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simplified message handling, switch from XOR checksum to CRC8 with polynomial 0x97.

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0x97 allows for detection of all 1-3 bit errors in a message of up to
119 bytes
(see https://www.faa.gov/aircraft/air_cert/design_approvals/air_software/media/TC-14-49.pdf)
This commit is contained in:
Martin Preuss
2023-04-07 23:22:40 +02:00
parent 4e1f08b567
commit 7eb462173c
33 changed files with 281 additions and 367 deletions
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6
aqhome/msg/msg_node.h
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@@ -16,7 +16,7 @@
#include <gwenhywfar/buffer.h>
#define AQH_MAXMSGSIZE 16
#define AQH_MAXMSGSIZE 24
#define AQH_MSG_OFFS_ALL_DEST_ADDRESS 0
@@ -69,6 +69,10 @@ AQHOME_API int AQH_NodeMsg_IsMsgComplete(const GWEN_MSG *msg);
AQHOME_API int AQH_NodeMsg_IsChecksumValid(const GWEN_MSG *msg);
AQHOME_API int AQH_NodeMsg_AddChecksum(GWEN_MSG *msg);
AQHOME_API uint32_t AQH_NodeMsg_GetUint32At(const GWEN_MSG *msg, int offs, int defaultValue);
AQHOME_API uint16_t AQH_NodeMsg_GetUint16At(const GWEN_MSG *msg, int offs, int defaultValue);
AQHOME_API uint8_t AQH_NodeMsg_GetUint8At(const GWEN_MSG *msg, int offs, int defaultValue);
AQHOME_API void AQH_NodeMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText);
AQHOME_API uint32_t AQH_NodeMsg_GetMsgGroup(uint8_t msgType);