Refactor DMX port config and UART API

Reworked GD32 DMX port handling to use a new `dmx::port::Info` definition with per-port UART metadata, usage flags (TX/RX/TXRX), compile-time UART uniqueness checks, and UART-to-port lookup in IRQ/DMA paths. This removes legacy `kUsartXPort`/`DmxPortToUart` mappings, updates direction/data flow logic for RX-only/TX-only cases, and fixes naming/constant cleanup (`has_continuous_output_`, E1.20 minimum length constants). Also migrated low-level UART helpers to `gd32::` (`UartBegin`, `UartFlagGet`, etc.), updated call sites, and refreshed GD32 identifier mappings in `gd32.json`.

Author: vanvught

.clang-tidy

@@ -6,9 +6,10 @@ Checks: >
   modernize-*,
   readability-*,
   -readability-convert-member-functions-to-static,
+  -readability-use-std-min-max,
   -modernize-avoid-c-arrays,
-  -modernize-loop-convert,
   -modernize-use-trailing-return-type,
+  -modernize-use-std-print,
   misc-unused-include
 
 CheckOptions:
@@ -78,6 +79,22 @@ CheckOptions:
   - key: readability-identifier-naming.TreatAsConstant
     value: 'constexpr'
 
+  - key: readability-identifier-naming.VariableConstantCase
+    value: CamelCase
+  - key: readability-identifier-naming.VariableConstantPrefix
+    value: k
+
+  - key: readability-identifier-naming.TypeTemplateParameterCase
+    value: CamelCase
+
+  - key: readability-identifier-naming.ValueTemplateParameterCase
+    value: CamelCase
+  - key: readability-identifier-naming.ValueTemplateParameterPrefix
+    value: k
+
+  - key: readability-identifier-naming.TemplateTemplateParameterCase
+    value: CamelCase
+
 WarningsAsErrors: ''
 HeaderFilterRegex: '.*'
 FormatStyle: none

common/include/dmx/board_gd32f103rc.h

@@ -29,6 +29,7 @@
 #include <cstdint>
 
 #include "gd32.h" // IWYU pragma: keep
+#include "gd32/dmx_port.h"
 
 #define DMX_MAX_PORTS 1
 
@@ -38,9 +39,7 @@ inline constexpr uint32_t kPorts = DMX_MAX_PORTS;
 } // namespace max
 
 #define DMX_USE_USART2
-inline constexpr auto kUsart2Port = 0;
 
-inline constexpr auto kDirPort0GpioPort = GPIOB;
-inline constexpr auto kDirPort0GpioPin = GPIO_PIN_10;
+inline constexpr port::Info kPort0 = {.uart = gd32::Uart::kUart2, .port = GPIOB, .pin = GPIO_PIN_10, .usage = port::Usage::kTxRx};
 } // namespace dmx::config
 #endif // DMX_BOARD_GD32F103RC_H_

common/include/dmx/board_gd32f107rc.h

@@ -29,6 +29,7 @@
 #include <cstdint>
 
 #include "gd32.h" // IWYU pragma: keep
+#include "gd32/dmx_port.h"
 
 #define DMX_MAX_PORTS 1
 
@@ -38,9 +39,7 @@ inline constexpr uint32_t kPorts = DMX_MAX_PORTS;
 } // namespace max
 
 #define DMX_USE_USART2
-inline constexpr auto kUsart2Port = 0;
 
-inline constexpr auto kDirPort0GpioPort = GPIOB;
-inline constexpr auto kDirPort0GpioPin = GPIO_PIN_10;
+inline constexpr port::Info kPort0 = {.uart = gd32::Uart::kUart2, .port = GPIOB, .pin = GPIO_PIN_10, .usage = port::Usage::kTxRx};
 } // namespace dmx::config
 #endif // DMX_BOARD_GD32F107RC_H_

common/scripts/gd32/gd32.json

@@ -1,16 +1,28 @@
 {
   "0414": {
     "identifiers": {
+      "3RCB": {
+        "series": "GD32F103",
+        "flash": {
+          "256": "GD32F103RCXX"
+        }
+      },
       "3RCF": {
         "series": "GD32F303",
         "flash": {
-          "256": "GD32F303RCXX"
+          "256": "GD32F303XCXX"
         }
       },
-      "3RCB": {
-        "series": "GD32F103",
+      "3VCF": {
+        "series": "GD32F303",
         "flash": {
-          "256": "GD32F103RCXX"
+          "256": "GD32F303XCXX"
+        }
+      },
+      "3VEF": {
+        "series": "GD32F303",
+        "flash": {
+          "512": "GD32F303XEXX"
         }
       }
     }
@@ -20,13 +32,13 @@
       "7RCB": {
         "series": "GD32F107",
         "flash": {
-          "256": "GD32F107RCXX"
+          "256": "GD32F107XCXX"
         }
       },
       "7RGC": {
         "series": "GD32F207",
         "flash": {
-          "1024": "GD32F207RGXX"
+          "1024": "GD32F207XGXX"
         }
       }
     }
@@ -36,7 +48,7 @@
       "7REE": {
         "series": "GD32F407",
         "flash": {
-          "512": "GD32F407REXX"
+          "512": "GD32F407XEXX"
         }
       },
       "9VIE": {

lib-dmx/include/gd32/dmx.h

@@ -120,7 +120,7 @@ class Dmx {
     uint32_t transmit_length_[dmx::config::max::kPorts];
     uint16_t transmit_slots_{dmx::kChannelsMax};
     dmx::Direction port_direction_[dmx::config::max::kPorts];
-    bool has_continuos_output_{false};
+    bool has_continuous_output_{false};
 
     inline static Dmx* s_this;
 };

lib-dmx/include/gd32/dmx_port.h

@@ -0,0 +1,23 @@
+/**
+ * @file dmx_port.h
+ *
+ */
+
+#ifndef GD32_DMX_PORT_H_
+#define GD32_DMX_PORT_H_
+
+#include <cstdint>
+#include "gd32_uart.h"
+
+namespace dmx::port {
+enum class Usage { kTxRx = 0, kTxOnly = 1, kRxOnly = 2 };
+
+struct Info {
+    gd32::Uart uart;
+    uint32_t port;
+    uint32_t pin;
+    Usage usage;
+};
+} // namespace dmx::port
+
+#endif // GD32_DMX_PORT_H_