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use esphome::crc16

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This commit is contained in:
Jonas Rabenstein 2025-12-23 10:26:24 +01:00
commit 98e5dd0a5c
1 changed files with 12 additions and 29 deletions
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41
components/brmesh/network.cpp
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@ -65,29 +65,15 @@ uint8_t crc(const std::span<uint8_t, size> &bytes, uint8_t init = 0x00) {
return init;
}
uint16_t crc16(uint8_t byte, uint16_t crc) {
crc ^= static_cast<uint16_t>(byte) << 8;
for (int j=0; j<4; ++j) {
uint16_t tmp = crc << 1;
if (crc & 0x8000)
tmp ^= 0x1021;
crc = tmp << 1;
if (tmp & 0x8000)
crc ^= 0x1021;
}
return crc;
}
uint16_t crc16(const std::array<uint8_t, 3> &addr, const std::span<uint8_t> &data, const uint16_t seed = 0xFFFF) {
auto crc = seed;
for (auto it = addr.rbegin(); it != addr.rend(); ++it)
crc = crc16(*it, crc);
for (const auto &byte:data)
crc = crc16(reverse_bits(byte), crc);
return ~reverse_bits(crc);
uint16_t crc16(const std::span<const uint8_t> &data, const uint16_t seed = 0xFFFF) {
return ~esphome::crc16(
data.data(),
data.size(),
seed,
0x1021,
true, // refin
true // refout
);
}
std::span<uint8_t> inner(const std::span<uint8_t> &buffer, Light::Id id, const std::span<uint8_t> &light_data) {
@ -158,7 +144,7 @@ std::span<uint8_t> command(const std::span<uint8_t> &buffer, const Key &key, Lig
}
std::span<uint8_t> payload(const std::span<uint8_t> &buffer, const Key &key, Light::Id id, uint8_t seq, const std::span<uint8_t> &light_data) {
constexpr std::array<uint8_t, 3> ADDRESS = {0xC1, 0xC2, 0xC3};
constexpr std::array<uint8_t, 3> ADDRESS = { 0xC3, 0x43, 0x83 };
constexpr std::array<uint8_t, 3> PREFIX = { 0x71, 0x0F, 0x55 };
const auto prefix = subspan(buffer, 0, PREFIX.size());
@ -188,10 +174,9 @@ std::span<uint8_t> payload(const std::span<uint8_t> &buffer, const Key &key, Lig
std::copy(PREFIX.cbegin(), PREFIX.cend(), prefix.begin());
// copy
std::reverse_copy(ADDRESS.cbegin(), ADDRESS.cend(), address.begin());
std::copy(ADDRESS.cbegin(), ADDRESS.cend(), address.begin());
uint16_t crc_value = crc16(ADDRESS, command);
uint16_t crc_value = crc16(buffer.subspan(prefix.size(), address.size() + command.size()));
crc[0] = crc_value;
crc[1] = crc_value >> 8;
@ -200,8 +185,6 @@ std::span<uint8_t> payload(const std::span<uint8_t> &buffer, const Key &key, Lig
for (auto &byte:prefix)
byte = reverse_bits(byte);
for (auto &byte:address)
byte = reverse_bits(byte);
//ESP_LOGV(TAG, "%c%02hhX: reverse: %s", id.kind(), id.value(),
// format_hex_pretty(&result[0], result.size()).c_str());