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September 9, 2016 14:54
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SpaceWire-RMAP CRC calculation example
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#include <iostream> | |
#include <vector> | |
static const uint8_t RMAP_CRC_TABLE[] = { | |
0x00, 0x91, 0xe3, 0x72, 0x07, 0x96, 0xe4, 0x75, // 0 | |
0x0e, 0x9f, 0xed, 0x7c, 0x09, 0x98, 0xea, 0x7b, // 1 | |
0x1c, 0x8d, 0xff, 0x6e, 0x1b, 0x8a, 0xf8, 0x69, // 2 | |
0x12, 0x83, 0xf1, 0x60, 0x15, 0x84, 0xf6, 0x67, // 3 | |
0x38, 0xa9, 0xdb, 0x4a, 0x3f, 0xae, 0xdc, 0x4d, // 4 | |
0x36, 0xa7, 0xd5, 0x44, 0x31, 0xa0, 0xd2, 0x43, // 5 | |
0x24, 0xb5, 0xc7, 0x56, 0x23, 0xb2, 0xc0, 0x51, // 6 | |
0x2a, 0xbb, 0xc9, 0x58, 0x2d, 0xbc, 0xce, 0x5f, // 7 | |
0x70, 0xe1, 0x93, 0x02, 0x77, 0xe6, 0x94, 0x05, // 8 | |
0x7e, 0xef, 0x9d, 0x0c, 0x79, 0xe8, 0x9a, 0x0b, // 9 | |
0x6c, 0xfd, 0x8f, 0x1e, 0x6b, 0xfa, 0x88, 0x19, // 10 | |
0x62, 0xf3, 0x81, 0x10, 0x65, 0xf4, 0x86, 0x17, // 11 | |
0x48, 0xd9, 0xab, 0x3a, 0x4f, 0xde, 0xac, 0x3d, // 12 | |
0x46, 0xd7, 0xa5, 0x34, 0x41, 0xd0, 0xa2, 0x33, // 13 | |
0x54, 0xc5, 0xb7, 0x26, 0x53, 0xc2, 0xb0, 0x21, // 14 | |
0x5a, 0xcb, 0xb9, 0x28, 0x5d, 0xcc, 0xbe, 0x2f, // 15 | |
0xe0, 0x71, 0x03, 0x92, 0xe7, 0x76, 0x04, 0x95, // 16 | |
0xee, 0x7f, 0x0d, 0x9c, 0xe9, 0x78, 0x0a, 0x9b, // 17 | |
0xfc, 0x6d, 0x1f, 0x8e, 0xfb, 0x6a, 0x18, 0x89, // 18 | |
0xf2, 0x63, 0x11, 0x80, 0xf5, 0x64, 0x16, 0x87, // 19 | |
0xd8, 0x49, 0x3b, 0xaa, 0xdf, 0x4e, 0x3c, 0xad, // 20 | |
0xd6, 0x47, 0x35, 0xa4, 0xd1, 0x40, 0x32, 0xa3, // 21 | |
0xc4, 0x55, 0x27, 0xb6, 0xc3, 0x52, 0x20, 0xb1, // 22 | |
0xca, 0x5b, 0x29, 0xb8, 0xcd, 0x5c, 0x2e, 0xbf, // 23 | |
0x90, 0x01, 0x73, 0xe2, 0x97, 0x06, 0x74, 0xe5, // 24 | |
0x9e, 0x0f, 0x7d, 0xec, 0x99, 0x08, 0x7a, 0xeb, // 25 | |
0x8c, 0x1d, 0x6f, 0xfe, 0x8b, 0x1a, 0x68, 0xf9, // 26 | |
0x82, 0x13, 0x61, 0xf0, 0x85, 0x14, 0x66, 0xf7, // 27 | |
0xa8, 0x39, 0x4b, 0xda, 0xaf, 0x3e, 0x4c, 0xdd, // 28 | |
0xa6, 0x37, 0x45, 0xd4, 0xa1, 0x30, 0x42, 0xd3, // 29 | |
0xb4, 0x25, 0x57, 0xc6, 0xb3, 0x22, 0x50, 0xc1, // 30 | |
0xba, 0x2b, 0x59, 0xc8, 0xbd, 0x2c, 0x5e, 0xcf // 31 | |
}; | |
uint8_t calculate_crc(const std::vector<uint8_t>& data) { | |
uint8_t crc = 0x00; | |
const size_t length = data.size(); | |
for (size_t i = 0; i < length; i++) { | |
const uint8_t crc_new = RMAP_CRC_TABLE[(crc ^ data[i]) & 0xff]; | |
crc = crc_new; | |
} | |
return crc; | |
} | |
int main(int argc, char* argv[]) { | |
// Command | |
std::vector<uint8_t> command_packet = {0xfe, 0x01, 0x7c, 0x00, 0xfe, | |
0x00, 0x00, 0x00, 0x01, 0x01, | |
0x10, 0x04, 0x00, 0x00, 0x02}; | |
printf("CRC = 0x%02x\n", calculate_crc(command_packet)); | |
// Reply | |
std::vector<uint8_t> reply_packet = {0xfe, 0x01, 0x3c, 0x00, | |
0xfe, 0x00, 0x05, 0x2f}; | |
printf("CRC = 0x%02x\n", calculate_crc(reply_packet)); | |
} |
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all: crc_example | |
crc_example: crc_example.cc | |
clang++ -std=c++11 -stdlib=libc++ $^ -o $@ |
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