Move serialnumber; remove lib-hal console

Consolidate serial number code into lib-gd32 and remove legacy lib-hal console implementations.

- Renamed/moved hal_serialnumber.{h,cpp} -> lib-gd32/include/serialnumber.h and lib-gd32/src/serialnumber.cpp; updated header guard, file comments, include path, constexpr kSnSize, and removed the hal namespace. Copyright years updated.
- Updated board headers (bw_opidmx4.h, dmx4.h) to check CONFIG_CLIB_USE_NULL instead of CONSOLE_NULL (macro name change).
- Deleted multiple lib-hal console sources and headers (console.h, console_i2c.h, console_null.h, console_uart0.h and implementations under lib-hal/console/{i2c,null,uart0}), removing the bundled console backends.
- Removed an unnecessary #include <cstdint> from lib-hal/include/gd32/hal.h.

This is a cleanup/consolidation change; note the macro rename (CONSOLE_NULL -> CONFIG_CLIB_USE_NULL) and relocation of serialnumber files may require updating include paths or build configuration.

Author: vanvught

lib-gd32/include/board/bw_opidmx4.h

@@ -34,7 +34,7 @@
 # error This file should be included later
 #endif
 
-#if !(defined(CONSOLE_I2C) || defined(CONSOLE_NULL) || defined(CONFIG_USE_SOFTUART0))
+#if !(defined(CONSOLE_I2C) || defined(CONFIG_CLIB_USE_NULL) || defined(CONFIG_USE_SOFTUART0))
 # error USART0 is used for console
 #endif
 

lib-gd32/include/board/dmx4.h

@@ -34,7 +34,7 @@
 # error This file should be included later
 #endif
 
-#if !(defined(CONSOLE_I2C) || defined(CONSOLE_NULL) || defined(CONFIG_USE_SOFTUART0))
+#if !(defined(CONSOLE_I2C) || defined(CONFIG_CLIB_USE_NULL) || defined(CONFIG_USE_SOFTUART0))
 # error USART0 is used for console
 #endif
 

lib-hal/include/hal_serialnumber.h lib-gd32/include/serialnumber.hlib-hal/include/hal_serialnumber.h renamed to lib-gd32/include/serialnumber.h

@@ -1,8 +1,8 @@
 /**
- * @file hal_serialnumber.h
+ * @file serialnumber.h
  *
  */
-/* Copyright (C) 2025 by Arjan van Vught mailto:info@gd32-dmx.org
+/* Copyright (C) 2026 by Arjan van Vught mailto:info@gd32-dmx.org
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -22,16 +22,12 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-
-#ifndef HAL_SERIALNUMBER_H_
-#define HAL_SERIALNUMBER_H_
+#ifndef SERIALNUMBER_H_
+#define SERIALNUMBER_H_
 
 #include <cstdint>
 
-namespace hal
-{
-inline static constexpr uint32_t kSnSize = 4;
+inline constexpr uint32_t kSnSize = 4;
 void SerialNumber(uint8_t sn[kSnSize]);
-} // namespace hal
 
-#endif  // HAL_SERIALNUMBER_H_
+#endif // SERIALNUMBER_H_

lib-hal/src/gd32/hal_serialnumber.cpp lib-gd32/src/serialnumber.cpplib-hal/src/gd32/hal_serialnumber.cpp renamed to lib-gd32/src/serialnumber.cpp

@@ -1,8 +1,8 @@
 /**
- * @file hal_serialnumber.cpp
+ * @file serialnumber.cpp
  *
  */
-/* Copyright (C) 2025 by Arjan van Vught mailto:info@gd32-dmx.org
+/* Copyright (C) 2025-2026 by Arjan van Vught mailto:info@gd32-dmx.org
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -25,9 +25,8 @@
 
 #include <cstdint>
 
-#include "hal_serialnumber.h"
+#include "serialnumber.h"
 
-namespace hal {
 void SerialNumber(uint8_t sn[kSnSize]) {
 #if defined(GD32H7XX)
     const auto kMacaddressHigh = *reinterpret_cast<volatile uint32_t*>(0x1FF0F7E8);
@@ -42,4 +41,3 @@ void SerialNumber(uint8_t sn[kSnSize]) {
     sn[2] = static_cast<uint8_t>((kMacaddressHigh >> 16) & 0xFF);
     sn[3] = static_cast<uint8_t>((kMacaddressHigh >> 24) & 0xFF);
 }
-} // namespace hal