CRC
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_SOFTWARETABLE is an array of pointers located at ROM_APITABLE[21].
ROM_Crc16Array is a function pointer located at ROM_SOFTWARETABLE[1].
Parameters:
ui32WordLen is the length of the array in words.
pui32Data is a pointer to the array of words.
Description:
This function is used to calculate a standard CRC-16 cyclical redundancy check on the data
passed to it. The length of the data only matters in terms of the “strength” of the CRC (likelihood
of catching errors). The longer the data, the more likely it will not catch some errors.
Returns:
Returns the calculated CRC-16.
7.2.1.3 ROM_Crc16Array3
Calculates three CRC-16s of an array of words.
Prototype:
void
ROM_Crc16Array3(uint32_t ui32WordLen,
uint32_t
*
pui32Data,
uint16_t
*
pui16Crc3)
ROM Location:
ROM_APITABLE is an array of pointers located at 0x0100.0010.
ROM_SOFTWARETABLE is an array of pointers located at ROM_APITABLE[21].
ROM_Crc16Array3 is a function pointer located at ROM_SOFTWARETABLE[2].
Parameters:
ui32WordLen is the length of the array in words.
pui32Data is a pointer to the array of words.
pui16Crc3 is a pointer to an array into which the three CRC values are to be placed.
Description:
This function is used to calculate three CRC-16s from the same array. This computes the
CRC-16 on all of the bytes (same as ROM_Crc16Array()), on the even bytes, and on the odd
bytes. This calculation of three CRC-16s increases the chance of detecting errors because it
is much harder for a set of errors to end up being correct for all three CRC-16s.
Returns:
None
7.2.1.4 ROM_Crc8CCITT
Calculates the CRC-8-CCITT of an array of bytes.
April 8, 2013 71
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