEnd = CRC32_BUF_SZ;
}
}
else
{
osetEnd = CRC32_BUF_SZ;
}
/* Read over all flash words in a buffer, excluding the CRC section
* of the first page and all bytes after the remainder bytes in the
* last buffer
*/
for (oset = ((pageIdx == pageBeg && bufNum == 0) ? (IMG_DATA_OFFSET + offset): 0);
oset < osetEnd;
oset++)
{
temp1 = (crc >> 8) & 0x00FFFFFFL;
temp2 = CRC32_value(((uint32_t)crc ^ crcBuf[oset]) & 0xFF);
crc = temp1 ^ temp2;
}
/* Read data into the next buffer */
if(!useExtFl)
{
CRC32_memCpy(crcBuf, (uint8_t *)((pageIdx*pageSize) + /*offset + */ ((bufNum + 1)*CRC32_BUF_SZ)),
CRC32_BUF_SZ);
}
else
{
/* Check to see if the next buffer is on the next page */
if(bufNum == (numBufInCurPg - 1))
{
readFlashPg((pageIdx + 1), 0, crcBuf, CRC32_BUF_SZ);
}
else
{
readFlashPg(pageIdx, ((bufNum + 1)*CRC32_BUF_SZ), crcBuf,
CRC32_BUF_SZ);
}
}
} /* for(uint8_t bufNum = 0; bufNum < numBufInCurPg; bufNum++) */
} /* for (uint8_t pageIdx = pageBeg; pageIdx <= pageEnd; pageIdx++) */
/* XOR CRC with all bits on */
crc = crc ^ 0xFFFFFFFF;
return(crc);
}
