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28b43a85e1
* Update crc.c crc files from Mecanix * Create crc.h Part of the crc alternative suggested by Mecanix * Update crc.h Wrong cut& paste, sorry * Delete components/asic/crc.h File in wrong directory * Update crc.h * Update TPS546.c Initialize variables so the code can be compiled with -O2 option.
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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#include "crc.h"
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// Poly x⁵ + x² + 1 MSB-first
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uint8_t crc5(uint8_t *data, uint8_t len) {
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uint8_t crc = 0x1F;
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uint8_t bit_counter, byte_counter;
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for (byte_counter = 0; byte_counter < len; byte_counter++) {
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uint8_t byte = data[byte_counter];
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for (bit_counter = 0; bit_counter < 8; bit_counter++) {
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uint8_t bit = (byte >> 7) & 1;
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byte <<= 1;
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uint8_t new_bit = ((crc >> 4) ^ bit) & 1;
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crc = ((crc << 1) | new_bit) ^ (new_bit << 2);
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crc &= 0x1F;
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}
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}
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return crc;
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}
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// with loop unrolling
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uint16_t crc16(uint8_t *data, uint16_t len)
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{
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uint16_t crc = 0;
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while(len >= 4) {
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crc = crc16_table[(crc >> 8) ^ *data++] ^ (crc << 8);
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crc = crc16_table[(crc >> 8) ^ *data++] ^ (crc << 8);
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crc = crc16_table[(crc >> 8) ^ *data++] ^ (crc << 8);
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crc = crc16_table[(crc >> 8) ^ *data++] ^ (crc << 8);
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len -= 4;
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}
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while(len--) {
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crc = crc16_table[(crc >> 8) ^ *data++] ^ (crc << 8);
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}
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return crc;
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}
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uint16_t crc16_false(uint8_t *data, uint16_t len)
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{
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uint16_t crc = 0xFFFF;
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while(len--) {
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crc = crc16_table[(crc >> 8) ^ *data++] ^ (crc << 8);
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}
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return crc;
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}
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