mirror of https://github.com/ArduPilot/ardupilot
AP_GPS: remove dedundant crc32 routine from Nova
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@ -176,8 +176,8 @@ AP_GPS_NOVA::parse(uint8_t temp)
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nova_msg.crc += (uint32_t) (temp << 24);
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nova_msg.nova_state = nova_msg_parser::PREAMBLE1;
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uint32_t crc = CalculateBlockCRC32((uint32_t)nova_msg.header.nova_headeru.headerlength, (uint8_t *)&nova_msg.header.data, (uint32_t)0);
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crc = CalculateBlockCRC32((uint32_t)nova_msg.header.nova_headeru.messagelength, (uint8_t *)&nova_msg.data, crc);
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uint32_t crc = crc_crc32((uint32_t)0, (uint8_t *)&nova_msg.header.data, (uint32_t)nova_msg.header.nova_headeru.headerlength);
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crc = crc_crc32(crc, (uint8_t *)&nova_msg.data, (uint32_t)nova_msg.header.nova_headeru.messagelength);
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if (nova_msg.crc == crc) {
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return process_message();
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@ -293,25 +293,4 @@ AP_GPS_NOVA::process_message(void)
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return false;
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}
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#define CRC32_POLYNOMIAL 0xEDB88320L
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uint32_t AP_GPS_NOVA::CRC32Value(uint32_t icrc)
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{
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int i;
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uint32_t crc = icrc;
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for ( i = 8 ; i > 0; i-- ) {
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if ( crc & 1 )
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crc = ( crc >> 1 ) ^ CRC32_POLYNOMIAL;
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else
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crc >>= 1;
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}
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return crc;
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}
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uint32_t AP_GPS_NOVA::CalculateBlockCRC32(uint32_t length, uint8_t *buffer, uint32_t crc)
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{
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while ( length-- != 0 ) {
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crc = ((crc >> 8) & 0x00FFFFFFL) ^ (CRC32Value(((uint32_t) crc ^ *buffer++) & 0xff));
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}
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return( crc );
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}
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#endif
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@ -39,8 +39,6 @@ private:
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bool parse(uint8_t temp);
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bool process_message();
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uint32_t CRC32Value(uint32_t icrc);
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uint32_t CalculateBlockCRC32(uint32_t length, uint8_t *buffer, uint32_t crc);
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static const uint8_t NOVA_PREAMBLE1 = 0xaa;
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static const uint8_t NOVA_PREAMBLE2 = 0x44;
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