aeha_protocol.cpp

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#include "aeha_protocol.h"
#include "esphome/core/hal.h"
#include "esphome/core/log.h"
#include <cinttypes>
 
namespace esphome::remote_base {
 
ESPHOME_LOG_TAG(TAG, "remote.aeha");
 
static constexpr uint16_t BITWISE = 425;
static constexpr uint16_t HEADER_HIGH_US = BITWISE * 8;
static constexpr uint16_t HEADER_LOW_US = BITWISE * 4;
static constexpr uint16_t BIT_HIGH_US = BITWISE;
static constexpr uint16_t BIT_ONE_LOW_US = BITWISE * 3;
static constexpr uint16_t BIT_ZERO_LOW_US = BITWISE;
static constexpr uint16_t TRAILER = BITWISE;
 
void AEHAProtocol::encode(RemoteTransmitData *dst, uint16_t address, const uint8_t *data, size_t len) {
  dst->reserve(2 + 32 + (len * 2) + 1);
 
  dst->item(HEADER_HIGH_US, HEADER_LOW_US);
 
  for (uint16_t mask = 1 << 15; mask != 0; mask >>= 1) {
    if (address & mask) {
      dst->item(BIT_HIGH_US, BIT_ONE_LOW_US);
    } else {
      dst->item(BIT_HIGH_US, BIT_ZERO_LOW_US);
    }
  }
 
  for (size_t i = 0; i < len; i++) {
    const uint8_t bit = progmem_read_byte(data + i);
    for (uint8_t mask = 1 << 7; mask != 0; mask >>= 1) {
      if (bit & mask) {
        dst->item(BIT_HIGH_US, BIT_ONE_LOW_US);
      } else {
        dst->item(BIT_HIGH_US, BIT_ZERO_LOW_US);
      }
    }
  }
 
  dst->mark(TRAILER);
}
optional<AEHAData> AEHAProtocol::decode(RemoteReceiveData src) {
  AEHAData out{
      .address = 0,
      .data = {},
  };
  if (!src.expect_item(HEADER_HIGH_US, HEADER_LOW_US))
    return {};
 
  for (uint16_t mask = 1 << 15; mask != 0; mask >>= 1) {
    if (src.expect_item(BIT_HIGH_US, BIT_ONE_LOW_US)) {
      out.address |= mask;
    } else if (src.expect_item(BIT_HIGH_US, BIT_ZERO_LOW_US)) {
      out.address &= ~mask;
    } else {
      return {};
    }
  }
 
  for (uint8_t pos = 0; pos < 35; pos++) {
    uint8_t data = 0;
    for (uint8_t mask = 1 << 7; mask != 0; mask >>= 1) {
      if (src.expect_item(BIT_HIGH_US, BIT_ONE_LOW_US)) {
        data |= mask;
      } else if (src.expect_item(BIT_HIGH_US, BIT_ZERO_LOW_US)) {
        data &= ~mask;
      } else if (pos > 1 && src.expect_mark(TRAILER)) {
        return out;
      } else {
        return {};
      }
    }
 
    out.data.push_back(data);
  }
 
  if (src.expect_mark(TRAILER)) {
    return out;
  }
 
  return {};
}
 
std::string AEHAProtocol::format_data_(const std::vector<uint8_t> &data) {
  std::string out;
  for (uint8_t byte : data) {
    char buf[8];  // "0x%02X," = 5 chars + null + margin
    snprintf(buf, sizeof(buf), "0x%02X,", byte);
    out += buf;
  }
  out.pop_back();
  return out;
}
 
void AEHAProtocol::dump(const AEHAData &data) {
  auto data_str = format_data_(data.data);
  ESP_LOGI(TAG, "Received AEHA: address=0x%04X, data=[%s]", data.address, data_str.c_str());
}
 
}  // namespace esphome::remote_base