4.1 Format of CSEQ Request (Host –> BM78)
The host MCU sends the CSEQ Request. The CSEQ payload includes the OPCODE, parameter and Cyclic Redundancy Check (CRC) fields. Any 0x3C byte in the payload must escape with a 0x3C byte, so that the 0x3C 0x3C sequence replaces the original 0x3C. Calculate the CRC against the raw data of the OPCODE and CSEQ parameter without escaping with 0x3C.
|
CSEQ_DEL (Delimiter) |
CSEQ_BEGIN |
CSEQ_ OPCODE |
CSEQ Parameter |
CRC |
CSEQ_DEL (Delimiter) |
CSEQ_END | |
|---|---|---|---|---|---|---|---|
| Packet Indicator | CSEQ Payload | Packet End | |||||
|
Byte Number |
0 |
1 |
2 |
3-N |
(N+1) to (N+2) |
N+3 |
N+4 |
|
Size (bytes) |
1 |
1 |
1 |
3-N |
2 |
1 |
1 |
|
Value |
0x3C |
0x66 |
0xXX |
0xXXXXXX |
0xXXXX |
0x3C |
0x5A |