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FIX: @marshmellow found out that the CRC-8/Maxim was not always giving the right checksum. Change POLY from 0x31 -> 0x8C
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parent
118bfa1b1f
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10
common/crc.c
10
common/crc.c
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@ -42,14 +42,12 @@ uint32_t crc_finish(crc_t *crc)
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return ( crc->state ^ crc->final_xor ) & crc->mask;
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}
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int CRC8Maxim(uint8_t *buff, size_t size ) {
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uint32_t CRC8Maxim(uint8_t *buff, size_t size) {
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crc_t crc;
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crc_init(&crc, 8, 0x31, 0x00, 0x00);
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crc_clear(&crc);
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for ( int i=0; i < size; ++i){
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crc_init(&crc, 9, 0x8c, 0x00, 0x00);
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for ( uint8_t i = 0; i < size; ++i){
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crc_update(&crc, buff[i], 8);
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}
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return crc_finish(&crc);
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}
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}
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@ -38,7 +38,7 @@ extern void crc_clear(crc_t *crc);
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extern uint32_t crc_finish(crc_t *crc);
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// Calculate CRC-8/Maxim checksum
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int CRC8Maxim(uint8_t *buff, size_t size );
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uint32_t CRC8Maxim(uint8_t *buff, size_t size );
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/* Static initialization of a crc structure */
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#define CRC_INITIALIZER(_order, _polynom, _initial_value, _final_xor) { \
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