Ich stelle hier die CRC Berechnung für den LTC6804 zur Verfügung.
CRC15.c
1 | uint16 Crc15( uint16 u16InCrc, uint8 u8InData )
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2 | {
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3 | uint8 u8Index;
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4 | uint16 u16Data;
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5 | uint16 u16Eor;
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6 |
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7 | u8Index = 8;
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8 | u16Data = u16InCrc ^ (uint16)((uint16)(u8InData) << 7);
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9 |
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10 | do{
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11 | u16Eor = u16Data & 0x4000 ? 0x4599 : 0;
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12 | u16Data = (uint16)(u16Data << 1);
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13 | u16Data ^= u16Eor;
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14 | }while(--u8Index);
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15 |
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16 | return u16Data;
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17 | }
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18 |
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19 | uint16 Crc15Block(uint16 u16Crc, puint8 pu8Data, uint8 u8Length)
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20 | {
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21 | if(u8Length)do{
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22 | u16Crc = Crc15( u16Crc, *pu8Data++ );
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23 | }while(--u8Length);
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24 |
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25 | u16Crc = (u16Crc & 0x7FFF) << 1;
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26 | return u16Crc;
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27 | }
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CRC15.h
1 | #ifndef __CRC15_h
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2 | #define __CRC15_h
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3 |
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4 | #include "SewDTyp.h"
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5 |
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6 | #ifndef CRC15_C
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7 | #define CRC15_EXT extern
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8 | #else
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9 | #define CRC15_EXT
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10 | #endif
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11 |
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12 | #define CRC_INIT 0x0010
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13 | #define CRC_CORRECT 0//CRC_VALUE
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14 |
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15 | CRC15_EXT uint16 Crc15Block( uint16 u16Crc, puint8 pu8Data, uint8 u8Length );
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16 |
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17 | #endif
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