dali_cpp/README.md

DALI ESP-IDF Component

A lightweight C++ implementation of the DALI stack used in lib/dali/*.dart for gateway type 1 (USB UART) traffic. The component mirrors Dart method names so it can be used as an embedded replacement target.

Quick Start

1. Add the component to your ESP-IDF project (e.g., via EXTRA_COMPONENT_DIRS).
2. Provide UART callbacks when constructing DaliComm:

DaliComm comm(
    /* send */ [](const uint8_t* data, size_t len) {
      // write bytes to the gateway UART
      return my_uart_write(data, len) == ESP_OK;
    },
    /* read (optional) */ [](size_t len, uint32_t timeoutMs) -> std::vector<uint8_t> {
      return my_uart_read(len, timeoutMs);
    },
    /* transact */ [](const uint8_t* data, size_t len) -> std::vector<uint8_t> {
      my_uart_write(data, len);
      return my_uart_read_response(); // should return the raw gateway reply
    });
Dali dali(comm);

3. Use the API just like the Dart version:

dali.base.setBright(5, 200);         // direct arc power control
dali.base.off(5);
dali.base.dtSelect(8);
dali.dt8.setColorTemperature(5, 4000); // Kelvin
std::vector<int> rgb = dali.dt8.getColourRGB(5);

Behaviour Parity

• Frame formats match the Dart implementation: [0x10, addr, cmd] (send), [0x11, addr, cmd] (extended), [0x12, addr, cmd] (query with [0xFF, data] response).
• Address encoding matches Dart helpers: dec*2 for direct arc, dec*2+1 for command/query addresses.
• Colour conversion utilities (rgb2xy, xy2rgb, XYZ/LAB helpers) are ported from lib/dali/color.dart.
• Public APIs from base.dart, dt8.dart, dt1.dart, addr.dart, and decode.dart are exposed with matching method names.
• App-side model parity modules are included for device.dart, sequence.dart, and sequence_store.dart via device.hpp, sequence.hpp, and sequence_store.hpp.
• Utility APIs from errors.dart, log.dart, query_scheduler.dart, and bus_monitor.dart are available as embedded-friendly C++ headers.

Notes

• Optional query support: provide a transact callback that returns the gateway reply; otherwise, query methods return std::nullopt.
• Dali facade in include/dali.hpp mirrors lib/dali/dali.dart and wires base, decode, dt1, dt8, and addr together.
• The t, d, and g parameters in Dart are not required here; timing/gateway selection is driven by your callbacks.