Initial ESPHome port for Wake Up Light II

patches/apply_uart_patch.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""Apply the Wake Up Light II WBR3 PA13/PA14 UART0 workaround to installed ESPHome.
+
+This is intentionally narrow: it only adds the alternate PA13/PA14 UART0 mapping
+needed by this lamp, then calls LibreTiny Serial0.setPins() before begin().
+"""
+from pathlib import Path
+import shutil
+import sys
+
+try:
+    import esphome
+except ImportError:
+    sys.exit("ERROR: ESPHome is not importable in this Python environment")
+
+p = Path(esphome.__file__).parent / "components" / "uart" / "uart_component_libretiny.cpp"
+if not p.exists():
+    sys.exit(f"ERROR: not found: {p}")
+
+s = p.read_text()
+marker = 'Using alternate UART0 pins RX=PA13 TX=PA14'
+if marker in s:
+    print(f"Already patched: {p}")
+    sys.exit(0)
+
+old_select = '''#if LT_HW_UART0
+  else if ((tx_pin == -1 || tx_pin == PIN_SERIAL0_TX) && (rx_pin == -1 || rx_pin == PIN_SERIAL0_RX) &&
+           !should_fallback_to_software_serial()) {
+    this->serial_ = &Serial0;
+    this->hardware_idx_ = 0;
+  }
+#endif
+'''
+new_select = '''#if LT_HW_UART0
+  else if ((((tx_pin == -1 || tx_pin == PIN_SERIAL0_TX) &&
+             (rx_pin == -1 || rx_pin == PIN_SERIAL0_RX)) ||
+            (tx_pin == 14 && rx_pin == 13)) &&
+           !should_fallback_to_software_serial()) {
+    this->serial_ = &Serial0;
+    this->hardware_idx_ = 0;
+  }
+#endif
+'''
+
+old_begin = '  this->serial_->begin(this->baud_rate_, get_config());\n'
+new_begin = '''  if (this->hardware_idx_ == 0 && tx_pin == 14 && rx_pin == 13) {
+    ESP_LOGI(TAG, "Using alternate UART0 pins RX=PA13 TX=PA14");
+    Serial0.setPins(rx_pin, tx_pin);
+  }
+  this->serial_->begin(this->baud_rate_, get_config());
+'''
+
+if old_select not in s:
+    sys.exit(
+        "ERROR: UART0 selection block not found. ESPHome source has changed; "
+        "do not patch blindly. Compare with ESPHome issue #13596 / PR #13629."
+    )
+if old_begin not in s:
+    sys.exit("ERROR: serial begin() line not found; ESPHome source has changed")
+
+backup = p.with_suffix(p.suffix + ".wake-up-light-backup")
+if not backup.exists():
+    shutil.copy2(p, backup)
+    print(f"Backup: {backup}")
+
+s = s.replace(old_select, new_select, 1)
+s = s.replace(old_begin, new_begin, 1)
+p.write_text(s)
+print(f"Patched: {p}")
+print("Run: esphome clean wake-up-light-ii.yaml && esphome compile wake-up-light-ii.yaml")