2,939
edits
Changes
no edit summary
= CAL0 =
= CAL0 =
This is the raw data stored under the PRODINFO partition. Each block of data is padded to 16 bytes, being the last 2 bytes a CRC16 over said block.
This is the raw data stored under the PRODINFO partition.
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
|}
|}
== Error detection ==
Each block of raw calibration data (with the exception of blocks with SHA256 hashes) is padded to 16 bytes, being the last 2 bytes a CRC-16 over said block.
XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
00 00 00 00 00 00 00 00 00 00 00 00 00 00 YY YY
XX == data
00 == padding
YY == crc
The CRC-16 is generated as follows:
unsigned int crc_16_table[16] = {
0x0000, 0xCC01, 0xD801, 0x1400, 0xF001, 0x3C00, 0x2800, 0xE401,
0xA001, 0x6C00, 0x7800, 0xB401, 0x5000, 0x9C01, 0x8801, 0x4400 };
unsigned short int get_crc_16 (char *p, int n) {
unsigned short int crc = 0x55AA;
int r;
while (n-- > 0) {
r = crc_16_table[crc & 0xF];
crc = (crc >> 4) & 0x0FFF;
crc = crc ^ r ^ crc_16_table[*p & 0xF];
r = crc_16_table[crc & 0xF];
crc = (crc >> 4) & 0x0FFF;
crc = crc ^ r ^ crc_16_table[(*p >> 4) & 0xF];
p++;
}
return(crc);
}